[NSFW] FIC - "Turnabout" (Patreon)

BKDKBK | canonverse | canon-divergent | UA third years (they're 18) | getting together | accidental voyeurism | exhibitionism | crack treated seriously | humor

Katsuki hears Izuku jerking off and messes up so badly the next day that he furiously decides turnabout is fair play, and they wind up in a masturbation competition like pining losers.

==

TURNABOUT

CHAPTER 1

They arrived at camp just before noon. Katsuki rolled his eyes as his friends rose to peer out their windows, like they’d never seen trees before. The bus pulled up to a traditional single-story building with stone roof tiles, sliding doors, and shoji windows. It sat against a backdrop of dense forest, the wall of green broken by cobbled paths that led to several cabins of similar design.

As they filed off the bus, Katsuki could practically feel the buzz of anticipation and uncertainty in the others. Their first-year summer training camp had ended in a villain attack and kidnapping, and the summer of their second year had been spent fighting a war. This would be their final chance to have a normal summer break as high schoolers.

Not that Katsuki particularly cared about “normal” summer breaks. Were it up to him, he’d be spending his break working at the Genius Office. But he had a good number of friends who wanted this experience, and Best Jeanist had insisted that Katsuki should as well.

“You’ve already fought and won a war, Great Explosion Murder God Dynamight,” Jeanist had said. “Enjoy your last summer as a student. It was hard won.”

Katsuki couldn’t argue with that. But he would make every moment of the next two weeks count by winning all the training exercises and increasing the intensity of his own regimen.

Or at least, that was the plan.

By that evening, he’d sat through a mind-meltingly boring welcome speech, been herded into an interminable campground tour, roped into agreeing to lead morning stretches, and endured dinner prep with extras who wouldn’t know what to do with a knife if it stabbed them in the ass. He would have escaped joining the others for campfire s’mores, except then Izuku had looked at him with those big dumb eyes and said, “Kacchan! You’re coming, right?” And Katsuki had no choice but to say, “Obviously.”

When they at last retired to their cabins, he was ready for the day to end. The class had been separated into three cabins, each with their own bath and mini kitchen.

Since this meant sharing a shower with five other boys, Katsuki made sure he was the first one in and out. He set up his futon on the tatami mat in the middle of the room and then burrowed beneath his blanket as the others moved around him with all the gracelessness of drunken rhinos.

It felt like hours before the last person finished bathing and settled into the futon to his right. Fucking finally. His eyes were closed, but the familiar scent of mint and citrus shampoo was enough to indicate the person fumbling around next to him was Izuku.

Rather than focusing on the fact Izuku was less than an arm’s length away, Katsuki squeezed his eyes tighter and willed his body to relax.

He was hovering right at the edge of sleep when a noise brought him back to awareness. Against the quiet, steady breaths of his cabin mates and the muted drone of cicadas, the shuffling of fabric sounded loud and discordant, especially as it came from directly beside him.

A moment later, it stopped. But before he could relax enough to recover that loosened thread of sleep, there was again the muffled shift of fabric, this time followed by the softest of sighs. Innocent enough if not for the barely-there whimper.

So here was the thing—after the war, it wasn’t unusual to find a classmate or three sleeping in the common area come morning. It became an unspoken understanding that anyone who woke from a nightmare could relocate there and likely find the company of another restless classmate.

According to Kirishima, the only ones who’d never made an appearance were Katsuki and Izuku. It wasn’t because they didn’t have nightmares though.

Katsuki would be the first to admit that he’d come a long way from the person he’d been at the start of high school, but that didn’t mean he was going to lay out his trauma like a blanket that he and everyone else would then have to sit on. It was a thing he’d gone through, a thing he’d survived, and thanks to school-mandated therapy, a thing he was working past. It was also nobody else’s business.

He didn’t know why Izuku had never joined what Katsuki called the Sad Sideshow Slumber Party though. Maybe he didn’t want to fixate on what happened either. Maybe he thought the others, and the world, had seen more than enough of the nightmares he’d survived, replayed in every single post-war documentary or opinion piece that had flooded news outlets for months. 

Katsuki’s fingers tightened around the corner of his blanket. He should reach out, wake the nerd before whatever nightmare he was having got any worse.

But then came the faint rustling of his blanket along with a breathy little moan, and Katsuki stiffened in realization. For long, excruciating seconds, his mind went fuzzy, filled only with the refrain of that quiet sound again and again and—

Izuku’s breaths hitched, and Katsuki’s entire body went hot. He was suddenly sweltering beneath his blanket, sweat collecting between his shoulder blades. What the hell. What the hell.

Fuck. Okay, he had a few options here. He could continue to feign sleep, because even though it was happening right next to him, something-something-hormones, blah blah something-human-nature-blah. This kind of shit was normal and expected, right?

That didn’t make it any less awkward though. He remembered the “talk” his dad had given him when his voice started cracking, and they were both still traumatized. 

Yeah, so he could ignore it, hope his dick got the message to calm the fuck down, and then ensure no one else slept beside Izuku for the rest of training camp because like hell he was chancing anyone else getting this close to the nerd’s hard-on.

Or… he could roll over and offer Izuku an extra hand. The air in his lungs grew thinner, hotter, his body torn between brain-numbing horniness and scorching mortification, although he didn’t know if it’d be for Izuku or himself.

He should just sit up and smack the idiot(‘s dick), because normal or not, who fucking jacked off in a room full of his friends?! Did he like the idea of being caught or something? Nope, Katsuki wasn’t going to think about that.

Except now he’d waited too long, and if he made it known he was awake, Izuku would know he’d been lying here, listening to the faint rustling of fabric and the soft, uneven breaths, and the shitty nerd probably wouldn’t be able to look him in the eye ever again.

Izuku made another muffled moan, quiet breaths hitching, before he released a shuddering sigh, and Katsuki ached.

A moment later, Izuku kicked off his blanket and rose. The moment the bathroom door closed, Katsuki pressed his palm to his dick, teeth grit against the pressure, before burying his face in his pillow and resisting the urge to scream into it.

+++

The sun had barely risen when Katsuki found himself glaring blearily at the rest of his classmates. Why had he agreed to lead stretches again?

Oh, right, because Izuku had opened his pouty nerd-mouth and told everyone that Katsuki had customized Izuku’s stretches and made a huge difference in his mobility. Even a year later, Izuku’s injuries from the war still needed tending.

Normally, Katsuki didn’t even have to think about the order of his stretches or which muscle group to focus on. Today, though, he blinked down at his boots planted in the grass and drew a complete blank about what to do with them. Fortunately, muscle memory had him moving without any input from his brain.

“Um, Kacchan?” Izuku asked.

He focused his glare on Izuku, who had taken up a spot directly in front of Katsuki as if he and his breathy fucking moans weren’t already center stage in every way possible. 

With an encouraging and irritatingly oblivious smile, Izuku said, “You’re not rotating your hips enough.”

Katsuki stared. And then stared some more until Izuku’s smile faltered and shifted into concern. He had no idea that Katsuki was currently battling his dick for control of his blood flow.

“Did you not get enough sleep last night?” Kirishima asked. He and the rest of the class were still holding the stretch as they waited for Katsuki’s guidance. “You look tired.”

“I’m fine,” he snapped before adjusting his hips so that the others could properly mimic his form.

“He’s probably just hangry,” Kaminari suggested, which earned a snicker from Sero and Sato.

Katsuki wondered if being a war hero would grant him a pardon for exploding the lot of them.

Unfortunately, the morning didn’t get any better. Izuku pointed out his sloppy form three more times before everyone rushed off for breakfast. With a huff, Katsuki stalked back to the cabin so that he could angrily jerk off to the memory of how Izuku sounded when he came.

It didn’t help. Izuku asked what was wrong, but Katsuki brushed off his concern. He couldn’t very well admit he overheard the nerd masturbating. But as the day wore on and more of their friends pointed out how distracted he seemed, his irritation grew, especially as Izuku continued prodding at him with questions and tea recommendations for relaxation and sweet smiles that concealed what a degenerate he was.

What the fuck was Izuku doing to him? Sure, touching himself to thoughts of those rough hands and thick thighs wasn’t anything new, but it had never been this… visceral. Distracting. Persistent.

He knew where he stood with Izuku, and that had always been enough—because it had to be enough—but now he knew what Izuku sounded like with his hand around his cock, and fuck but he wanted to know what other noises he would make if—

By the time evening fell, he was thoroughly fed up. Nearly fumbling a fighting match against fucking Ojiro was the last straw. This couldn’t continue. Either he had to tell Izuku to stop being a closet exhibitionist or—or… shit, he couldn’t ask to change cabins. Izuku would know. Or he’d get all mopey and sad, which was just as bad.

No, he had to confront Izuku. At least then they’d both be too mortified to get hard.

Except then the clueless asshole had the gall to suggest a dietary adjustment after the third time Katsuki had to lock himself in a bathroom until his semi settled down, and Katsuki decided to fuck the direct route.

The nerd wanted to know why Katsuki was so off kilter today? Then he would damn well show him.

+++

As Katsuki expected, Izuku waited to bathe last. At least the nerd was still predictable in that way. He was always the last to leave the training yard, determined to wring every drop of sweat he could from his abused muscles.

This worked in Katsuki’s favor, although by the time Izuku finally settled onto the futon between him and the wall, Katsuki had begun to second guess his decision. Scattered across the tatami mats, four of their classmates slept soundly, their light snores joining the chorus of nocturnal insects. After the rigorous exercises their teachers had put them through that afternoon, there was little chance of them waking.

But he still balked at the idea of touching himself surrounded by others. He doubted he’d even be able to get hard.

Katsuki lay on his back, turned slightly toward Izuku. He’d pushed their futons closer while Izuku was bathing, but the other boy hadn’t noticed in the dark. Nor did he notice Katsuki’s gaze, watching as he languidly stretched, arms above his head, spine slowly arching off the mattress, the lines of his body limned in the faintest moonlight.

Fuck, okay, so getting hard wasn’t going to be a problem. Fine then.

He wouldn’t accept another day wasted. He was here to train, damn it. Not to pine over that shitty nerd and his breathy gasps—

What was that saying about turnabout being fair play?

He waited a bit, long enough that Izuku wouldn’t get suspicious, but brief enough that he hopefully wouldn’t knock out like their classmates either. Then, with the image of that perfectly arched back planted in his mind, he reached for the waist of his pajama bottoms.

Katsuki wasn’t one to take his time. Even when fantasizing about Izuku, he was perfunctory about it, careful not to let his desires get too out of hand. If he wanted to get his heart racing and his blood pumping, then he typically preferred it happen in training or combat.

But as he lay there, Izuku a mere arm’s length away, he imagined hard muscles and lightly freckled skin beneath his palms and he knew with absolute certainty that he would stretch every second into an eternity just to keep Izuku close, those breathy moans building into cries of pleasure.

A quiet grunt escaped him as his hand closed around his thickening cock. He bit down on his bottom lip, head tilting back against his pillow as his thumb smoothed over the tip. Catching a bead of pre, he rubbed it over silky skin and slowly rolled his hips.

Heat climbed up his chest, spreading into his shoulders until he felt sweat building beneath his clothes. Because of his quirk, he could tolerate a considerable amount of heat. But it suddenly felt like too much, every breath thick and cloying.

With a gasp, he pushed the blanket down to his thighs, and then slid his free hand beneath his tank. He hiked up the fabric, exposing his fevered skin to the rush of cooler air.

Leaving his top bunched up beneath his chest, he raised his knee and angled his body more toward Izuku so that if any of the extras woke, they wouldn’t be able to see anything. Then he lowered the waist of his pajamas and boxers enough to free his cock.

From the futon beside him came a tiny, instantly cut-off gasp. He should’ve been mortified—and a part of him was—but the confirmation that Izuku was awake and aware heightened his arousal above any shame. Never let it be said that Katsuki didn’t know how to put on a goddamn show.

With one hand fisting his dick, he smoothed the other down his hip, dipping low to briefly cup his balls as he thrust upward. His breaths were quick but quiet, his tongue darting out to lick dry lips. He trailed fingers up his stomach, scraped his nails against the lower edge of his chest scar before flicking lightly at his nipple.

Katsuki had never found much pleasure in touching his chest, but it was worth it for the barely audible whimper from within the mound of Izuku’s blanket.

“Fuck,” he whispered, working his fist faster. His breaths stuttered, muscles straining, head thrown back in an effort to stay quiet, and then he was coming, gasping, biting hard on the inside of his cheek to keep from moaning.

Hot liquid spattered his stomach, his knuckles, as he squeezed his eyes shut and rode out the tremors of pleasure.

He swore again, covering his face with his clean hand. His heart continued pounding in his ears as he gradually came down. What the fuck had he just done?

It didn’t take long for the relief of orgasm to shift into discomfort. In silence, he slowly sat up just enough to tug his tank over his head. He used it to wipe his crotch and hand, nose wrinkled with disgust. He should have planned this better. Or not done this at all.

But as he adjusted his clothes and rose from the futon, he couldn’t help stealing a glance at Izuku. The nerd lay on his side, curled around his blanket, body tight and stiff and very obviously not asleep despite his determinedly closed eyes.

He was smug for only as long as it took to lock the bathroom door behind him. Then his satisfaction faltered as he caught his reflection. He looked flushed and a little sweaty, his hair even wilder than usual.

Izuku had listened to him jerk off. Had probably seen his hard-on, or at least as much of it as he could in the meager light. And yeah, that had been intentional, but he’d failed to consider the possibility that Izuku might actually... like it?

Katsuki had intended to unnerve him. To get under his skin as thoroughly as he’d gotten under Katsuki’s. To teach the idiot a lesson. Except if Izuku had liked it, then…?

Then it didn’t mean anything except that Izuku was a normal, hormone-driven man. With a shake of his head, Katsuki put it from his mind.

+++

The following day, Katsuki’s uncertainty was put to rest because Izuku was a fucking mess. Katsuki hadn’t been this self-satisfied since deciding what his hero name would be.

Every time Izuku even looked in his direction, his face went red and he stammered out an excuse before turning tail. It was entertaining as hell.

Except another thing Katsuki hadn’t considered was how Izuku being incapable of functioning around him meant he was short a training partner.

He ended up partnering with Todoroki until lunch, which was when Sero and Kaminari dragged them down to the lake. Their other classmates had set up a volleyball net on the beach for their free hour.

Izuku was there, feet bare in the sand. Like Katsuki, he’d shed his UA sports uniform top, leaving only the bottoms and a thin t- shirt. When he spotted Katsuki and the others, his eyes went wide before he turned stiffly and pretended not to notice their arrival. Katsuki smirked.

“Catch up on your beauty sleep?” Mina asked brightly as she bounded toward them. “You’re less cranky.”

“Not enough sleep in the world to make him less cranky,” Sero said. He and Todoroki joined the others around the net.

“I’ll show you cranky, damned—”

“Bakugo!” Kirishima called. “We’ve got next game!”

“Not interested. I’m going for a swim,” he said, shucking off his tank. He was bent over, one leg free of his sports pants when several gasps and shouts of alarm had him turning toward the volleyball net.

Izuku was crouched over, both hands covering his face which Katsuki could tell was furiously red even through his fingers. The volleyball was still rolling away, but it was ignored as Kirishima, Uraraka, and others gathered around him in the sand.

“Sorry, Midoriya!” Ojiro called sheepishly from the other side of the net. “I mean, I did say I was serving the ball to you…”

Katsuki let out an unattractive bark of laughter. Had the nerd been watching him strip and expected another show?

“Rude,” Mina accused, but Katsuki only cackled and waded into the water in his boxers.

+++

Before their hour was up, Katsuki headed back to the cabin to shower and change. The water had felt amazing in the heat, and Asui had caught a bunch of fish to grill for dinner later.

When Katsuki entered the cabin, he was surprised to see light spilling from the bathroom door where it hadn’t been completely shut. He’d assumed all of his roommates were still on the beach, but he hadn’t bothered to check.

Maybe whichever extra had used it last had left the light on. But as he approached, the bathroom light wavered, like a body was moving inside. Whatever, he’d use the communal showers. It was farther off, but he should have time before they needed to reconvene for afternoon exercises.

As he turned away, a soft whine escaped through the cracked-open door. He froze, wondering if he’d misheard.

It came again, louder, an impatient little sound that made his dick twitch. Because he knew that urgent gasp of breath, had replayed the sound countless times in his head.

Swallowing tightly, he couldn’t stop from facing the bathroom again. His legs moved without his consent, Izuku’s quiet noises snaring him as surely as Shinsou’s mind control. A moment later, he was beside the door, back pressed against the wall, breaths thin and quick and silent.

What was this guy’s fucking problem?! He was jacking off in the middle of the day, and sure, Katsuki had done the same yesterday, but at least he’d closed and locked the damn door! Was he really an exhibitionist after all?

It was possible because he was getting louder. Izuku was full-on panting now, breaths broken by soft grunts and whimpers, and accompanied by the wet, lewd sounds of slick skin and frantic movements. Before Katsuki could think it through, he dropped the bundle of his sports uniform and shoved a hand down his wet boxers.

It was uncomfortable and kind of gross, but he was so hard and horny, and fuck that shitty nerd because what the hell?! The entire point of last night had been to prevent this from happening again, but Izuku had simply moved his jerk-off session to-to—

Was he doing this on purpose? Katsuki had been the only one among their roommates to go swimming, which meant Izuku had to have known Katsuki would be returning soon to shower.

Had he left the door cracked on purpose? Was this payback for last night? For the volleyball to the face?

Fury and arousal burned through him as he thrust into his fist, swearing even as he matched his pace to Izuku’s breaths until he was coming hard, ropes of cum spilling onto his skin and boxers. From within the bathroom, Izuku had finished as well because the faucet suddenly turned on.

Katsuki snatched up his clothes, which he positioned over his crotch, and then stormed out. If this was how Izuku wanted to play it, then fine. Katsuki was game.

==

CHAPTER 2

Katsuki had a plan.

First, he had to know if Izuku was deliberately messing with him. While Katsuki was usually smug about how he was the only person who could tease out Izuku’s competitive side, this was pretty weird even for them. So during dinner, Katsuki finished eating first and then loudly announced his intention to shower in the communal bath house first so that he could get the large space to himself.

A few of his classmates gave him questioning looks, and several others rolled their eyes, but Izuku only hunched his shoulders, all but burying his face in his bowl.

The bath house stood a little farther off from the other cabins, the dirt path that led there lit softly by several sconces. Unlike the other buildings, it was entirely modern in design. Inside, without windows to view the campsite, he could’ve been in a UA facility.

On another night, he would’ve washed quickly and then taken his time soaking in the bath. But right now, he had a plan to stick to. So he stripped down and tucked his things away in a locker. Then he opted for a shower with a privacy screen rather than the ones lining the open room. He damn well wasn’t giving anyone else a show.

While he waited, he washed his hair and body and let the fantastic water pressure work his sore muscles. Feeling more relaxed, he let his palm slide slowly across his stomach as he closed his eyes. It was far too easy to imagine Izuku’s hand instead, exploring the muscles beneath his fingertips, tracing the webbed scar tissue at his right side and then the larger one at the center of his chest, directly above his heart.

He rubbed small circles around his left nipple, his pulse jumping at the sensation. Even with only his imagination, it already felt better than his previous curious touches. His other hand lowered to cup his dick.

There was a quiet sound—a door shutting—and Katsuki paused, ears straining to hear over the shower. Someone was crossing the bath house, heading towards the showers with privacy screens. Heading towards him.

Eyes narrowed, he waited until the other person had pulled the screen shut on their shower stall before he stuck his head out of his own. The privacy screens were little more than flimsy near-translucent curtains hanging from curved rods. The other person had chosen a stall near his, and a green blob that had to be his hair was clearly visible through the curtain.

Katsuki’s stomach clenched. A flurry of reactions assaulted him. Vindication that it wasn’t all in his head. Desire swift and low in his belly. Confusion because what the fuck? And the possibly irrational need to prove that he wouldn’t let this continue to distract him, and to do that, he had to win… whatever the hell this was.

And then they would never speak of this again. Probably.

Now that the first part of his plan had succeeded, it was time to move onto phase two. Taking a deep breath of the humid air, he closed his eyes and took himself in hand again. He was only a little ashamed that Izuku’s arrival had brought his dick to full erection.

He sighed softly, placing one hand against the slick tiled wall as the other slid leisurely up and down his shaft. Knowing that Izuku was just a couple stalls away had his blood pumping hot and fast beneath his skin, coaxing a low moan from deep in his throat.

As the only two people in the bath house, it was easy to separate the sounds of his shower from Izuku’s. He imagined the water hitting his body, splashing as he rubbed soap over hard muscles and scarred skin. His hand moved faster over his length as he pictured soaked curls and flushed cheeks, green irises around blown pupils, red mouth swollen from kissing, from biting, from being stretched around his cock—

He came with a guttural sound, barely holding back from saying the nerd’s name. Breathing hard, he shoved his head beneath the shower spray and nearly missed the soft moan from Izuku’s stall. Fucking sexy stupid nerd.

Gnashing his teeth, Katsuki quickly rinsed off and then cut off the water. The sudden loss of a second running shower meant Izuku’s gasp was audibly louder. The sound punched through his gut to grip his dick. What the hell, he was not getting hard again.

He ripped his towel from the hook and draped it around his hips, gaze zeroing in on the green blob of hair through the curtain. A rushing sound filled his ears. He found himself drawn forward, his body moving on its own…

The bath house door flew open. His senses crashed down around him, and he froze. Izuku fell instantly silent. Face flaming, Katsuki rushed past Izuku’s stall into the open bath house.

An hour later, Kirishima found him by the lake, sitting alone at the end of the pier, sandaled feet hanging above the water. Farther off on the beach, several others lounged on deck chairs to watch the sunset.

Kirishima settled beside him, the old wooden boards groaning beneath the additional weight. For several minutes, he said nothing. But Katsuki could sense the other boy’s restlessness, his body language all but shouting his intention.

His patience at its limit, Katsuki finally snapped, “What do you want, Shitty Hair? You’re being annoying.”

Kirishima looked offended. “I’m just sitting here!”

“Say what you came to say or fuck off.”

With a long-suffering sigh, Kirishima said, “You’ve been acting weird ever since we got here. Everyone’s noticed.”

Katsuki snorted. “So what? Did they make you their representative to come talk to me?”

“It was put to a vote,” he admitted sheepishly.

“Well, you can tell those extras to mind their damn business.”

“Bakugo,” Kirishima said, giving him that kicked puppy look that made Katsuki want to toss him into the lake. “We’re worried. You haven’t been off your game in a long time. We just want to know if you’re okay.”

Glowering, Katsuki leaned back on his arms. He knew they meant well, and he did appreciate that usually. This was just… a unique situation.

Then again, Kirishima and Ashido were the first to make it official in their class, whereas Katsuki had yet to even kiss anyone. True, that was because he didn’t care (unless it was Izuku), but he had to give the guy credit for still going strong in his relationship.

He slanted Kirishima a narrowed look. “Oi. You share what I tell you with anyone, and I’ll murder you.”

Kirishima straightened, eyes shining. “You know you can trust me.”

Despite how annoying he could be, he was right. Katsuki did trust him. So with great reluctance, he muttered, “It’s about that shitty nerd.”

“I knew it!” Kirishima whisper-shouted, fist pumping. When Katsuki all but snarled at him, he mimed zipping his lips closed.

Although it took several false starts and a close call with nearly exploding the pier, Katsuki got at least part of the story out. He wasn’t about to share any details.

“Pfft— Kirishima slapped both hands over his mouth, but it was too late to try hiding the laugh. It didn’t help that his shoulders were trembling and his eyes danced with humor.

Katsuki saw red. With a battle cry of, “FUCKING DIE!!!” he aimed a small explosion for the fucker’s shitty ass hair.

“I’m sorry, I’m sorry!” Kirishima cried as he fell into the water, effectively dousing the smoking ends of his hair. “You’re going through a hard time, and I shouldn’t have laughed!”

Katsuki had leapt to his feet, arms held out at his sides, palms popping with small explosions. “See if I fucking tell you—

“Wait, wait, wait,” he said, pulling himself out of the water and back onto the pier, thoroughly soaking the boards. “Listen—I’m sorry. Just… I don’t know, that’s… pretty shocking, I guess? Not just for you, but Midoriya too.”

Nose wrinkling, Katsuki marginally relaxed. He wasn’t wrong.

“I know you guys are pretty competitive, but this seems… extreme. I never would’ve expected Midoriya to be so…”

“Yeah, yeah,” Katsuki said to keep him from saying anything else embarrassing. He was already turning red enough that he looked like his dye job gone wrong. “Which is why I can’t just ask him what his deal is.”

“Why not?”

“Are you fucking serious?”

“Hear me out. You guys talk about pretty much everything else, and you’ve literally—er, you know, done that next to each other. What would talking about it hurt?”

Because then it’s real, he thought, a bit pathetically. Talking about it meant explaining why he’d ’retaliated,’ which meant explaining why Izuku jerking off had messed him up so damned much, which meant admitting he wanted to touch Izuku so badly that he ached with it.

“I might not know him as well as you do, but Midoriya is my friend, too. If he’s going this far, then it’s gotta mean something, right?”

+++

Katsuki would find out exactly what it meant a couple days later.

After being subjected to another toe-curling performance the night before, Katsuki rose before everyone else to go for a run and a cold shower. This whole stupid thing needed to end, because he didn’t think his dick could take it for much longer. But stopping meant admitting defeat.

What Kirishima had said was also something Katsuki had questioned. He just couldn’t figure out Izuku’s motive.

Exhausted and sweaty, Katsuki dragged himself to the communal bath house. The sun had barely risen so he had some time before the others got up. He washed quickly and then cursed himself, Izuku, his hormones, this useless training camp, and the whole damn universe as he took himself in hand.

He worked his dick harder than usual, grunting and cursing under his breath with every angry jerk of his fist. Even writhing the pleasure, this no longer felt like relief. It just frustrated him more, because as much as he needed this to end, part of him dreaded that. It would mean no longer being able to hear Izuku’s muffled moans, his stuttering breaths, his needy whimpers.

God, he was such an idiot. He should just put a stop to this. Instead, he thought about Izuku’s spine arched beautifully, the muscular plane of his back slick with sweat, and bit down hard on the back of his free hand.

He was so close, which was when his shower curtain was pulled open.

“Fuck!” Katsuki snarled, the hand fisting his dick moving to conceal it instead as he angled his hips away from the intruder. “Get the he—

His gaze met huge green eyes. Izuku stood there, one hand still gripping the curtain as the other dug his nails into the taut skin of his stomach. He was completely naked.

“Kacchan,” Izuku breathed. Then, to Katsuki’s utter bewilderment, he stepped into the shower with him.

His quirk was useless under the shower spray so he opted instead for backing up against the tiled wall and slamming his palm against the nerd’s flushed face and shoving hard.

It didn’t do much, but Izuku did stop trying to crowd into his stall.

“What the fuck, Deku?!” Katsuki shouted, keeping his gaze firmly above the other boy’s shoulders.

“I—You—I thought— Izuku’s eyes skimmed shamelessly down Katsuki’s wet, naked body. Despite himself, Katsuki was fascinated by the way his pupils dilated and his mouth went slack with lust.

Shaking himself out of the daze threatening to overwhelm him, Katsuki reached out and ripped the shower curtain from Izuku’s grasp. The action seemed to snap Izuku out of it as well, because he took a halting step backward.

“Oh, no,” Izuku whispered as he took in whatever expression Katsuki was making. In an instant, he went from furnace red to ghastly pale. “I-I made a mistake. I’m so—Kacchan, I…”

He didn’t finish the sentence, instead spinning on his heel to flee. Katsuki snagged his arm before he could get very far, forcing him to stop. Thankfully, Izuku didn’t fight, but he didn’t turn to face him again either. Which was fine because they were both still naked.

“Don’t run,” Katsuki said, slightly appalled at how the demand came out more like a plea. “What did you mean by that? What mistake?”

“Kacchan, please let go.”

“Fucking answer me first.”

Sounding absolutely miserable, Izuku mumbled, “I thought it’d be okay. We’ve been doing, you know, and I thought we were working up to more, but I was wrong, and I’m so, so sor—

“Stop apologizing,” Katsuki snapped. The muscles beneath his grip tensed, but Izuku didn’t try to break free. “What is it you think we’ve been doing?”

“Um…” His ears and freckled shoulders went pink. Katsuki distractedly wanted to drag his tongue across the hot skin. “Flirting?”

Katsuki blinked. He opened his mouth and then closed it again, realizing he had nothing to say except to stupidly echo, “Flirting…”

Izuku reacted like he’d been struck, flinching hard before trying to curl into himself and away from Katsuki. “Like I said,” he mumbled with a humorless little laugh that cut right through Katsuki’s sternum, “I made a mistake. Can we just—

“No,” Katsuki said, so forcefully that Izuku flinched again, this time in surprise.

Head turning, Izuku caught his eye for a split second before hastily looking away. He didn’t say anything more, though, despite the nervous tension all but vibrating under his skin. The fact Izuku hadn’t yet broken free and fled was surprising.

Or maybe not, as the nerd drew a shaky breath before asking, “So then… if I got it wrong, what have we been doing, Kacchan?”

Of course. If Katsuki wasn’t willing to let him leave, then he wouldn’t let Katsuki try to hide from this either. It made sense, given that Izuku had never made a habit of running from difficult truths.

“And don’t tell me ‘nothing,’” he continued. Even through the humiliation, Katsuki could hear the hurt, the confusion. “I didn’t imagine the last few days. Th-that first night was an accident, but then y-you—you did that, too, and I knew something was different because I know you, Kacchan.” He took another, deeper breath. “So what was it then?”

How did Katsuki even begin to explain? What was there to say that wouldn’t make him sound like he’d lost his mind?

If Izuku could be honest, though, then Katsuki owed him the same.

“I…” Fuck, this was hard. Why was this so hard? “I thought you were… messing with me. With my head.”

At this, Izuku finally turned to look at him. That furrow between his brows deepened, which would’ve been more intimidating if he didn’t look so bedraggled. Although he wasn’t directly beneath the shower spray, the humidity meant his hair clung to his damp skin in limp curls.

Damp skin rosy with continued embarrassment. Damp skin prickling with goosebumps as cooler air slipped in through the partially drawn shower curtain. Beads of moisture gathered beneath his jaw and the back of his neck, and Katsuki watched, mouth suddenly bone dry, as a single droplet slid down the ladder of his spine.

“Why would you think that?” Izuku asked, sounding bewildered. “Wait, if you thought I was messing with you, then you… were messing with my head, too?” Whatever conclusion he seemed to make must have been unpleasant because his expression went suddenly but deliberately blank.

“It’s not like that,” Katsuki said. “I was just… frustrated…”

As if against his will, those green eyes dropped to skim over the length of his body before widening almost comically, face going up in flames. Katsuki was instantly reminded that they were having this conversation while wet and naked, and even after the abrupt interruption, even after the misunderstanding… that didn’t change the fact Izuku was just as naked and his dick had absolutely no shame.

Except Izuku wasn’t looking away, even as his eyes went dark and glassy, and why had Izuku barged into Katsuki’s shower anyway? Oh, right, because… because…he’d thought they were flirting.

“W-we should p-probably—

“Izuku.” His heart was like thunder in his ears—pounding, reverberating, earth shattering.

At last squeezing his eyes shut, Izuku made a small whimpering sound. “I can’t keep talking to you like this while we… I’m leaving.”

“Izuku, listen,” he forced out, gripping Izuku’s arm tighter. He couldn’t let him leave without being certain… “Hearing you like that… I haven’t been able to think of anything else. It was driving me insane.”

“Oh my god, I get it! I’m sorry, okay?” Izuku cried, covering his face with his free hand. “I don’t know what I was thinking. If it’d been anyone else—

“If it’d been anyone else, I would have exploded their dick off.”

Nose wrinkling, Izuku said, “O-kay… Um, I really think we should get dressed.”

“Izuku, are you hearing me?” he said, a little desperately. “You fucking drove me to distraction.”

He seemed to clue in on what Katsuki was doing an absolute shit job of explaining because he cracked one eye open, that sliver of green focusing on Katsuki’s face. Katsuki could practically see that nerd brain running on overdrive, all of his thoughts tumbling around his skull.

Izuku swallowed, drawing Katsuki’s attention to the bob of his throat. “I… I want to be sure I understand, so let me get this straight,” Izuku began, each word drawn out with careful consideration. “You overheard me touching myself, and… were so distracted by it that you thought I did it… to purposely mess with you?”

“When you put it that way,” Katsuki grumbled.

“Kacchan,” Izuku said, sounding equal parts baffled and awed. “You were so horny that you couldn’t concentrate on morning stretches.” While Katsuki’s brain stalled at hearing Izuku say ‘horny,’ the other boy continued, sounding increasingly breathless. “You kept disappearing to the bathroom. You… Kacchan! Did hearing me make you so horny that you had some kind of-of… Chargebolt brainmelt and thought that getting back at me by making me just as stupidly horny was a good idea?!”

That was when Katsuki realized the quaver in Izuku’s voice was, in fact, laughter. The little fucker was laughing at him, which… okay, yeah, he deserved that. But Izuku was far from innocent here.

“Oi.” With a firm jerk, Katsuki tugged Izuku closer. Izuku’s muffled laughs ended in a surprised gasp as his shoulder collided with Katsuki’s chest, and they were once again made excruciatingly aware of their nakedness. “You just admitted I make you stupidly horny.”

He did nothing to hide his amusement as he said, “I told you I thought we were flirting! By being exhibitionists! That should’ve been obvious.”

“Can I kiss you?”

Izuku’s mouth snapped shut, eyes going huge and hungry. Katsuki’s chest rose and fell too quickly, every breath pressing their bodies closer. It was all he could do not to arch his back and roll his hips so he could feel for himself just how stupid horny he made Izuku.

The humid air grew hotter, thicker, the tension between them suddenly overwhelming.

Then, Izuku parted his lips and murmured, “No.”

Surprise jolted through him. He immediately released Izuku, shuffling backward into the shower spray, grateful for the deluge of water pouring over his head to distract from the sting of rejection.

==

CHAPTER 3

“Wait, I didn’t mean ‘not ever,” Izuku said hastily. “Just not right now.”

Katsuki wiped the shower water from his eyes, before glaring at the other boy from beneath drenched bangs.

Sucking his bottom lip between his teeth, Izuku averted his gaze and awkwardly crossed his arms. Typical that the nerd was now choosing to be self-conscious about being naked. Katsuki had yet to look any lower than Izuku’s chest, even though it was taking all his will power to resist. It didn’t help that his peripheral vision was a fucking tease.

“I think we should take this time to do what we’re supposed to,” Izuku said, staring at the wall left of Katsuki’s head. “Which is train. Since it’s only for another week, and then we’ll have the whole rest of the summer for… um. For u-us.”

Ignoring how much his dick liked the pink flush to Izuku’s shoulders, Katsuki scoffed. “You’re saying this now after you were ready to jump me a moment ago?”

“Yeah, well, then you said you thought I was messing with you. So now that we’re on the same page, we can go back to focusing on training.” Izuku suddenly frowned. “We’re on the same page, right? You want this, too? Er, I mean, this thing between us. Not just the flirting but like, you know, although actually, you didn’t say that, did you? Only that you were really horny—”

“Calm down, nerd. Yes, I fucking want this. You. Whatever you’ll give me.” He drew a deep breath through his nose, filling his lungs with the humid air and allowing the confession to settle.

He hadn’t actually intended to say all that, but the words were out now and there was no point trying to backtrack. He meant it after all.

Predictably, Izuku’s eyes welled with tears. “Me, too. Also I kind of, well, it’s corny and you’ll probably laugh, but I never imagined it going like this, or that it might be possible at all—”

“Izuku,” Katsuki growled.

“I’ve never kissed anyone!” Izuku blurted, turning a scorching shade of red. “So all of this is pretty new, but I figured I’d just go along with what I thought was f-flirting and pretend like I knew what I was doing so you wouldn’t think I was a clueless virgin—”

“I definitely think you’re a clueless virgin,” Katsuki said, a surge of possessiveness taking root beneath his ribs. Izuku was and would only ever be his.

“Kacchan,” Izuku muttered with an adorable pout.

“You thought listening to each other jack off was flirting.”

“It’s—that’s—it could be considered high level flirting! F-for really experienced… people.”

“That’s something a clueless virgin would say.” Then, because Izuku was starting to look more hurt than offended, Katsuki offered, “I’ve never done anything either, idiot. Who do you think I am? Like I gave a shit about any of that.”

Izuku fortunately didn’t point out the heat in Katsuki’s cheeks as he gave him a happy smile and asked, “And now you do?”

“Obviously,” he grumbled.

“Kacchan, I’m looking forward to when training camp is over,” Izuku said, a warmth to his tone that made Katsuki’s insides twist into knots.

Somehow, even through all the awkward confessions, Katsuki was still hard. And kind of pissed that Izuku was the one setting the boundaries for while they were here. Katsuki was the best because he had absolute control over his body and quirk, but that control had never before felt so tenuous.

Partly to regain a semblance of control and partly because he was still horny as fuck, Katsuki shifted against the wall to put the shower spray between them. Then he spread his legs and took his length in hand.

“You interrupted me,” he said roughly, watching Izuku’s eyes go dark and glassy with renewed desire. Satisfaction at the nerd’s reaction and pure pettiness was enough to chase away any embarrassment as he began stroking himself. “You can stay and watch, or you can go, but I’m finishing either way. Next time, though, I wanna see how you touch yourself. Wanna put a proper visual to all those sounds you make.”

“Kacchan,” Izuku whimpered, one hand shooting out to steady himself against the wall.

Smirking, Katsuki rested the back of his head against the wet tile and finally gave into the searing need to look.

Through the fan of his pale lashes, he allowed his gaze to track down Izuku’s damp chest, nipples hard despite the warmth, and the definition of his abs that contracted with each quick breath. A faint line of dark hair beneath his navel led to a trimmed thatch of green curls between sharply defined hips.

Katsuki couldn’t help the moan that escaped him as he took in the other boy’s cock. It was a nice length, thick and flushed with arousal. The head was a dusky pink, wet from the water and precum both. Fuck but he wanted to touch it.

Instead, he squeezed himself tighter and stroked firmly, imagining it was Izuku’s hand gripping him. Those rough palms and scarred fingers would feel incredible wrapped around his dick, gliding up and down the sensitive length, pulling back the foreskin so that he could kneel at Katsuki’s feet and suckle at the tip.

Izuku’s cock twitched, dripping with his desire. He wasn’t even touching himself, all of his attention captivated by Katsuki’s lewd display. Before this damned training camp, Katsuki would’ve never imagined doing this in front of someone, but that someone being Izuku was the only reason any of this was okay.

He arched his back, grunting as he felt the coils of release tightening in his balls. His eyelids wanted to close, to give himself over fully to the pleasure, but he refused to miss Izuku’s expression as he watched Katsuki come. The nerd was breathing hard, his entire body tense with anticipation, cock jutting from between powerful thighs.

Then, completely untouched, Izuku moaned Katsuki’s name and his cock pulsed, spurting ribbons of white that was immediately caught by the shower spray. It was the hottest fucking thing Katsuki had ever seen.

“Izu,” Katsuki gasped as he came, spilling hot and messy over his knuckles, muscles quivering, the pleasure wringing through him until his vision went white.

When he finally came down from the high of release, the spot where Izuku had been was empty. Katsuki slumped against the wall, smiling stupidly, feeling boneless and more satisfied than he had all week.

+++

The next day, Katsuki again led morning stretches. He surveyed his classmates, strolling between them like a drill sergeant while barking out corrections and criticizing flexibility.

This time, Izuku had taken up a position in the back alongside Uraraka. With the flash of a grin, Katsuki gripped Izuku’s waist and leaned in to murmur against the other boy’s ear, “Make sure you rotate those hips, Izu.”

Then he continued on, smiling smugly as Izuku did his best impression of Todoroki igniting into flames.

That afternoon, when everyone was exhausted from training, Katsuki slung an arm over Izuku’s shoulder and said, “You look good all sweaty and panting.”

Later, after a quick game of volleyball, Katsuki delivered a quick but firm pat to Izuku’s ass after he’d landed a nice spike. Izuku yelped in surprise, but Katsuki was already relishing their victory, his teeth bared.

He stewed in self-satisfaction all the way until dinner when Izuku and Todoroki took the empty seats across from him in the dining hall. The food on Izuku’s tray seemed innocent enough if a little unusual—yakitori, kiritanpo, choco-banana, a cluster of green grapes, and a small container of yogurt.

“Hey, guys,” Kirishima greeted with his usual exuberance. “Eating light, Midoriya?”

“Yep,” Izuku said, before those determined green eyes shifted to Katsuki. Then, their gazes locked, Izuku brought a grape to his lips.

Katsuki caught a glimpse of his tongue before Izuku placed the grape in his mouth, lips closing with exaggerated slowness around his fingertips, which pulled lightly at his bottom lip.

Heat flooded through Katsuki, desire clenching around his balls. He swallowed so hard that his food lodged in his chest.

“Shit,” he choked out, wincing as he hunched over and smacked at his ribs. Several voices called out to ask if he was okay, but he barely heard them.

Concern tugged at Izuku’s brows, probably struck by a moment of guilt. But once he saw that Katsuki was fine, it melted into a small crooked smile and he popped another grape into his mouth.

The shitty nerd had just declared war.

Oh, it was so fucking on.

He elbowed away Kirishima’s attempts to ensure he wasn’t choking and decided that would be the last reaction Izuku was getting out of him. A near impossible thing to keep to when, a moment later, Izuku shoved the choco-banana into his mouth, sucked obscenely around the chocolate shell, and then slid it out and licked his lips.

Holy shit?!  Katsuki almost bit through his cheek to keep from activating his quirk and exploding their entire table. He could do nothing about the blood rushing into his cheeks, though. When they got back to Musutafu, he was going to murder Izuku. With his dick. Repeatedly. 

As Izuku licked and nibbled the hard chocolate that coated the length of his banana, Katsuki glared and devoured his meal with violent bites. His chopsticks practically speared the rice, clacking loudly against the bowl.

“Midoriya, why are you performing fellatio on fruit?” Todoroki asked, confusion writ across his brow.

Izuku startled, biting down hard. A chunk of banana fell onto his plate.

“What the fuck, Half-and-Half?” Katsuki demanded, more out of second-hand embarrassment than any actual outrage.

Todoroki looked thoughtful. “Should I have said ‘blow—’”

“Whaaaa,” Izuku spluttered. He was already blushing from his brazen performance, so he only hunched his shoulders and wiped his mouth with a napkin. “I’m just eating!”

Sero leaned toward Todoroki, amusement thick in his tone as he asked, “How do you even know that word?”

“The Internet.”

“Oh my god.” Groaning, Katsuki shoved away from the table, unable to take the absurdity a moment longer. And if he could also use the excuse to escape Izuku's terrible innuendos that were still somehow working because Katsuki was a fucking simp, well then that was a bonus.

He finished eating alone, too quickly for anyone to try and join him, and then headed for their cabin. He needed to shower and a door he could lock. Fortunately, he didn’t get any surprise interruptions, and he was relieved to sprawl on his futon, playing a mindless phone game to unwind.

An hour later, he received a text from Izuku informing him they were gathered in the main building to watch a movie. Leaving the quiet of the cabin and his futon to cram onto a bunch of stiff pillows and watch a loud movie? Hard pass.

He went back to his game, which prior to Izuku’s text, had been doing a great job of keeping his thoughts from wandering to taut freckled abs and soft lips stretched around that goddamn banana… and Izuku’s cock, dark and pink, clear fluid leaking from the slit. He’d never wanted to taste something more.

With a curse, he rolled onto his back and glowered up at the darkened ceiling. Then, resenting every moment, he shoved his hand down his shorts.

It only took a few strokes and the memory of damp skin to get him hard. He bit his lip to hold back a moan, the pleasure swift and shockingly intense. What the hell was Izuku doing to him?

He swallowed, throat dry, and let his legs fall open. Heart pounding, sweat forming, Katsuki stroked himself with one hand as his fingers drifted lower, seeking more. He didn’t touch himself there often, only when he was particularly pent up and always because of a green haired dork.

He didn’t want to use spit so he only rubbed the pads of his fingertips against the tight ring of muscle, but it was enough. He gasped in lungfuls of air, his back arching and hips thrusting against the pressure of dry fingers. It was so easy to imagine Izuku above him, crooked fingers pushing between his thighs, thick cock heavy against his hip.

“Izuku,” he moaned, his hand jerking faster.

“Kacchan?”

Katsuki’s eyes flew open, and he went rigid. Then, in a flash of panic, he yanked his hands from his shorts and rolled so that he was on his stomach and almost off his futon. A heartbeat later, Izuku stepped in. Katsuki hadn’t even heard the cabin door open.

“Kacchan?” Izuku repeated. Thankfully, he didn’t turn on any lights. “You awake?”

Maybe if he didn’t reply, the nerd would leave.

“Why are you breathing so hard?”

Fuck his life. “Whaddaya want?” he grumbled into his pillow.

He heard the shuffling of bare feet and blankets before a heavy body settled onto the futon beside him.

“Were you touching yourself?” Izuku whispered.

Mortified, Katsuki rose onto his elbows so that he could scowl at him, never mind the dark. “Whose fault is that?” he hissed.

“Yours! You started it with the whole… touching… thing. All day!”

“At least I was subtle about it!”

“Masturbating for anyone to walk in on you isn’t subtle.”

“Whatever!” Katsuki shifted so that his back was to Izuku. He wasn’t actually angry—he was just frustrated. His dick hadn’t gone entirely soft yet.

“You can finish if you need,” Izuku said, too perceptive for his own good.

He huffed. “You want another show?”

The choking sound from behind him offered a moment of satisfaction.

Then Izuku ruined it by asking, voice uncertain, “Kacchan, you weren’t just messing with me again all day, were you?”

“Of course I was,” he scoffed. “If I gotta be horny, you fucking gotta, too. You’re the one who decided to wait until camp is over.”

With a short burst of laughter, Izuku managed to say, “Okay, okay. Truce? Please? It’s just… there’s always someone around so privacy isn’t really possible.”

It took a great will of effort not to remind the nerd he’d started this by jerking off in the middle of a room full of his classmates. But he was also right. This couldn’t continue, least of all because one of the other idiots was bound to find out.

“For our f-first time,” Izuku mumbled, “I want to take my time with Kacchan. I don’t want to feel rushed.”

Well, fuck. Now his eyes were stinging because only in his wildest fantasies had he ever imagined those words from Izuku. A first time implied more times to follow, and even though Izuku had already confirmed he felt the same last night, it was still… sinking in.

So he drew a quiet breath that was only a little shaky and whispered, “Yeah, okay.”

==

CHAPTER 4

Katsuki felt a mixture of relief and disappointment that the rest of camp went without anymore semi-public jerk-offs.

They both stuck to their truce, no matter how much Katsuki wanted to reach across the scant distance between their futons and pull his nerd close. No matter how much he wanted to drag Izuku into the showers and press him to the wet tiled walls.

As pathetic as it was pining for when he would finally get to touch Izuku, part of him kind of liked the anticipation. The heated looks across the volleyball net, the secret smiles when one of them caught the other staring, the warmth in his belly and the kick in his pulse—he’d never before understood why couples did such cringe things.

And to be completely honest, because Katsuki was done with lying to himself, he still didn’t quite understand it. But now he knew what it felt like to have his feelings reciprocated, to be wanted just much in return. It was… really fucking great.

Also, they were back to being training partners, and they fought with the intensity of the sexually frustrated. Even the others noticed their increased aggression, although the only person who didn’t ask questions was Kirishima. No, he just looked like he was constantly holding back laughter, which earned him a few more dunkings in the lake.

Finally, after a restless night of resisting the urge to touch himself, the day of their departure arrived. Katsuki had never been so relieved to be done with training.

Izuku sat near the front of the bus with Todoroki, and Katsuki found himself in the back next to Tokoyami. He liked that the other boy never felt the need to fill the silence.

As the others started talking about bus-ride games, Katsuki put in his earbuds and closed his eyes. Getting Izuku to himself wasn’t the only reason he was eager to return to UA. As much as he appreciated the company of his friends, he also valued his solitude.

His social battery was decidedly at zero, and he was ready to be able to put a locked door between himself and the rest of the world. Except Izuku. Obviously.

Tokoyami had the aisle seat, so Katsuki rested his temple against the window and allowed the music in his ears to lull him to sleep.

Sometime later, he was awoken from a disturbing dream about being force fed overcooked broccoli. His brows wrinkled as he blinked blearily out the window where the road whizzed by in a gray and green blur.

Then, something shifted against him, and he became suddenly aware of the weight of a sleeping body against his side, from the press of their thighs up to the faint breaths warming his shoulder.

Nose wrinkled, he tensed, turning to shove Tokoyami off of him. Except instead of black feathery hair, he found green curls and freckles. Dark eyelashes fluttered ever so slightly as Izuku wedged his face even more firmly against Katsuki’s neck.

Katsuki went still, throat tight, as he waited to see if he’d woken the other boy. But Izuku carried on sleeping, oblivious to the way Katsuki’s face grew steadily hotter and hotter.

A quick glance around the bus confirmed Izuku had switched seats with Tokoyami while Katsuki had been asleep. The sneaky little nerd. Ensuring that most everyone else was either asleep or engrossed with their phones, he gingerly arranged Izuku against him so that he looked more comfortable.

He’d never admit to how long he spent watching Izuku sleep. He made so many minute expressions, from the slight pucker of his brows to the flutter of his lashes or the way his lips tightened at the corners. It felt nice to be able to observe him at such close range without feeling self-conscious.

He wanted so badly to kiss him. What would Izuku’s lips feel like? They looked soft. Maybe a tad dry. He wanted to gently coax away the tension around his mouth.

To his surprise, the desire to kiss him had nothing to do with lust. He just… wanted the physical contact. He wanted to inhabit the same space, inhale the same air, wanted to split himself open and press that scarred palm to the seams of his heart that beat to a single refrain—Izuku, Izuku, Izuku.

Fuck, he was so in love with him.

Chest aching, heart racing, Katsuki gently laced their fingers. Then he rested his cheek against tufts of soft green curls and closed his eyes.

+++

The next time he woke, it was to the jostling of his classmates as the bus slowed before the gate into UA.

Beside him, Izuku was already on his feet and chatting softly with Uraraka and Hagakure. Looking away, Katsuki curled his fingers against his palm and didn’t think about what Izuku must have thought when he awoke to find their hands clasped.

As they filed off the bus and then waited for their driver to unload their luggage, Izuku found his way back to Katsuki’s side. Then, surrounded by all their friends and without the shield of bus seats, Izuku shyly took his hand.

Katsuki only tensed for a heartbeat before his hand tightened around Izuku’s. The brilliant smile and flushed cheeks that earned him was worth the barely stifled snickering and excited squeals.

“Mind your own business, extras,” Katsuki snapped. He was surprised they weren’t getting more of an obnoxious reaction, but that was likely Kirishima’s doing. He’d have to thank the idiot later.

With a long suffering sigh, Aizawa said, “Do your summer homework and stay out of trouble. I don’t want to see or hear about any of you until break ends.”

Then, with a stern look that lingered on Izuku and Katsuki a tad longer than the rest, he waved and turned for the gates.

Once they’d collected their suitcases, their classmates scattered to go their own ways. Most everyone was going home for the rest of summer break, including Izuku and Katsuki.

But students weren’t technically required to vacate their dorm rooms since the school year was far from over, so with only a shared glance, the two wordlessly headed toward Heights Alliance.

On the way, he texted his parents. He didn’t know what excuse Izuku was using, but he told his parents he wanted to take advantage of UA’s facilities to maintain the momentum of what he’d learned at training camp.

Strictly speaking, it wasn’t a lie.

As the only two students returning to class A’s dormitory, it shouldn’t have been a surprise that the moment the front doors shut behind them, Katsuki gripped the collar of his dumb t-shirt (that inexplicably read, ‘Hoodie’) and hauled him close. Izuku looked startled, though, big green eyes going even bigger at the sudden proximity.

“Hey,” Katsuki mumbled, mentally wincing at how lame he sounded.

Izuku didn’t seem to mind, a happy smile replacing his surprise. “Hey.”

“Can I kiss you now?”

Despite the red staining his cheeks, Izuku said, “Yes, please.”

“Thank fuck,” he breathed before Izuku cut him off with his mouth.

All things considered, it was a sweet kiss. As he’d imagined on the bus, Izuku’s lips were soft and a little dry. Tentatively, Katsuki slid their mouths together, increasing the pressure as they grew accustomed to the feel of the other, the soft exchange of breaths and the tingling heat that spread outward from their joined lips.

As first kisses went, it was pretty perfect. Fucking sap, he told himself.

“Can we go to your room?” Izuku asked, still so close that their lips brushed with each word.

Katsuki smiled against his mouth. “Why? Lighting’s great here.”

“Kacchan!” Izuku drew away, embarrassed.

“Don’t pretend like you’ve got any shame now, nerd. I meant it when I said I wanna see how you touch yourself. Wanna see every fucking detail.”

Izuku’s throat bobbed as he swallowed. “Please can we go to your room?” he repeated in a breathless whisper.

What could Katsuki do except say yes?

Abandoning their suitcases at the entrance, Katsuki grabbed Izuku’s wrist and tugged him through the common area to the elevators. Izuku slapped his palm over the button for the fourth floor before shoving Katsuki against the wall and planting another kiss on his lips.

Despite the way Izuku’s hands clutched at his shoulders, his kiss was uncertain and clumsy. Katsuki didn’t mind as he kissed back, his fingers burying in soft green curls. Izuku gasped, pressing closer, their bodies nearly flush.

The elevator chimed and the doors slid open. Groaning, Katsuki pushed Izuku off of him and then grinned when the nerd chased his lips.

“Come on,” he said, voice rougher than usual as they raced one another to Katsuki’s door.

Just in case any of the extras decided to come back for whatever reason, Katsuki locked the door behind them. He’d been mostly joking about fucking in the common area. He didn’t want any chance of their first time getting interrupted.

Then he was on Izuku, kissing him roughly, inelegantly, licking into the other’s mouth and earning a reedy moan in response. They stumbled toward the bed, any intention to take it slow or savor sweet, languid kisses fleeing beneath seeking hands and hot, thrumming blood.

He pushed Izuku onto the bed before yanking off his tee and reaching for the waist of his sweatpants. Izuku watched, panting, pupils blown, before he had the presence of mind to undress as well.

Katsuki got his pants and boxers down just enough to free his aching dick. Then, with a hungry grin, he hooked his foot around the rolling base of his desk chair and pulled it close enough to drop down onto the seat.

Confusion knit Izuku’s brows, but it was hard to pay attention to his expression when he lay sprawled against Katsuki’s dark sheets. He was gloriously naked, that gorgeous cock lying heavy against a flat belly.

Izuku had the type of body that appeared slender when dressed in loose t-shirts and ill fitting pants, but underneath, he was all compact muscle, strength carved into every dip and angle, from the cut of his biceps down to the valley of his hip bones and those thick fucking thighs. He wanted to touch all of him, map out every scar, every freckle, create constellations with his tongue and teeth.

But first, Katsuki settled more comfortably in his seat, took his dick in hand, and somehow found the nerve to say, “Well? I told you I wanna put a visual to all those hot fucking sounds you make when you touch yourself. Show me.”

Even with the curtains covering the balcony doors, enough sunlight broke through to illuminate the pink flush that spread across Izuku’s chest. Still, the nerd didn’t back down. Instead, holding eye contact, he rested one hand atop his stomach and slowly trailed those crooked fingers lower to the dusting of green hair beneath his navel.

Katsuki had to remember to breathe, inhaling shakily, throat so dry that it clicked uncomfortably when he swallowed. He couldn’t look away as Izuku wrapped a hand around his cock, a barely audible sigh escaping his lips as he stroked his length. 

They’d hardly begun, and Izuku was already leaking, pre beading at the tip before Izuku swiped his thumb over the slick and left a sticky sheen.

Katsuki wanted to lick it.

He squeezed the base of his cock, getting his libido under control as Izuku spread his legs further apart, his other hand sliding down the corded muscle of his thigh before cupping his balls. Arching slightly, Izuku groaned and then quickly clamped his lips together to silence any more sounds.

“Let me hear you,” Katsuki demanded roughly.

“Kacchan,” he gasped, writhing as he continued pumping his cock. His other hand wandered lower, two fingers slowly massaging the sensitive skin beneath his balls. “Kacchan, this is so embarrassing.”

Despite his words, he kept going, releasing his erection to wipe his fingers, sticky with precum across his pecs. He painted slick around his nipples, moaning as he pinched them lightly. The hand between his legs trailed lower until two fingers tapped at the tight bud of his entrance.

“Kacchan,” he whined, back arching, muscles taut, sweat beginning to gloss over freckled skin. He abandoned teasing his nipples, returning to his dripping length. Izuku thrust up into his fist, hips and thighs straining.

“Fuck,” Katsuki hissed, rising to his feet so quickly that his desk chair shot away, wheels spinning. 

He kicked off his sweats and boxers before crawling onto the bed. Izuku grasped at him greedily as he sank against him, at last fitting their bodies together. They moaned into each other’s mouths as their hips aligned, burning erections wedged between flushed, sweaty skin.

“How is this real?” Katsuki breathed, hitching one of Izuku’s thighs higher around his hips and grinding downward. “You’re so fucking hot. You make me crazy.”

The snort of laughter from the boy beneath him was so unexpected that Katsuki went still. Ignoring Izuku’s whine of protest, Katsuki drew back enough to meet lust-glazed green eyes.

“The fuck is so funny?” he asked between trying to catch his breath.

“It’s just,” Izuku began with another stifled laugh, “I make you crazy. I make you so crazy that you thought we were in some kind of masturbation competition.”

“Yeah, yeah, laugh it up! Your nerdy ass thought we were flirting!”

“We kind of were.”

“Fuck you—ack!”

Izuku had flipped them. Katsuki glared up at the other boy, whose sweaty hair clung to his forehead in absurdly cute curls.

“Do you want to?” Izuku asked, the humor fading from his voice. “F-fuck me, that is.”

If not for the way all his remaining blood shot to his dick, Katsuki might have laughed at the way Izuku stumbled over the curse word. He blinked stupidly, taking in the way Izuku sucked his bottom lip between his teeth and bit down anxiously.

“Because I do,” Izuku whispered into Katsuki’s continued silence. “But I… I also want to have Kacchan. If that’s o—”

Katsuki yanked him down, a little harder than intended because their mouths collided with more teeth than lips. They adjusted quickly, though, sucking and licking with clumsy enthusiasm. Izuku braced his weight on his elbows, hands gripping fistfuls of blonde hair, as Katsuki took hold of his hips, hooking a leg around Izuku’s calf for leverage as he thrust upward.

“Anything,” Katsuki panted into his mouth. “Everything.” He didn’t give a fuck whose dick went where as long as it was with Izuku.

They fell into a frantic rhythm, grinding, groaning, making sounds that Katsuki would be embarrassed about later. Right now, though, all he knew was Izuku thrusting desperately against him, sweat and precum a slick mess between their bodies, muscles shifting and contracting beneath his hands, the hot and heavy breaths against his neck between stinging bites.

“Gonna come.” He tilted his head back, crying out as Izuku licked up his neck, lapping up sweat and sucking at his Adam’s apple. “Shit!”

He shuddered, dizzying pleasure jolting through him as he spilled between them. Through the aftershocks, Izuku kept going, moaning a litany of “Yes, yes, yes, oh god, yes.”

Then, he followed Katsuki, trembling and gasping as more wet heat joined the absolute mess spreading across his skin and pooling in the lines of his stomach and belly button.

It was gross, and so fucking hot.

Exhausted, Katsuki lay boneless and breathing hard as Izuku rolled off of him to collapse at his side.

“Wow,” Izuku mumbled, that familiar thread of awe underlining the word. “That was way better than touching myself.”

A huff of laughter escaped him. “Damn right it was.”

“Seriously, that was too good,” he said with a fond sigh. “I might not be able to get off without you now. Might have to try.”

A lazy grin stretched Katsuki’s lips. “That a challenge, nerd?”

~fin