Chapter Text
To Senku's complete and utter surprise, Hanahaki was still a disease in the Stone World, and of course, Chrome had it.
Who else would have it? The guy was dangerously in love with Ruri, and it was only a matter of time before it developed if he caught it. Back in the modern age, everyone knew that if you kept your feelings secret for long enough, you were bound to develop the disease at some point.
Hanahaki was a contagious virus, but the disease didn't develop unless there was an excess production of pain-related love hormones. The virus thrived on those, and if they weren't present, it'd die off. Overall, it was a strange illness but equally dangerous. It could easily become fatal if it spread to other parts of the body, and it was ten-billion percent a death sentence if it spread to the heart.
That's why, when Senku saw Chrome coughing up blood-speckledflowers, he knew he had to say something. He wouldn't let this kid die because of some stupid crush.
"Chrome," Senku said sternly.
Chrome blinked, wiping some blood from his lips with the back of his hand. "Y-Yeah?"
Senku looked Chrome up and down, crossing his arms. "You know what that is, right?"
Chrome nodded. "Yes… We, um, we call it the 'flower disease'."
"Do you know why it develops?"
Chrome gulped. "Love…"
Senku narrowed his eyes. "I'm guessing you know what you need to do then?"
Chrome sighed and shook his head. "Yes, but… What if… What if Ruri–"
"That doesn't matter," Senku cut him off. "I can guarantee you that little princess is head over heels for you, Chrome."
Chrome flushed brightly. "R-Really?"
"Yes." Senku sighed and rolled his eyes. "It's quite obvious, if you ask me."
Senku had not even an inkling what romantic love felt like, but even a science-obsessed, loveless guy like him could tell what Chrome had been feeling all this time. Honestly, it made Senku slightly sick. Love was just a way for humans to reproduce, and he had no interest in that. Child rearing was one responsibility he'd never take upon himself – he was not fit for something like that. Therefore, he had no interest in romantic love.
Chrome's eyes brightened. "Okay… Okay! I'm going to do it! I'm gonna do it, Senku!"
Senku chuckled. "Alright. Go get 'em, tiger."
—
The next day, it became public knowledge that Ruri and Chrome were romantically involved. The entire village was cheering and having a good time, celebrating how their princess had just gained a partner and possible future husband. Unsurprisingly, when Senku checked on Chrome's condition, the Hanahaki was almost completely gone.
Senku sighed and rubbed the back of his head. Out of nowhere, Gen approached from behind him. "I wouldn't be wrong to guess that you were involved in this, Senku-chan?"
"Yep. You'd be surprised to hear the reason why."
Gen smirked. "I have time."
"Would you believe me if I said that Hanahaki is still a disease centuries later?"
Gen's eyes widened. "Wait, really? Are you sure?"
"Ten billion percent." Senku pointed in Chrome's direction, who was currently leaning on Ruri and laughing amongst the other villagers. "I caught that guy hacking up flower petals yesterday. Only one conclusion can come from that."
Gen chuckled nervously. "Huh…"
Senku rolled his eyes. "It looks like we have another thing to watch out for in this Stone World." He patted Gen's shoulder with a shrug. "Who knows. The next victim could be you or me."
—
When Senku said that, he didn't actually expect that the next victim would be him.
He was quietly working on a project when he felt a light tickle in his throat. Nothing major; he simply let out a little cough, and it was gone.
Then it came back. Whatever. He just coughed again.
Then it came back… again.
Then again…
Then again–
Then again, and again, and ag–
Senku gagged and doubled over. Fuck–
He gagged again, and this time, a spurt of blood escaped his lips. Shit – that wasn't good. Really not good.
Senku covered his mouth and coughed uncontrollably, his vision going blurry, the world around him beginning to spin. He felt warm liquid slipping through his fingers and spilling onto the ground as wet coughs spilled from him. Shit, shit, shit– Coughing up blood was really not a good sign–
Senku retched, and suddenly, about ten white, blood-covered flower petals slipped from his throat.
Oh. Oh no.
How the hell did he develop Hanahaki? Who could he be in love with? Maybe stress helped it develop– M-Maybe this was a different mutation–
Fuck– a panic attack is not what he needed right now. He could feel his heart beating through his chest as he paced around the room, trying to find a reason for this. His usually over-active, logic-driven brain was filled with adrenaline, fight or flight instinct screaming and burning through him. It completely overrode all of the reasoning he usually used when emotions dared to rear their heads, reducing him to some instinctive animal searching for what caused the problem.
His hand instinctively shot up to his throat and grasped it tightly, no matter how much he tried to restrain himself. It was like an entirely different force was controlling him, as if some part of himself he'd buried in the darkest crevices of his mind was suddenly wrapping itself around his conscience and governing it like some kind of parasite. He stumbled forward, slamming his palm against the weathered wood walls as he gasped for air. He finally ripped his hand from his throat and coughed fiercely, desperately attempting to expel the blooming flowers tearing through the skin of his throat.
His breathing became labored, mixing with his difficulty breathing, leaving him choking and frantically gasping for air at the same time. He coughed as his heart hammered, petals flying from his lips, and he kept on coughing and coughing and–
A sharp pain shot through his chest, like someone had shoved a knife deep into his rib cage and left it wedged between the bones. He collapsed and cried out involuntarily, crimson red blood dripping from his lips. He was so caught up in his own distress he didn't even notice when the lab door swung open.
"S-Senku! I heard you yell, and– Oh my god!"
The voice was obviously Kohaku's, and he could hear her urgent footsteps as she rushed to his side. "Senku! Senku!" She shook him, but he couldn't answer when his throat was clogged with flowers and blood. "Oh no– Help! Somebody–" She yelled.
"K-Kohaku… D-Don't…" He managed to make out before another bout of coughing wracked through him and more petals escaped his airway. He was exceedingly dizzy, and he could tell it was beginning to overtake him as black dots sprinkled in his vision. All of his strength suddenly dissipated, and his head hit the ground as the rest of his body gave out. It was just in time for him to see multiple figures run through the door – and right before he passed out completely.
—
…
Well, he sure as hell wasn't dead.
I think.
…
Senku could feel his body being moved, but he couldn't do anything. It was clear he was entirely knocked out, unable to control any part of his body. It was an odd feeling – he'd never fainted before, but this was exactly what petrification was like. He was fully conscious, but he was also unable to move. The only difference was that he didn't have any stone coating his body and preventing mobilization, and instead, it was simply his own mind.
After what felt like another thirty thousand years, Senku's eyes fluttered open gradually. The light trickling into his eyes burned, and he instinctively lifted his arm up to cover his eyes.
"Senku-chan?"
He attempted to move his head to the side, but he groaned when he felt the soreness of his throat.
"Senku!"
A familiar black and white-haired boy with a concerned expression leaped in front of him and hugged him. "Holy shit, Senku-chan! Hanahaki was never this serious how could you–"
"I'm fine, mentalist," Senku stated raspily. "It's probably–" He coughed. "A different mutation–" He wheezed.
Gen shook his head and leaned away from Senku. "No, no, don't talk." He placed a hand on Senku's cheek.
For some reason, a warm feeling bloomed in his chest, akin to the flowers currently blooming in his lungs. Attempting to brush it off, he sucked in a breath that suddenly turned painful. He groaned and winced, knitting his brows together in pain while what felt like needles continued to pierce his chest.
Gen sighed. "You worried everyone, you know. They– They thought you were dead until I came around and took your pulse." He chuckled. "I don't know how none of these people have any clue how to do that."
Senku rolled his eyes. "I should be sure to teach them next time." He disobeyed and talked. His voice was embarrassingly raspy – like his vocal cords were grinding against sandpaper.
Gen grinned playfully. "Don't worry, I'm sure they know now."
Senku smirked back, gazing out the lab's window. It was bright out, likely afternoon, meaning he'd been passed out for the whole night and morning. That was pretty inconvenient – he'd make sure to get back to work as soon as possible.
With that, he sat up, but Gen immediately pushed him back down. "No, you need to rest, Senku-chan. I know you're a workaholic, but…"
Senku grumbled, shoving Gen's hand off his chest and sitting up again. "I'm fi–" Ironically, he went into another coughing fit and lied back down.
Gen smirked as if he'd won. "See?"
Senku rolled his eyes, but then he began thinking again. "I– I don't even know how I developed this. I'm not… I'm not…" I'm not in love, he finished in his mind. No shit, Sherlock. "I don't fall in love."
"How do we fix this then…" Gen hummed. "I wonder…"
Senku shook his head. The only way to treat Hanahaki other than confessing love was surgery, and they were a long ways away from that. However… there was another way to at least treat it.
"I could… Er… Get over whatever… feelings I have and try to find a way to get more oxytocin and serotonin in my body. That's–" He coughed– "the only real way."
Gen blinked. "And how would you–"
"Sex." Senku wheezed in place of a chuckle. "That's the easiest way to get an insane amount of pleasure chemicals."
Gen flushed. "Wh-Wha–"
Senku smirked. "Well, it's a way… but it doesn't have to be that. You guys will just have to find a way to make me happy I suppose."
"That's not easy…" Gen mumbled.
Suddenly, Senku erupted into another coughing fit. Thankfully, there was no blood this time, only white flower petals covered disgustingly in saliva. "Blegh…" He tossed the petals into the make-shift trash can conveniently next to him.
Gen sighed. "Well, I guess I'll work on that then."
—
It was obvious that Senku caught Hanahaki from Chrome, and that probably meant it was currently spreading all around the village. It was probable there were many different people with unrequited crushes or a surprising amount of stress chemicals – enough to confuse the virus like himself.
This meant they had to practically quarantine. Senku was required to be isolated in his lab, and Chrome was restricted to his own areas just in case he was still contagious. Whoever showed signs of Hanahaki also had to quarantine themselves.
Senku was fine with being alone. Honestly he didn't mind it all, really. He'd rather be alone than deal with the villagers. He was also feeling better, enough for him to get back to work. He always had a companion now – usually Gen – to make sure to catch him if he had another episode. Thankfully, he hadn't had one since.
"So…" Gen drawled from the corner of the lab.
"What," Senku huffed. He was working on a project. He didn't need Gen's small talk.
"I was thinking about how to treat your Hanahaki…"
Dump the oil into the pot. Add the acids and…
"How about we throw you a party?"
He should need about four cups of that. Then he needs to multiply the usual amount by ten…
"Senku-chan… Are you listening to me?"
Senku coughed. "No."
Senku could practically sense Gen rolling his eyes. "I was saying… We should throw you a party."
Senku sighed dramatically, turning around and pushing his safety goggles up his forehead. "Do you really think a party would give me an excess of pleasure endorphins? Also, I have to quarantine, mentalist."
"So you were listening." Gen smirked.
Of course I was, your voice is nice to listen to. Senku coughed a little more violently this time.
"Well… It should at least help a little, right?"
Senku shrugged. "As long as it's with people I've already been exposed to."
Gen grinned wide and bright, and for some reason, it made Senku's heart jump.
—
A couple days later, they threw a party.
Senku wasn't too excited. He could've been working on one of his projects, after all. However, Gen was ecstatic. He couldn't stop rambling onto Senku about how long it'd been since he'd been to a party – Senku joked that they'd all gone without one for centuries – and that this would be the most fun Senku would have in a while.
Right.
The party was practically a frat party. There were rows and rows of wine and fruit, but mostly wine. Party games were being played, or at least the ones Gen told everyone about. He'd never had the chance to go to a real one, considering the petrification happened his last year of high school, but Gen knew enough as someone who experienced college for about a year and a half.
As Senku was eating some kind of mango-tasting fruit, Gen approached his side. "So, what do you think?"
"Doesn't really seem like it's for me." Senku took a bite. "But it seems like it was well-needed for everyone anyways."
Gen nudged Senku lightly, causing a slight flutter in his chest. "Well, let's hope this helps.
Senku gulped, his throat starting to feel slightly more ticklish. "Yeah."
The rest of the party went as Senku expected. Singing, dancing– all of it. He even found himself getting lost in it all, laughing when Chrome hit his head trying to do a cool dance move to impress Ruri.
Eventually, they got around to another party game, this time insisting that Senku join them. Reluctantly, he did.
"So… how about truth or dare, and if you refuse it, you have to take a drink?" Gen suggested.
Kohaku grinned rather deviously. "Oh-Hoh! That sounds fun!"
Kinro pushed his glasses up. "I accept the challenge." Ginro promptly nodded as soon as his brother complied.
Ruri and Chrome eventually agreed, and Gen seemed satisfied with his work.
"Well, let's begin then!" Gen mused with a clap. "I'll start." He looked toward Senku with a smirk. "Senku-chan, truth or dare?"
Senku crossed his arms. "Dare."
"Ooooh… I see… Senku-chan's a risk-taker, huh?"
"No, I just think there isn't much I couldn't do," Senku retorted with a shrug.
"Hah! I should've known. Anyway, I dare you to run around the observatory and scream."
…
Senku took a drink.
Gen burst out laughing. "So you can't do anything, huh?"
Kohaku laughed so hard she was tearing up. "Imagine… Imagine if he'd done that though–" She must've, because she immediately went back to laughing.
This was going to be a long night.
After a few rounds and finding out that Kinro had once asked a girl out only to be swiftly turned down later, It came back to Senku. This time, Chrome was asking.
"Truth," Senku had responded, not wanting to repeat the past action. He could see Gen's mouth twitch upward at that.
"Have you ever had a crush?"
Senku thought for a moment before shrugging. "No."
"Really!?" Chrome looked dumbfounded.
"H-How?!" Kohaku looked just as psyched out.
"I'm just not interested in romantic bonds." Senku could tell there was another question behind their words, but they all seemed to collectively ignore it.
As time went on, it seemed like the group was targeting Senku. Every time he was asked, it seemed like he always took a drink. It was clearly having an effect on him, as he could feel himself getting more and more dizzy. Being intoxicated wasn't ideal, but it is known to bring lots of serotonin and oxytocin to the brain, so… it couldn't hurt, right?
Eventually, it came around to Senku's turn to ask. "Gen–" he pointed his gaze in the mentalist's direction– "Truth or dare?"
Gen tapped his chin a couple of times before smirking and responding, "Truth."
Senku thought for a moment, as he'd sort of expected Gen to answer dare. "What's the only thing you've been able to think about since you got here?" He'll say cola, won't he?
Gen smirked. "You."
Senku's throat suddenly felt very itchy.
That was when he began to cough– violently.
"Are you okay?" Kohaku asked with a frown.
Senku waved a hand at her, dismissing her as he coughed. "I'm fine."
He was – in fact – not fine. It felt like his lungs were burning through him and his heart was being torn to shreds – this party was supposed to have the opposite effect goddammit! He coughed violently, buckling over and stumbling back as he felt the familiar slide of petals up his throat.
Suddenly, he felt Gen's hand rest on his shoulder. It was obviously meant as a reassuring gesture, but it only made him cough more and more. Quickly, fully-formed flowers slipped from his lips and fell to the ground alongside spurts of blood.
It wasn't long before everyone was staring at him. This just made him burn with even more anger. "I-I'm fine, just–" He coughed out another large flower before falling to his knees.
Gen shushed him, soothingly rubbing his back. It made Senku seethe. "LEAVE ME ALONE!" He forcefully pushed Gen away, not missing how his eyes flashed with sadness.
Instead of his condition improving, the anger burning through him seemingly only made it worse, and he began to gag and retch as more blood and flowers spilled onto the ground. He curled in on himself, trying to stop the coughing by holding his breath. Not a good idea, but right now, his emotions were somehow overriding his logic. It was then that he realized there were tears running down his cheeks.
Shit.
All of the logic came rushing back to him in an instant, and he wiped his eyes, urgently bolting upward. "I-I'm leaving." He began running toward his lab.
"Senku-chan!"
He couldn't hear the others' cries. All he wanted to do was be alone, and that's what he got when he slammed the door to his lab shut. He gasped and stumbled forward, catching himself on a wall before retching and puking onto the floorboards. Shit, it'd spread to his stomach.
Someone burst through his door before he could stop them and rushed to his side. At this point, he was hyperventilating as his body's survival instincts kicked in.
Iwon'tcryIwon'tcryIwon'tcryIwon't–
Uncontrollably, a sob wracked through him as he collapsed, but someone caught him and dragged him to the corner of the room.
"Sh-Shit, this is so–" Senku gasped – "stupid–"
"It's not stupid, Senku-chan," a familiar voice comforted me.
Senku tried to stop the tears, but the goddamn hormones running through him prevented him. His voice trembled, and he whined as pain spread through his chest and abdomen. It wasn't long before he felt a warmth envelop him.
"Let yourself go, Senku-chan. That's why you have this disease. You're locking all your emotions behind a box."
"What an astute observation, mentalist…" Senku realized that most of the coughing was gone, but the tears hadn't stopped. He'd continued to tremble and sob into Gen's yukata no matter how hard he tried not to.
"FUCK!" He screamed, crashing forward into Gen's chest and crying out like he never had before.
Everything crashed into him at once. His father's death, trying to keep the village afloat, his death, Tsukasa– everything.
So much had happened over the past year or so, all of it was just… too much.
Emotions were trivial. They were only there to keep humans from doing irrational things. They shouldn't get out of control like this, but here he was. Stupid, so fucking stupid. He didn't cry. He never cried. He didn't–
The mantra running through his head only made him cry out again and gasp for air as warm tears slid down his face and soaked the fabric on Gen's shoulder. He gripped the delicate fibers of Gen's outfit as he shook violently, threatening to break it. Although, Gen didn't seem to care. He simply rubbed Senku's back comfortingly.
Senku eventually calmed down a little, only a few sobs making him jerk like a goddamn child. "That was… So fucking dumb…" He mumbled.
"You're done?" Gen asked, his voice soft.
"Yes." Senku sighed, lifting his head from Gen and wiping off his now soaked face.
"It's not healthy to keep your emotions in, Senku-chan."
Senku rolled his eyes and groaned. "I know."
"Then you know that a build up of cortisol will cause panic attacks like these. It's called Panic Disorder, Senku."
"Yeah, yeah. Psychology, whatever." Senku waved him off, standing up. "I'm going to go change."
He immediately fell back down.
"Shit."
Gen caught him. "You just lost a lot of blood, Senku. I'll take you to bed."
Senku simply grunted, suddenly feeling extremely exhausted. He let Gen carry him to his make-shift mattress and cover him up. He heard him dip a cloth in the water bucket nearby, then wipe it across Senku's face. "You can go to the hot springs in the morning and wash off there."
What felt like small fireworks popped through Senku's chest as Gen's soothing voice spoke to him. When Gen stood up, like a needy child, Senku lifted an arm up. "Mmmmn…. Don't– Don't go…"
He heard Gen chuckle. "I'm not. I'll be right back."
Gen was right, only a few moments later, he climbed into Senku's bed. "I'm right here," he whispered, and Senku fell right into sleep next to Gen's warmth.
—
Gen's hands were warm… The way they wrapped around Senku's waist was so comforting, like a warm blanket encasing him completely. He could feel Gen run his fingers through his hair, and a soft moan escaped his lips from the feeling of Gen's fingernails against his scalp. It was perfect… and…
Senku bolted awake.
"Mmm… Senku-chan?"
He was. He was in bed with Gen, and…
Senku immediately threw his blankets off of himself and got up, dizziness overtaking him.
"W-Wait, Senku-chan–"
"What the hell happened last night?" Senku asked, whipping around and clenching at his temples. Fuck, his head hurt.
"You… You don't remember? You had an episode…" Gen sat up, rubbing his eyes.
"Shit, I… I did?" Senku stumbled back, his fuzzy memory failing to come back to him. "But… the party…" His eyes widened. "Was I drunk?"
Gen shrugged. "You might've been. You were acting weird."
Senku groaned. "Jesus christ… I knew alcohol amplified Hanahaki! Fuck!" He grasped at his flattened hair as if he were about to rip it out.
"Senku! Senku, hey…" Gen rushed to his side. "You're very irritable lately… It could explain the Hanahaki…"
"No shit…" Senku shook his head. "Fuck! This is so stupid– I'm a goddamn scientist and everyone relies on me– Emotions shouldn't be invol–" Suddenly, he began to cough violently, expelling another bout of flower petals.
Gen squeezed Senku’s shoulder as he coughed, a worried look evident by his furrowed brows. “Let’s go to the hot springs like we said we would – actually clean you up.”
Senku didn’t exactly remember Gen saying that, but he nodded anyway. He could use a warm bath right now.
—
After making their way up the mountain, Senku set his small bag of toiletries down next to the hot spring he usually went in. Surprisingly, Gen did the same.
Senku raised a brow. Gen looked at him and shrugged, smirking. “You’ve been stressed lately, Senku-chan. Let me take care of you.”
Senku blinked, unamused. “I’m not having sex with you.”
Gen chuckled. “Oh no, no, I meant washing you and maybe a massage? I’m pretty good at those.”
For some reason, the thought of Gen giving him a message sent bolts of electricity through him, and he shivered. “Why not then,” he said, trying to push away the odd feeling.
In a flash, Gen had untied his yukata sash and slipped off the robes. All that was left was his undershirt and shorts, but he’d slipped those off quickly as well. It took a while for Senku to realize that he was staring until Gen smirked at him, only in his underwear.
"Like what you see?" Gen asked with a smirk.
Gen was rather slim. There were clearly some lean, defined muscles, but it was probably only due to the change in physical activity they now needed in the Stone World. It was the same for Senku; he was slim his whole life, but only now could he feel some of the hardness in the muscles of his arms and legs. Gen's build, however, was much skinnier than Senku's, and honestly… he couldn't stop staring at it. It was… rather attractive.
What?
Senku shook his head. "Shut up."
Gen only chuckled. Senku promptly ripped his jacket-dress off followed by his undershirt, leaving him in only his underwear like Gen.
"So?"
"So."
They stared at each other for a good minute until finally, Gen pulled his briefs off. Senku took this as his sign to do the same, and eventually, they both stepped into the hot spring – butt naked. It was odd, but embarrassment was a common emotion.
Senku sank into the hot spring's warmth, immediately greeted by instant relief. His muscles untensed, and he could practically feel the stress dissipate from him entirely. Unconsciously, he let out a long sigh and closed his eyes. He slowly dunked himself in the water and came back up with his hair sticking to his face. He pushed it out of the way before closing his eyes again and relaxing.
When he opened his eyes, he was greeted by the sight of Gen lathering himself with soap. It was
A few moments later, he heard Gen walking over, if the swishing sounds of someone walking in water wasn't enough to tell. Gen ran his hands through Senku's hair, coated with the make-shift shampoo Senku had made for almost the whole village. It wasn't anything major. All he did was take the soap he made, mix in some different chemicals, and he was done. Gen slid his fingers between the locks on his scalp, scrubbing gently. His fingernails scraped slightly, making Senku shiver and hold back a groan.
Gen suddenly stopped, and when Senku opened his eyes, the other had an odd look in his eyes. Sort of like he was…
"Turn around. I'll give you the message now."
Senku nodded, in too much of a daze to give a real response. He leaned his bare chest against the jagged rocks, wincing when it scraped a bit. He crossed his arms on top of the edge. It was sort of a… lewd position, but at least he wasn't bending over.
Senku felt hands grasp his shoulders, and he sucked in a sharp breath when Gen's thumbs rubbed into the sore spots right next to his shoulder bones. He rubbed soothing circles and pushed into Senku's skin, releasing the knots in them. Without thinking, Senku groaned.
"God, you're tense."
Gen kept moving along his upper back rubbing his neck and shoulders before sliding down to his mid-back area. He pushed in slightly, cracking Senku's back.
Senku moaned.
He covered his mouth almost immediately. That was rather… He shook it off.
It caused Gen to pause, too, but he eventually said, "Feels good, huh?"
Senku shivered, despite how warm the spring was.
Gen kept on pressing along Senku's mid-back before once again sliding down toward his lower back. That part of the spine was connected to his genitals, so he was a bit nervous. He'd heard prolonged massages of the lower back could cause arousal, but hopefully Gen was understanding.
As soon as Gen pushed a thumb against Senku's lower spine, a low, tingling feeling pooled in his gut.
Fuck.
He'd already been rather turned on. Massages were rather sensual, especially when they were both fully naked. It didn't help that he was just now beginning to feel the tell-tale signs that he was getting aroused from this.
Gen continued and pressed the muscles by Senku's hips, eliciting a low groan from him. Gen pressed even harder, pushing Senku slightly into the rocks, which brushed against–
Goddammit. He was hard.
Senku let out a shaky groan as his erection brushed against the rocks. It was slightly painful, but in his goddamn horny-ass state, the pain turned to pleasure.
Gen leaned forward and whispered into Senku's ear, "You alright, Senku-chan?"
Senku choked as those whispered words shivered through him. "I'm– I'm fine."
Gen hummed before getting back to what he was doing, but this time, he pushed closer, pressing his body against Senku's and–
Senku could feel Gen's erection against his ass.
"Gen–"
"You said that sex was one way to help this, right?" Gen whispered.
Senku bit his lip. "Yes, but–"
"Then let me do this for you, Senku-chan." Gen ground against Senku's ass, and they both moaned in sync.
Senku dragged his nails against the stone, trying to ground himself. He'd never done anything sexual before – he hadn't even kissed someone yet. Fuck – he'd never even been attracted to someone, yet here he was. However, the rush of endorphins muffled any prickles of doubt in his mind.
Senku panted heavily. "What– What are you–"
Gen rutted against him again and moaned. Senku gasped, biting his lip until he drew blood. He thrusted forward into nothing, his dick now painfully hard. He couldn't hold it back – he moaned loudly and threw his head forward. He heard Gen chuckle from behind at that, and Senku groaned in irritation.
Suddenly, Gen began to grind more forcefully, and more and more shocks of pleasure ran through him. A bead of precum spilled down Senku's dick as it twitched, begging for some kind of stimulation.
Senku panted and groaned. "Hnnngh… G-Goddammit– Gen, please–"
"Please what, Senku-chan? I don't know if you don't say~" Gen teasingly leaned forward and circled his hips.
" Mph! You're such a… such an asshole…" Senku breathed.
"Come on…" Gen drawled, rutting against his ass again, this time his dick slipping between his ass cheeks and sliding against the sensitive skin of his rim.
Senku bit back a lewd moan. " Fuck– Just fucking touch me already…" He mumbled. "Sh-Shit– please –" He whined embarrassingly.
In an instant, Gen's hand wrapped around Senku's erection and began to slide up and down. The water added somewhat of a lubrication, at least enough to make Senku groan and buck into Gen's hand. Both of their breaths were labored, and the excessive panting was making Senku dizzy.
The dual sensations of Gen rutting against him and the rapid movements of his hand made Senku go crazy. He tried to hold back the noises he was making whenever the shocks of pleasure shivered through him, but he couldn't. He'd only ever jacked off before – this was so new and so fucking good. He wanted more – he wanted to ravish in this newfound pleasure and drown in it.
Gen's dick nearly pushed into Senku's ass as he bucked forward, causing Senku to gasp and shudder. Gen's strokes were in tandem with his thrusts, and small moans escaped him each time.
"Who knew the great Senku, leader of the Kingdom of Science liked to be dominated… Hm… So vocal too…" Gen whispered as his hands creeped up Senku's arms before holding down the other's hands against the stone. "Maybe he likes being restricted too."
This bitch–
Senku hated the way the press of Gen's hands sent arousal surging through his body– the way the feeling of having no control made him feel liberated for once. Logical Senku would be disgusted. But right now, he was throwing away the logical part of himself and giving into pleasure completely.
Finally releasing it felt like a weight off of him as he began to moan and whine uncontrollably. He could tell that Gen was pleased, as he began to thrust harder against Senku's rim, eventually ceasing to jerk him off entirely. As a result, Senku ripped one of his hands from Gen's grasp and began to do it himself. It didn't feel as good at all, but it had to do.
Of course, though, Gen gripped Senku's hips and thrusted forward forcefully, breaking his way into Senku's ass.
"AGH!" Senku cried out, pain shooting through him. Did this idiot just–
It was too dry for Gen to push in fully, so when he thrusted forward again, his dick simply pushed upward, and – shit – the shot of pleasure that wracked through him caused him to moan like a goddamn porn star.
"H-Hah… Senku …"
Senku grit his teeth. This was dangerous. He couldn't let Gen actually fuck him anally without proper preperation. "Gen– Mmmph! – Gen don't–"
Gen pushed again, and Senku's previous thoughts dissipated.
Uncontrollably, a spasm wracked through him, and he cried out as his orgasm pummeled through his body like a goddamn tractor.
He spurt cum all over his hand as he milked out the rest of his climax and gasped for air, but Gen hadn't stopped. The tip of his dick was about the only thing inside, but it was apparently enough because Gen cried out and came, spilling his semen directly inside Senku's ass.
Gross.
Gen collapsed on top of Senku as they both recovered. Senku seemed to be the only one shaking, though.
"Ugh… Gen, get off me."
Gen whined. "And you're back to normal." He pouted, standing up and taking a few steps back, pulling out whatever was in there, eliciting one final gasp from Senku.
"Blech…" Senku winced as he tried to stand up, some of Gen's cum dripping down his legs. "Looks like we totally ruined exactly what we came here for."
Gen just shrugged, that goddamn smirk still on his face.