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The digital clock on the stove read it was just after midnight. With a sigh-turned-yawn, Izuku flicked the range light off and wandered into the darkness.
Grading these tests had taken far longer than anticipated, and he was a little bitter he got to spend so little time with Kacchan after he got home from patrol. But, a handful of his students hadn't fully answered the questions, or bullshit their way through it altogether so naturally, their grading took up the most time – mostly because Izuku was trying to wrack his brain on how these particular students managed to flub so badly. He was going to have to talk with them about it, and that only grated his nerves more.
He was feeling moody and kind of bitchy. All he wanted to do was crawl into bed with his already sleeping partner. Which is exactly what he planned, once he finished stripping and cleaning himself up.
Slipping into the bedroom, he found it toasty and filled with the condensed scent of Kacchan's natural scent; a warm musk, entwined with something both sweet and spiced. It made Izuku relax almost instantly as he padded to his side of the bed, marveling at its gorgeous occupant, eyes nearly adjusted to the barely illuminated light of the room.
The blond was stretched out on his back, one arm thrown carelessly onto Izuku's side, while the other was being used as a makeshift eye mask. The blanket had been shoved off at some point, left pooled over his naked, narrow waist, exposing that delectable torso of hardened muscle and scars.
Having been pushed away in his sleep, the fabric covering Kacchan's pelvis was warped, exposing a deep slit of satiny skin and a thatch of pubic hair.
The reaction to seeing Kacchan like this – so exposed and vulnerable – was always the same; mouth falling open as his breath caught, heart pounding in his ears while his stomach flip-flopped, the extra blood heading south on sight. Sleep had long fled his mind.
Slipping into bed, cuddling right up to the blond's side, Izuku's hands continued on, slipping over heated, naked flesh. Kacchan's skin was like silk beneath his touch, impossibly soft despite the elite, hardened physique it covered.
Smoothing a palm over his abdomen, Izuku relished in the feeling of each defined muscle, prominent even when the man was relaxed. He lavished over Kacchan, dragging his fingertips over every ridge and dip, moving further down until he met V-lines.
Only then did Kacchan stir in his sleep, grumbling and instinctively pressing closer to Izuku. Kacchan was very sensitive there, afterall.
Sharp cut muscles beautifully framed those perfect hips and treasure trail, leading down, down, down, until the prize was obstructed from view by the barely-there-bedsheet. Leaving it in place for now, Izuku dragged his fingers further along Kacchan’s pelvis, through that thatch of curly blond hair, continuing until he met the warm, pliant, velvet he was borderline desperate for. Dropping his head, he pressed slow, unhurried, open-mouthed kisses along the man’s collarbones and chest, laving his tongue over heated skin that still tasted faintly of soap. Below the cover, Izuku’s hand was wrapped loosely around Kacchan’s length, stroking him gently as he grew and hardened in his grip.
Beneath Izuku, Kacchan’s breaths were growing sharper and shorter, catching as he groaned. “‘S’late, Iz-ku,” Despite his sleep-adled words, he wrapped an arm around Izuku’s neck and knotted his fingers in his hair, holding him closer as he continued his downward descent.
“I know. But I missed you.” Settling into Kacchan's hold, Izuku dragged his tongue over Kacchan’s peck until he met that tawny pebbled nub and closed his mouth over it, pulling another soft moan from above him. Flicking his tongue against the hardening nipple, he propped himself more securely on his elbow to have better control of his other hand, continuing the slow assault on his pulsing cock.
He kept his grip loose and strokes languid without lube, using mostly just his palm in a way that hit the tip of Kacchan’s cockhead, where it was just barely too sensitive for him and always had him oozing. Izuku knew he was hitting the right spot with each upward stroke because Kacchan’s hand was progressively tightening in his hair as his breath grew ragged. Above the covers, he was dragging his tongue and teeth over the man’s nipples, giving each the same amount of attention until they were an angry red, hard as hell, and glistening with Izuku’s spit.
Izuku shifted down the mattress, kissing, licking, biting, and sucking over the other man's sweltering skin, leaving a slick trail of blooming red marks in his wake. The noises it elicited from the blond was good as pouring gas on a fire, the way it sparked that insatiable drive within him. He always had to be the absolute very best for Kacchan, because he deserved nothing less. Especially when it came to pleasuring him.
Having no choice but to release his hold on Izuku as he descended lower, Kacchan swore under his breath, settling instead for a better grip in cadmium strands.
Reaching his final destination, he finally threw away the sheet as he maneuvered himself between Kacchan’s deliciously solid legs, elbows propped on either side of his tapered hips. With his hand temporarily stilled, fingers wrapped around the girthy base of Kacchan's fully erect cock, he took a long lick, molding his tongue to the underside right to the dripping tip.
A broken moan escaped the man's lips, effectively dumping the proverbial jerrycan over already raging flames.
Izuku laved his tongue around Kacchan's head, collecting and relishing in the sweet, salty taste of his pre-cum, before popping the smooth, bulbous head into his mouth fully. Swallowing around the thick, hot, heavy weight of Kacchan's cock, he worked his tongue over the silky skin until his lips could slide with ease.
With his free hand, Izuku caressed over Kacchan's groin and hip, teasing him with barely-there pressure along his sensitive spots until his hips were trying to snap up, carelessly shoving his cock down Izuku's throat. Tears were building in his lashline as he let himself be choked out on the other man, but it was perfect. It was exactly what Izuku wanted. Needed.
Sucking Katsuki off when he was still half asleep was such a treat – his inhibitions were lowered, reservations less guarded, and the breathy “ah, ah, ah, ah,” rushing from his mouth had Izuku fighting not to bust where his own straining cock was pinned against the mattress.
Abandoning his teasing, Izuku ran his hand up and over Katsuki's torso, latching onto a still-hard nipple to roll and pull on it. His other hand, now useless with Izuku's nose buried in Kacchan's pubes, made its way to cup his tight balls and smooth the collection of drool further south.
At the first brush against his fluttering hole, Katsuki groaned while both hands, having found real estate in Izuku's hair, tightened further. “Fuck, feels so good Izu,” he rasped, voice thick with sleep and lust as he took a little more control of Izuku's mouth and pace. “Gonna cum down your pretty throat if you keep it up.”
Katsuki's words sent a hot thrill coursing through Izuku's body, traveling straight to his painfully hard dick. But, it only stoked the raging fire in his veins and he pushed further. Spit wasn't going to get him far, but it was better than nothing for the time being.
He slicked over Katsuki’s hole again and again, spreading the saliva until he could just shallow him with a knuckle, preening when the man's back began to subtly arch away from the bed.
After a moment, a huff came from above Izuku, and one of Katsuki's hands vanished from his hair as he reached for the bottle on the nightstand and chucked it unceremoniously Izuku's way.
Wasting no time coating both his fingers and Katsuki’s ass, all while his mouth continued its assault over his cock, Izuku sunk his middle finger into him. He watched with rapt, carnal desire as his boyfriend's face twisted up with its own ecstasy the further he pushed in, slowly and gently curling his finger upwards to brush against that golden button.
When Kacchan was pliant enough to let him in a little deeper, Izuku angled his hand, pulling his finger in and out in a slow drag that hit his prostate with each motion. In his mouth, Kacchan was pulsing stiffly against his lapping tongue, his balls tightening and receding in tandem. Above him, the blond had his head tilted to the side, jaw slack as he moaned out a garbled combination of “fuck,”' and “Izuku,” hands knotted like vicegrips in his hair. It hurt to an extent, but Kacchan knew to grab close to the roots, and the slight sting only made Izuku ridiculously hornier for the man.
Finger sliding into the hilt each time, with no resistance, he slowly added another, gently working both of them inside as he scissored Kacchan open, mouth still swallowing down every generous last inch he had to offer. Each broken cry, ragged moan, choked sob, and incoherent word uttered pushed Izuku further to the brink of insanity – he had no clue how he was controlling himself so well when all he wanted was to bury his cock in Kacchan’s ass and fuck him raw until he came. Maybe it was because of how much he seemed to be enjoying what Izuku was doing to him, or maybe it was simply because of the fact that he fucking loved doing this to Kacchan.
He loved slowly working him open, the feeling when the blond’s hot, impossibly tight walls began to loosen and stretch around his fingers, accepting him into his body and pulling him deeper. He loved the way each time he stroked Kacchan’s prostate, his cock would cry a pretty stream of pre-cum, and could even get him off like that untouched. Though, Izuku could rarely help himself. He was obsessed with the man’s cock. Worshipped it, really. With his hands, his mouth, his own cock, his own ass when they switched. Any possible way Kacchan wanted it, Izuku would give it to him without a second thought.
When both his fingers could thrust freely, Izuku picked up his pace, further angling his hand to sharpen his accuracy. He could feel a trail of warm liquid making its way down his throat, swallowing around velvet steel to taste Kacchan. “Izuku,” the blond practically whined as his hips jerked forward, lower back arching. “Gonna cum down your fucking throat so fucking hard, oh my fucking god, Izuku, ahhhh fuck, gonna cum, gonna cum, fuck baby you’re gonna swallow this all so fucking good aren’t you? Yeah you fuckin’ are, gonna swallow every last drop I’m gonna give you like the dirty little whore you are-” His breath caught, choking off his lust-fueled babbling, entire body going rigid.
Izuku had been slowly picking up pace until he was fucking into Kacchan’s ass with little forgiveness, mouth sliding up on his thick member until just the swollen head remained. He focused his efforts on just the tip, sucking and lapping his tongue from seam to split over and over again. When he’d moved his other hand from the attention on his nipples to cup and faintly tug on Kacchan’s sack, it sent him toppling over the edge.
The moment Katsuki's body seized, he was pulsing around his fingers and in his mouth, spilling hot ropes of cum down Izuku's throat, just like he promised.
He hummed in pleasure as he swallowed down every last drop, making sure to milk the man completely dry for his own perverted satisfaction.
Katsuki was panting, his entire torso heaving with heavy breaths, but he was conscious enough to carefully unravel his fingers from Izuku's hair. “Spread me wider; want you to cum in me.”
Slipping his mouth off Katsuki slowly, so as not to overstimulate his sensitive flesh, Izuku worked himself a little further down the mattress and slid his arms beneath Katsuki's thighs. He definitely did not need to be told twice as he hooked them over his shoulders, Kacchan already shifting his feet to brace against his back.
With his hands free and Kacchan offering himself up so willingly, Izuku took handfuls of the man's perfectly toned ass and spread him open, preening when a beautifully hoarse sound blessed his ears in response.
Another benefit to fucking a sleepy Kacchan – he was a lot more vocal than usual, and Izuku just loved when he got the pleasure of hearing it.
Licking his lips at the meal in front of him, Izuku said a mental “itadakimasu,” before diving in tongue first.
The lube didn't taste great, but they only ever got something water based and safe for the addition of oral play, so he ignored the initial bitterness and lapped until he could taste nothing but Kacchan on his tongue.
Before his man could start snapping at him, he returned his fingers, sinking them eagerly back into the blond where they were instantly accepted.
“Fuck, can you jus’ fuck me already?” Kacchan whined and thrust himself against Izuku, drawing his attention to the glistening hardness twitching against the blond's pelvis.
A possessive warmth filled Izuku that he, and he alone could get Kacchan hard again this quick. Even touching himself, Katsuki took ages to work back up. “Mmm, look at you though – you're so beautiful. Taste so good, Kacchan.”
Apparently not liking Izuku's teasing much, the blond arrogantly walked his feet onto Izuku's shoulders and gave him a slight shove back. “Fuck. Me. Already!”
He rolled his eyes and let himself be pushed, finally giving in and wiping his mouth as he stared, amused. Kacchan was laying there with his arms crossed almost petulantly, lips pulled into what could be described as nothing but a pout. Even when bottoming, he was bossy as ever. “So demanding,” Izuku laughed softly, pushing up onto his knees, Kacchan's feet still on his shoulders.
The relief of not having his aching cock smushed between his full body weight and the mattress was blissful, but he was so understimulated he was afraid he wasn't even going to make it in – let alone fuck Kacchan. “Damn, I'm so close already.” He admitted, shuffling closer to Kacchan, folding him up in the process.
A warm palm appeared on his cheek, cradling him with a gentleness that contradicted all the harshness. “S'fine, Izu, just want your fucking cum in me.”
Oh, fuck, okay.
Nearly fumbling the lube bottle in his haste, he somehow managed to get himself and Kacchan well coated without losing it, and finally, finally, began his slow push in.
The very brush of his tip against Katsuki’s pliant hole had him nearly drawing blood, how hard he bit his lip, and eventually tasted copper when he was fully seated.
He had to think of every foul, nonsexual thing under the sun, just to keep himself from paying too much attention to the feeling of being balls deep in Katsuki. The warmth wrapped around him like a fucking python was an uphill battle in itself.
“Feel way too good Kacchan,” Izuku breathed, just barely shifting his hips, letting his hands trail over Kacchan's powerful legs and soft skin.
The man made a humming sound in the back of his throat, and his hips were rocking slowly, ignoring Izuku's warnings. Or heeding them, maybe. Whichever, he didn't relent, instead beginning to fuck himself on Izuku.
“K-Kacchan, I'm too close, I'm gonna cum if you keep-”
“That's the point,” the man grunted, sliding his hand from Izuku's cheek to his hair once again.
“A-ah, you want my cum in your ass that bad, do you?”
“Fuck yes.”
Grabbing hold of Katsuki's hips with a bruising force, he slowly dragged himself out, hissing all the while, before slamming home again. His pace quickly grew erratic and jerky, fueled by the filthy words and sounds leaving the blond's mouth. The paralyzing, blinding, white-hot heat exploded through him, vision blacking out as he came as deep in Kacchan as he possibly could.
Izuku could hear him coaxing him through his orgasm, telling him how good he was and how much he loved being filled – claimed. It made his eyes roll back in his head, somehow doubling the pleasure that crashed in seemingly never ending waves. He wasn’t sure if he’d ever ridden out an orgasm this long – the oversensitivity having yet to take over. Even when it did, his pull out of Kacchan was slow and deliberate, making sure the blond was comfortable and ready.
As much as Izuku loved finishing in his man, it was always such a mess to clean up.
“Be right back,” Pressing a kiss to Kacchan’s sweaty forehead, Izuku hurried off to grab two warm, wet face cloths, and a dry towel. When he returned, he focused on his boyfriend first, gently wiping him clean while peppering kisses over his bare thighs and hips. Just as much as he loved having sex with Kacchan, he also loved the aftercare that came with it – no matter which of them it was. He’d pamper Kacchan like that all day long if he could anyway; this was just a great excuse.
Only after the fully satiated, and nearly asleep blond was fully cleaned, dried off, and thoroughly doted on with Izuku’s affection, did he focus on getting himself cleaned up. Maybe Kacchan would have scolded him for being gross any other time, but tonight…
Sleepy Kacchan.
Izuku smiled, painfully fond and full of unwavering love.
Now he could sleep.