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It was well past one o’clock in the morning as Katsuki made his way down the dorm room stairs, intending to go to the kitchens for some water, when he saw a blue glow from Izuku’s hallway that was a little too telling. He rolled his eyes and detoured toward the nerd’s room, finding the door cracked just enough that the light from his computer screen was leaking out.
Little flickers of color suggested Izuku was watching something and when Katsuki neared, he could see through the crack in the door just enough to make out an old All Might clip, one he was all too familiar with himself. He shifted a little to bring Izuku into view and found the nerd watching the video with rapt attention like the fanboy he was. He wore headphones and sat with his legs on the seat of the chair folded beneath him, with a little All Might plush hugged to his chest.
Katsuki pushed the door open a bit, feeling bold since Izuku couldn’t hear him. He could tell he wasn’t studying the clip for his own improvement. There weren’t any notebooks in front of him to jot down thoughts and strategies. He was just watching the video with pure adoration like a little kid instead of the eighteen year old young man who knew the hero on the screen better than his own father.
Katsuki leaned against the door frame, folding his arms in front of his chest as he watched Izuku watch the video. All Might was making a declaration of some kind and the light from the screen shone in Izuku’s eyes, an unself-conscious smile on his face. Katsuki felt his own expression soften.
It was amazing, honestly, how sweet Izuku was, even after all of these years facing hardships and obstacles no one their age should ever be asked to face. His sweetness was such a glaring contrast to the feral, vicious way he could fight, the way he could narrow his focus on something with such cruel accuracy that Katsuki honestly had feared what he would be able to see with that focus on him. It took those same hard years for him to understand that Izuku saw ugliness and loved someone for it anyway, could see beyond it with such painful kindness that it was actually less frightening what he would see and more frightening to think of how little his kindness was deserved.
Izuku hugged his plush a little closer as All Might finished off a villain with what looked like a Texas Smash. The nerd looked so small like this, more like his middle school self than the tank he was now. Without the heat of a fight tensing and bulging his hard-earned muscles, broadening his shoulders, and bracing his powerful legs as he ready for a kick that could knock teeth out, he almost looked petite.
His curls sprang up in random directions, framing his face delicately, brushing the nape of his neck which sloped down into his t-shirt collar with the fine, hard lines of his spine. His shoulder blades were barely visible beneath his shirt in the murky darkness, limed in the faint light only because of the way he was sitting hunched forward with his shit posture. His waist wasn’t narrow, but it was strong and tapered just enough to lure the eyes lower to the swell of his ass and thighs, which would be sexy if his socked feet weren’t sticking out from under him like a little duck tail.
Katsuki felt his mouth lift in a quiet smile of his own. How many times had he seen this same scene in the past and bullied Izuku for his devoted fanaticism? Had mocked him for it, hated him for it. What an absolute idiot Katsuki had been. A cruel one, too. How could he look at this sweetheart of a nerd and want to hurt him? He was so stupidly cute, Katsuki almost hated it only because he couldn’t just walk in and close his arms around Izuku, squish him with affection instead of disdain. And even knowing he couldn’t do that, he was still too tempted to just stay with the hopes of Izuku noticing him so he would have an excuse to try to keep his attention.
Feeling bold in the late hour, Katsuki stayed where he was leaning against the doorframe to watch as the clip ended and Izuku reached for his mouse to close the video. Instead of shutting down the laptop, though, he pulled up another file saved on his computer and a moment later, a news special of a different familiar fight filled the screen, this one starring Katsuki himself.
Izuku shifted, pulling his legs out from under him to instead hug his knees to his chest, and he rested his cheek on the plush still crushed to his chest, watching the video with so much fondness that it made heat rise up in Katsuki’s face. Izuku’s smile had faded a little, not to sadness, but to a soft affection that was almost too intimate to witness. And yet Katsuki couldn’t look away.
Izuku’s shoulders shook in silent laughter when Katsuki’s past self on the screen screamed something obscene to a villain. Katsuki remembered this special. The news station had to bleep out almost all of his words during this fight. He couldn’t help the grin that tilted his mouth as he watched Izuku laugh a little more heartily as the video showed Katsuki pummeling the villain into the ground.
Cops immediately rushed the scene once the villain was incapacitated and the news reporter hurried after Katsuki as he stalked away, pushing the camera in his face for a few stupid questions that he had to answer as part of his final grade this year. All of the savage delight he had shown during the fight was gone and his expression was pure bored annoyance until something off screen caught his attention and his focus sharpened.
Watching the special after it aired had been so fucking embarrassing for Katsuki at this part. How obvious could he possibly be? Even now, it was so easy to see the pleasure light up his own eyes as the camera panned back to capture Izuku in the frame with him, running toward him to make sure he was okay.
The nerd stopped short just in front of him, not even noticing the camera studying them so invasively, and Katsuki would be lying if he said he didn’t forget about the reporter, too. Izuku did a quick scan of Katsuki’s body, then grinned wildly as he burst into praise over what he saw of the fight. On screen, Katsuki’s expression softened to warm amusement and god, it was so obvious. Even the reporter shifted a little to make sure to capture Katsuki’s dopey expression fully.
Katsuki blinked when Izuku reached forward and paused the video on that moment, with Katsuki’s face the main focus as he looked down at Izuku with obvious affection. His heart thumped loudly in his ears as Izuku shifted his hand up and traced his image’s cheek with his thumb, caressing his face in a way that was unmistakable. And then, just in case Katsuki had any lingering confusion or doubt, Izuku brought his fingertips to his lips to kiss them lightly before brushing them against Katsuki’s smiling lips on the screen.
Katsuki froze, a deer in the headlights of an oncoming freight train as Izuku finally unfolded himself with a quiet groan and pulled his headphones off to hang them on his chair. He stood up, and even though he couldn’t look away from the nerd, it didn’t escape Katsuki’s notice that he had left the video up on his face as if planning to keep it beside him as he fell asleep before the laptop’s screensaver would eventually start.
Izuku stretched his arms above his head, causing his back to pop, and then he turned toward his dresser only to jump back in terror when his eyes landed on Katsuki, the room lighting up brighter up by Izuku’s sudden quirk activation.
“K-Kacchan!” Izuku gasped, the crackles of his power fading over his skin as recognition soothed away the alarmed surprise, but then the teal energy zipped up his body again when pieces clicked into place. With a speed that was only supernatural, Izuku lunged over and snapped the laptop shut, his hands shaking hard as he pulled the device up to his chest to hug it or hide it from view as if Katsuki would forget what he saw if he couldn’t see the laptop anymore. Izuku whirled around to shove the computer under his comforter hastily. “W-what are you doing here? When did you get here?”
Izuku’s voice cracked as he swept down to pick up the plushie he had dropped in shock, and he set it down on top of the comforter where the laptop was hidden, as if to ensure it was really buried. He kept his back turned and focused on his task intensely as if to hide himself from Katsuki, too.
And Katsuki… Katsuki stepped forward, gently reaching out to swing the door shut behind him. Izuku’s shoulders slumped and a quiet “fuck” left his lips. The last of his quirklight faded as he shoved a hand into his hair and turned-
“WAH!!” Izuku immediately shouted in shock again, exploding the room in flashing green for another brief moment as he tripped backward onto his bed, probably crushing his laptop and plush. “WILL YOU STOP THAT?!” he demanded, shoving himself up onto his elbows.
“Stop what?! You knew I was behind you!” Katsuki asked incredulously.
“I thought you left!” Izuku said, accusation heavy in his tone as darkness swallowed them again.
“Obviously not! What the fuck are you doing jumping around like an idiot? Is that what you do when a villain breaks into your room?” Katsuki chided, but he was clearly straining to sound normal instead of nervous.
“No,” Izuku muttered, annoyed and uneasy. “Danger sense would have gone off…”
“Tch.” Katsuki clicked his tongue but said nothing more, and the silence closed around them heavier than the darkness.
“Um…w-when did you-”
“You watch me kick ass every night?” Katsuki asked suddenly, his tone harsher than he wanted it to be. But his heart was racing and he didn’t know what to do. Didn’t know how to act after what he saw. Just knew he wanted to act. Wanted to believe that Izuku’s kiss was really meant for him.
He heard Izuku swallow. The nerd hesitated for a long moment before answering with a shaky exhale. “Yeah…”
“Better videos than that…”
“T-that- That one’s my favorite.”
Katsuki couldn’t see him and was pissed that Izuku had shut the laptop. He wanted to know what his face looked like, if he was hopeful that Katsuki would stay or leave. But at the same time, the darkness made him feel…braver. At an advantage, not against Izuku but against himself. He couldn’t be seen either, after all.
“Why’re you bothering with a video when the real thing is just upstairs?” Katsuki muttered, trying not to sound as vulnerable as he felt. The bed creaked and his heart thundered heavier in his ears.
“Wouldn’t want to annoy you…” Izuku’s voice was so timid, as if they hadn’t spent years screaming at each other, crying in front of each other, saving each other.
“When’s the last time you annoyed me?” Katsuki asked gruffly.
“Ten seconds ago?” Izuku asked wryly, and Katsuki snorted softly in amusement. He heard Izuku laugh a little breathlessly as he continued with caution. “And…”
“And?” Katsuki prompted quietly, shifting forward.
“Um, well, w-would you even want me…to come find the real thing?” Izuku's voice was a fluttery reflection of Katsuki's own guarded tone and Katsuki took another step closer in the dark.
“You really have to ask that?”
“I'd like to be sure I'm welcome…”
“Since when have you ever held back when you weren't welcome?”
“More than you’d probably guess,” Izuku mumbled, then he inhaled sharply when Katsuki's hands brushed against his waist and settled there.
“That right?” Katsuki whispered, barely able to hear himself over his racing pulse.
“K-Kacchan?”
“What would you do if you knew you were welcome?” Katsuki asked nervously, clinging to the image of Izuku kissing his fingers to his picture.
“Am I?” Izuku breathed.
A deceptively simple question with a deceptively simple answer.
“...Yesmmf!” Katsuki stumbled as Izuku rushed him in the dark and yanked him by his collar into a kiss that was surprisingly well-aimed. He gripped Izuku's hips to stay standing and inhaled sharply when the nerd broke the kiss only to tilt his head and dip his tongue into Katsuki’s mouth, sealing their lips back together.
Katsuki moaned loudly and his knees tried to buckle as Izuku licked into him. Then the kiss turned ravenous and Katsuki pulled Izuku against him while turning them and stepping back toward his bed. He fell backward when his legs hit the mattress and took Izuku down on top of him, but the nerd didn't even pause, climbing on top of Katsuki possessively, only freeing his mouth for a hasty pant of air before devouring him again.
One of Katsuki's hands slid up his broad back and dove into soft green curls that made him groan in appreciation. He fisted them gently and Izuku shivered, kissing him harder. Katsuki pressed up into the kiss hungrily, heat growing in his stomach, filling his cock, as he gave himself over completely. His other arm slid lower to squeeze a handful of Izuku's ass and Izuku whimpered helplessly, finally freeing his mouth to frantically kiss down his chin and across his jaw to suck his hot lips against Katsuki's throat.
Katsuki gasped for air, lightheaded and consumed by fire. Part of his bewildered mind tried to understand how a detour to get water ended up like this, but then Izuku was moving down his body, shoving his tanktop up to kiss his chest, leaving scorch marks of desire over his pecs until his lips brushed his nipple and Katsuki thrust up toward him. Izuku took the opportunity to shove his hands under his ass, then he gave a sinuous roll of his hips so that his heavy, hard cock stroked against Katsuki's through their clothes, and Katsuki's eyes rolled back in his head. “Nngh! Ah! I-Izuku!”
Izuku sat up and undulated his hips again, dragging against Katsuki's cock slow and sinful like a goddamn stripper, then he shuddered hard and dropped forward again, bracing his hands on the mattress as he shook his head as if to clear it. Now that Katsuki had adjusted to the murky hall light seeping in under the door, he could see as Izuku looked up at Katsuki through his lashes hotly, one of those fucking expressions he got when his cheerfulness fell away, the kind that always made Katsuki want to pin him against a wall. Then he was sliding further down until he was on his knees between Katsuki's legs.
Katsuki tried to lean up on his elbows but before he could even believe what was happening, Izuku pulled his waistband and boxer briefs down and took Katsuki's entire length into his wet, hot mouth in one desperate movement.
“Fuuuck!” Katsuki cried loudly, coming immediately. He thrust hard into Izuku's mouth, trying and failing to hold back as Izuku choked him down, swallowing what he could. Katsuki’s gasps sounded like whimpers, but he couldn't give a fuck enough to shut himself up. Both of his hands were clenched in his own hair and as his orgasm shook through the last waves and Izuku gently pulled away, gasping, Katsuki dropped his arms and shakily shoved himself up, panting helplessly around his words. “I-Izuku, Izuku, f-fuck, m’sorry, are you okay?”
Katsuki pulled his waistbands back up and leaned forward as Izuku wiped his mouth on his wrist, looking up at him insecurely. Katsuki cupped his face and bent over to kiss him fiercely. Izuku whimpered and wrapped his arms around Katsuki's neck, letting himself get hauled back up on the bed until Katsuki rolled them over and pressed down on Izuku possessively. One of his hands slid down to Izuku's hips, but Izuku clasped his wrist and shook his head.
“I already-”
Katsuki's eyebrows shot up and he pulled back to search Izuku's eyes. He softened when he saw vulnerability there and kissed him tenderly again. When he broke the kiss, he nuzzled Izuku's cheek and jaw with little affectionate kisses.
“Baby,” Katsuki breathed adoringly and Izuku inhaled sharply.
“Y-you're not mad?”
“Mm-mm. Baby, baby, baby,” Katsuki whispered reassuringly. He braced himself on his forearms, boxing Izuku in to look down at him with fondness. “You're a little psycho, aren't you?”
“Kacchan…” Izuku tried to shamefully duck his face, but Katsuki dipped down and caught his mouth before he could. He kissed him with a warm hum until Izuku slowly relaxed beneath him.
Katsuki pulled away slowly and looked down at him, searching his face. “Are you okay? I didn't mean to- I wasn't prepared and-”
“I'm okay,” Izuku said softly. He tentatively lifted his hands to Katsuki's shoulders and Katsuki's settled a little more of his weight on him, knowing he could take it. Izuku's arms slid around his neck. “I…”
When he didn't continue, Katsuki nuzzled him again, kissing his freckles. He shifted his weight to settle beside Izuku, pulling him in to cuddle him.
“Do you want me to leave?” Katsuki asked gently, just to be sure.
“No!” Izuku said as fast as he could, earning a chuckle from Katsuki and another kiss to his cheek. Izuku turned his face and stole the kiss with his lips. Katsuki's fingers found their way into his curls again and he stroked through them soothingly.
“Can I stay?”
“Please stay,” Izuku said weakly, smiling finally. “I'd really like that.”
Katsuki gave him a slanted smile back. “A little better than a computer screen, at least.”
Izuku's eyes shot open wide and he sat up. “Ah! My laptop!!”
He unceremoniously rolled Katsuki out of the way and dug through the blankets to retrieve the device, wincing as he opened the lid and then sighing in relief when he saw it was undamaged and still working normally.
Izuku set the laptop back on his desk, the video paused on the screen again, and Katsuki snorted a laugh, yanking the fanboy back down to kiss his disbelieving, delighted smile meant just for him.