Work Text:
When people talk about Riku, Yushi's name would get mentioned. That's how often they're seen together as an inseparable duo. Some people mistake them as a campus couple, but in reality, they're simply best friends. A unique friendship between an alpha and an omega who looked like they’re dating but aren't.
It's the kind of friendship that most people would find strange, because they kiss as if they're lovers, hold each other as if they've been apart for weeks, and share silent conversations when they're with friends. It feels intense for a random bystander, and it feels awkward for their friends to point it out, but both of them just don't care .
It doesn't help that Riku’s friends seem to know the amount of times Riku has ditched his exes for Yushi. A single phone call or a text is enough for Riku to drop everything for Yushi's sake. Sometimes, they wonder if Yushi realizes how much Riku loves him. And they wonder if Riku will ever admit the amount of feelings he has.
But Riku still refuses to tell Yushi the truth. It's not because he's scared of rejection or because he doesn't want to ruin their friendship, he just thinks everything is fine as-is. As long as Yushi remains by his side and doesn't fall in love with some random alpha, he’s happy with their friendship.
For Yushi, he doesn't think that their friendship is normal either. He thinks that it's strange when he compares it to his other friendships. After all, It's not like he kisses his other friends or hugs them repeatedly. Nevertheless, kissing Riku feels natural to him. Like a daily habit that feels nice to do.
The only rule he has is that Riku can't kiss him if he's currently dating some omega. Riku seems to find the complaint to be valid, and ends up breaking up with most omegas before the month ends. As if he can't last a month without wanting to kiss Yushi again. It’s really an addictive drug for him.
And things remain the same until one day Yushi's doctor tells him that his pheromone levels are too low due to a side effect of his suppressants. He's been using the same one ever since he presented as an omega when he was fifteen years old. The doctor ends up giving him a lighter prescription, and suggests that he soon finds an alpha he can scent with so it’ll help raise his pheromone levels.
Yushi only told Sohee about his problem since they’re both omegas, which is why he’s surprised that Riku found out about it. The alpha is bothered by the idea that some other alpha will be scenting his omega.
“You can’t,” Riku says adamantly as he follows Yushi from behind as the younger one walks to his class. “If you’re going to scent with someone, you can only scent with me,” he says with a tone of finality.
“But he said I should do it through skin to skin contact,” Yushi slightly pouts as he faces the elder all of a sudden. “Won’t it be embarrassing between us?”
“Embarrassing?” Riku asks while raising an eyebrow before smiling. “Why would I be embarrassed when it’s you?”
“I don’t know… he made it sound like I should do it with an alpha I like…”
“And you like someone…” Riku starts to say slowly, feeling the anger slowly boil within him. His eyes change from brown to dark red, a sure sign that he’s affected by this recent news.
“No! I just mean…” Yushi starts to say before blushing a little. “If we scent each other, then won’t I become your ‘lover’? Or are you still going to date other omegas…” he trails off with a hesitant tone.
“Of course not,” Riku immediately reassures his omega as his eyes turn back to brown. “Why would I date other omegas if I’m scenting you? They'd hate the fact that you scented me and they can't smell my scent anymore.”
“I don’t know,” Yushi shrugs as he lets Riku take his hand and intertwine their fingers. “I just thought that you might get bored with just scenting me. That you might want to kiss someone else or something like that.”
“Nah, I could never get bored,” Riku says reassuringly. “But I suppose I'd need more than just one kiss per day.”
“More than one?” Yushi tilts his head.
“Hmm,” Riku pretends to think about it before deciding a good amount. “Yeah, I think I should get more than one kiss per day. What if you kiss me in between classes too? Or when we meet with friends? It's only fair if you're gonna be my lover.”
Yushi blushes at the suggestion, feeling shy at the idea of kissing Riku more than once. But he doesn’t hate the idea of doing that since he likes kissing him.
“Okay, but you can’t complain if I suck at it,” he ends up telling Riku with a small huff. “You have more experience than me…”
“Of course not,” Riku promises before leaning in close to Yushi’s face. “Can I get that kiss before you go to class then?”
Yushi’s ears turn red at the suggestion, but he’s not embarrassed to cup Riku’s face and softly kisses him on his tantalizing lips. He lets Riku wrap an arm around his waist as the elder kisses back. Yushi feels a little warm from the sensation, thinking Riku will slip his tongue inside, but the elder pulls back slowly. He stares at Riku’s yellow eyes as the elder licks his lips in satisfaction.
“See you after class,” Riku says softly before he lets Yushi go so the younger can leave.
Yushi doesn’t remember how he ended up in class after that kiss, too busy daydreaming about Riku’s lips without meaning to. He knows he shouldn't be thinking about these things in public, but he somehow misses Riku already.
**
The first time they scented is during the weekend when Yushi is off from his part time job. Riku comes over to his apartment, which is shared with Sohee, and brings some take out food so they can enjoy the day without leaving the building.
The concept of scenting is simply letting Riku lick and kiss a mark into Yushi’s scent gland. He will possibly mark the gland on Yushi’s neck if they don’t want the sensation to be too arousing. For lovers, they usually chose a scent gland that’s more sensitive, like in the inner thigh or on the nipples. This is because the sensitivity of those scent glands can cause an orgasm if the person is skilled enough.
The scent glands are usually small bumps with a small opening that excretes the person’s pheromones. By licking the glands, it’ll cause the gland to absorb the alpha’s scent and alters the omega’s pheromone to only affect that alpha. It’s usually a method used by possessive alphas to make sure their omegas don't attract other alphas. It’s no surprise that Riku finds this method to be favorable since he doesn’t want anyone to steal his Yushi away.
One day, Riku hopes to be able to lick all of Yushi’s glands without worries, but today, he'll just aim for the neck.
“You probably have done this with so many omegas already,” Yushi comments nervously as they face each other on the couch.
“Nope, I haven't,” Riku reassures him. “Scenting is a big deal to me, and I didn't want to do that with some random omega.”
The elder scoots closer as he places a hand on Yushi's thigh.
“... So you were saving it for your future omega?” Yushi asks, feeling surprised. “Then you shouldn't be doing this with me.”
The younger one looks worried as he sulks at Riku. Even as he says that, he feels a little sad at the idea of Riku finding another omega to be with.
“But you’re special to me,” the elder tells him as he caresses the younger's thigh and purposely travels his hand closer to his dick. “I want my first scenting to be with you. I don't want to give it to someone else.”
“You don’t?”
“Mhm,” Riku confirms before leaning in to kiss Yushi while squeezing his thigh gently. He's purposely trying to entice Yushi slowly. “Wanna give all of my firsts to you.”
Yushi is too distracted to understand the meaning behind those words. Riku is already licking his lower lips and forcing him to lie down on the couch.
The elder hovers over him with yellow eyes, a sign of his arousal. It only becomes dark yellow if Riku is in a rut or if he's going to mate an omega. But the idea of knowing Riku is turned on is giving Yushi the confidence to not worry. As if he's happy that he can make Riku feel that way.
“Can I take your top off now?” The elder asks breathlessly.
Yushi nods shyly as he gazes at Riku. The elder thinks Yushi is the cutest when he's like this. Very pliable and innocent under him.
He doesn't tease Yushi though when he takes off his shirt. He slowly pushes it upward, fingers tickling Yushi's sides, and he gazes with hunger as he sees more of Yushi's pretty skin. The light red nipples that beckon him, the flat, soft stomach that he wants to bite, and the wide hips that will one day help carry their pups.
Riku aims for that future, but for now, he'll just slowly seduce him.
He kisses Yushi's stomach without asking, causing the younger to squirm, feeling ticklish by the sensation.
“Riku…” the younger one whines a little. “That's not where my scent gland is…”
“You're right. Should I start with your nipples then?” He asks teasingly despite sounding a little serious.
“No!” Yushi squawks with red ears. “You can't! Just my neck.”
“But I want to scent your nipples one day,” Riku pouts childishly as he caresses Yushi's thigh again. “You'll let me do that, right?”
“But… it'd feel too good…”
“I know,” Riku leans down and kisses his collarbone before trailing upwards. “Don't you want me to make you feel good? And give you a scenting orgasm?”
“Scenting orgasm?” Yushi asks breathlessly. “What's that?”
“An orgasm by sucking your cute nipples,” Riku says a little crudely. “I bet they taste as good as your slick.”
The younger one blushes heavily at Riku's words, thinking how naughty that sounds.
“Th… they're not tasty,” Yushi whines softly. “It's not like there's milk coming out of it…”
“Should I breed you tonight so I can milk you one day?” The elder teases, licking his lips as he thinks about that future.
A swollen belly Yushi would look so pretty riding him every night. Not to mention the amount of milk he'd taste every night until their pup is born. Just thinking about it makes Riku’s cock strained against his pants. The elder wishes he can fuck his cute Yushi tonight, but he reminds himself to be patient.
“Y… you can't! You'd have to claim me if you're going to do that,” Yushi argues while squirming.
He's starting to feel his slick seep out and it's making his boxers a little wet. He’s not new to this feeling, he usually gets turned on whenever Riku kisses him too long. But the fact that he feels so wet is making him wonder if it's normal to feel this wet during scenting.
Maybe it's because it's Riku that he feels more aroused than usual. After all, the elder has always made him feel different than usual.
“Should I claim you then?” Riku asks in a rather serious tone. His eyes are slowly turning to dark yellow, which seems impossible because he's not in a rut, or that they're planning to fuck. But it seems like both of their pheromones are compatible enough to cause a high arousal.
Yushi shivers under Riku's gaze, as if his body instinctively replies to Riku's request. A glob of slick comes out from his wet hole and he clenches emptily. His brain is yelling at him to accept Riku's request.
“But not tonight,” Riku says softly in the end. His eyes turn back to normal yellow. “One day, I'll claim you,” he says his intention clearly, as if sealing their fates together without waiting for Yushi's consent.
It should feel wrong to hear that, and he should question himself if he wants Riku as his mate. But maybe, instinctively, he already knows that he wants Riku as his mate. As if he can't imagine kissing or loving another alpha besides Riku.
Maybe that's why he's acting like a virgin slut under Riku, purposely seducing him with his wet hole and red nipples. He's barely putting up a guard against an alpha that could force him into mating.
And he doesn't fight back when Riku kisses him intensely. The elder holds the younger still as his mouth travels down to Yushi's neck, trailing soft kisses before finding that swollen scent gland.
It's one lick to make Yushi gasps loudly and another lick to make Yushi mewls in sensitivity. Riku softly bites against it before licking it again while keeping Yushi's hips still. It only takes a few minutes, but the effect of scenting causes Yushi to pant in arousal.
He feels too tense, as if he needs something to be released, and Riku can sense it too, seeing how his eyes are turning dark yellow again.
“Riku, help me,” Yushi whines against his ear as the elder nuzzles his nose against the scent gland.
“Hmm, after you scent me,” the elder says without remorse.
He purposely pulls Yushi upward, ignoring the pretty pout, and pulls him right on top of his lap.
Yushi can feel the extremely hard cock under him, and he grinds his ass against it, wondering what it'd feel like to have that cock inside of him. He's seen his erection before, by accident, when he caught Riku masturbating in his room, so he knows it's too thick for his tiny hole. But he still wonders how it'd feel after reading so many stories of omegas getting knotted by their alphas. It seems so debauchery and sensual, but Yushi secretly envies them.
That's why he doesn't hesitate grinding against it, letting his wetness seep through his pants and drip into Riku's sweatpants. He's half panting and half whimpering, wanting his release, but Riku stops his hips when he finds a good position.
“Scent me first and I'll let you grind against my dick again.”
Yushi whines loudly, hating the request despite understanding that he should scent Riku too. He can't let some inferior omega scent his Riku. So he licks his scent gland without kissing it first, impatiently and hornily. He grazes his teeth against it, feeling happy when Riku groans loudly in reaction, and he sucks on it sloppily, wishing he can make a mark on it.
Riku palms Yushi's ass in reaction and squeezes it, purposely rubbing his fingers against the wet part of his pants.
“How do you want me to help you tonight?” Riku whispers to his ear after Yushi is happy with his mark. “Should I finger you or touch your pretty cock?”
The younger licks his lips at hearing those words, weighing both options before deciding he wants those thick fingers inside him.
“Fuck me with your fingers,” Yushi says impatiently.
“... Go back to your room and strip ,” Riku growls at him before slapping his ass in punishment.
Yushi still considers that night to be one of his best orgasms.
**
After that first scenting, their relationship changes drastically . As if whatever boundaries they set as friends who kiss sometimes, it becomes lovers who scent and touch each other's cocks. And the days of shy Yushi are no longer a reality since the younger is slowly becoming a perverted Yushi. He touches Riku's cock when their friends aren't looking, and begs Riku to finger him when they're making out in a friend's bathroom.
It's no surprise that they always end up in the same bed at night time. And they wake up in each other's arms after a night full of scenting and kissing.
This morning shouldn't be any different than their other mornings. Riku fingered him the night before, with his 2 fingers rubbing against Yushi's prostate and causing him to cum within a few minutes. He passed out after that, but he remembers feeling Riku licking his hole and cleaning up his slick.
That's why he's surprised that he's still wet. Usually he’s only slightly wet, but this morning, it's like he's drenched. Like he can easily fuck 4 fingers of Riku without prepping himself.
Maybe that's why he's more bold as he grinds against Riku’s hard cock. The elder only lets Yushi rub the tip, and sometimes, Yushi helps Riku cum with his hands. But the elder doesn't let Yushi suck it yet, claiming it's too big for Yushi's tiny mouth.
This morning, he's somehow obsessed with how thick it feels against his ass. He wishes he can feel it inside him one day but he knows they should wait until claiming day. Because the chances of pregnancy are high once Riku's cock enters him.
It's why he's somewhat patient but also anxious to have it one day. He trusts Riku to keep his words, that the elder will claim him one day and they can finally have sex anytime they want.
He just doesn't expect his grinding to wake up Riku accidentally. The elder sounds groggy, but also turned on by how deep his voice sounds.
“What a slutty omega I have,” Riku groans into his ear. He grabs Yushi's boxers and starts to slip it off without permission.
“I’m not,” Yushi whines back, half lying and half telling the truth. He is horny, but he didn't mean to behave like a slut in the morning.
He just wanted to feel good again.
“As punishment, you'll let me use your slick,” the elder says before flipping Yushi into his stomach and raising his ass high in the air.
He parts the pretty ass and stares down at the tantalizing wet hole. He doesn't hesitate sliding his cock against the wet hole, groaning at the pleasurable sensation.
“Riku,” Yushi squirms underneath. “You can't fuck me before claiming me,” he reminds the elder despite feeling horny enough to want that inside of him.
“I know baby,” Riku says soothingly. “I'm just going to grind against your hole until I cum. I won't fuck it.”
“Okay,” Yushi trusts too easily.
That's how Riku starts to slide his dick in between Yushi’s ass, feeling the wetness coat his dick. He sets a fast rhythm, ignoring how Yushi can't keep his posture still. The cockhead slides too deliciously against Yushi's swollen hole and sometimes, it'll tug against it, as if wanting to enter but it has no permission. And everytime it happens, Yushi moans loudly while Riku grunts with closed eyes.
Neither actually pays attention to the possibility until a hard thrust has somehow lodged Riku's cockhead into Yushi's hole. It's only a few centimeters in, but the stretch feels wide enough to make Yushi claw the bed. It's too big and it feels uncomfortable, but damn if Yushi didn't like the idea of having Riku’s cock inside of him.
“Riku!” Yushi gasps out loud, trying to tell him to stop.
“It's okay baby,” Riku gasps also. “It's just the tip.”
He pulls out immediately, noticing how Yushi whines at the loss of contact. He knows Yushi will give in if he plays his cards right.
“That felt so good though,” Riku whispers to his ear, rubbing his cockhead against the entrance again before pushing in again.
“Nooo,” Yushi whines again despite pushing his hips backward. The stretch feels slightly less uncomfortable than before, as if his hole is slowly adjusting to Riku's cock. It feels just right.
“Please baby. Let me just fuck you with the tip,” Riku begs prettily while rubbing Yushi's body with his hands, purposely brushing his fingers against Yushi's sensitive nipples. “Just the tip, okay?”
He rocks his hips a bit more as more of his length slowly enters. He's still not pushing it all in for Yushi's sake, but the sensation is amazing .
Yushi can only pant as his eyes become a little teary from overstimulation. He's starting to not care anymore as he squeezes against the cockhead. Right now, it's stretching his hole in a good way and rubbing sweetly against his swollen entrance. But it’s still not giving him the pleasure that omegas like to talk about.
“See, you're starting to like it,” Riku tries to convince him as he thrusts gently again, grinding downward as he tries to find Yushi's prostate.
It doesn't take him long as one thrust causes his cockhead to brush against it, and Yushi moans loudly without restraint. It's then that Riku knows where to aim, purposely grinding downward and licking Yushi's neck before marking it with a temporary bite.
Neither of them seems to remember that Yushi can get pregnant from this mating. Or that having sex with an unmated omega might cause Yushi to crave Riku even more. It's simply a side effect of his omega wanting to tie down his prospect alpha.
Nevertheless, it doesn't take long before Yushi climaxes with a loud tearful shout. Riku groans at the sensation of Yushi's hole pulsing against his cock, and it's only then that he pulls out. Some of his cum sprays out as he pulls out, not caring that he might have cummed a little inside Yushi. He's only happy to get his release as he pulls Yushi into his arms and nuzzles his nose against his hair.
Yushi whimpers softly, yawning before taking Riku's hand and holding it tightly.
**
After what happened that day, Riku has somehow convinced Yushi that sex is okay as long as there's no knotting and that he ejaculates outside. Yushi was at first not convinced, but after realizing that he didn't get pregnant from that first mating, he starts to wonder if it's true.
It's probably why he lets Riku fuck him now, this time he can put in almost Riku's entire length without much effort. They soon learned each other's favorite sex position, as well as their favorite kinks. For Riku, he prefers bending Yushi in half because he likes watching Yushi cry under him and have the younger beg for release. And for Yushi, he likes being in Riku's lap, riding him cowgirl style because his cock reaches a certain spot that makes him cum too easily.
It's probably why Riku purposely chooses Yushi's favorite position tonight. He's deep inside Yushi, feeling his cockhead bump into something spongy. He knows that it's the opening of his cervix and that he can easily impregnate Yushi if he just ejaculates right now. But he takes their promise seriously, to wait until their claiming day.
At first, Yushi thought Riku wanted to wait until the younger one graduated, but Riku thinks that's too long. He's not risking some alpha stealing Yushi when he’s no longer around. So they compromise for the end of the year. This way they can both adjust to understanding each other's emotions through their bond, and they can fuck for days without worrying about classes or exams.
It's still a few more weeks until then, so Riku is trying his hardest to not mess up their promise.
But still, fucking Yushi raw is one of the best feelings in the world. Especially the way the younger squirms in his lap, leaning against him while moaning like a true slut. He's grinding down as if he wants to plug his hole with Riku's cock.
It doesn't help that Riku can hear how wet Yushi is. Every squelch reminds him that his omega is unbelievably wet for Riku's pleasure, and every time his cockhead nudges against the cervix, he thinks about breeding Yushi with his pup. And when Yushi tries to get away from oversensitivity, it makes Riku feel powerful, as if he's the only one who can make Yushi succumb to mind blowing pleasure.
Despite knowing he can't breed Yushi yet, it doesn't mean he can't tease Yushi. That's probably his favorite part of fucking this tight hole.
“Baby, how many pups do you think we can make tonight?” Riku grunts into his ear. “Should we make four of them at once?”
Yushi whimpers at a particularly hard thrust, hating how Riku purposely jab against his cervix.
“Or should I just breed you every year? Keep you pregnant and barefoot for me.”
“Nooo,” the younger whines. “Don't wanna.”
“Don't want what?” Riku frowns, halting his movements for a while.
“Not every year,” Yushi pants out, looking backward at his future mate while rubbing his own hard cock.
“Why not?” Riku asks teasingly, kissing his neck before smacking Yushi's hand away. The younger is only allowed to cum from Riku’s dick instead of from his hand. “You love sex. I bet you'll love being knotted.”
He makes a point by grinding his semi-formed knot against Yushi's hole. It pops in easily, stretching his entrance too widely, causing Yushi to whine and trash against the elder.
“Relax baby,” Riku whispers as he caresses his hand against Yushi's scent gland in his thigh, spreading his legs wider. “Your body is made to take in my cock and my knot,” he reminds him as he grinds against the entrance.
Yushi whimpers as tears flow out, feeling himself cum weakly as watery cum shoots out and sprays against his chest. He can feel Riku's cockhead pressing against his cervix now. He knows that if the full knot goes in, the tip will immediately push inside his cervix and spray his seed inside, searching for a viable egg.
Just the mere thought of Riku accidentally breeding him is making him more wet and he moans weakly as he lets his body give in to the pleasure.
Riku himself thinks he won't last long. If Riku was more selfish, he'd definitely breed Yushi, making sure it takes before leaving his omega alone. Luckily, he cares about Yushi's feelings, so he pulls out as his orgasm approaches. His cum immediately sprays out as soon as his cock comes out, spraying against Yushi's stomach and thighs.
They pant against each other as Riku rubs his cum into Yushi's thighs, rubbing it into his scent glands. Yushi squirms from the overstimulation, but lets Riku scent him using this method. It's one of those scenting methods that possessive alphas use because it'd make Yushi secrete Riku’s pheromone, repelling any other alphas that try to approach him.
Yushi still doesn't realize the difference yet. He only likes the fact of having Riku's cum rubbed into his scent gland, making him delirious with pleasure.
By the end of the scenting, Yushi yawns sleepily as he lets Riku lay him down on his back. The elder will now clean him slowly, licking and sucking the mixture off his swollen hole, making sure it's no longer slippery. He even licks the cum off Yushi's cock, sucking the cockhead clean. He then takes a warm, wet towel and wipes down Yushi’s body, purposely avoiding his scent glands.
And when Yushi is in deep sleep, Riku licks Yushi's nipples, sucking it softly, and grazing his teeth against the bud. He circles the bud teasingly, pressing his tongue against it before sucking it again. He claims he's just scenting him, making sure that all of Yushi belongs to him, but in reality, he's just waiting for the day he can taste milk out of it. Fuck , he can't wait for that to happen.