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Izuku stumbled away from the common room, using the wall to hold himself up as the hallway swayed. Behind him, his 18th birthday party had wound down to a drunken slumber party, with nearly the entire class passed out around the sofa and on the floor.
It had been a noisy and fun night of drinking games, loud chatter, and a couple of quirk misfires that resulted in a power outage on the tv thanks to Denki and over one thousand playing cards strewn about thanks to Momo, all of which had been floating in the air at some point of the night like a strange poker confetti until Ochako fell asleep under the coffee table with Tsuyu.
It had been his best birthday ever. He did feel guilty that they were all drinking underage, but Mineta had brought some of his dad’s favorite bottles, as a gift directly from his dad who owned a gentlemen’s club with a well stocked bar, which explained a lot, honestly, and Mina had been excited to try mixing drinks to see if she’d make a good bartender. Most people agreed she didn’t. However, Tenya, of all people, had taken over and explained that alcohol was just like a chemistry of flavors, and had not only made them all delicious drinks, but monitored each of their intake so no one ended up wasted. It was his way of not being a buzzkill, literally, while still trying to maintain some level of responsibility.
Despite his exhaustion and current state of drunkenness, though, Izuku just couldn’t sleep out there with Mineta's snoring and Shouto’s incoherent talking in his sleep, which apparently did not bother Momo sleeping on top of him in the slightest, but that Izuku could just not tune out. He really just wanted to go to his own bed and pass out.
He stopped by the bathroom to relieve himself, wash his hands, and decided to brush his teeth while he was there. Just because he was drunk didn’t mean he wanted cavities. It was a difficult task and he missed his mouth twice before finally jamming the toothbrush against his gums. He kept his unfocused gaze on his messy hair as he brushed, taking extra long to make sure he wasn’t careless. By the time he was done, he was almost ready to pass out while standing up.
Izuku left the bathroom and staggered back down the hallway. When he finally, finally , reached his door, he almost just decided to lay down in front of it and sleep there, forget trying to turn the knob. But his soft bed was so close. It would feel so good.
Thankfully, he had left his door unlocked, a bad habit that Tenya was often chastising him for, but he honestly never felt it necessary. It’s not like any of the students he had spent three years studying with would steal from him. Even if they did, he’d only want to talk to them about it, he couldn’t really bring himself to be angry at any of them.
Izuku got inside the dark room and gently closed the door, not bothering with the light. He kicked off his shoes and tugged off his shorts, leaving him in his boxer briefs and the All Might t-shirt Ochako had given him as a gift earlier in the day. He fumbled around the room to climb into bed, collapsing onto the mattress in relief.
His bed was very lumpy. And incredibly warm. And it groaned as he prodded his fingers and legs against it.
“What the fuck…” His bed spoke with a low, sleep-heavy grumble. Izuku groped into the sheets to figure out what the heck was going on, when suddenly the body that was lying next to him jerked away in alarm. “What the fuck!”
“Kacchan?” Izuku slurred. “What are you doing in my bed?”
“What the fuck , Deku?!” Katsuki spat. “Get the fuck out of my bed!”
“Kacchan, this is my room…” Izuku pulled the sheets over himself and buried his head into the pillow Katsuki had just vacated. Katsuki growled and pushed Izuku forcefully in an attempt to drop him out of the bed, but Izuku was all dead weight. Then Katsuki felt Izuku’s hand bunched in the sheets, holding himself tight to his spot.
“Deku, I swear to fucking god, I will fucking murder you if you don’t get out of my bed right this fucking second!” Katsuki hissed, leaning over Izuku in an attempt to pry him off the bed.
Izuku sighed in heavy annoyance and stubbornly bounced closer to Katsuki.
“This is my bed, Kacchan,” Izuku grumbled. Then he looped his arm over Katsuki’s waist, causing the young man to freeze in shock. “But I’ll let you stay since it’s my birthday.”
Izuku yanked Katsuki toward him, causing his arm, which he was holding himself up on, to knock out and he dropped back with an oof.
“ Deku …” Katsuki rumbled, rage building up in his chest. Izuku ignored it completely, nuzzling his face against Katsuki’s bare shoulder.
“I missed you, Kacchan,” Izuku murmured, sliding his hand up Katsuki’s side. Katsuki felt his entire body heat up in embarrassment. He slept barechested every night, only wearing a pair of boxer briefs, and Izuku was being alarmingly intimate. But the softness of his next comment stopped Katsuki from blasting him across the dark room. “I wish you had come tonight.”
“Why the hell would you wish that?” Katsuki asked in agitation. It was no secret that after three years, while he and Izuku had developed a sort of mutual respect and understanding, Katsuki still couldn’t stand the fucker. They just didn’t mesh well and had different circles of friends and different interests. And Katsuki still found Izuku’s “do your best!” attitude to be the most obnoxious fucking thing he ever had to witness.
“Cause I missed you,” Izuku sighed, cuddling closer.
“O-oi...stop it…”
“You’re so warm, Kacchan…”
“No shit, that is literally my quirk. Get off me…”
“Shh, go to sleep.”
“Listen here, you little shit-”
“Goodnight, Kacchan. I love you,” Izuku clumsily shifted closer and pressed a gentle kiss on Katsuki’s cheek, causing Katsuki to mentally shut down, frozen like a statue made of ice. A second later, Izuku’s soft breaths fell into a steady rhythm against Katsuki’s neck.
Katsuki lay in the dark, completely bewildered and lost, desperately trying to compute what had just happened. His eyes were beginning to adjust and in the soft green glow of his alarm clock on his nightstand, he could make out the messy locks of Izuku’s hair and the strong slope of his neck and shoulders.
He should just push him on the floor. Now that Izuku was asleep, he wouldn’t be able to fight against the force.
And if he was going to let Izuku actually stay there, Katsuki should at least go sleep on the floor himself. He felt uncomfortably like he was going to get accused of something indecent and didn’t want Izuku, or anyone, to think that about him.
But Izuku’s hold on him was like stone. Katsuki pried at Izuku’s arm, trying to get him to let go of his waist, but it seemed the harder he tried, the harder Izuku held on. How the hell was the little fucker so strong in his sleep? In his drunken sleep!
Katsuki sighed and fell back, giving up the fight. He was stuck. His clock said it was three-ten in the morning. He just wanted to sleep.
He laid there for a long time, staring up at the ceiling in the murky darkness, until he turned his head to look at Izuku again. The other young man was sleeping so soundly, so relaxed.
He couldn’t explain why and he tried not to think about it too hard, but slowly Katsuki lifted his hand that wasn’t pinned by Izuku and gently threaded his fingers in those green locks. Immediately Izuku pressed into the touch, then slid a leg up and over Katsuki’s hips. Katsuki’s heart leapt in his chest and he swallowed thickly.
“Deku,” Katsuki called out, jostling him. “Deku, wake up.”
Izuku responded by burying his face against Katsuki’s neck, pressing his lips into a slack kiss on Katsuki’s hot skin.
Katsuki cursed under his breath and rubbed his hand over his face. How the hell did he get into this situation?
Just as he was about to resign himself to his fate and try to pass out despite Izuku half crawling on top of him, Izuku’s hand slid along his side. Katsuki’s muscles twitched under the touch and he thought it would be a brief shift, but then Izuku’s hand slid back up, then down again. Katsuki’s breaths shallowed as Izuku slid his leg between Katsuki’s.
And then Izuku sighed out a soft moan, saying Katsuki’s nickname heavy with desire.
“Kacchan,” Izuku breathed out again. “Mmm, you feel really good.”
“S-stop it,” Katsuki tried to snap. “Are you awake?”
“Hm?”
“Get the fuck out of here, will you?”
“S’my room…Stay with me…” Izuku brushed his nose up and down the side of Katsuki’s throat coaxingly.
“Fuck…” Katsuki breathed, closing his eyes and trying hard not to react to Izuku’s touches. His muscles twitched and quivered and he couldn’t help sliding his legs apart a little as Izuku’s knee slid up between them. “Deku, please…”
Izuku understood wrong and, instead of stopping like Katsuki was asking, he kissed Katsuki sensuously on his jaw, sliding his tongue out to lick him.
Katsuki tipped his head back and moaned softly.
Suddenly Izuku jerked next to Katsuki, coming fully awake at the deep sound of Katsuki moaning in pleasure. He felt instantly sober and his mind spun trying to piece together what the hell was happening.
Katsuki was lying almost naked next to him. No. Practically underneath him. And he was panting hard. In the dim light, Izuku could see Katsuki had a hand held over his eyes, trying desperately to keep his composure.
When Izuku obviously didn’t kiss him again, Katsuki let his hand drop away above his head and turned his face to focus on Izuku’s eyes reflecting the little light in the darkness. They lay like that for a very long time, staring at each other, breathing unsteadily.
“Get the fuck out,” Katsuki breathed, his voice husky and delicious.
Izuku hesitated, his eyes wide and still a little bit daring, still edged with that liquid carelessness he had drank all night. Instead of listening to Katsuki’s command, he cautiously slid his fingertips over Katsuki’s bare abs. Katsuki shivered, lifting his hips a little as if he wanted Izuku to explore more, but his hand shot out and gripped Izuku firmly by the wrist.
“You’re drunk,” Katsuki said roughly.
“...And what if I wasn’t?” Izuku whispered.
Katsuki tilted his head back and rubbed his face with his hand again. A dark, helpless laugh escaped him.
“Just go the fuck to sleep, at least. You're killing me.”
Izuku listened to him. He gently removed his leg from between Katsuki’s, relaxing on the pillow they were now sharing, wanting to explore the lines and planes of the body next to him, especially when Katsuki sighed in relief when Izuku gave him some space. But he didn’t want to be thrown out completely. His mind was still fuzzy. He couldn’t piece together how he had ended up in Katsuki’s bed or how he had gotten so carried away that he was all over the angry blonde. But he knew for a fact this was the most delicious warmth he had ever felt in his life and he didn’t want to be pushed out of the bed. If Katsuki was going to let him lay there, sleep there, even, Izuku was going to do his best not to piss him off.
Slowly, Katsuki relaxed, too. Izuku left his arm laying over his torso. Katsuki knew he could throw it off now if he wanted, but he liked the weight. He decided not to think too hard about that. When he was sure that neither he nor Izuku were going to do anything they would both regret tonight, he exhaled deeply and closed his eyes, feeling exhaustion pull at him hard. Izuku felt good next to him. Warm and secure. He wished briefly that he could get up and lock the door so they could both rest without worry about some other drunk stupid fucker walking in. He pushed the thought out of his mind, not wanting to acknowledge what that wish meant.
When he felt Izuku grow even more relaxed, he dared a look. No light reflected back - Izuku’s eyes were closed. His breathing deepened and his arm twitched in his sleep across Katsuki’s torso. Katsuki turned his face toward Izuku’s and his eyes drifted shut again. He didn’t care right now. His hand settled over the arm on top of him, almost as if to hold it there or hug it. Slowly, but easily, he finally fell asleep.
--
Izuku woke up with a nasty headache and buried his head in Katsuki’s neck to try to block out the gentle sunlight streaming through the window. He inhaled deeply, enjoying the way Katsuki smelled even through the haze of his headache.
Then Izuku jerked awake in a panic as that thought clicked in his head.
His arms were wrapped completely around the blond young man, his legs entwined with Katsuki’s. It took him a moment to register that Katsuki was holding Izuku to him, practically pulling Izuku on top of him. His head was turned toward Izuku, so close they could kiss. Izuku realized that while he had been nuzzling him, Katsuki’s mouth would have been brushing against his forehead.
The night came flooding back in a rush. The extra drinks slipped to him from each of his friends when Tenya wasn’t looking, the karaoke, the drunken walk to the bathroom. It was hazy and a bit jumbled, but he remembered climbing into bed with Katsuki and insisting this was his room. In the daylight, it was very obviously not his room at all. The dark green comforter alone gave that away, though Izuku didn’t blame himself for not noticing that detail in the dark.
He also remembered the caresses and the whispers, Katsuki’s commendable struggles to get Izuku to behave himself, Katsuki’s moan .
Izuku felt his face grow hot. His blood was rushing through his veins. It seemed Katsuki was still sleeping, his face relaxed and soft, his hold on Izuku possessive and secure. He breathed deeply, clearly at peace.
Izuku relaxed on Katsuki’s chest, moving slowly to try not to wake him. He was going to have to deal with his mood no matter what eventually, so he might as well let Katsuki get as much rest as possible after disturbing him so much last night.
Ever so gently, ever so cautiously, Izuku let his hand settle on Katsuki’s chest, right over his heart. He held his breath and focused closely until he found the steady, powerful beat. It thudded against his palm, heavy and warm.
A chill ran over Izuku’s skin and his own heart frantically thundered in his chest. Katsuki held so much power within him, even his very existence was a force to admire. Izuku couldn’t believe he was this close to him and still alive. He had come to believe over the years that his mere proximity would cause Katsuki to explode in a ball of murderous fire and smoke, yet here Izuku was, unsinged and fighting off an overpowering urge to explore Katsuki’s entire body.
Izuku didn’t notice that he was stroking Katsuki’s collarbone with his thumb until he felt the beat beneath his palm skip and speed up. Katsuki’s breath shallowed. Neither of them moved for a long time, and despite knowing Katsuki was now awake, Izuku didn’t stop stroking his collar, slowly and very deliberately.
When Katsuki still didn’t kill him on the spot and didn’t pull his arm away from where it was wrapped around Izuku’s back, hand resting on his hip, Izuku risked shifting his head just enough to look at Katsuki’s face. His heart leapt when intense red eyes met wide green ones, very much awake and not confused about the situation.
And still neither of them moved nor said anything. Izuku slowly slid his fingers up Katsuki’s collarbone, over the slope where Katsuki’s neck met his shoulder. Katsuki clenched his jaw and kept staring at Izuku, otherwise still as a statue. Izuku let his fingers trail farther up, grazing the side of Katsuki’s neck. When he felt him swallow, he gently brushed his thumb over Katsuki’s Adam’s apple, feeling it move, powerful and masculine. Katsuki’s gaze didn’t break from Izuku’s, even as Izuku’s fingers fluttered up the sharp edge of Katsuki’s jaw, brushed against the smoothness of his cheek, hesitated at the edge of his lip, then traced the bottom one with a slight shake in his hand.
Katsuki still didn’t move, barely reacted except to keep watching Izuku carefully. Izuku’s own expression became a little intense as he shifted up on his elbow so that he was now hovering over Katsuki. He watched for every hint of movement in Katsuki’s face, glancing away only briefly to look down at Katsuki’s body beneath him. When their eyes met again, Izuku glided his fingers down Katsuki’s chest, exploring the hard muscles there, tracing over his sternum and down the edge of his ribs, over his abs, circling his thumb over the dips and rises of muscle.
Katsuki’s breathing became more labored as Izuku touched him, but he kept his expression guarded, his eyes never once leaving Izuku’s. When Izuku’s fingers brushed the waistband of his boxer briefs, Katsuki's breath caught in his chest and he held it, his eyes widening a fraction, waiting to see how much courage the fucker really had.
He relaxed beneath Izuku, exhaling slowly, when Izuku’s hand trailed back up. When his fingers slid over his shoulders and down the length of his arm, Katsuki turned his wrist up, giving Izuku cautious access to the tendons and veins on his inner forearm. Izuku’s fingers traced them all carefully. His lids lowered and Katsuki’s expression mirrored his, a heady desire filling both of their eyes. When Izuku felt the rough, warm palm of Katsuki’s hand, he shoved his fingers in between Katsuki’s and firmly gripped. When he felt Katsuki’s fingers close around his, Izuku closed his eyes and kissed him on the mouth.
The kiss brought Katsuki to life. He gasped into Izuku’s mouth and squeezed his hand, tightening his other his arm around his waist. When Izuku let go of his hand to shove his fingers up into Katsuki’s hair, a groan escaped the blond as he tilted his head back to deepen the kiss.
“What are you doing?” Katsuki growled, sliding both of his hands up Izuku’s back, gripping him hard as Izuku shifted entirely on top of Katsuki.
“Katsuki...” Izuku breathed, breaking away from the kiss to press his lips to Katsuki’s exposed throat. Katsuki moaned and arched up into him. “Oh, god, Katsuki.”
Izuku ground his hips against Katsuki’s, feeling the hardness of their lengths sliding together through the fabric of their boxers. Katsuki spread his legs wider, bucking his hips up and gripping the back of Izuku’s hair to capture his mouth in a deep kiss. He slid his tongue against Izuku’s lips and Izuku parted them willingly, meeting Katsuki eagerly.
They lost themselves in the touches and gropes and moans and gasps, unable to get enough of each other, unable to satisfy their craving for each taste. Every touch was a confession, every kiss was a declaration they had never dared to say aloud.
Katsuki flipped Izuku onto his back and dropped his weight onto him. His mouth roved over Izuku hungrily, biting and licking and sucking on his neck, moving to his chest and shoulders once the tshirt was unceremoniously yanked off and tossed aside. Izuku moaned and moved beneath him, the heat in his stomach tightening when Katsuki finally began panting his name, pressing their mouths back together so Izuku could taste the sound of it.
“Deku, Deku,” Katsuki gasped and moaned between kisses and shifts of his hips. “Holy shit, Izuku. ”
Izuku bit his lip as his hips snapped suddenly and he came hard beneath Katsuki, shuddering and crying out in pleasure. It sent Katsuki over the edge right after him, gripping Izuku’s hip tightly as his body released every ounce of tension in powerful thrusts.
Katsuki dropped his head against Izuku’s shoulder, his body going slack after a few more hard jerks in reaction to Izuku’s mirroring movements. He relaxed his hold on Izuku’s hips. Izuku dropped a hand onto Katsuki’s back, right on the waistband of his boxers. They panted against each other, sweat streaked and loose limbed. When their breathing finally started to come under control, Izuku stroked his fingers up and down Katsuki’s back, earning a shiver from him.
“Fuck was that?” Katsuki asked after another moment, his voice rough and spent. His tone was guarded, insecure, but he didn't move from his spot, letting his limbs grow heavy.
“Really good,” Izuku said, still tracing his fingers over the planes of Katsuki’s back. “Really fucking good.”
Katsuki growled in agreement and approval at Izuku’s curse and closed his eyes, his mind edging toward sleep. He slid his leg up between Izuku's without thinking. He refused to think about anything except how good everything felt right now.
Izuku laughed and rolled into him, causing Katsuki to let out a gruff, gentle noise as Izuku buried his face into his chest.
“What the hell are you doing?”
“This was a really good birthday,” Izuku said, muffled against Katsuki. He felt a soft, barely audible rumble of laughter vibrate through Katsuki and Izuku hugged him tighter, sighing.
“Mmm,” Katsuki hummed quietly, blushing as he settled his arm over Izuku's waist. “...Happy birthday.”