Taehyung keens breathily, neck tilting back as he lets Hoseok suck a hickey into the skin above his collarbone, the elder’s fingers tightening around his hips to keep his body steady as he rests his entire weight on shaky knees. They’ll be finger-shaped marks on the skin around his waist later, he doesn’t doubt it, but for now he’s too lost in the sensation of a wet tongue darting across his nipple, teeth coming out to graze that same spot bluntly.
When Hoseok’s mouth starts to trek back up towards the column of his neck, Taehyung allows himself to fall back into the other’s lap, still sitting astride firm thighs, releasing shaky breaths as he feels hands press against his clothed backside, squeezing firmly before a hand comes up to smack lightly. His fingers settle into the hair at the nape of Hoseok’s neck, carding in an upwards motion before tugging at the hair roughly when Hoseok sucks an especially harsh bruise into the skin at the junction between his neck and shoulder.
He can feel heart-shaped lips smile against his skin, before Hoseok’s tongue comes out to lap at the spot gently, little kitten licks making him sigh out in pleasure. The fingers on his butt move upwards as the elder continues tracing the bruise, and blunt nails drag themselves up and down his back making him shiver as he tilts his head back and lets out a soft whimper. Taehyung tugs at Hoseok’s hair again when the elder, taking advantage of his blissed out state, bites at his shoulder and he feels the beginnings of a bruise starting to form.
“Are you maybe part beast?” He asks, pulling away and staring down at Hoseok whose eyes, he’s startled to find, have specks of gold among the dark brown in them. The elder’s lips curl up into a smirk, and as he runs his eyes up and down Taehyung’s naked torso appreciatively, the younger wonders exactly what kinds of colourful marks and patterns he’s going to find himself sporting the next day in the mirror. His eyebrows furrow when he realizes that he’ll have to borrow from the other’s wardrobe most likely for tomorrow, considering how his loose, plain t-shirts that he’s made a habit of cutting up, help in hiding absolutely nothing.
“You wanna find out?” The other murmurs against his lips, breaking his thoughts, teeth tugging at Taehyung’s lower lip before raising a hand to the crown of his head and tilting the younger’s face down until their mouths meet. They kiss rather languidly, slicked up lips moving against each other’s softly in a slow, careful rhythm. It’s much different from the rough dance Taehyung’s been expecting especially considering the way the elder’s mouth has been bruising his upper body for the last fifteen minutes. The sweet gesture makes his heart thud in his chest, especially with the way Hoseok’s hands come up to caress his cheeks, before he breaks away to press little kisses all across Taehyung’s face.
When he starts to giggle at the sensations of lips against his eyelids, Hoseok tugs at his wrists to settle Taehyung more firmly in his lap, intertwining their fingers tightly, and looping his arms around the younger’s waist, dragging Taehyung’s hands back with him into a makeshift tied up position. He holds Taehyung steady by pressingly his elbows firmly against the younger’s sides, keeping him in place. Hoseok joins their mouths again, kissing Taehyung softly, before tracing his tongue across familiar lips begging for them to open up and let him through.
Their kiss changes gear once their tongues touch, shifting from slow and soft to heated and breathy, and they both moan in sync at the sensation of their tongues battling together. Taehyung starts to claw against the hold, trying to free his hands so he can bring them up and touch, tug, or hold – anything – but the more he struggles, the tighter the elder’s hold becomes.
When he whimpers at the combined pain of his protesting shoulder joints from the position of his arms behind his back and Hoseok’s tight death grip, the elder’s extremely swift in pulling his lips away from Taehyung’s, the younger’s surprise almost causing him to move along with the elder, following after the heart-shaped lips to tangle their tongues together again. Hoseok lets Taehyung’s hands go next, practised hands coming up to ease his shoulders and massage them, before he asks, concerned, “Sorry, did I hurt you?”
“A little,” Taehyung admits, smiling when Hoseok doesn’t let him slide off his lap, but rather leans back, dragging the younger down on top of him before rolling them over. Hoseok smiles widely when Taehyung starts to giggle under him, rolling his shoulders to indicate to the elder to remove his hands. Looping his hands up and around Hoseok’s neck, caressing his choker momentarily, he tugs him down and closer to his own body, smiling when the elder uses his hands to brace himself against the floor instead of falling right on top.
He tilts his chin up, waiting for Hoseok to close the distance between their mouths, and when he doesn’t, smirking down at Taehyung innocently, he growls at him. Pushing against the back of Hoseok’s head, Taehyung leans his upper body up, neck and shoulder’s protesting at the new, uncomfortable position, before he finally manages to press another kiss against Hoseok’s mouth. He uses his teeth this time, tugging at the elder’s lower lip and using it to pull his head down, not pausing even when Hoseok winces at the pain.
Taehyung smiles against the kiss when Hoseok moves to rest his weight on his knees, not breaking their kiss as he next brings his hands up to cradle the younger’s face and tilt it properly to angle their kiss deeper. Moaning at the sensation of Hoseok sucking gently on his tongue, Taehyung finds his hands drifting lower, roaming across Hoseok’s lean chest, feeling the traces of abdominal muscles that were present in the summer before the new semester started.
He feels himself straining in his pants the longer and more heatedly they kiss, and in a moment driven purely by instinct, he ruts upwards moaning and breaking their kiss when their fronts brush together, sending heat shooting through his body at the friction it creates. Hoseok catches on to the hint, rutting down against him, laughing when Taehyung’s fingers tighten in the belt loops of the elder’s jeans to keep him from straying too far up. The younger arches his back and starts to grind back up, panting loudly, when he hears Hoseok groan deeply in his ear, forehead pressed against Taehyung’s shoulder.
When his hands drift to the top of Hoseok’s jeans, unbuckling his belt and unbuttoning his jeans, eager to touch and be touched, Hoseok slips out of his hold and moves lower to press more kisses across his chest. Taehyung groans when he tries to reach down and realizes Hoseok’s hips are too far, settling for locking his legs around the elder’s stomach, “Where are you going?”
Hoseok grins up at him through his lashes wickedly, chin digging into his navel, but he doesn’t respond; instead, he moves an inch lower, tongue coming out to lick up a stripe of skin from the band of Taehyung’s jeans all the way up to his belly button, circling around the depression before dipping his tongue inside, and then pressing a lingering kiss to the skin above. He chuckles darkly when Taehyung shudders, elbows giving out as he throws his head back to groan at the scene. The elder sits up on his knees later, hands moving back to wrap around Taehyung’s ankles before he untangles the younger’s legs from around his abdomen.
Jeans still unbuttoned and slightly off his hips, Hoseok crawls back up towards Taehyung to tangle their mouths together, laughing when Taehyung nips at his lips and rolls them over, pining Hoseok down with his weight, before slipping a hand into the elder’s jeans. He’s pulls up the band of Hoseok’s boxers and then lets it go, causing it to snap loudly against the elder’s skin, giggling when Hoseok groans and curses against his lips, breaking this kiss, and tightening his grip on the younger’s hips.
They’re interrupted when Taehyung’s cell phone goes off, startling them both enough to make them jump, as they glance back to the low table nestled in the middle of the living room, papers, pens, pencils, highlighters and sticky notes scattered all around. Cursing softly, Hoseok nudges Taehyung off him, the younger automatically moving towards his phone, and sighing when he sees his best friend’s name across the scene.
He holds up a finger towards Hoseok who’s now sitting up, and reaching across the room for both of their shirts. Taehyung frowns when the elder slips into his own first, eyes drifting down to notice his jeans still unbuttoned, and brings the phone to his ear.
“Tae, are you and hyung working on Stats right now?” Jimin’s voice filters through the phone, clear as day, and it makes Taehyung freeze up a little as he turns his head to glance back at Hoseok. His vision is momentarily blinded, and when it clears up he realizes Hoseok’s shoved his hoodie over his head, the elder now sitting in front of him, lips curved up into Taehyung’s favourite smile. His body itches to move forward and peck the elder’s pink, heart-shaped orifice but Jimin’s voice interrupts him again.
“Taehyung? Can you hear me?”
“Oh, yeah, I can,” Taehyung replies, struggling when Hoseok tries to pull his hand through the sleeve of one of the hoodie, making him feel like a kid. “Wait, just a second.”
He makes a noise of protest, before Hoseok takes it upon himself to switch his phone into the other hand, and pulls his other arm through the woolen fabric. His head sneaks under Taehyung's sweatshirt one last time, and he feels lips being pressed against the skin right above his hammering heart right before the elder pulls himself back out and tugs his hoodie down to cover his stomach. He glares at Hoseok, shoving him away, especially when he starts to laugh, and when he brings the phone back to his ear, he finds Jimin calling his name, “Taehyung? Are you okay?”
“’M fine,” Taehyung waves a dismissive hand, crawling towards his and Hoseok’s study table, shifting around the papers to confirm it is indeed statistics that they’re mulling over. “Yeah, Jiminnie, we’re…uh…doing Stats.”
Jimin remains quiet on the other hand, and Taehyung knows that his best friend knows that they’re not really studying, not anymore, at least. Arms wrap around his waist right at that moment, and Taehyung relaxes in them immediately, leaning back against Hoseok’s chest as the elder rests his chin on his shoulder. When Hoseok’s hands start to roam lowers, running across the inside of his thighs, he smacks his hand, holding it in his own tightly so they don’t continue their previous actions.
“Okay…” Jimin says after a while. “Okay, do you know why the factorial ANOVA’s eta-squared is considered a partial one?”
Taehyung’s eyes widen and he starts to frantically sort through his and Hoseok’s papers, before squeaking out, “Uh, can you repeat that again?”
Hoseok takes the phone from his hand, turning it onto speaker mode and placing it on the table, moving from behind him to sit beside him.
“Why is a two-way ANOVA’s eta-squared partial?” Jungkook’s voice comes through this time, sounded a little nasally, and Taehyung wonders if the younger’s still sick with the cold he had come down with over a week ago.
Hoseok’s eyebrows furrow at the question and he flips through his notes, “Wait, where’d you get that question from?”
Biting on his lip when both Jimin and Jungkook sigh, Taehyung gives Hoseok a sheepish look, glancing at his phone when Jungkook talks, “It’s the first question from last year’s exam.”
“Oh, right, er, we haven’t moved onto that yet,” Hoseok says quickly as he skims through his notes on eta-squared.
“Oh, what are you doing then?” Jimin asks, and Taehyung can picture him biting down on his pen, chewing as he stares down at his papers. “The exam is tomorrow, you know.”
“Yes, I know, Jimin,” Taehyung pouts at the phone. “We were just…revising theory right now. I figure the calculations won’t be so bad.”
“Yeah, as long as you don’t screw up SS total,” Jungkook responds. “I hope he doesn’t give ridiculous numbers like last time. I hate decimals so much.”
“Anyway, so since you were revising theory, can you tell me why the eta-squared is partial?” Jimin interrupts after.
“I think,” Hoseok looks down at his worksheets. “I think it’s because we don’t divide the factorial etas by SS total, you know? We only divide them by whatever we’re calculating the eta for plus SS error.”
“Oh, that’s right! I remember the professor said that,” Taehyung exclaims, snapping his fingers. “She said that for it to be full eta it’d have to be divided by SS total, and that would mean we divide it by SS cells plus SS error, which we’re not.”
“Oh, that makes sense!” Jungkook says, cough after followed by some sniffling, “I guess you must really be brushing up on out theory.”
“Yeah,” Hoseok laughs a little, winking at Taehyung. “We are. Anyway, if you have anymore questions, can you send it to the group chat?”
“Why can’t we study together?” Jimin whines from the other end. “We take one class all together, and then you don’t even study with the two of us.”
“Sorry, Jimin. Why don’t you guys come over later in the evening? We’ll order pizza and drinks and we can go over all the past exams together?”
“Why can’t we do that now?” Jungkook asks, tone confused. “We can review theory and calculations together, and then do the past exams, too?”
“Uh, we’re kind of in a rhythm right now, Kook,” Hoseok says carefully. “We’re scheduled to take a break in two hours, how about you come after that?”
“You’re not really studying, are you?”
“We are!” Taehyung protest. “Okay, anyways, come later, okay? We’re going to go now, bye!”
Hoseok lets out a small laugh when they finally hang up, cutting the line, and he glances to find Taehyung smiling at him. He waggles his eyebrows when the younger stares for too long, and makes a soft noise of surprise when Taehyung dumps the papers in hand on the table and turns to straddle him again.
“Now, where were we?” Taehyung whispers against his ear, tongue coming out to lick at his earlobe before making its journey down Hoseok’s neck, over the bump of his choker, causing the elder to shiver.
“Whoa, whoa, Tae,” Hoseok stills the other with the firm press of a hand against his hip. “We have to study, remember? The exam is tomorrow.”
“I know, but really quickly, I promise!”
Hoseok frowns, shaking his head but smacking Taehyung’s butt lightly, “Nope, not until we finish everything, okay babe?”
“But then Jimin and Jungkook will come over,” the younger pouts. “We haven’t touched since exams started.”
“Just one more day, okay?” Hoseok leans up to give him a soft kiss. “Last exam tomorrow, sweetheart, and then we can have marathon sex all day and all night.”
Taehyung slumps against his shoulder, leaning his head down against his chest, “I don’t want to study anymore.”
Hoseok runs a comforting hand up and down the younger boy’s spine, frowning when he realizes Taehyung’s gotten thinner at the way the bones protrude, “Don’t be like that sweetheart, think of the clinical psych program, hm? How long have you been dreaming about doing your Master’s in it?”
“Very long,” Taehyung frowns, pressing his lips against Hoseok’s shoulder.
“Come on, just one more exam, then. You won’t do well if you don’t study for this last exam properly, and if you don’t do well, you can’t maintain that GPA of yours.”
“But I don’t like statistics; it’s boring,” Taehyung mutters, lifting his head to rest his chin on Hoseok’s shoulder, squeezing the elder into a hug. “I can do the other stuff fine.”
“You’re always going to have to do stuff you don’t like,” Hoseok says quietly, against the ticking the wall clock in their room. “Come on, sweetheart, let’s study, huh?”
“You have it easy,” Taehyung mutters, crawling off. “Your future’s secured, and you just need to maintain a 3.3 now.”
“Hey, that’s not fair,” Hoseok tugs him back, turning Taehyung’s face gently towards him by the chin. “That’s really not fair, Tae.”
“Well, I’m sorry,” Taehyung mutters, escaping the elder’s hold, moving to sit across from Hoseok, pulling and sorting through the loose leaf papers that are strewn across the short but wide wooden desk, light in colour. Hoseok doesn’t respond to that statement, just silently waits, and less than a minute later, Taehyung looks up with a sigh, ruffling his own hair as he apologizes.
“It’s okay,” Hoseok mumbles back, crossly, trying to prevent his lips from quirking up when Taehyung leans forward to peck his apple cheeks in apology, murmuring something along the lines of “my boyfriend’s so cute”. He doesn’t smile even when the younger gives him a kiss, mouth still downturned into a frown, but he can’t help but giggle when he feels a tongue trace his little dimples, pushing Taehyung away lightly.
“What are you doing?”
“Nothing,” Taehyung’s grin is angelic, teeth on full display, and Hoseok can’t help but shake his head at the other, before he tilts his hips up, buttoning and zipping up his jeans again winking when the younger’s eyes drop down to his hands as he fiddles with his pants. He scoots forward, until he can feel his shin meet Taehyung’s and folds his legs, both of them sitting cross-legged with their knees touching under the table.
“So, where should we start?” Hoseok asks, looking back up at his lover with a grin, but Taehyung merely shrugs in response, not meeting his gaze as he gets his notes back in order.
“How about the beginning of the semester?”
“Okay, so what’s the logic behind the ANOVA?” Hoseok asks, squinting as he reads off a question he’s scribbled into the margins of his lecture slides.
“Excuse me?” Taehyung looks almost offended at the question, raising his eyebrow and making the elder burst into laughter. He frowns when Hoseok’s laughter doesn’t curb, pouting as a last measure, which makes Hoseok coo at him before pulling him forward for another kiss.
“How about we just do what we were doing before? Who needs an education, right?” Taehyung asks with a winning smile, wiggling his eyebrows even when Hoseok rolls his eyes and shakes his head.
He runs his fingers along the row of coloured pens, settling for the blue one, before murmuring, “As the responsible one in this relationship, I’ll have to say no.”
“Yeah? Since when were you the responsible one between the two of us?”
“Well,” Hoseok uncaps his pen, pointing the tip at Taehyung, “since now. Now let’s get crack-a-lacking, darling.”
“I don’t get it,” Taehyung looks between the question on his paper and then back up at Hoseok, who’s frowning down at his own sheet as well. “Why’s the alpha changing here, but not there?”
“I don’t know,” Hoseok mutters back, looking up at Taehyung. “I have no clue. They’re both follow-up tests, why are we adjusting alphas for simple effects, but not the post hoc after?”
Taehyung groans, head falling back onto the table, fingers letting go of the pen in hand. He lifts his head to watch Hoseok with his phone out, flicking through different webpages, looking or an answer, no doubt. His tongue peeks out of his mouth, a habit that comes out when he’s concentrating on something vert hard, and Taehyung can’t help it when he reaches forward and pulls the elder closer for another kiss. It startles Hoseok, if the way his eyes widen are anything to go by, and he frowns at Taehyung when the younger away, smiling softly.
“You’re worse than a kid, Kim Taehyung. Worse than a kid.” Hoseok mutters, eyes drifting back to his phone, and the frown remains in place. The use of his full name makes Taehyung scowl as well, and he sits up, leaning back in place.
“Oh! Okay! I got it!” Hoseok grins triumphantly. “Simple effects lock in the alpha and account for the error, so you don’t have to adjust the post hoc alpha as well. It doesn’t make sense, but it kinda makes sense.”
Taehyung hums, scribbling it down on a blank piece of paper, hand moving slowly as he concentrates on getting the words right, “So, for a 3x2 factorial, we use the point-o-one table for simple effects?”
“If they give us that table,” Hoseok murmurs.
“Can we use Bonferroni’s table in its stead, then? They have to give us that,” Taehyung looks up, expression serious for the first time in the entire hour.
“Yeah, that makes sense,” Hoseok nods. “But do we adjust for total comparisons like post hoc or only the amount we’re doing like a priori?”
“I think,” Taehyung pauses, sifting through papers, before pulling out a particular sheet, “in the lecture they adjusted it based on all comparisons.”
“Right, okay, makes sense,” Hoseok nods, making himself a note on the paper. “Okay, let’s do repeated measures, then?”
Taehyung sighs, looking up, and he stares at Hoseok for a few seconds, watching the way the elder’s fingers come up to scratch at his collarbone, pulling the shirt all the way over to his shoulder. He notices a darkening red mark right below the column of his neck, an inch away from the pendant of the elder’s choker, and he smiles at it before feeling the urge to reach out to touch it.
“Like what you see, baby?” Hoseok’s voice breaks his attention, and he finds his cheeks flushing at having been caught. He settles for a simple smile, head ducking, before he nods. He glances up when his lover laughs, not having expected him to nod affirmatively, but rather to deny the gaze with excuses on his tongue.
An idea hits him suddenly, and his head snaps up fast enough to make his neck hurt, eyes bright as he clasps his hands together, “Hyung! I have an idea!”
“Oh no,” Hoseok laments a little, looking at him with suspicious eyes, before asking, “what kind of idea?”
“A really, really, really, really great one!” Taehyung chirps, sitting up straight, using his hand to brush his bangs out of his face, grinning widely.
Hoseok gestures for him to continue, eyes still narrowed, but there’s a small smile playing on his lips when he sees the corners of the younger’s mouth stretch.
“You know how there’s bingo?” Taehyung tries to look as innocent as possible as he leans forward, hands folded on top of his papers across the table.
Hoseok hums, gesturing for him to continue, “But what does that have to do with stats?”
“Have you ever heard of strip bingo?”
Hoseok takes a deep breath, wheels in his mind turning, “…I have.”
“Let’s play it!” Taehyung grins mischievously. “It’ll be great. For every answer I get right and you get wrong, you’ll take off a piece of clothing and for every answer you get right and I get wrong, I’ll take something off.”
Hoseok purses his lips together tightly as he reconsiders, eyeing Taehyung up and down, “What if we’re both right?”
“Neither of us takes anything off.”
“How about we make it a little more interesting?” Hoseok’s grin is downright sinister, voice dropping an octave. It sends a thrum of pleasure through Taehyung’s veins, and his mouth opens as he stares at his lover.
“For every question we both get right, I get to suck a pretty little bruise wherever I want on your body and vice versa?”
Taehyung sucks in a deep breath, considering, “And if we’re both wrong? Do we both take an item of clothing off?"
Hoseok looks away this time, contemplating, before he nods, “Deal.”
“Great!” Taehyung chirps scooting forward again, “Let’s play, hyung.”
“Hold on,” Hoseok holds up a hand, and picks up a thick package lying on the edge of the table. “Let’s use this review package.”
He flips through the pages, nodding, “there’s answers at the back and a total of 40 questions.”
Turning to his phone, the elder punches in a few numbers, “You need at least an A in this exam, so we need to get 34 questions right.”
“If we end up with less than 34 hickeys, each, then no sex – for two weeks, starting tomorrow.”
“That’s ridiculous!” Taehyung yells, shaking his head. “That means we both need to get at least 34 of those questions right! The probability of that happening is low, hyung, nor do I have space for 34 hickeys on my body. Plus, the game ends once someone gets naked.”
“It doesn’t have to,” Hoseok reasons, “we can continue with the hickeys even if we run out of clothing items.”
“I’m sorry, hyung, but do you seriously expect me to kiss your hand and not your dick when you’re sitting naked in front of me? And if I do kiss your dick, do you expect me to stop at that and go back to answering these questions?”
The elder laughs at the suggestion, “True, a tad bit crude, but true. Okay, let’s do it this way, then. We don’t put clothes back on under any circumstance, but if we both get completely naked before at least...25 marks, then no sex – for two weeks.”
“Two weeks is way too long!” Taehyung protests. “One week! You’re not going to able to wait that long either.”
“Oh, but I can, sweetheart, I can,” Hoseok smiles widely. “But alright, because I like to indulge you, 10 days, no less and no more.”
“Fine,” Taehyung nods with a scowl. “10 days. But if we duke it out until the end of the 40 questions, and neither of us is completely naked, we’re having marathon sex tomorrow night.”
Hoseok laughs, “I’m fine with that. As many rounds as you want, babe, as many rounds as you want.”
“And I get to top half of them?” Taehyung raises an eyebrow
“Not half. A quarter at best.”
“Hell no, one-third!”
“Fine,” Hoseok relents with a slight frown. “One-third. So, the goal is for both of us to be right rather than one, got it?”
“Yup,” Taehyung nods, eyeing the thick booklet. “Do both socks count as one item? Or earrings?”
“One sock is one item,” Hoseok answers after a few seconds. “Belts are also a clothing item.”
“I don’t have a belt though!”
“I don’t have earrings, sweetheart, so you’re already ahead there.”
“Okay, fine” Taehyung sits up straight, watching Hoseok mimic his position, “let’s do it like that.”
“Shall we…kiss on it? Hoseok raises an eyebrow, smirking.
“Don’t people usually spit and shake hands on it?”
Hoseok grins wide, lips curving up mischievously, “We can swap spit, instead? Close enough, right?”
Taehyung snorts, “Says the person who was willing to wait two weeks, huh?”
“Is that a yes?”
“Come here,” Taehyung rolls his eyes before leaning forward and closing his eyes as soon as Hoseok starts to lean in to capture his lips.
“Okay, first question,” Hoseok takes in a deep breath, glancing at the clock. “Difference between within-subject factors and between-subject factors?”
Taehyung’s eyes widen at the question, and he flips through his self-made cheat sheets, skimming through the sections to find the correct answer. He looks up at Hoseok who’s glancing between a few loose-leaf pages, before scribbling down some answers. “Are electronic aids allowed?”
“None that you can’t take into the exam hall,” Hoseok answers swiftly, writing some more, before grinning up at him. “Ready, babe?”
“No,” Taehyung mutters, frowning as his self-esteem takes a hit at being unable to answer the first question of the exam. “Give me a minute.”
“Just a minute, then,” comes Hoseok’s cheeky reply, grinning widely as he adds. “I’ll set a timer.”
Taehyung growls softly, glaring up at Hoseok when he starts to countdown, making him more and more frantic the smaller the numbers get.
“Fine, fine!” Taehyung says at the 10-second mark. “You win this round. I’d rather die with dignity than have you humiliate me. What’s the answer?”
Hoseok laughs, “So dramatic, love. Okay, so a between subject factor is one that you evaluate by testing a different subject at each of its levels. But a within-subject factor is one that you evaluated by testing the exact same subject for each of it’s levels.”
Taehyung bites at the pen at his mouth, looking down at his notes, before looking up, “Can you give me an example?”
Hoseok nods, looking through his notes, “Let’s say I have five different food items, okay? If I made you taste each one and then rate how good it tasted, that would be within-subject. Because I’m making one subject – you – go through all five levels – which would the different food items.”
“But,” Taehyung holds up a hand to stop the elder, “if you get five different people and each of them tries one item, then that’d be between-subject?”
Hoseok nods eagerly, “Exactly that, Tae. You’ve got it. Unfortunately, though, I’m going to have to ask you to strip.”
“Whatever,” Taehyung mutters, before slipping off a single sock. “There, happy? What’s the next question?”
“Nuh uh, babe. Aren’t you forgetting the latter half of the deal?” Hoseok looks him from head to toe, wondering where to place his mark.
“Wait, no! That’s only if we both get the question right, isn’t it?” Taehyung looks confused. “Otherwise, one of us might be tempted to get the questions wrong.”
“If you purposely, get the questions wrong, Tae,” Hoseok’s eyes glint dangerously, “I’m going to leave my hickeys in spots which you won’t be able to cover. How about that?”
“You think I’m going to be ashamed of the love bites?” Taehyung asks, crossing his arms. “I don’t particularly care. I’ll wear them proudly for all you know.”
Hoseok tilts his head at Taehyung, staring with a small smile, “Don’t you have an interview next week for a job, sweetheart?”
The younger sighs, “Fine, let’s do it like you said.”
“Great! Any preference to where?” Hoseok moves around the table, sitting beside the younger and turning Taehyung until he’s facing him.
“Anywhere,” Taehyung answers soft enough to make the elder spare him a glance a soft smile. He watches Hoseok runs his eyes across his body, fingers settling to trace patterns on his left, unclothed foot. His thumb moves up higher, rubbing small circles into the side of his foot, right by his ankle boke. Moving to lay down on his stomach, he makes Taehyung’s heart stutters when he presses his lips press over the small stretch of skin against the side of the younger's foot, once, twice, and then finally a third time, lingering there for a few seconds.
“There,” Hoseok says, moving around the table. “I don’t think I can mark that area, but I think kisses are fine, too. ”
Taehyung doesn’t say anything in response, slowly turning back so he’s across from Hoseok again, and when he looks up Hoseok’s chuckling, head tilting as he looks at Taehyung with a curious gaze, “I don’t think it’s healthy to be that red in the face.”
“Mind your own business!” Taehyung snaps, ruffling his hair and he wills the flush in his cheeks to go away.
“But you’re my business,” Hoseok responds cheekily, only to be hit in the face with a cushion from the couch right behind Taehyung. The younger picks up the review booklet determinedly, reading off the next question.
“What is the difference between Tukey’s HSD and the Newman-Keuls test?”
“Oh, that’s easy,” Taehyung murmurs to himself after he finishes the question, glancing up to see Hoseok nodding in response. He writes his answer quickly, not even needing to look at his notes, and notices Hoseok still working and frowning at his paper when he does.
“You have a minute, left,” Taehyung says innocently, mimicking the elder’s earlier words and starting a countdown. Hoseok looks up at him with a glare, nose scrunching cutely when Taehyung starts to laugh at him.
“I have the answer,” the elder says once Taehyung finishes counting to 0, offering Taehyung his paper. They exchange answers then, and Taehyung nods his head as he reads through it.
“So, we’re both right?” He asks looking up, and Hoseok grins at him.
“Which one’s more conservative, though?” The elder asks, standing up and walking around over to where Taehyung sits. “And which one is more powerful?”
Taehyung hums at the question, pulling Hoseok down to sit beside him before settling himself astride the elder’s thighs, fingers slipping and running under the loose t-shirt Hoseok is sporting, “I think Tukey’s is more conservative?”
Hoseok smirks down at Taehyung when he pushes the elder’s shirt up, scooting backwards until his mouth hovers right over his lover’s stomach. The younger looks up at him through his lashes as his tongue runs over the thinning valley in the middle, teeth grazing over, before he presses his lips to the skin and sucks harshly.
The elder pulls him up gently by the hand later, once he feels sufficiently done and is admiring his mark, murmuring, “Why is it more conservative?”
“It uses the biggest r,” Taehyung sighs out softly, tilting his neck to the side as Hoseok mouths behind his ear, biting at the area. “Which means a higher critical value for each comparison.”
“Right, so Newman-Keuls is more powerful, then? Because higher possibility of finding something significant?” Hoseok whispers against his neck, leaning back to examine the mark with pleased eyes, thumb running over the spot a few times gently.
“Yup,” Taehyung nods, moving off the elder with a bit of a sigh. He grabs Hoseok’s hand when the elder moves to get up, shaking his head, “Stay. It’s probably better if we sit side by side.”
Hoseok smiles, sitting back against the couch, not even a millimeter of space between the bodies as they sit side by side, thighs pressed against each other and legs stretched out.
“If I tell you how to calculate Tukey’s WSD,” Taehyung starts off, looking down at this notes, and then turning to Hoseok, “will you let me kiss you once?”
Hoseok nods, “Sure!”
“So, you take the q values of both HSD and Newman-Keuls for a comparison, average them out, and find the new omega based on that,” Taehyung grins widely.
“What’s an alternate way?” Hoseok asks, twirling his pen in his hand. “If you’ve done both HSD and Newman’s?”
“You average out the omega.”
“Yup,” Hoseok grins, moving forward when Taehyung pulls him close, opening his mouth under the younger’s insistence.
“Alright,” Hoseok puts a hand on his hip to stop him. “next question. What’s the structural model of a factorial ANOVA and what does each term represent?”
Taehyung snickers when Hoseok continues to stare down at the paper, “You don’t remember the structural model do you?”
“I have it written down somewhere,” Hoseok mutters, looking through his papers, even as Taehyung happily jots his answer down. “Wait, what’s a structural model?”
“I’m not telling you,” Taehyung sticks his tongue out. “Are you going to ask the invigilators that?”
Hoseok pouts, “Fine, you win. What is it?”
Taehyung grins as he slides his paper towards the elder, “This is the factorial one - seem familiar?”
“I think so,” Hoseok squints his eyes. “Is the t for treatment effect and the e for error?”
“Yup, and irc is interaction, row, and column,” Taehyung adds. “Do you want me to write out the simple, repeated measures, and mixed ones as well?”
“Yes, please,” Hoseok beams at his boyfriend, before looking himself over, “meanwhile I shall take off this sock.”
“Be original!” Taehyung exclaims, stopping his hand. “Take something else off.”
“Why can’t I take my sock off? It’s bound to come off at some point?” Hoseok shrugs out of the younger’s hold, pulling at the knitted material.
“But I took my sock off,” Taehyung pouts, “can’t you take your shirt off instead?”
Hoseok bursts into laughter at the request, fixing Taehyung with an endearing look, “Absolutely not, sweetheart. I’ll take my belt off instead. Now, where do you plan on marking me?”
Taehyung frowns as he writes down the information, passing the paper over to the elder who goes through it, trying to memorize all that’s written. His lips move silently as he starts to repeat the words to himself, and he lets out a small gasp when he feels warm breath over the skin of his waist, peeking down to find Taehyung tugging down the band of his jeans.
“Tae,” he growls out in warning, but the younger pays him no heed as he laps his tongue over the area, just above his pelvic bone and then bites. “Fuck.”
Taehyung presses soothing kisses to the area, grinning when the area starts to redden, the shade getting deeper with every passing moment. He pats Hoseok’s hip twice after, smiling at him as if he hadn’t just sunk his teeth into the skin moments ago, “All done. You should get more questions wrong, you know. I love the little noises you make.”
Hoseok clutches the papers in hand tightly, crumpling them in his tight hold while the other hand snakes under Taehyung’s hoodies and wraps around his waist possessively. He places firm pressure against his boyfriend’s back, shoving him forward, right into his own chest, and then captures his lips, the kiss broken a second later when Taehyung pulls away.
“You didn’t even work for that!” The younger exclaims, slapping Hoseok’s chest lightly. “I did something in exchange for the kiss.”
“Remember how we talked about those post hocs before?” Hoseok asks, voice husky and deep as his thumbs comes up to rub against the underside of Taehyung chin, moving down to repeat the same motions against the column of his neck.
Taehyung gulps, feeling his Adam’s apple bob under Hoseok’s touch, nodding in response, not trusting himself to speak.
“Dunnett’s test is the test that should be done when you’re comparing a control group to other groups,” Hoseok says in response, pressing lightly against the younger's throat. “There, I worked for it.”
“Do you calculate it the same way as the others?” Taehyung asks, still in Hoseok’s lap, looking down at his lover with hooded eyes.
Hoseok shakes his head, patting his hips a few times and gesturing for him to turn. Taehyung does as he’s asked, turning and sitting in between the elder’s legs, who leans forward, chest making contact with the younger’s back, as he reaches for a sheet, “See here? The omega calculation is different – you use a t-statistic instead of a q-statistic.”
Taehyung pours over the sheet, “And you can find Dunnett’s t from k groups and df error?”
“Yeah, make sure control is part of the k groups, and once you have that, the omega formula is similar to the other ones, except you multiply the MS error by 2 before dividing and square rooting.”
“Do you think she’ll give us both formulas?” Taehyung turns, looking up at Hoseok who nods.
“She will, but you still need to know how to find Dunnett’s t.”
“Alright,” Taehyung moves out of the elder’s lap, picking up the review sheet as he goes. “Ready for the next question?”
Three questions later, they’re both still almost fully clothed, save for Taehyung’s single white sock and Hoseok’s belt, but with three new hickeys. Hoseok eyes Taehyung as he presses soft fluterring kisses against the inside of his wrist, smiling against the skin, before pulling off, rubbing his index finger over the slightly reddened skin. Hoseok smiles at the mark when Taehyung moves back a step, clearing his throat. He bringing his wrist up to examine it, making eye contact with the younger, before pressing his own lips against the mark. He lets out a small laugh when Taehyung blushes at the action, rolling his eyes at him.
They both sit still for a few seconds, and Hoseok can see the question in the younger’s eyes, “Kiss?”
Taehyung leans forward, giving him a sweet, gentle peck, and chuckling when Hoseok asks for another.
“Work for it,” he says simply shrugging his shoulder, and reading off the next question. “What kind of factor(s) does each of the following ANOVAs have: simple, two-way, RM, and mixed?”
Hoseok frowns, “I don’t know that one.”
“I don’t either,” Taehyung agrees, turning to glance at the elder. “Do we both take something off in that case?”
“I guess,” Hoseok replies, before he strips himself of his shirt. “There, I took it off, happy?”
Taehyung grins nodding, and then mischievously pulls his other sock off.
“Hey!” Hoseok protests, “that’s unfair!”
“Life’s unfair,” Taehyung shrugs, eyes running over Hoseok’s chest admiringly. When he brings a hand up to touch, his boyfriend smacks his hand away, moving an inch away, frowning.
“Let’s talk the question out,” Hoseok’s voice takes on a serious tone as he glances down at the paper. “I know one-way ones have one factor and it’s between-subject.”
Taehyung nods, hands stealthily pinching at the other’s nipple, making Hoseok turn to glare at him, “Keep your hands off, Tae.”
“Okay, okay, I know repeated measures is one within-subject based on what you said before, right?”
“Yeah, and two-way has two factors, both of which should be between-subject, right?”
Taehyung grabs his pen, biting the end between his teeth, and then nods, “Yeah, we’re not testing subjects across all levels, so it has to be.”
They both scribble the information down quickly, turning to glance at each other and saying at the same time, “What about mixed?”
They burst into laughter together, Hoseok’s chuckling making his shoulders shake in a funny manner, before he sighs out leaning himself against Taehyung, “Can you explain mixed design to me? I missed that lecture.”
Taehyung presses his lips into a firm line, “I know they said that it was like having two repeated measures, so one of the factors has to be within-subject. It’s like when you have two different groups, say children and adults and you make each group go through all the same levels.”
“I guess that makes it within and between, then?” Hoseok straightens out, jotting down the explanation. “Because children and adults are different groups from each other, but since within themselves theygo through each level, it makes the age group factor a between and the treatment one within?”
Taehyung picks up the review package, “Can I check the answers at the back?”
“At the end,” Hoseok doesn’t look up. “Just to make sure you don’t cheat.”
“I wouldn’t!” Taehyung gasps, hand lifting up to his heart. “You trust me so little. I am hurt.”
“Would you like me to kiss it all better?”
“…that works,” Taehyung says with a grin, leaning forward and offering his lips.
Hoseok plants a peck of his nose, instead, “There, all better now.”
Taehyung can’t help but smile at that, leaning away, before moving on over to the next question, “Alright, what’s the df total for a simple ANOVA with three levels, each with a sample size of 5?”
“On the count of three?” Hoseok asks, and Taehyung nods, mentally calculating.
“14!” Both of them exclaim at once, giggling as they turning to look each other.
“Can I go first?” Taehyung asks, moving to sit on his knees, and pushes against Hoseok’s shoulders to lean him against the couch before the elder can agree or disagree. He leans down, breathing over his collarbones, watching the way his lover shudders under his touch, breaking out into goosebumps. He kisses the exposed skin, suckling softly a row of three small hickeys while Hoseok’s fingers tangle in his hair, pulling at it and groaning when the younger's teeth come down to bite down at his nipple.
When he leans back up, he smirks at the dark look Hoseok shoots him, and in a blink of an eye, he finds himself on the floor, his boyfriend hovering right over him, “Hyung?”
“Jeans off,” Hoseok taps two fingers at the side of his hips. “They’re in the way.”
Taehyung makes a noise of protest, “Nuh uh, you don’t get to mark me there, until we’re far enough for me to have taken them off.”
“Since when was that a rule?” Hoseok glares. “I hadn’t taken my shirt off earlier when you marked my stomach, but you still pushed it off, didn’t you?”
“Hyung, please,” Taehyung pleads softly. “I won’t be able to able to focus if you do. Just pick anywhere else.”
“Fine,” Hoseok huffs, before he lifts up the edge of the younger’s hoodie, slips his head underneath, and making the younger groan at the sight of a lump visible for under. Taehyung feels fingers caress his sides softly, making him feel hot and needy rather than ticklish, and he squirms a little to dislodge them, until Hoseok’s hands press against his hips tightly, holding his down and making movement difficult. He presses the back of his lips against his hand to hold in a moan, feeling his breath quicken, when Hoseok’s tongue runs across the width of his abdomen, continuously licking strips across his chest.
A small whimper escapes him when a tongue touches his nipple, and he tries to sound annoyed instead of aroused when he asks, “What are you doing? Can’t you hurry up?”
Hoseok slips out from under his shirt, grin sinister and hair tousled as he says, “Just feeling my way around, looking for a good spot. So many places to choose from, you know?”
Taehyung leans up on his elbows, lips downturned, “Please, hyung.”
“Alright,” Hoseok nods before he goes back under, pressing his lips right above Taehyung’s erratically beating heart. He kisses him there gently, whispering something against the skin that the younger doesn’t quite catch, and giving his nipple a complimentary lick at the end.
He slips out despite Taehyung expecting him to bite, running his fingers through his bangs to straighten out his hair, and raises an inquisitive eyebrow at his lover when Taehyung makes no move to sit up.
“…what did you say?” Taehyung asks, after he’s gathered his senses and managed to sit up.
Hoseok doesn’t respond, settling for giving him a mysterious smile, “Okay, so next question. What’s type I error and what’s type II error?”
Taehyung smiles at the question, knowing the elder always has trouble remember which is which, and he waits, until they’re both done and ready to exchange sheets.
“Wrong,” Taehyung says with a wide grin. “You mixed them up again.”
“No! I swear it’s like this,” Hoseok insists. “Wait, let’s check. I’m so sure I’m remembering this right.”
“You’re wrong, you always mix those two up,” Taehyung shakes his head. “It’s like this, hyung...do you remember that guy I dated?”
“Which one?” Hoseok asks, leaning back against the couch and crossing his arms as he tilts his head at the younger.
Taehyung rolls his eyes, turning to sit facing Hoseok, “That guy I dated.”
“I said, which one, babe?”
The younger huffs, narrowing his eyes, “Do you think you’re cool when you do that? Pretending to not know something so that I have to spell it out for you? If you do, then let me tell you, you’re absolutely not.”
He receives a small smile as Hoseok runs a hand through his own hair, propping an elbow up on the couch and leaning his head in the palm of his hand, “Yeah, I remember.”
“Alright,” Taehyung bends his legs at the knees wrapping his arms around them, “well, remember it this way. He was my type I error, okay? But you…you’re my type II error.”
Hoseok raises an eyebrow, biting the inside of his cheek, “Excuse me?”
“Listen,” Taehyung glares, pressing a comforting hand against Hoseok’s right knee, smiling when the elder’s other hand comes out to twine their fingers together, “I thought he was the one for me, right? I was absolutely and completely convinced that the two of us were going to get married and have kids and a dog and a nice, big house in the suburbs someday, right?”
“Did you really think that?”
“That’s not the point,” the younger rolls his eyes. “The point is that I thought he was the one for me when he wasn’t. In a way, you could say that I thought he was significant when he wasn’t. That’s what a type I error is – when you think the result is significant but it’s not.”
“A type II error then is…?” Hoseok asks, leaving the end hanging for Taehyung to answer.
Taehyung smiles, “Remember how I didn’t like you at the beginning? Didn’t want to see you, or talk to you. You asked me out for dinner that one time, too, and I rejected you, right? Broke your heart and –”
“– you didn’t break my –”
“Right, so as I was saying, I broke your heart, and I never in my wildest dreams ever thought you’d be the one.”
Hoseok hums, nodding.
“But look where we are now. So, essentially, if you were to think about it, I thought you weren’t the one, but you know what? You are. That’s why you’re my type II error, because I thought that you weren’t significant, but you are. Get it?”
Hoseok nods, trying his hardest to hold back the smile that threatens to break across his lips and stop himself from giving into the urge of pulling Taehyung close and kissing him until they’re both dizzy and unable to breathe, “Yeah, I get it now.”
“What, no kiss?” Taehyung pouts.
“Not if we want to continue doing these questions,” Hoseok replies pulling his hand away to slip off his ring, and then turning to face the younger, arms wide open, “anywhere you want.”
Taehyung laughs, contemplating, before leaning forward and slipping a finger underneath Hoseok’s choker, tugging it away from the skin of his.
“Take this off next,” he whispers quietly, before suckling a bruise right underneath it, earning himself a soft whine.
“Only if you take off your shirt, too.”
“We’ll see,” Taehyung replies, leaning down to kiss his neck again, before pulling back. “The next one’s a calculation question.”
“A question before we do that, though. I know I’m your type II error, but are you my type I error or my type II error?” Hoseok asks as he reaches across the table for his calculator, eyes drifting down to the numbers of the page, and he sneaks a peek at his lover whose eyebrows are furrowed as he punches the numbers in.
“Neither,” Taehyung chirps in between the frantic noises of them keying in numbers. “Kim Taehyung’s not an error.”
Hoseok chuckles, leaning to press a kiss against the side of Taehyung’s head, “True.”
“I hate SS total,” Hoseok tells him, breaking the silence they’ve established, after he reaches the maximum character limit on his calculator, pressing enter and then continuing to add the remaining numbers.
“Tell me about it,” Taehyung mutters. “Okay, I have my answer, do you have yours?”
“Yeah, mine’s 102, did you get the same number?”
Taehyung blinks down at his calculator, “…I got 510.”
“What?” Hoseok frowns, “What formula did you use?”
“The SS total one, the whole summation thing where you subtract the grand mean from each score and square it. Then you multiply that by n, no?”
“No, no,” Hoseok shakes his head. “You don’t multiply that by sample size. Not for SS total.”
“Really?” Taehyung pouts, grabbing the textbook and looking up the formula. He groans when it turns out the elder is right, sighing and removing an earring, a task that Hoseok has to assist him with.
“I’m going to save up this turn of mine,” Hoseok doesn’t turn towards Taehyung as he says that, “and invoke it later.”
“Wait, we never discussed saving up.”
“Yeah, well, we never discussed having to take off a clothing item before I could mark the skin underneath, so we’re even,” Hoseok replies offhandedly, smiling when Taehyung doesn’t challenge him and agrees.
Three questions later, Taehyung’s other earring comes off while he gains three hickeys and gives Hoseok two in return. It’s a fairly even game, except for Hoseok for having a point over him, and it bothers him when he tries to think about what the elder might be planning. They both get the next question wrong, and Hoseok tugs at the belt loops of Taehyung’s jeans, “I’ll take my choker off if you take your jeans off.”
Taehyung glares at the elder, “The deal was for my shirt and your choker, wasn’t it?”
Hoseok shrugs nonchalantly, “I changed my mind. You don’t have to if you don’t want, though. My jeans are definitely not coming off before yours anyway.”
Taehyung eyes him, mentally counting all the items Hoseok’s still got left and huffs, “Fine, deal, deal. They’re going to come off at some point, no matter what.”
“Good boy,” Hoseok presses a kiss to his hair, voice mocking.
Taehyung sighs, eyeing the choker on the elder’s neck, seeing the hints of a dark red hickey peeking from underneath the thin strap. Taking a deep breath, he angles his hips up, smirking at Hoseok when his lover’s gaze drifts down to his hands which rest at the edge of his hoodie. He makes a show of pulling his hoodie up a few inches, tracing his fingers along the skin above the jeans, before stroking himself down his thighs, jeans still on. He lets a moan slip through, head thrown back in pleasure when his hand comes up to press against his front, feeling himself underneath.
He breathes heavily, lifting his head to watch when Hoseok tugs his hands off his jeans, eyes black and pupils dilated with lust. The elder yanks at his arm to turn him to his side, pulling his legs out from under the desk, and laying him down on the ground. Leaning up on his elbows, he watches the way his boyfriend slithers down his body, until his mouth hovers right above Taehyung’s jeans, “Need help, Tae?”
Taehyung nods eagerly, watching him unbutton the younger’s jeans, teeth coming out to pull the zipper down. He moans out loud when Hoseok noses at his pelvis, pushing apart the flaps of his jeans, putting pressure against his throbbing member.
“Stop, stop, stop,” Taehyung keens, head thrown back and eyes tightly shut, when his body hunches inwards in response to Hoseok’s mouth roaming lower. “We need to finish this!”
Hoseok sits up on his knees with a nod, staring down at Taehyung with lust-filled eyes, shaking his head to get rid of the thoughts that cloud his mind. He offers a hand to pull the younger up, and he tilts Taehyung’s face up by the chin to give him a dizzying kiss, murmuring against his lips, “God, you’re so fucking attractive, sweetheart.”
“Thanks, you too,” Taehyung leans up to press a lingering kiss against Hoseok’s lips, before wrap his arms around Hoseok’s neck. It takes him a few tries, but his lover waits patiently, leaning further down for him until he’s successfully managed to unhook the choker, slipping it off and tossing it carelessly onto their table.
Hoseok’s hands at his chest still him where he is before he can move any closer, and when he shakes his head, Taehyung nods in understanding. He shimmies out of his jeans, tugging at the tight material, only for Hoseok to chuckle and help him take his off. His body shudders when Hoseok’s cold hands make contact with the warm skin of his legs, trailing up slowly, a finger at a time, before they start to caress the inside of his thighs.
“Hyung,” Taehyung pleads, when the hand moves too high up, trapping Hoseok’s hand between his thighs. “Please don’t. I won’t be able to stop. Please.”
Hoseok nods, removing his hand, placing it beside Taehyung’s jaw and tilts his head to side to the press their lips together. They resume their earlier sitting positions, thighs pressed together again and a shiver goes through the younger when his bare skin makes contact with Hoseok’s clothed one. The elder doesn’t notice it seems, by the way he’s staring down at the paper, and Taehyung shrugs the feeling off.
“In what case is the RM ANOVA less powerful than a two-way?”
“Is there ever a case?” Taehyung asks with furrowed eyebrows. “We’re reducing SS error with those so shouldn’t that make them more powerful? Because that reduces our MS error and so the denominator is smaller when calculating F. That should make it more powerful.”
“While that is true, there is still a case,” Hoseok smirks, ruffling his own hair. “It’s a little tricky to think about, so feel free to forfeit.”
Taehyung’s mind goes blank, and he breathes deeply through his nose when Hoseok’s hand starts to trail up and down his thighs again, “Shit, I can’t think with you doing that.”
“Do you give up?” Hoseok asks, moving his hands to underneath Taehyung’s thighs, before starting to drift up towards his member.
He catches the elder’s hand, holding it where it is, but nothing comes to his mind, no matter how hard he thinks. “Fine, fine, I don’t know.”
“Remember I saved up that earlier win?” Hoseok asks, when Taehyung’s fingers struggle to take his watch off, hands shaking. The younger nods in response, hands stilling when Hoseok’s hand comes out to grip his arm gently and he slips Taehyung’s watch off for him. “I’m invoking that now.”
“God,” Taehyung groans, understanding dawning when Hoseok moves to lie on his stomach, turning Taehyung until his face is right between the younger’s legs. He parts the younger’s legs apart gently, leaning forward to press a kiss right onto the younger’s boxers making him moan behind a hand. “At least tell me the answer.”
Hoseok’s smile is wicked as he looks up at Taehyung, maintaining eye contact even as he moves his face to press his lips against the inside of the younger’s thighs, just inches away from where his boxers end.
“The thing with RM ANOVAs,” Hoseok says as he litters a small area of his lover’s thighs with kisses, the sensation of his warm breath and lips cascading over the younger’s skin making Taehyung cry out, “is that not only do you reduce SS error, but you also reduce your degrees of freedom error.”
When the elder suckles the skin of his thighs, warm and wet mouth wrapping around the pale portion of the skin he’d been kissing earlier, Taehyung can’t help but arch his back, making mewling noises as Hoseok’s lips attack him. He falls back onto the ground, when Hoseok lets go of him, pulling away and then pressing a kiss onto the area as it starts to redden following the rupturing of the blood vessel closest to his skin.
He taps the area with his finger, next, sitting up to tell Taehyung, “That’s one mark.”
Taehyung groans, scooting down when Hoseok assumes his previous position.
“So, what happens then,” Hoseok continues trailing his tongue down the inside of Taehyung’s thigh, “is that reducing df error causes your MS error to be higher which in turns reduces your F obtained. Do you get what I’m saying?”
“Wait, hold on, hold on,” Taehyung protests when he feels lips attach to the skin of his legs again, and he leans up on his elbows, wishing he hadn’t with how obscene his lover looks between his legs. “Repeat that again, without your mouth on my skin please?”
Hoseok laughs, pulling himself away, but his hand remains wrapped around the younger’s thigh, fingers subconsciously stroking him, “When you have an RM ANOVA, you reduce both SS error and df error. Why SS error is reduced you know about already, but the reason why df error becomes smaller is because you obtain it by subtracting both df treatment and df between from df total. In a one-way and a factorial, your df error is simply your df treatment subtracted from df total. But in RM ANOVAs, you’re making your df error smaller, because you’re subtracting two things from your total instead of one.”
Taehyung thinks about it, trying to mull over the information in his head as Hoseok’s lips reattach to his thigh, pressing kisses all the way down to his knees, “Okay, yes, that makes sense.”
“Well so since you’re reducing both your numerator, SS error and your denominator, df error, your end result could either be bigger than it was before or it can be smaller. If MS error is bigger due to df error being too small,” Hoseok pauses to graze his teeth against Taehyung’s legs, “then your obtained F will be smaller and make the RM ANOVA less powerful.”
“But,” Taehyung shudders, interrupting Hoseok, once he starts to start sucking at his skin, “if the MS error is smaller because SS error is too small, then F is bigger. And that makes the RM ANOVA more powerful?”
“Essentially,” Hoseok nods, rubbing his thumb against the second bruise, pressing kisses and lapping at it to sooth the pain of the bite.
“God,” Taehyung groans, eyes closing and arm coming to cover them. “I can't believe you have the mental ability to explain all this shit to me while you're inches away from dick.”
Hoseok laughs, scooting up, and pressing a kiss to the younger’s lips, “I did agree to waiting two weeks didn’t I?”
“If…if…” Taehyung pauses, breathing heavily, sitting up on his hands once Hoseok moves away. “during the exam, this question shows up, and all I can remember is the sensation of your head between my legs and your lips against my thighs instead of the actually fucking answer, we’re breaking up, got it?”
Hoseok tilts Taehyung's chin up and presses a gentle kiss into his hair, making him sigh out and clutch at the elder’s forearms, trying to find stability in them and the will to make him to focus on the work at hand, “Okay, we’ll break up.”
“That’s not what you’re supposed to say,” Taehyung mutters. “Go through the answer with me once more?”
Hoseok chuckles, sitting back on his haunches and looks the younger straight in the eye, “RM ANOVAs reduce both SS and df error. Whether or not the ANOVA is more powerful will depend on the reduction. If SS error reduction is big enough to account for the raising of the critical value by the df error term, then RM is more powerful. But if the SS reduction isn’t big enough to account for that, then it’s less powerful.”
“Okay,” Taehyung nods, eyes drifting to a random location in the room, a sign of his brain processing the information, “okay, I get it. I think I get it now.”
Four questions later, all of which both of them get right, Taehyung finally gets his chance. He can’t help but cackle at the way Hoseok’s face falls when he realizes he’s done his calculations wrong, and Taehyung presses his own calculator to his lips.
“Off, my love, off,” Taehyung murmurs sitting on his knees, chest pressed against Hoseok’s side, lips against the shell of Hoseok’s ear, making the elder squirm when his tongue peeks out seconds later. “Take something off, now.”
“This wasn’t my fault, though!” Hoseok protests, hands come out to steady Taehyung’s hips when he almost stumbles back by wrapping around his waist. Using his hands, the elder tugs his lover’s hoodie down, fingers trailing down the portion of Taehyung’s butt the cloth doesn’t cover, unable to help himself from groping at the flesh. “It was the stupid calculator. I used the right formula!”
“Nope,” Taehyung shakes his head in glee, removing Hoseok’s hands from around him. “The calculator wasn’t wrong. You’re going to lose marks on the exam if you punch stuff in wrong as well. So come on, off we go with something.”
“Fine, then,” Hoseok slips off his bracelet, an anniversary present he’d received from Taehyung, and he smiles when he spots the exact same one glittering around Taehyung’s petite wrist.
“That’s a cheap move,” Taehyung announces, frowning down at him. “I took my jeans off for you.”
“One,” Hoseok holds up a finger, “you agreed to it. Second of all, you see this lack of shirt on my chest?”
Taehyung mutters under his breath about unfairness, before an idea strikes him, “I’m going to save up this turn, then.”
“Fair enough,” Hoseok shrugs, turning back to the work at hand. “Okay, what are the three assumptions of a repeated measures ANOVA?”
Taehyung nods his head as he moves away to write his answer, consulting his notes briefly when he finds something amiss. Hoseok waits for him to finish easily, and when he does, waves a dismissive hand, “This one’s easy, I’ll just say them out loud. So, normal distribution, independent of observations, and of course homogeneity of variance.”
“Wrong!” Taehyung exclaims pointing a finger. “Independence can’t be an assumption for this one. You’re making the same person go through all the levels, so you can’t assume that their observations will be independent for each level.”
Hoseok’s mouth drops open, and he flickers through his note, realizing Taehyung’s right, “What the third one, then?”
“It’s homogeneity of covariance,” Taehyung grins. “Now, now, hyung, what’s coming off, now?”
Hoseok groans, before he slips off his last ring, “I’m not taking off my jeans until all of this is off.”
“Why?” Taehyung whines. “I took mine off when you asked! Come on, that’s not fair.”
“Life’s not fair,” Hoseok grins, the smile slipping when Taehyung shrugs.
“Alright, fine, I’m gonna save this one up too,” Taehyung declares.
Hoseok huffs, but doesn’t protest against it.
Three new hickeys each later, all of which litter the planes of Hoseok’s stomach, Taehyung eyes his own abdomen and then shifts gazes to his forearm, smiling at the small mark blooming on there as he remembers how gentle and nonchalant the elder had been about that particular one. He had reached for Taehyung’s hand, tangling their fingers together without even having to look up while his voice explained to Taehyung exactly why he was wrong. He had brought his lover’s forearm close to his mouth while in the midst of speaking, and between pauses had repeatedly pressed soft kisses against it. Taehyung’s hadn’t been unable to stop staring at him, throughout, and had to ask his boyfriend to repeat the explanation, feigning confusion.
Hoseok’s voice interrupts his thoughts again when he asks, “How do you calculate F max?”
“You divide the variances,” Taehyung answers, not even bothering to write on his paper.
“Which variances? Be specific,” Hoseok says with a smirk, catching Taehyung’s eyes widening.
“Uh, the two…?”
“Nope,” Hoseok shakes his head, dropping the booklet on the table. “Check your notes.”
“Oh,” Taehyung mutters, flicking through them. “I don’t have my earlier lectures’ notes I think.”
“The largest by the smallest,” Hoseok supplies. “Off with another thing, my precious.”
“…did you just…?” Taehyung squints at the elder, who chuckles and nods, gesturing for him to continue.
He huffs, rolling his eyes, before slipping off their anniversary bracelet and asking, “Where?”
“Turn around,” Hoseok says simply, and Taehyung nods. He feels his lover’s hands slip underneath his hoodie, one hand holding the material up, while the other stands to trek lowers, fingernails pressed into the material of his boxers.
“Hey, you’re supposed to be kissing, not groping,” Taehyung complains when Hoseok’s fingers squeeze around his ass.
“Since when?” Hoseok asks, leaning forward and breathing onto the exposed skin, tracing the goosebumps with a thumb when Taehyung shudders and lean forwards to brace himself of his arms, papers crumbling underneath high tight grip of the edge of the table. He half expects Hoseok to pull away his boxers, and run his tongue or lips down his cheeks, but the elder moves higher up instead. Lips come into contact with his lower back, near the curve of his spine, and suckle softly. He arches his back, hands scrambling back to find purchase in Hoseok’s shoulder, letting loose a small whimper when his boyfriend starts to knead around the flesh.
“All good,” Hoseok announces brightly, pulling up, and patting Taehyung’s butt twice. “Looks pretty.”
Taehyung rolls his eyes, and settles back down in Hoseok’s lap, not moving even when the elder press his chin into his shoulder, asking him what he’s doing.
“Taking a break,” Taehyung replies, leaning back against the other’s chest, slouching down further until Hoseok’s chin rests on top of his head comfortably. “How many questions have we done?”
“We’ve finished 30,” Hoseok whispers softly in his ear, flipping through the review material. “Still got 20 more to go.”
Taehyung hums in response, sighing out in pleasure when Hoseok hands start to drift lower than his waist, tracing the skin of his thighs. He doesn’t have to tell the elder to stop this time around, though, and he’s surprised when Hoseok pulls at the edge of his hoodie, tugging the cloth down as far as it’ll go, adjusting it from the back as well.
“Do you have any questions?” Hoseok asks after they spend a few minutes in silence. “Anything you don’t understand?” Taehyung grabs his worksheets from the table, in response, leaning back into the warmth of the other’s chest as he flips through them, looking for something that confounds him.
“Covariance,” he says quietly. “What’s that?”
Hoseok frowns, reaching for his phone, “I know what it is, but I also don’t know what it is.”
“If I tell you what compound symmetry is,” Taehyung tilts his head up to look at Hoseok’s face upside down. “Do I get two kisses?”
“Why two?” Hoseok asks, sparing him a small smile.
“’Cause it has two requirements, so two kisses,” Taehyung reasons, voice quiet.
“Okay, I’ll give you two kisses.”
“On the lips, though,” Taehyung clarifies. “Not on the nose or chin or jaw or anywhere else, got it?”
Hoseok snorts, but nods in agreement anyway, “Sure, what’s compound symmetry?”
“It’s when you satisfy both the requirements of homogeneity of variance and homogeneity of covariance,” Taehyung recites with his eyes closed. “Can I get my kiss now?”
Hoseok chuckles leaning over to kiss the younger upside down, before murmuring, “Covariance essentially measures how two independent variables vary together. If one gets bigger when the other does too, covariance is positive and if one gets bigger while the other one gets smaller, that’s negative covariance.”
“So, it’s similar to correlation, then?”
“Yeah, correlation is like scaled down covariance,” Hoseok nods, tilting the younger’s head to the side to make joining their lips a second time easier.
Taehyung hums against his lips, shifting as asked, and coaxing the elder’s mouth open, enjoying the little noise Hoseok makes into his mouth when his hand drifts up to rub at Hoseok’s chest, fingernails trailing down and up his abdomen.
Hoseok’s breaks away first, lifting Taehyung off his lap, “We’re more than halfway through, come on, Tae, let’s finish this up.”
The younger nods, brushing his fingers through his hair, “Okay, read me the next question.”
“Alright,” Hoseok hunches over the desk, “this one has a graph and it’s asking if there’s an interaction between the two factors.”
Taehyung leans his chin on the elder’s shoulder, eyeing the pictures, before nodding his head, “There is.”
“Is there?” Hoseok frowns, looking at him. “I don’t think so.”
“No, the lines don’t intersect,” Hoseok points at the graph, turning to glance at Taehyung with furrowed eyebrows.
“That doesn’t always mean there’s no interaction,” Taehyung sneaks his left arm underneath Hoseok’s right one, and pulls the review sheets in his own hand, flipping to the answers. “Look, it says there’s an interaction.”
“Oh,” Hoseok frowns, “then there can be an interaction even without intersecting lines?”
“Mhm,” Taehyung nods. “As long as they’re not parallel, there should probably be an interaction. What’re you takin’ off? Jeans, right?”
Hoseok turns to give his lover a wide smile, “Still got a watch left, sweetheart.”
“I hate you so much,” Taehyung mutters as he presses his lips against Hoseok’s neck, the elder tilting it to give him space to mark up whichever spot he wishes. He sits up on his knees, body pressed into Hoseok’s side as he leans down to suck against the sensitive skin between the elder’s shoulder and neck. He smiles when Hoseok releases a breathy pant, eyes closed as his hand comes around to wrap around the younger’s waist.
“All done,” Taehyung whispers teasingly, pressing a small kiss against his boyfriend’s ear.
They whiz through the next three calculation questions easily, being careful with entering the right numbers into their calculators and using the proper formulas.
“Alright,” Hoseok says, rubbing at the fresh mark on the inside of his elbow, “what kind of ANOVA is the following?”
Their heads touch as they both lean down to read over the situations, and turning to each other with confused gazes.
“Repeated measures?” Hoseok asks, watching Taehyung as he thinks it over.
“I think so, too, but can you check?”
“It’s not,” Hoseok says once he does, “it’s mixed design. The players are between-subject because they’re being compared together even though they all go through each level.”
“Ah, okay,” Taehyung nods, pulling off the last ring left on his hand, frowning when he realizes he’s only got his boxers and hoodie left. He turns to his left to glance at Hoseok, noticing the presence of two socks still, and although he expects his boyfriend to pull one of them off, the elder unbuttons his jeans instead.
His eyes widen, meeting Hoseok’s, which wink at him, before the elder raises himself up and pulls them down, struggling a little to tug them off his knees. He succeeds after a few pulls, moving to sit crossed legged before tossing the cloth on the couch across the room.
He laughs when Taehyung’s gaze drops down, “Enjoying the view?”
The smile on his falls off, when Taehyung sits up on his knees, long fingers running over the firm thighs making Hoseok’s legs tremble, “Can I touch you, hyung?”
“Wait your turn, babe,” Hoseok tells him firmly, pulling Taehyung’s hand away, frowning it comes back.
“Remember how I saved up two marks earlier?” Taehyung’s grin is devious, but Hoseok’s breath catches in his throat when he looks up to stare at his lover, the sunlight from the setting sun painting his skin and hair a gorgeous warm tone.
He pulls the younger down by the chin into a soft kiss, murmuring against his lips, “You want to use them now?”
Taehyung nods eagerly, pushing Hoseok down onto his back, smiling when he leans up on his elbows to watch him. He starts off at the side of the elder’s left knee, pressing gentle lingering kisses that trail higher and higher slowly. His tongue darts out every now and then and he looks to see Hoseok looking at him with dark, hooded eyes, especially when he presses his mouth against the elder’s black boxers.
The elder doesn’t react too viscerally, except for the slight twitching of his thighs, letting out a shaky breath when Taehyung presses another kiss a little higher. Hoseok throws his head back, letting out a loud sound of pleasure when the younger’s tongue trails down the soft material of his boxers, encouraging Taehyung further. His thighs quake when the younger starts to graze his fingernails up and down the skin, hand slipping into his boxers for just the briefest second, but it's enough to make Hoseok arch under the touch and grind upwards into thin air.
Taehyung trails his hand up as well, at the response, palming at Hoseok through the material, and when he presses he presses his lips back down to the front of them, he feels the other's member twitch and then a dampness underneath this lips, “Are you wet for me, hyung?”
Hoseok curses loudly, scrambling backwards, as Taehyung’s voice breaks him out of the thoughts were clouding his head. When Taehyung follows, crawling up, Hoseok puts a hand against his shoulder, shoving him back and sitting up, voice several octaves lower, “Stop Tae, stop!”
Taehyung leans back in understanding, nodding to demonstrating his obedience at the request, sitting onto the balls of his feet, watching Hoseok breathe deeply and he runs his fingers deeply.
“I’m not…” Hoseok pauses, trying to put it as simply as he can, “I’m going to take you right here, work be damned. So, don’t do that again.”
“Two weeks huh?” Taehyung snorts, reaching forward to pull the elder’s face up, and giving him a deep kiss. He pulls away when the elder’s hands scramble to pull him closer by his hoodie, dancing away from his fingers. He stands up, walking around, smiling when Hoseok’s eyes trail after him. He settles himself behind Hoseok, fingers running down his spine, before he brings his mouth down to the elder’s shoulder blades.
“What are you doing?” Hoseok asks, sounding perplexed.
“I still have two places left, are you forgetting?” Taehyung asks, pulling his mouth off the elder’s skin with a smacking sound. He settles for the middle of Hoseok’s back for the second mark, and snickers when Hoseok straights out his back as his tongue grazes over the skin at the back. “There, done.”
Hoseok pulls him back in front of him, cradling Taehyung’s face in his hands, and pressing three firm pecks on his lips, “I’m sorry and thank you.”
“It’s fine,” Taehyung shrugs. “Not like we have a lot of questions left, right?”
Taehyung gives them matching hickeys, both of them now sporting marks right above their hearts at the next question he gets right and Hoseok gets wrong, after watching the elder pull of one of his socks. Having taken to sitting in front of the elder instead of beside, he smiles when Hoseok walks them through a question while his hands play with Taehyung’s foot underneath the table. Fingers run up and down his shins and rub the area around his ankle soothingly, Hoseok barely noticing the motions of his hands as his mind works through the problems presented in front of them.
He looks at Taehyung hesitantly after they both get a particular question right, and Taehyung wiggles his eyebrows when he comes around to find a different spot of skin to mark. He stays back for a few seconds, admiring the elder’s barely covered body that’s literally in spots, all varying shades of red and purple. When he reaches down, Hoseok stops him, and touch the back of his knees, “Can I mark you there?”
“Are you asking?” Taehyung looks at him incredulously, laughing when Hoseok frowns and pulls him forward roughly, until the younger is seated in his lap.
“I won’t do it if you say no,” Hoseok replies, fingers slipping under his hoodie to caress the skin around his hips.
“I liked you better when you didn’t ask for permission in regards to where to mark me, you know. I’m pretty sure if I don’t like a particular spot, I can tell you no and not have to worry about you either doing it or insisting to do it.”
“I’m gonna take that as a yes,” Hoseok grins, lifting Taehyung and pressing him down into the ground, knowing they’ll both end up with carpet burns. He traces his fingers up and down the back of Taehyung’s thighs, smiling at the way the younger shudders underneath him. He makes eye contact with Taehyung and when his lover nods, he starts to trail kisses from under his thighs all the way to the back of his knees.
His other hand makes work of caressing up the other thigh as he suckles onto sun-kissed skin, the motions of his hand drifting downwards when Taehyung’s hand presses his wrist in silent warning. He pulls the younger’s legs down, but not before pressing kisses to the spots on the inside of Taehyung’s he’d marked earlier, laughing when Taehyung moans out his name, “Ah, hyung…”
“I’m moving, I’m moving,” he murmurs pressing one last kiss before sitting up and lets Taehyung push him down.
“Stop me if you want,” Taehyung tells him, looking him straight in the eye, before he descends down and presses his lips against Hoseok’s thighs, lapping at the skin and then taking it within his mouth.
“Oh fuck, so that’s what that felt like,” Hoseok murmurs, hips canting up on their own.
“Don’t thrust up,” Taehyung chides him, pulling him before reattaching his mouth to Hoseok’s leg. “That’s weird.”
“I can’t help it,” The elder growls up, and when Taehyung’s hand starts to drift upwards, he grits out, “If you as much as touch me there, Tae, I swear to god, I’m going to do something very bad.”
Taehyung moves away, innocently grinning down, “I was just going to stop you from thrusting up by holding down your hips.”
“Uh huh,” Hoseok nods sarcastically, sitting up and pulling away, “because I totally do not know you.”
Taehyung’s giggle puts a smile on his face as they both move back to their original spots across from each other.
Taehyung’s eyes widen as he stares at Hoseok, “Three more questions left.”
“Three more?” Hoseok asks in amazement, looking down at himself. “I’m got two items left, what about you?”
“I do, too!” Taehyung grins, looking down at his hoodie which he had somehow managed to keep on the entire time.
“It’s unfair you never took that off!” Hoseok pouts. “So much surface area left untouched.”
“Untouched?” Taehyung raises a single eyebrow. “Do you see red as the same shade as my skin?”
He reaches down to grab the edge of his sweatshirt, tugging upwards until it’s primarily off him, only his arms remaining in the sleeves. Gesturing to his chest, he asks in an incredulous voice, “How is this untouched?”
Hoseok tries his hardest to not grin, eyes appreciatively raking over the blemished skin, tracing over the patters and designs in red and purple painted across Taehyung’s chest. He presses the heel of his hand into his lips, coughing a little to cover up his laugh, “It’s…not so bad?”
“You’re right, this isn’t so bad,” Taehyung says nodding slowly, in a threatening manner as he leans forward, inches away from Hoseok’s face, “because tomorrow, I’m going to show you the meaning of bad.”
“Can’t wait!” Hoseok chirps, closing the distance between their mouths briefly, before pulling away. “Provided we don’t screw up on the next three questions.”
“Okay, so, what’s the rationale behind doing follow-up tests?” Taehyung reads out loud, frowning once he does.
“What is it?” Hoseok asks him, face blank.
“Do you know?”
“Yeah,” Hoseok frowns. “Seriously Tae? We spent so many lectures on all the different types of follow-up tests, and you don’t know why we do them?”
“I don’t know,” Taehyung shrugs, looking down at the table, fiddling with his papers. “I mean we’ve been doing ANOVAs the entire time, but I still don’t know why we do them.”
“It’s to test whether the means are significantly different,” Hoseok answers him, crossing his arms.
“Oh, right,” Taehyung doesn’t look up to meet his eyes. “What about follow-ups?”
“They’re to test exactly where the difference lies, Tae. The means of three groups can test out to be significantly different, but then you have to test it all further to determine exactly which ones are different.”
“Right,” Taehyung says quietly, still not looking up as he quietly slips off his hoodie, feeling a shiver go through his body. He’s forced to meet Hoseok’s eyes when he turns back around, and asks, “Where?”
Hoseok eyes soften and he pulls Taehyung forward by the arm, before leaning the rest of the way himself, and pressing his lips against the younger’s forehead. He whispers an apology against the skin, moving back to ask, “That counts, too, right? I don’t necessarily have to bruise your skin?”
Taehyung nods, giving the elder a smile, extending his hand forward to intertwine their hands, and squeezing softly.
“What’s the formula for familywise error?” Hoseok reads out loud, starting to write his answer down on the paper in front of him before his eyes drift to their joint hands, looking to pull away to allow Taehyung to write his own answer. The younger makes a noise when he tries, and he chuckles softly when he sees Taehyung finish up the answer with his left hand, murmuring to himself, “ambidextrous people.”
He misses the way Taehyung’s head lifts up, giving him a soft smile, only looking up when he’s done writing. They match their answers, both of their faces sporting wide smiles, as Taehyung grins, “One more question. You better not have any plans with anyone after our exam ends.”
“No worries, love, you can have me for the entire day.”
“And night,” Taehyung adds, picking up the booklet to glance down at the last question. “Okay, so when do you use linear contrast versus a t-test?”
Hoseok’s eyebrows furrow when he scribbles down his answer, exchanging it with a beaming Taehyung who also frowns when he reads his answer.
“Hyung! Both of those are a priori tests and theory driven, that’s not the difference!”
Hoseok reads through Taehyung’s answer twice, looking up with a sheepish smile, “Sorry?”
“You ruined everything!” The younger exclaims bunching up all their papers and tossing them at Hoseok. “Why do you have to ruin everything?! Tomorrow, we were supposed to –”
“Wait, wait, wait!” Hoseok yells out grabbing Taehyung’s biceps, having to stand up to restrain him. “I still have a sock left!”
Taehyung stills in the midst of throwing papers immediately, a few falling from.his hands, glancing down at the elder’s right foot, noticing that yes, indeed, he still does have a sock left. He looks up at Hoseok with wide, happy eyes, grinning when the elder holds onto him to balance, slipping a finger into the edge of the sock and pulling it off. He steps over the table, putting one foot forward as he leans to kiss Taehyung and the other naturally follows through.
The younger’s arms wrap around his neck, before he wraps one leg around Hoseok’s waist, pressing their fronts together and then wrapping the other leg as well. His lover strains his neck up to meet Taehyung’s mouth, walking them forward until Hoseok’s knees meets the couch and he tosses Taehyung on it, climbing on top seconds later, and coaxing his mouth back open. He moves down, trailing his lips down the younger’s neck and then his chest, playing with his nipples before moving further towards his stomach, unable to keep himself contained long enough for elaborate foreplay.
Taehyung, feeling much the same way, scoots backwards as well, spreading his legs and hooking one over the back of the couch to accommodate Hoseok in between him. He keens when Hoseok’s mouth presses to the front of his boxers and the elder laps at the material before he pulls off and slips the restricting cloth off.
He grins when the younger lets out a sigh of relief, his straining member curving up against his stomach, and Hoseok takes it in his hand, stroking it slowly. Taehyung cries out, tugging at his hair, urging at him to go faster, “Harder, shit, go HARDER!”
Hoseok chuckles, but he increases his pace, gathering the pre-cum that beads around the tip and spreads it down to make the slide easier. A few strokes later, he descends down on Taehyung, going as far as he can without choking, pulling off when Taehyung starts to thrust up. He presses a hand in warning against his hips, muttering a quiet “behave” before taking him back into his mouth, hand stroking whatever his mouth doesn’t reach.
He alters his speed between the bobs of his head, enjoying the younger’s mewling, the sounds falling out of Taehyung's lips making his own erection strain against his boxers. Taehyung starts to thrust up again, and by the way his voice breaks, Hoseok realizes he’s close. Crying out when the elder pulls away, Taehyung leans up to find Hoseok hastily shedding his own boxers, and he grabs the elder’s hips pulling him closer. He moves up and makes Hoseok sit back straddling hit and starting to stroke both of them, together, burying his face into Hoseok’s marked up shoulder, breath coming out in pants. Hoseok’s hand wraps around both of them, as well, covering what Taehyung's doesn't, moving up and down swiftly as he grips them both together tightly.
Taehyung moans at the sensation of them touching, biting down at Hoseok’s chest right above where he hears the elder’s heart thudding in his chest. Pulling Hoseok down for a kiss, he swallows up his lover’s moans, their breath intermingling as Hoseok strokes them harder. The elder’s hand pauses, thumbing at Taehyung’s slit, and a few strokes later, Taehyung comes with a cry, his entire body shuddering through the after shocks as Hoseok milks him dry, while he paints both of their chest white. Despite still in the midst of his recovering, Taehyung hand finds Hoseok’s member, stroking him before leaning down to settle himself on his knees between the elder’s legs.
He pulls the straining, red erection in his mouth, making Hoseok moan and throw his head back against the back of the couch. The younger starts to bob his head up and down fast, lapping at the slit as pre-cum leaks from it, and then sucking at the tip harshly. Hollowing his mouth, he increases his pace, when Hoseoks's hips stutter, moaning around his lover to send vibrations through him, and a few seconds later, the elder releases in his mouth with a loud cry, continuing to writhe under his mouth as Taehyung doesn’t stop moving his head up and down. He pulls of with a pop when Hoseok’s pushes at his shoulder, catching the bits that drip out of the corner of his mouth with his fingers, making a show of licking them clean.
Hoseok laughs a little when he pulls him back up for a kiss, breaking it when his own cell phone starts to ring this time. Taehyung frowns, falling limp against the couch, when Hoseok goes ahead to pick it up, “Hello?”
“Ah, hyung,” Jungkook’s cheery voice filters through the phone, still sounding rather nasally, “we bought pizza and drinks already. We’re like five minutes away, so don’t order any food, okay?”
“Oh,” Hoseok’s eyes widen and he turns to glance at Taehyung. “Five minutes? Okay, great, we’ll see you in a bit then.”
Taehyung groans even when Hoseok grabs his hand and pulls him to sit up, “I don’t wanna get up! Tell them to come back in fifteen minutes.”
“Wipe yourself, goodness,” Hoseok shoves a bunch of tissues in the younger’s hand, pressing a kiss to his forehead, “and can you open the window?”
Taehyung makes a loud wailing noise, but he does as he’s asked to, watching Hoseok frantically rush around to grab their clothes, “I don’t think you should put that shirt on, hyung, unless you want them to know exactly what we were up to.”
Hoseok considers this, nodding, before heading to their bedroom to get new clothes. He returns in a new pair of boxers, tossing another at Taehyung, before grabbing his jeans and slipping them on. He pulls on a dark navy blue hoodie, next, putting on his belt as well, and then sprays heaps of air freshener everywhere.
“God, I’m going to die,” Taehyung says, as he starts to cough, pulling on the boxers Hoseok has given him.
“Put your clothes back on, please,” Hoseok pleads with him, grabbing his hoodie off the couch, waiting on him as he sits down to slip on his jeans. He moves forward once Taehyung done, slipping the top over Taehyung’s head, letting him slip his arms through later. They both kneel forward grabbing their rings and accessories off the desk, and Taehyung helps hook the choker back on around Hoseok’s neck, frowning.
“Does the mark show?” Hoseok ask, presses his fingers against the column of his neck.
“It’s fine, I only see it, because I know it’s there,” Taehyung reassures him, moving around the table to gather the paper’s he'd thrown at the elder minutes ago. They settle back down into their previous positions, giving each other a once over to make sure they don’t look too suspicious.
They both tense up when there’s a knock on the door, and Taehyung rushes over, opening the door and grabbing the pizza boxes out of Jimin’s hands before ushering both him and Jungkook inside.
“Does it smell weird in here?” Jimin asks, nose scrunching as he looks at Jungkook, who shrugs. Hoseok holds his breathe, exchanging a look with Taehyung, “kind of like fresh laundry?”
“How is that a weird smell?” Jungkook rolls his eyes. “I wouldn’t know though – can’t smell a thing.”
“Oh, it’s a new scent,” Hoseok grins as he waves around the bottle of air freshener at Jimin, watching the younger’s face relax as he moves forward to take a seat beside Jungkook who’s sitting across Hoseok. “They ran out of the citrus we normally use.”
“Ah, that’s why,” Jimin nods in understanding, smiling and gesturing at Taehyung to take a seat as well. “We bought your favourite pizza.”
Taehyung grins widely at his best friend, giving him a hug across the table, “Thanks!”
“You’re really studying, huh?” Jungkook looks between the two of them and the papers sitting around the table. “Jiminnie hyung was convinced you were up to weird stuff. That’s why he said to call and give you guys a warning.”
Hoseok lets out a laugh of relief, exchanging a look with Taehyung who presses his lips together and looks at Hoseok with a blank expression. He turns back to Jungkook and says, “Oh yes, we’ve been studying. Did you know I’m a type II error?”
The younger’s face falls, expression turning confused as he stares at him with narrowed eyes, “Excuse me?”