Work Text:
The midday sun beat down hard on the gym's windows, raising the temperature inside despite the air conditioning roaring from the vents.
The written exams and physical tests were just around the corner, including their licensing exam, which will determine who graduates with a certified hero license and who spends their entire summer working their assess off so they can retake the tests in September.
Which explained why the gym was fully packed on a Tuesday at twelve-o-seven when Katsuki had barely seen any of these assholes here whenever he came to do his second training session of the day.
The sound of a machine in the background, as the weight plates fell and clattered violently against one another, somehow managed to piss him off more than the constant yap of conversations going on around him.
“Fucking idiots.” He grunted under his breath. “Don’t know how to use equipment or what?”
Kirishima laughed next to him. “I think Denki’s just overestimating how much weight he can actually pull.”
Katsuki clicked his tongue, pulling a bench right in front of the mirror where he planned to do his dumbbells reps. “Well, if he had taken his training seriously, he wouldn’t be here making a clown of himself.”
He snarled when Kaminari dropped the weight and they slammed against each other again.
“Come on, man! Everyone’s pushing themselves.”
“Baku-kun’s got a point, though.” Mina said, standing on her tiptoes to look at Kaminari over the swarm of heads. “If he keeps going on like this, he’ll end up straining a muscle.”
“No way. Denki can handle himself.”
“Eiji, do I need to remind you what happened during our morning run two weeks ago?”
Katsuki took a long sip of his water and grabbed two light weights to start his warm-ups, deliberately tuning out the conversation the other two were having next to him. He put on his headphones and turned on his music, letting the beats of the drums and rifts of the electric guitars transport him into the zone.
He hated having to work-out like this, when the gym was so crowded that people had to take turns in between sets to share the same machine, when it seemed like you had to horde your equipment if you didn’t want some asshole to show up out of nowhere and snatch if from you like, say, Round Cheeks trying to steal his 47.5s when he was resting in between sets.
“I’m not done.”
“But Bakugou-kun, you’re not using them right now!”
“I said I’m not fucking done!”
On top of the unnecessary number of people crowding the room, there were the incessant conversations all overlapping one another from those who treated the exercise as a fun social event. Or worse still, the douchebags who hogged the machines just to sit there and scroll through social media.
Katsuki would gladly give them a piece of his mind and blast those last few the hell out of here.
He dropped a heavy dumbbell onto the rubber floor as he finished another set, rubbing his right pec and enjoying the burning sensation in the muscle after pushing it to its limit.
Beads of sweat formed on his scalp and trickled down his temple, a slick sheen of sweat already coated his neck, and his clothes were beginning to stick to his body. He took off his sweatshirt and tossed it aside, so he could keep working out in just a tank top.
Katsuki cursed under his breath when Ears and Rainbow showed up to join Mina on whatever the hell they were doing on the mats next to him, and had to turn the volume on his headphones all the way up just to drown out their high-pitched voices.
He rolled his shoulders to relieve tension on the joint, peeking at his phone to check the time. He still needed to rest for another seventy seconds before starting the next set, so he sat on the bench with the music blasting in his ears and took a look around the place.
Kaminari had moved on to a different machine that he seemed to be sharing with Tail. Ponytail Girl was scolding someone for something Katsuki didn’t give two shits about. Four Eyes was doing push-ups with the Frog Girl sitting on his back.
And from the corner of his eyes, through the narrow gap between the machines, Katsuki could see Izuku sitting on the leg press.
He had both feet placed on the platform, pushing it away with every stretch of his legs. For what Katsuki could see from his position, he’d say Izuku must be lifting at least a hundred kilos.
Katsuki had seventy seconds to rest in between sets. That’s seventy seconds Katsuki spent looking at the way his thighs tightened with each rep.
His movements were slow and controlled, flexing his knees to bring the platform toward himself, holding the weight for just a second before he pushed the platform away. Even from where he was standing, Katsuki could make out the deep line etched into his hamstrings as it strained under the weight.
And every time Izuku drew his legs towards his chest – every single damn time – the hem of his shorts would ride up, revealing just another inch of skin.
Katsuki dragged his eyes away, clicking his tongue and focusing back on his own exercise. He picked up the weights and leaned back against the bench, some English lyrics he never fully learnt screaming pleasantly in his ears. He lifted his weights, exhaling with each movement, and kept track of the number of repetitions in his head.
He wondered if he could lift one hundred kilos on the leg press. He hadn’t done that in a long while, always choosing to work with free-weight equipment rather than using a machine. Maybe he should give it a go today, show the nerd he wasn’t the only one with strong legs in the gym.
Yeah, well, maybe he’d been focusing more on his upper body lately. Sue him. But with the kind of quirk he had, it was only a logical thing to do.
Katsuki felt a trail of sweat running down his armpit as he lifted the weight again.
Now who the hell wore such short pants if you were planning on working out on the machines anyways?
Katsuki could understand wearing shorts for running, ideally with compression shorts underneath so you didn’t end up with sore thighs, but the machines were filthy. He doubted any of these idiots were wiping them off when moving from one to the next, so who would want to press their skin against some dirty synthetic leather?
Katsuki dropped the weight abruptly when his arm struggled to complete the full range of motion, and he realized he had gone over the number of repetitions he was supposed to do by two.
“Fuck.” He grunted, propping himself up on the bench and running his arm across his sweaty face.
The blonde strands of his bangs were stuck to his forehead, and sweat was practically pouring down his body at this point. He took a long gulp of water, catching his breath for a moment and checking his phone.
Seventy seconds rest.
His attention had drifted back to the same narrow gap without him realizing it. He couldn’t see Izuku’s face from here, just the movement of his legs through the space between one machine and another. Izuku pushed the platform once and his quadriceps stood out in sharp definition, the solid muscle swelling under the effort. He pulled his legs towards his chest once more, and Katsuki kept his eyes locked on the way his shorts rode up – just another inch – revealing a glimpse of his tight blue boxers through the gap formed by the loose fabric.
He didn’t even blink, as a solitary drop of sweat trickled down from the back of his knee, rolling down his thigh until it disappeared inside his shorts.
Katsuki stuck out the tip of his tongue and instinctively caught a drop of sweat running down his face.
He shook his head once and picked up his weights again.
What the fuck was going on with him today. It must be all these people crowding his space and pissing him off, disrupting his routine. There was no other reason for his attention to keep diverting elsewhere.
His senses were overestimulated. That must be it. Hence why he kept getting distracted and didn’t seem to be able to concentrate solely on what he was doing.
This time he kept track of each repetition, without losing count.
Six… Seven… Eight.
Katsuki switched from his right hand to his left, and started counting again.
One… Two… Three…
While, at the same time, he kept thinking about those fucking shorts, and fucking blue boxers, and fucking Midoriya Izuku getting in his line of vision, keeping him from focusing on his own work-out like the annoying little shit he was, because Katsuki was for some reason very interested on checking – and re-checking, and double-checking – the way those legs moved.
Fuck. Was it really because the gym was fucking crowded that he couldn’t concentrare? Or was it something else entirely?
Maybe it just so happened that Katsuki hadn’t gotten laid in a while. But he had been studying like a motherfucker for the finals, and he had been training his ass off, so it’s not like he had much time for it anyways.
But, why Midoriya Izuku of all people?
Well, he wasn’t really looking at Izuku precisely. He was just checking out a pair of bare toned legs drenched in sweat mid-work-out. Who those legs belonged to was probably the least important thing.
Katsuki dropped the weights when he finished the last rep, stood to adjust the bench for his next set of exercises, and sat back down with the water bottle in one hand and his phone in the other one.
Ninety seconds rest this time.
He pretended to scroll down his emails for approximately four seconds before looking up again.
Izuku was sitting there motionless now, likely resting in between sets. His feet were still placed against the platform, his legs bent in a ninety degree angle, those sinful shorts rolled up so high they were almost tucked under his glutes and a sheen layer of sweat glistered under the artificial lights of the gym ceiling.
Katsuki swallowed hard when scarred crooked fingers stretched across his hamstrings, digging into the flesh and massaging the muscle with slow deliberate strokes, sliding nice and easy over his soaked skin.
He followed the path they made, traveling from the back of his knee and up across his thigh, slipping under the hem of his shorts. They traced circular patterns on the skin, digging into the muscle, tensing with each squeeze. Sweat soaked what little of his boxers Katsuki could see, and he kept his eyes locked as fingertips inched dangerously close to the crease where Izuku’s leg met his pelvis.
Katsuki shifted in his seat, adjusting his pants with one hand without taking his eyes off those thighs dripping in sweat, and with cautious movements, he repositioned the growing erection that was stretching beneath his underwear.
A fast-paced song pounded against his eardrums, the heavy bass thundered, the beat of the drums pulsed, and Katsuki kept his eyes fixed on the fingers running along the hollow of Izuku’s groin, brushing once, then again, a touch that seemed almost thoughtless.
Katsuki’s breath hitched when those scarred fingers covered in sweat ventured just a little bit further, and he found himself thinking how good would it be if they just so happened to slip under his underwear. If they would hook into those blue boxers and lift them, just a little, just for Katsuki to see what was hiding underneath.
He almost jumped out of his skin when Kirishima tapped him on the shoulder.
“What?!” He snapped, taking his headphones off with a swat of his hand.
“Dude, are you okay?”
“What are you talking about, Shitty Hair?”
Kirishima looked at him with a half concerned, half amused expression. “Your face is all red, man.”
Katsuki snapped his head toward the mirror to take a good look at himself.
Fuck.
He was all red.
His face was completely flushed. A blush spread from his chest, partially exposed by his tank top, and climbed up his neck until it settled intensely on his cheeks, further accentuated by that glistening sheen of sweat that covered his skin. His lips were swollen and red from abusing them – he didn’t even remember doing it in the first place.
But the most mortifying thing of all wasn’t his obvious expression betraying his depraved thoughts. But right there, reflected in the mirror, at a perfect angle that left him completely exposed and looking him straight in the eyes, was Izuku.
Fuck.
Fuck, fuck, fuck.
Katsuki felt his breath catch in his throat and his chest tightened, but his shame was so overwhelming that it froze him in place, unable to look away, he sat there paralyzed like an idiot.
Izuku was staring at him through the reflection, lips parted, exhaling in deep breaths. He had a soft blush tinting his cheeks, blending his freckles onto his skin.
Katsuki’s dick pulsed once at the sight of him, growing uncomfortably hard inside his underwear. He dared a look further down when Izuku’s hand, which had been still for a moment, moved again, brushing across his soaked thigh and returning to that dangerous spot right at the edge of his underwear.
But this time it didn’t stop there, it moved forward, tracing a path over the fabric until Izuku placed the palm of his hand over the bulge in his shorts, which Katsuki could now see perfectly in the mirror.
Katsuki bit his lower lip so hard that he tasted blood.
And then, like a fucking marvel straight out of a dirty movie, he watched Izuku squeeze his fat cock between his fingers.
“Fucking nerd.” He panted, out loud, like an absolute moron.
“What?”
“Nothing.”
“But you said–.”
“I said nothing, Shitty Hair. Fuck. Why are you so fuckin’ annoying? Just leave me the fuck alone!”
Kirishima cocked his head to the side, clearly confused by the out-of-fucking-nowhere outburst he just had, at the same time as Mina's head appeared behind him, raising a single eyebrow, looking at him like he had gone completely insane.
And maybe he had.
Because there was no way in hell Izuku had just shown him, only a few seconds ago, the outline of his hard cock in those dangerous shorts.
Right? Right.
He was about to put on his headphones again, not too sure what to do with himself, when he caught a glimpse of Izuku crossing the gym. His green eyes met Katsuki’s red ones for just a fraction of a second before he walked through the locker room door.
Katsuki almost tripped on the dumbbells on the floor as he rushed to follow him in the same direction, ignoring whatever Kirishima attempted to say as he walked away.
The door made a dull thud as it closed, but the sound was drowned out by the loud pounding of Katsuki's heart against his ribcage. The corridor was empty, so was the hall separating the boys' locker room from the girls'. Katsuki turned right, making his way inside, his footsteps echoed softly as he moved forward, leaving the row of lockers behind.
He felt as if his body were moving on its own, with no command or control over each step he took. Hot blood pumped through his veins, surging until it filled his cock, beating, aching. He involuntarily brought his hand to the bulge, groaning softly as his fingers gripped his erection and adjusted it again.
Katsuki stepped into the shower area and stopped dead in his tracks.
Standing right in the middle of the space, with a stupid baby blue t-shirt and those indecent shorts barely covering his legs, was him.
His green eyes sparkled beneath his lowered eyelids, and the tip of his red tongue peeked out as he licked his lips.
What the fuck.
What in the actual fuck are we doing.
“Liked what you saw?” Izuku’s voice reverberated against the tiled walls, and Katsuki braced for whatever was about to break between them.
“I don’t know what you’re talking about.” He said, in a last-ditch effort to preserve his dignity, even though he had been caught red-handed in the mirror, even though he kept staring even after being caught, even though he had a furious and noticeable hard-on stretching his sweats.
“You don’t?” Izuku took a step backwards, widening the distance between them and moving further into the stalls. “Then, why are you here?”
Katsuki dry-swallowed as his throat constricted, his body drawn by Izuku's magnetic pull right in front of him, making him take a step forward. “I don’t know.”
“Come on, Kacchan.” He followed the path of Izuku’s hand with his eyes as it slid down between his legs, stroking his inner thigh and slipping into his shorts, lifting the fabric just a couple of inches and revealing the smooth skin stretched taut over his strong muscles. “Don’t you wanna see more?”
A rush of adrenaline coursed through his body like wildfire, setting off small explosions that sparked in the palms of his hands without being able to stop them. Izuku’s lips curved in a smug fucking smile, and that was all it took for his self-control to go to hell.
The blast echoed sharp inside the room and Katsuki launched himself forward, pushing Izuku backwards to pin him hard against the wall inside one of the shower stalls.
“Ahh—”
Katsuki kicked the door closed behind them, his fingers wrapping around Izuku’s throat, tilting his head upward to force him to look him in the eye.
“Fucking nerd.” He hissed, hot breath licking against his face. “You were doin’ it on purpose.”
It wasn’t even a question at this point, Izuku’s every action had been pretty obvious. That brief look before leaving the gym, the way he rubbed his dick still sitting on the leg press, the way he was looking at him now, half-lidded eyes and open mouth, it was all so unmistakably obvious.
“How could I not?” He purred, leaning forward, but Katsuki held him in place with a strong grip on his neck, thus preventing him from closing the gap between them, as he seemed to be trying to do. “Seeing how much you were enjoying it.”
“You fucking slut.” Katsuki tightened his hold and watched Izuku shiver, a hoarse moan rolling out of his lips. “What if someone else saw you, huh? You were practically jerking off in the middle of the gym, fucking perv.”
“But no one did.” He felt the touch of Izuku’s hand ghosting against his crotch, shooting shockwaves of pleasure through his abdomen without even fully touching yet. “It was just for Kacchan to see.”
“For fuck’s sake, you fuckin’ nerd.”
“Ahhh—” Izuku moaned when Katsuki gripped harder and slammed him back against the wall.
“What do you want?” He barked, getting dangerously close. He could feel Izuku’s breath against his mouth, the thick shape of his cock pressing against his thigh, and he thought, for a terrifying second, that Izuku must be also feeling him against his body.
His starving dick throbbing against his abdomen, and the frantic beating of his heart in his chest.
This was inconceivable – what the hell were they doing here? What on earth were those words coming out of his mouth? But the tension was unbearable, and Katsuki had been holding back his urges for such a long time that he was now deaf, blinded to any reasoning.
His brain wasn't working as it should because all the blood was pooled in his lower abdomen, and the memory of watching those restless fingers tracing the skin of Izuku’s legs…
Jesus fucking Christ.
Those bare, sweaty thighs, the brief glimpse of his underwear.
Fuck.
Katsuki couldn't think. Nothing mattered, absolutely nothing else existed, and if Izuku wanted this, well, so did he.
“Say it, shitty nerd.” He lowered his free hand, spreading his fingers across Izuku’s thigh and holding it up, tracing the same path Izuku’s hand had traced in the gym, soaking his palm in sweat, moving closer to the edge of his boxers and slipping just two fingers under the fabric. “You want me to fuck you? Is that what you want?”
Izuku breathed out a long sigh, biting down on his bottom lip for a second before letting it go.
“Yeah.” He whispered. “I want Kacchan to fuck me.”
“Holy shit.”
He spun him around with a sudden movement, pressing Izuku's face against the tiles and fisting his hand into his green curls.
“Mmmh, Kacchan.”
“Stay there. Don’t you fuckin’ move, you hear me?” He growled next to Izuku’s ear, biting hard onto the flesh of his neck and dragging a cry out of him. “If you move, I’ll spank you.”
“Ahhh… Then I– Mmmh. I might just do that.”
Katsuki pressed his entire body against Izuku’s when he tried to turn back around, heavy muscles and all the weight of his bigger size pinning Izuku against the cold wall.
“You talking back to me?”
“Mmmh.”
“What, nerd? Got something to say?” Izuku groaned when Katsuki grinded against him, driving his hard dick between the covered crack of his cheeks.
“Tell me, Kacchan.” He murmured, his breath hitching when Katsuki pressed him harder against the wall. “How long have you been holding back from doing this?”
“You wanna know?” He brushed his lips against Izuku’s ear, sticking his tongue out to lightly touch him as he spoke. “You wanna know when was the first time I wanted to fuck the senses out of you?”
“Yeah. Tell me. Tell me, Kacchan.”
His blood roared in his ears, his dick twitching at the memory.
Fuck, Katsuki had not thought about that in ages. There was a time when he would jerk off to the thoughts of it, he would feel guilty and disgusting right afterward, and wouldn’t be able to bring himself to look Izuku in the face for a minimum of three days.
Now Izuku was giving him the opportunity to come clean. Or better yet, to sully them both with the filth of his own mind.
“First year. We got grounded for fightin’ on school grounds. Remember that?”
“Mmm–uhhh…”
“I’d jerk off every night to thoughts of you swallowing my dick until you gagged.”
“Ahhh– Kacchan. Please, let me.”
“I said don’t you fuckin’ move.” He pushed his cock into Izuku’s clothed ass again, forcing his hips forward and crushing Izuku’s dick against the wall. “Be a good boy and I might treat you well. Understood?”
“O–Okay.” Izuku whined, grinding back against him.
“That’s fucking right.”
Katsuki kicked Izuku’s heels, forcing his legs open, widening the space between his two thighs before he dropped to his knees, the hard floor hitting him mercilessly, but he didn’t care. He didn’t fucking care. Because Izuku’s thighs were right there in front of his face, muscles twitching when he sank his fingertips onto the flesh.
“Fuck, you’re sweaty.” He grunted before he bridged the gap and sucked hard on his skin, tasting the salty sheen on his legs, leaving a red mark as evidence of where his mouth had been. “So fuckin’ disgusting.”
“Ah! Ahhhh—” Izuku’s voice echoed inside the narrow stall, every moan and every whimper rumbling inside Katsuki’s chest.
He’d drag every fucking sound out of him, he’d sink his teeth into his flesh and he’d bury his dick into his hole until his throat felt raw and dry from screaming, until his name was etched into his vocal cords.
“Shit. Kacch– Aaaahhn.”
“What’re these fuckin’ shorts, huh?” He traced a path with the tip of his tongue, running across the inside of Izuku’s thigh and burying his face into the gap of his pants, lapping at the sweat collected right under the hem of his boxers.
Izuku’s moans slipped out of his mouth like desperate little sobs, his thighs trembling under Katsuki’s touch, hot skin getting coated in spit as he licked viciously, sinking his tongue further, further, further.
“Fucking slutty shorts.” He grunted, pulling just a few inches back so he could drag a finger under the fabric, outlining his muscles, the curve of his glutes, slipping it under his blue boxers and stroking the inside of his crack.
“Ahhh! Kacchan. Fuck.”
Katsuki pinched Izuku’s ass cheek between his thumb and forefinger, tearing a scream from him.
“Watch your fuckin’ mouth, you shitty nerd.” He used the pinch as an opportunity to spread him open. “Thought I told you to be a good boy.”
“I’ll– Ahhh… I’ll be good, Kacchan. I’ll be–.” Izuku’s words died in his throat when Katsuki slid his tongue under the fabric and dragged it across Izuku’s open ass, breathing the musk on his skin, tasting the salt in his sweat, and feeling Izuku’s rim muscles at the tip of his tongue.
Izuku whined pitifully, struggling to keep his legs open and keeping both hands next to his face against the wall.
“Good boy.” He said, his lips brushing against Izuku’s skin before he sank his teeth into his thighs again. “Fuck, Deku. You taste so fucking good.”
Izuku moaned, high-pitched and desperate, and leaned forward, pressing his hips against the wall and seeking friction against his dick, but the movement forced Katsuki’s tongue out of the crook of his ass while he was mid-sucking, still enjoying his feast.
“What the fuck you think you’re doin’”
“But– Kacchan, please. I need– I–.”
Katsuki pulled Izuku’s shorts and boxers down in one swift motion, revealing his round cheeks, and the sharp sound of his hand spanking Izuku’s ass whacked like music to his ears, a pleasant sting burnt on his palm.
“Ahh!”
“I said, stay still.”
“Yes. Yes.”
He forced Izuku’s hips away from the wall, the wet sound of his dick against the tile catching his attention, just to see the trail of precum spilling deliciously down his thick shaft.
And, fuck, Izuku was thick. His cock was standing proud at full hardness, large veins running across his length, the head swollen and flushed in angry red.
“Look at you, drippin’ already.” Katsuki licked his lips, torn between tasting that dick down his throat or carrying on eating Izuku’s ass till it was slick and open for him. “God, you’re so fuckin’ pathetic, Deku.”
“Ahh—”
“Let me see. Fuck, let me see.”
He forced his thighs open just a little further, the shorts and underwear hanging above his knees, stretched out between his legs. Katsuki licked his palm before wrapping his slender fingers around Izuku’s leaking cock, stroking him just once.
“Kacc–aaahhh, yes. So good. Please. Again. Please.”
“You so fuckin’ needy, aren’t ya?”
Katsuki gave him a few languid strokes, and sank his face in Izuku’s ass, leaving hot wet kisses onto his skin, his tongue daring just a few inches further, pushing against the tight rim, feeling it twitch, relaxing and clenching around his tip.
“Ahhh— Yes. Yes, Kacchan. I need– Mmmh… I need you.”
Izuku pushed his hips further into Katsuki’s face, offering himself to him, giving him all the access he needed to dip his tongue further. He whined when Katsuki let go of his dick, a helpless sob crawling up his throat.
Katsuki spread his cheeks further apart, soaking him in spit as he lapped at his hole, his hands started heating up with the rush of adrenaline circling through his veins, smoking faintly as he gripped Izuku’s flesh harder.
The lewd sounds of his own tongue, slick and wet against Izuku’s skin, were driving him fucking insane, as they blent with the moans that slipped out of Izuku’s lips like prayers, his sweet innocent voice tainted with lust, making each sound more lascivious than the last.
Katsuki was rock-hard under his clothes, aching to touch himself, to pump his swollen, painful cock until his flesh was raw, to come with the taste of Izuku’s asshole in his mouth.
But no way, no fucking way. He had other plans for that slick hole.
He stroked himself with agonizing patience, just brushing over the layers of clothes, dragging his own pleasure until he could finally feel Izuku’s tight walls wrapping around his dick.
He’d stuff him at his hardest, with his cock leaking and throbbing, so Izuku could feel his pulse against his flesh, pushing into him until he tasted Katsuki’s dick in his throat.
“Okay, that’s it.” He barked, spanking him again just for the pleasure of watching his asscheek bounce, the shape of his hand blooming red under the freckles.
“Ahh! Kacchan! So mean. Kacchan’s so mean.”
“Shut up. Open your damn legs.” He used his two thumbs to spread his cheeks apart, watching his slick pink hole stretch for him, craving to be filled. “Fuck. You’re so hot, Deku. Fuck.”
Katsuki worked the saliva in his mouth before spitting right into Izuku’s pliant hole, savoring the sight of his white spit dripping out of it. He did it again, and again, before he slid one of his thumbs into it, watching as Izuku’s ass sucked it in nice and easy.
“Ahhhh—” Izuku tilted his head back, the cry that tore out of him was like gravel, scratching against his throat, filling Katsuki with the drive to make it happen again.
“Yeah. You’re gonna take me, just like that.”
He slid the thumb out, and immediately sank it back in, feeling the warm walls of Izuku’s insides against the pad of his finger, working him open with determination. Izuku panted with every stroke, his breaths coming short against the tiles. Katsuki could barely see his face from this position, but he could still catch a glimpse of the drool spilling across his chin.
Katsuki removed his thumb from Izuku’s hole just so he could spit at the opening, and smirked at watching his legs tremble, at hearing him moan.
“You like that, don’t you? Gonna open you up now, Deku. Fuck, my cock is so fuckin’ hard.”
“Ahhh… I wan– I wanna taste it.”
“Don’t fuckin’ care what you want.” He probed at his opening with two fingers, coating them with the spit dripping from his hole before sliding them fully inside. “C’mon, scream for me. Lemme hear you.”
“Ahh! Ahh, nnnhh– C’mon, Kacchan. Is that– mmmh… Is that all you got?”
“Fuckin’ asshole.”
Katsuki stood up, his knees screaming from pressing against the floor for so long, but he took a firm stand as he started hard-fucking Izuku with his two fingers, sinking them all the way to the last knuckle, curling them inside against his warm flesh, searching for the spot that would make him whine.
“Ahh, ahh, ahh, ahh.”
“Yeah, that’s it. Take it. Take it all.”
He gripped Izuku’s hip with one hand, the other moving relentlessly in and out of him while his palm slammed hard against his ass every time he was buried inside.
“Fuck, ‘m gonna stretch you well. You’re gonna take my cock, aren’t ya, Deku?”
“Yeah. Yeah. Fill me up, Kacchan. Fuck.”
Katsuki added a third finger, feeling Izuku’s tight hole clench around them, and resumed the rhythm of his thrusts. Izuku was so fucking hot, bent forward for him, his hands pressed against the wall, face flushed against the tiles, his legs open and his clothes hanging uselessly on his body.
“Fucking hell, Deku.” He hissed, his cock throbbing painfully, feeling his underwear get soaked as he leaked precum into them. “I’m gonna make you feel so fuckin’ good, you’re gonna be rememberin’ my cock for years.”
“Ahh, ahh, ahh, no– nobody can fuck me like Kacchan.”
A jolt of electricity ran through Katsuki’s body, eager and possessive, watching his friend open like this, anger burning white behind his eyelids as he imagined if someone else tried to put his hands on his Deku, tried to sink their fingers in his Deku, tried to cum hot and messy on his Deku’s freckled cheeks.
“That’s right. You don’t want anybody else, do you?”
“Ahh, no– no… nobody else.”
Katsuki bit down a moan, letting it rumble in his trachea. “Only Kacchan’s cock for Deku.”
“Yeah. Please, Kacchan.”
“Who do you belong to?” He barked, fingering Izuku with all the might in his arm, smacking him hard with each thrust, holding him in place with his arm around his waist.
“Kacchan. Only Kacchan.”
Katsuki let go of his waist so he could yank him from the hair, fisting around his green curls and forcing his face off the wall.
“Say it properly. Lemme hear it.”
“I belong to Kacchan. Aahh… Only Kacchan.” He panted, his mouth hanging open, his tongue sticking out, red, wet, and looking so fucking soft that made Katsuki want to taste it. “I’m yours, Kacchan. Yours. Yours.”
“That’s a good boy. Look at you, behaving so good.” He grunted, inhaling the scent of Izuku’s sweaty skin. “When you and I know you’re just a fuckin’ little shit, aren’t you, Deku?”
“Nnnh—”
“Turnin’ me on in front of everyone. Bet you’d like to be fucked out there, so everyone can see the kind of slut you are. So everyone can see who you belong to.”
Katsuki pulled his pants and underwear down just enough, hooking them right under the curve of his ass and freeing his cock. He gave himself a few strokes, spitting on his hand and coating the smooth head, circling around it in a vicious motion.
“F-fuck… God, I’m so hard. Fuck you, Deku. Fuck you.”
“Yeah, Kacchan. Fuck me.”
“Shut the fuck up, asshole.” He spanked him again for good measure and watched him scream, flexing his fingers when they burnt against Izuku’s skin.
Fuck. He might have gone a bit overboard with that last one.
“Oi, Deku. That might leave a mark.”
“Oohh, fuck, Kacchan.” Izuku bent over, spreading his legs further apart.
He tilted his head to the side and locked his eyes with Katsuki for the first time since they started. Hot fat tears were running down his face, clear snot trailing down his nose, his eyes were red and puffy, and his mouth looked swollen from abusing it with his teeth.
“Again, please.” He begged, sending a shiver up Katsuki’s spine.
“Deku…”
“Mark me good, Kacchan.” Izuku sniffed, the tip of his tongue tracing the line of his lips. “So I always belong to you. Please.”
“Fuck. Fuck, fuck, Deku.” Katsuki was drunk, absolutely intoxicated, by his arousal, the blood swelling his cock, the sight of fucking Deku spread and open and crying, begging to be his. “Just once, okay? Only one more time.”
Izuku nodded, his cheek rubbing against the tiles as his head moved up and down. He bit his bottom lip and didn’t take his eyes away from Katsuki.
Katsuki lifted his hand in the air, taking a deep breath, clenching the muscles on his abdomen, measuring how much power he was releasing. His palm cracked once, then he brought it down and slammed it hard against Izuku’s skin.
“AHH!!” His cheek twitched, heat spreading fast, the shape of Katsuki’s hand printed in furious red against his pale skin, every freckle melting into it like they were dissolving into water.
“Fuck, Deku. Fuck.”
Izuku trembled and his knees buckled, Katsuki quickly grabbed him by the hips so he wouldn't collapse. He was mumbling under his breath, something unintelligible Katsuki couldn’t catch for the life of him.
“Deku.” Katsuki’s voice sounded hoarse, caught in his throat. “Izuku, say something. Are you–”
“Thank you.” He mumbled. “Thank you, Kacchan. Nnhh– Kacchan. So good. So fucking good. Thank you.”
“Holly fuck, Deku.” Katsuki felt the air return to his lungs, cold sweat running down his temples. “You’re fuckin’ freak.”
“Thank you. Thank you.” He kept chanting under his breath, spreading his legs apart once again, driving his ass to grind against Katsuki’s cock.
“Kay, ‘m gonna fuck you raw, Deku. ‘S that okay with you?”
“Yes. Yes, Kacchan. That’s good. That’s– I wanna feel you.”
He worked the spit in his mouth once again, swirling it around his tongue before spreading Izuku’s cheeks apart and letting it drool between them, running down his open crack. Izuku gasped, his hole clenching, sucking the spit in before it ran down the back of his balls.
“Fuck. Your hole’s gonna look so pretty when it’s dripping with my cum.”
“Nnnnhhh…”
Katsuki stroked himself painfully slow, licking his palm and tightening the grip around his cock. “Wish you could see it, fuck.”
He spread his legs, his feet pressed hard against the tiled floor, and with the base of his dick firmly fisted, he angled his hips to press the tip against Izuku’s rim. He licked a drop of sweat at the corner of his lips before pushing forward, watching the swollen tip be swallowed by Izuku’s body.
“Ahh, ahh, nnnh—” Izuku grunted as the pink skin stretched impossibly to suck Katsuki’s dick in.
“Fucking hell, so pretty, look at you. Fuck.” He dug his thumbs into the flesh of his cheeks, stretching him further to the sound of Izuku’s pleading moans.
His fingers glided over the coat of sweat soaking Izuku’s freckles, struggling to grip but never deterred, and with every inch sinking into his greedy hole, Katsuki felt a surge of pleasure that made his stomach churn, coursing through his legs, increasing the streams of sweat running down his back.
“Hahh… hahh…”
The soft walls wrapped eagerly around his length, squeezing his shaft.
“Damn it, Deku. Hahh… You’re so fuckin’ tight.” He grunted, holding Izuku’s hips in place to push into him, pressing a hand against his back dimples just to arch him further, and burying himself to the root in a last sharp movement. “Haaahhh… Fuck.”
“Aaahhh”
He pushed back just an inch to spit down on the spot where their bodies connected, shoving his cock back inside. “That’s it. Nnnhh. Fuck.”
“Ahh… Ka– Kacchan.”
“Holy shit, I’m going to ruin you, Deku.” Katsuki rocked his hips, testing the pressure wrapped around his dick, and rolled his eyes back letting himself be consumed by the delicious grip.
His blood coursed through his body like fiery torrents, pulsing in his eardrums, deafening him from the sound of his own voice panting between the tiled walls, his breath coming in gasps that made his chest swell. Katsuki tilted his head back and bit his lips to swallow a moan when Izuku rolled his hips back against him, taking him to the hilt.
“Fuck, fuck. Hahh…”
“Ahhh!” Izuku cried out when Katsuki rolled back and snapped his hips harder against him, picking up the pace, watching his red spit-slicked cock be swallowed by Izuku’s pliant hole over and over and over again.
“Fuck yeah. God, yes. Look at you.” The sound of his hips smacking against the curve of Izuku’s ass echoed against the walls, sending shivers down Katsuki’s spine. “Takin’ me so fuckin’ good, Deku”
“Ahh, ahh, Kacchan, ahh.”
A sheen of sweat coated their overheated bodies, as the temperature kept rising in that confined shower stall, moisture dripping down their skins and making a mess of the spot where their flesh connected, slick and nasty and so fucking delicious Katsuki wanted to taste with his tongue.
He pushed deeper, tearing a soft moan out of Izuku’s throat. “You like that, huh?”
“Faster, Kacchan. Faster.” He choked out, tilting his head to the side, locking his glazed green eyes with Katsuki’s red.
“Hahh… shitty nerd.” Katsuki thrusted mercilessly against him, his tight balls swinging as he slammed brutally against his ass. “Like that? Just like that?”
Izuku was pushed forward, both forearms pressed against the wall with the strength of Katsuki’s powerful hips. “Yes, Kacchan, yes, yes. Ahh— Ahh, ahh.”
“You can take it rough, can’t you? Fuck, Deku.”
He could taste copper in his mouth, thick sweat slipping through the corner of his lips, his eyes locked on the sweet sight of Izuku’s desperate hole stretched out on his cock as he fucked him filthy, brutal, possessive.
Izuku babbled nonsense with his face flushed against the wall, whining in a daze of ecstasy, drool dripping from his parted lips, and Katsuki dug his short nails into his hips, dragging red lines across his skin, making him moan, pounding into his ass like his fucking soul was being ripped from his body.
“Hahh… Fuck, yeah. Hahh… hahh—”
“Ahh, ahh, ahh, Kacchan, so big, ahh, shit. So big.”
"That's right, Deku, fuck. You takin’ it so well, ain’t you?”
His skin was on fire, hands streaming down over Izuku’s sweaty thighs, spreading him open, slamming violently against him as if he could split him in two with the sole strength of his cock shoved up his ass.
Izuku’s legs trembled with the exertion of being bent over by the hip, holding Katsuki’s weight every time he smacked into him, pushing him further into the wall, his hoarse voice sobbing pitifully as fat tears streamed down his flushed cheeks.
“Hahh… Hahh— Fuck, Deku–.”
Katsuki’s heart jumped to his throat when the locker’s room door shrieked and closed with a loud thud. He pushed his entire body forward, sinking fully into Izuku’s hole and pressing him flushed against the wall.
“Ahh—”
“Shut up, Deku.” He hissed into his ear, sticking three long fingers into his mouth. “Shut the fuck up.”
“–telling you, dude. She was totally checking me out.”
“You’re delusional.”
“I think she was just waiting for you to stand up.”
“But did you see the look on her face when–.”
Several voices echoed through the room, things moving, lockers opening, just the usual noise of the locker room when it was filled by people after a work-out session.
Katsuki could feel Izuku’s hot breath on his knuckles, his chest pressed flat against Izuku’s back, a thick layer of sweat sticking them to each other.
“Ahh, ahh.”
“Shut up or I’ll kill you.” He pressed his fingers down his throat, making Izuku gag on them.
“Nnnh.”
“Shhh.” He whispered, pressing further, feeling Izuku’s tight muscles twitching around his cock buried inside him. He dragged his tongue across Izuku’s flushed cheek, tasting the tears on his hot skin. “Quiet.”
Katsuki rolled his hips back, pulling nearly all the way out just to lazily thrust back into him. A shot of pleasure burst through his stomach, Izuku’s body was warm and moist, his skin turning red, every freckle covering his back, his shoulders, his neck, right there at the tip of his tongue for him to taste them.
Katsuki rocked his hips once more time, sliding out and back inside.
He shushed him again when Izuku gasped, murmuring in his ear. “Tell me where you feel me. Can you feel me in your ass?”
“Ahh, ahh… mmh-mh.” Izuku nodded, his throat clenching, accommodating Katsuki’s fingers inside it.
He fucked into him again, just slidding his dick out and sinking it back with leisure. “Can you feel me in your stomach?”
Izuku’s eyes teared up, only inches away from Katsuki’s red ones, never breaking contact.
“Mmh-mh.” He answered, his soft tongue weaving between Katsuki’s knuckles.
He rolled his hips again, Izuku’s perfect hole swallowing him when he pressed his hips back flushed against his ass as deep as he could go and grinding against him, watching Izuku’s eyes roll back into his head. “Can you feel me in your throat, Deku?”
“Ahhh—”
“Shhh. Answer the question.”
“Mmh-mh.”
Showers were turned on, people kept talking, there was laughter and water hitting the tiles, but every sound around them was nothing but background noise to the vicious things their bodies surrendered to.
“Fuck, Deku.” Katsuki whispered, pressing the pad of his fingers against the root of Izuku’s tongue, making him choke to drown a moan he knew was coming the moment he wrapped his other fingers around Izuku’s leaking cock.
He was so fucking thick Katsuki could barely grab it fully inside his fist, jerking him slowly.
“Look, Deku. Look what you make me do, fuck.”
“Ahh, ahh, ahh—”
“Shhh.” He forced Izuku’s head down, so he could watch the movement of Katsuki’s hand wrapped around his dick. “Stop making noise, piece of shit.”
“Mmmmhh.”
“Look, Deku. Fuck.” He whispered, lips brushing Izuku’s ear and making barely any noise and he stroked him hard and sloppy, sweat and precum mixing together to coat his dick in a nasty layer, syrupy between Katsuki’s fingers. “What are you even gonna do with such a fat cock? So fuckin’ useless, aren’t you, Deku?”
“Ahh, ahh—” Katsuki made him choke on his fingers again.
“Fuck. You’re not gonna stick it anywhere. So fuckin’ useless. Such a useless fat leaking cock.”
“Ahhh—”
“Fuck, Deku.” Katsuki rolled his hips again, pumping himself in and out of Izuku’s hole, smacking hard against his asscheeks once, twice. And stopping when he buried himself again. “Fuck, look what you make me do.”
“Kacch—”
“Shush it, shitty nerd. Hahhh… Fuck.” His cock slid nice and sweet, sinking back inside with a slow deep thrust.
He never stopped pumping Izuku’s dick, fisting around it, savoring the sticky sounds of fluids and skin, inhaling the smell of their bodies heavy and disgusting, clouding his every sense.
More laughter. Some yelling. Rattles. Clanks.
Katsuki rocked into Izuku again, seeking the crook of his neck, viciously licking the beads of sweat resting there, sinking the tip of his tongue into the dip of his collarbone.
“Such a good fuckin’ boy.” He tightened the grip around Izuku’s shaft, his thumb sliding across the slit, spreading precum and massaging the swollen head of his cock.
“Ahh, ahh, ahh—” Izuku’s voice was just a whisper, breath hot on the skin of Katsuki’s hand, drooling heavily down the knuckles, the wrist, and all across his chin. “Nnnnhh—”
He whined when Katsuki bit hard on his freckled cheek, pools of tears falling from the corner of his eyes.
“Want me to move?” He brushed his lips over the shell of his ear. “Want to feel my cock fucking you?”
“Mmh-mh… yeah. Kacch—” Izuku threw his head back against Katsuki’s shoulder when he thrust hard, slamming into him without mercy.
“Fuck, Deku.” He did it again, and again, pushing Izuku’s body hard against the wall, watching as he struggled to breathe with his chest pressed against the tiles and Katsuki’s fingers deep inside his throat. “Fuuuck— Deku.”
He fucked into him with reckless abandon, blinded by the sweet scent of Izuku’s skin and the hot grip around his cock, forgetting about anyone at earshot, the sounds of his hips slamming against Izuku’s ass muffled by the running water as people showered in the stalls next to them.
“Look what you’re makin’ me do, shitty Deku.” Katsuki was consumed by the flames licking up his spine, gripping Izuku’s chin with his hand, forcing his mouth open, fucking him so hard the pleasure was starting to shake him like thunder. “Fuck, you’re hot. So fuckin’ hot, Deku.”
“Ahh, Kacch’n, ahh, ahh, ahh.”
“Shut up. Shut. Up.” He emphasized every word with a violent thrust, knocking Izuku’s head against the tiles, pinning him with the weight of his body as he grinded against his ass, his dick buried inside him.
Katsuki clenched his teeth, tightening every muscle in his abdomen, in his thighs, holding the surge of pleasure that threatened to explode inside his body. He wasn’t done. Not yet. Not fucking yet.
He finally withdrew his fingers from Izuku’s mouth, soaked in spit that he used to jerk him off some more, the thick veins running the length of his cock throbbing under Katsuki’s touch. Izuku’s dick twitched when hot precum spilled from its tip.
“Don’t you fuckin’ dare.” He growled, closing his fist around the head of Izuku’s dick, squeezing it rough into his grip. “You’re not coming until I tell you.”
“Ahh–mmmmh—” He whined, muffling his voice by slapping a hand over his mouth.
“That’s right. Good boy.”
Katsuki locked Izuku in his arms, his chest pressed against Izuku’s back, and the sweat running down from his scalp mingling with the sweat on the back of Izuku’s neck.
He breathed heavily against Izuku’s cheek, tasting hot tears in his lips, waiting patiently for the showers to turn off. He thrust into Izuku once. The voices started fading away.
Katsuki kept Izuku pinned against the wall, pressing down on his back with one hand. He clenched the hem of his tanktop between his teeth, getting a perfect view as he rolled his hips again, pulling back and sinking into him again.
Lockers closing. Steps retreating.
Katsuki rocked back, sliding his length just half the way out, watching Izuku’s rim clench and twitch around his shaft. A primal growl rumbled through his chest when he buried his cock into Izuku’s stretched hole, keeping his eyes locked on the way the swollen flesh slid out, dragging spit and precum with it, before sinking back inside.
“F’ck.” His grunt was muffled by the fabric between his teeth. “F’ck, ‘t’s so f’ckin’ hot, D’ku. Wish y’ co’ld see this. F’ck.”
“Ahh, ahh, ahh—”
The door of the locker room closed with a loud thud and Katsuki stopped, fully buried inside Izuku, holding his ass flushed against his hipbone, sharpening his senses, listening for any faint sound that might indicate there was still someone inside the room. Or if, at last, they were alone again and he could finally fuck the senses out of Izuku, letting him scream until his voice was hoarse and until his last breath left his chest.
Izuku rocked his hips back, forcing his dick just a few inches out and slamming his ass back against Katsuki’s hips.
“Would you– hahh… Would you wait for a fuckin’ second?”
“Can’t. Kacchan, I– ahhh… ahh… I can’t–”
“Fucking needy piece of shit, Deku. Fuck. Fuck.” He gripped him by the waist, smacking hard against him, peaking up the pace and driving Izuku’s hips back and forth to give himself a rest while Izuku’s ass fucked itself onto his cock. “Hahh, hahh, hahh…”
“Ahh— Kacchan, ahh, ahh… I am– ahhh I’ma–”
A shockwave struck him like the heat of an explosion going off inside his chest when Izuku’s walls twitched hard around his cock. His body aching to surrender to the feeling pooling in his abdomen, to fuck senselessly into Izuku until he was dripping with his cum.
“Fuck, no. Deku, shit.”
“Ahhhh!” Izuku yelled when he suddenly pulled his dick right out of his ass, his empty hole clenching on thin air. “Turn around. Fuck, Deku. Turn around. I wanna see your face when you come.”
He slapped Izuku’s asscheek once and spun him around, pulling off his tanktop and tossing it aside, removing Izuku's baby blue t-shirt as well. Katsuki hooked both hands under his muscular thighs and lifted him into the air, slamming his back against the wall.
Katsuki held him up, using his own body weight as leverage. “You’ so fuckin’ heavy.” He grunted as he gripped his cock and aligned it to Izuku’s entrance, sinking deep and easy into him once again.
“Ahhh— Kacchan, so good like this. Shit. Fuck.”
“Fuckin’ nerd. You like it?” He kept Izuku against the wall, watching him drool and cry with his head tilted back, his flushed neck fully exposed for him. Katsuki fucked into him with desperation, Izuku’s leaking cock slamming frantically against his abdomen. “Like this? Like this?”
“Yeah. Ahhh, Kacchan. Keep going just like that, shit. Ahh… ahh— Gonna make me come.”
“That’s right. Fuck, Izuku. Hahhh— Come for me. C’mon.” He kept thrusting, his cock rubbing hot and swollen against Izuku’s prostate, watching him come undone in his arms, his thighs shaking, choking on his own spit as he sobbed. “Hahh, hahh… ‘M gonna fill you up, gonna make you taste my cum up your throat.”
“Ahh, ahh, ahh…”
In a sudden movement, Izuku raised his arms and grabbed Katsuki by the hair, digging his fingers into his scalp, pulling hard on the strands at the nape of his neck, forcing their eyes to meet.
“Look at me, Kacchan. Look at me. Ahhh, ahh…”
“Fuck, Deku. Fuck. C’mon. Haahhhh. Just like that, baby. C’mon.”
“Ohh, ohh. Shit. Kacchan. Aahhh—” Izuku’s voice cracked at the sound of his orgasm tearing his whole body apart, fat tears streamed down his red cheeks and he sobbed, over and over and over again, while Katsuki never stopped thrusting into him.
He licked his lips at the sight of Izuku’s thick cock twitching, coming hard, hot ribbons painting his abdomen and spilling over Katsuki’s chest, holding Izuku in the air while he fucked him stupid, becoming nothing but a fucking mess of cum and spit and sweat and tears.
Katsuki’s release hit him like a truck, bursting through his stomach and crawling up his chest, stealing the air from his lungs while his throat turned sore from grunting and panting, high-pitched noises that he had never made before in his goddamned life.
And through it all, Katsuki kept his hips going, fucking hot cum into Izuku’s body, feeling it drip thick and slick across his crotch and down his thighs. He buried himself inside and pressed Izuku against the wall, his hips jerking as he rode his orgasm, sobbing like Izuku’s hole was sucking the life out of him.
“Hahh… hahh… hahh…”
“Ahh… ahh… ahh…”
He breathed into the crook of Izuku’s neck, spit drooling out of his mouth, and dampened Izuku’s already wet, already sweat-soaked skin. He could hear Izuku catching his breath, his plumped lips stroking softly against Katsuki’s cheekbone and his chest pressing against his own. Their hearts were pounding so hard, beating in sync, that it was impossible for him to distinguish one from the other.
He turned his head, daring to pull it away from the safety he’d found in the crook of his neck. Izuku was looking at him, his green eyes sparkling as if a million stars were trapped inside them, still teary and weary.
Katsuki shared his breath with him, inhaling the warmth of his mouth, taking in every detail of his face, every freckle on his skin, and fixing his gaze on his parted lips, red, moist, and swollen.
Katsuki stopped thinking then, every thought obliterated, just Izuku. Midoriya Izuku in his arms, and Katsuki pressed his lips against his, tasting him for the first time in his entire life, tracing every corner of his mouth with the tip of his tongue, swallowing the moan that climbed up his throat, dancing with him in slow, lazy movements, simply letting himself be enveloped by the heat radiating from Izuku’s lips.
“Ahhh…” Izuku exhaled a content breath when they parted and Katsuki slid out of him, returning his feet back to the floor.
“We made a fucking mess.” He murmured, his head spinning and every muscle in his body aching now that the high was receding.
“Yeah.” Izuku pressed another kiss against his lips, humming with his eyes closed. “It was worth it, though.”
“Fuck yeah, it was.”
“Mmmh.” He felt Izuku's round nose nuzzling against his cheek as he was still trying to catch his breath and calm his racing heart. “Wanna grab some lunch, and maybe go for round two?”
Katsuki’s head snapped up, eyes opening wide. “Holy shit, nerd. You’re insatiable or what?”
Izuku bit his bottom lip, the blush that was starting to fade from his face returned at full force.
“That didn’t sound like a no to me, Kacchan.” He murmured.
Katsuki clicked his tongue, gripping Izuku’s chin with his hand and licking his lips, wet and nasty. “If I ever say no to fucking your beautiful face, I beg you to pull the fuckin’ trigger.”
Izuku’s laugh rang just like bubbles of glee rolling off his tongue, and Katsuki thought, maybe this wasn't such a bad way to relieve the stress leading up to their final exams.
Maybe even to celebrate once they were over.
Or to kick off the weekend.
Fuck, or just to go to sleep every night.
“C’mon, nerd. Let’s wash up so we can go get that lunch.”