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Katsuki had been fairly young when he realized he liked the feeling of a full bladder. He liked the pressure of it, the desperation that came with that fullness and the humiliation that came with that desperation. So he’d indulged in it. Would go hours on end, holding on until he could barely move before he would go relieve himself. But he hadn’t had the chance - or, if he’s being honest, the courage - to go beyond that. So he would sit and hold it, leave himself squirming and gripping himself through his pants to keep it together until he knew he couldn’t take anymore.
He didn’t quite want to admit that the relief of finally letting go might be so much better if he were still fully dressed.
Moving in with Deku as unofficial partners - Katsuki still had to force himself not to scoff when he heard the term ‘wonder duo’. - made it difficult to find the chance to indulge. He’d be damned if he let himself be in such a vulnerable position when anyone could see him. Especially Deku. Sure, they were something close to friends, now. But just because Katsuki had grown as a person didn’t mean his pride had shrunk at all.
He hadn’t bothered keeping the time, but by the time he got back to the apartment he shared with Deku, it had to have been a few hours since he’d first felt the urge. Deku wasn’t supposed to be home, yet. His shift ended earlier than Katsuki’s, but he liked to go visit his mom. So Katsuki figured he’d be alright. He had some time to lay in his bed, curled up and focusing on the feeling of being so close to that edge.
Panic lit up in Katsuki’s brain when he opened their front door and those stupid, bright red shoes were set nicely to the side. Why was Deku home? He didn’t usually get home until well after dinner when he went to visit his mom, so what the hell was he doing here? That panic caused his muscles to tighten, and he did his best to shove down the interested twitch his cock gave when that panic made his bladder spasm.
“Oh, Kachan! You’re home!” Deku appeared in the doorway from the entryway to the kitchen, smiling that stupidly bright smile of his. Katsuki felt his brow twitch.
“Why are you home?” He demanded, perhaps a bit too harshly. But it had been a long while since he’d gotten off, and even longer since he’d allowed himself to be desperate for a piss. Needless to say, he was frustrated.
Deku’s bright smile faltered, and his head tilting slightly. Katsuki refused to acknowledge it as cute.
“I do live here, Kachan.” He said, raising a brow. Something about the way he talked back, now, caused another little interested jolt to run down Katsuki’s spine and right to his cock.
“Obviously, dipshit.” He snapped, eyes narrowing slightly. “But I thought you were visiting your mom.”
Deku blinked a few times, seemingly needing a moment to process the statement. Then he smiled again and shrugged.
“She went out with some friends from work today.” He said, stepping closer. Katsuki took a step back before he could think about it and he saw the sudden worry flash over Deku’s face.
Fuck. Now that Deku thought something was wrong, he wasn’t going to let Katsuki just run off. Which meant Katsuki couldn’t just escape to the bathroom before he got too embarrassingly desperate in front of him. Most other times, Katsuki would be secretly appreciative of how much Deku cared. Now was not one of those times.
“Kachan? Are you alright?” Deku asked, eyes trailed over Katsuki’s entire body as if looking for a sign of something being wrong.
“I’m fine.” Katsuki said quickly, before Deku’s gaze could lower enough to see how clearly turned on he was. Katsuki didn’t even know why he was so turned on. Sure, he was close to needing to physically hold himself, but the whole thing was ruined now that Deku was here.
The thought made Katsuki’s cock twitch - and his bladder tighten - with a surprising amount of intensity.
Deku’s gaze snapped back up to Katsuki’s face for a moment, then immediately went back to looking him over. Katsuki shifted a bit under the intense stare, and he felt his jaw clench up. Was it worth it to just say he needed to go to the bathroom? Was that embarrassment going to be better than letting himself get needy in front of Deku?
“I just gotta’ take a piss. Going to get out of my way?” He finally said, his mouth making the decision for him.
It fell silent for a long moment. Deku continued to look Katsuki over, and Katsuki was fucking certain he’d noticed the way his hard cock was pressing against his already tight jeans. And Deku was far from an idiot. Not only had he known Katsuki their entire lives, he could put two and two together more quickly than anyone Katsuki had ever met. And that was a dangerous combination.
Deku’s head tilted again, curious, as he looked back up to Katsuki’s face. He took slow steps forward, and Katsuki took steps away from him until his back hit the wall. He knew his ears and the back of his neck were red, and it was just getting worse as he watched vague recognition - and curiosity - light up in those green eyes. Deku kept moving closer, advancing on Katsuki in a way that felt strangely like he was being hunted, and he didn’t want to linger on why that sent another wave of desire through him.
Katsuki’s breath was getting shaky as Deku closed in on him. Warm, calloused fingers reached to carefully - almost lovingly - close around his wrists to move his hands up above his head. Katsuki was surprised to find himself letting Deku do it. With his hands pinned to the wall, Katsuki felt helpless in a way that made his cock swell and he could feel his thighs press together in an attempt to keep himself under control.
“You’re hard.” Deku breathed out, leaning in close to Katsuki’s face. Katsuki turned his head slightly so he wasn’t looking at him.
“Fuck off.” He spat out, glaring at the hallway to his side.
“I knew you liked to hold it.” Deku continued, as if Katsuki hadn’t said anything. “I figured that out a while ago. But you’re getting hard now . That’s different.”
Katsuki’s jaw clenched up, but he couldn’t bring himself to say anything. Of course Deku knew, why did he expect any different? Instead of shame, however, it was desire that shot through him at the words. Enough for his thighs to tighten together again, holding himself that way since his hands were pinned above him.
Deku shifted, holding both Katsuki’s wrists with one hand. And something about that made Katsuki’s breath catch in his throat, made his ass clench around nothing in a way it hadn’t in a long time. With one hand now free, Deku reached to trail his palm down Katsuki’s chest, pausing to thumb at the nipple piercing just barely visible through his shirt, and over his lower stomach. Katsuki inhaled sharply, head falling back against the wall with a dull thud. Pressure. Just the barest hint of pressure, and it almost hurt in the best way possible. That dull ache from holding too long and needing to let go.
“Tell me to stop.” Deku said quietly, so close that Katsuki felt his breath on his face. “Tell me right now to stop and I will. I’ll let you go and I’ll forget this whole thing happened.”
Katsuki crammed his eyes shut, knowing damn well his face was red. He should be saying ‘stop’. He should be telling Deku to let him the fuck go so he could run off before this got any more humiliating. But he couldn’t make himself do it. He bit into his bottom lip, tilting his head back just a little against the wall. He couldn’t tell him to stop, not when the humiliation was making his cock throb. Not when he was being so fully dominated by someone who had always looked up to him.
For a long, long moment, Deku didn’t move. He gave Katsuki plenty of time to stop him, allowed more time than he really needed to just to make sure Katsuki was okay with this. After however long - it felt like hours, considering the pressure on Katsuki’s bladder - Deku took the silence as an answer and leaned in. He pressed his lips gently to the curve of Katsuki’s jaw, and he shifted closer to nudge his thigh between his legs. Forcing them apart. Katsuki gasped, his thighs twitching to try and press together again.
“Fuck…” He breathed out, voice cracking. “Fuck, I need to….” He cut himself off, biting harshly into his bottom lip. Deku nipped at his jaw.
“You can hold it.” He said. “I know you can.”
Katsuki let out a noise that he refused to call a whine, his face burning. He squirmed, not sure if he was trying to push down against Deku’s thigh or pull his hands free. Though, he knew damn well he wouldn’t get his hands free. If Deku wanted to keep him there, they both knew Katsuki wasn’t going to be moving any time soon.
Now that his thighs had been forced apart, they were starting to tremble. The pressure in his bladder had nothing to combat against it and he could feel his lower belly spasming. Deku’s thigh wasn’t pressing up hard enough, and every time Katsuki tried to shift down to try and put a physical barrier, he would move his knee away.
“Hurts.” Katsuki murmured, head lolling to the side to give Deku more room to kiss and bite at the side of his neck. Deku shushed him, gently pressing against his belly with a hand and Katsuki whimpered.
Deku steadily pressed harder against Katsuki’s belly, and Katsuki could feel tears welling up behind his eyelids. He breathed out a curse, feeling himself leak into his boxer briefs. The cloth dampened, and shame hit him harshly. But Deku just kept pushing harder. It wasn’t long before Katsuki was letting out a broken little sob as his control faltered. Katsuki tried to turn his head further away, but Deku’s fingers gripped his chin and forced him to face down.
“You’re going to watch.” He said, voice soft despite how firm the demand was.
Katsuki hesitated before opened his eyes. When he did, those tears slipped down his red cheeks. He watched as that wet patch at the front of his jeans steadily grew. He could feel his bladder spasming as it emptied, and that wet patch moved down his leg until he could see a fucking puddle forming on their wooden floor. Humiliation swelled deep in Katsuki’s stomach, but that only made his cock twitch even as he kept pissing.
He knew Deku was watching, too. Could just barely see that awed expression. And that only made the desire pour into Katsuki’s veins more harshly. When the last of it had dripped out into Katsuki’s soaked jeans, he let out another little sobbing type of sound. Deku released his wrists, seeming ready to catch Katsuki in case he fell.
But Katsuki immediately dropped down to his knees in the puddle he had created, and that really didn’t have the right to be so fucking hot. He reached with shaky hands for the hem of Deku’s jeans, just tearing the button off in his haste to get them open and shove them down. He’d known, in some back part of his mind that wasn’t focused on the fact that he had just pissed himself , that Deku was just as hard as him. But having that cock right in front of his face sent yet another red hot wave of arousal through him and he opened his mouth to take him down to the hilt in one go.
Deku gasped out his name, hands tangling in his hair, and Katsuki allowed himself a moment of pride. If there was one thing he knew he was good at, it was sucking cock. He gripped at Deku’s hips, holding him close as he bobbed his head around him. He pulled back enough to swirl his tongue around the head, pressing at the slit before sinking all the way down again.
“Fuck, Kachan…” Deku groaned, and hearing that stupid nickname in this context made Katsuki moan around him.
Katsuki hollowed his cheeks, bobbing his head faster. Not that it was difficult to do. He loved this. The hot weight of a cock on his tongue, the feeling of fingers tugging at his hair. The fact that he was pleasing his partner as just a bonus.
“I’m close…” Deku told him, pulling harshly at those blonde strands. Katsuki moaned around him, again.
Deku’s hands tightened up in his hair when he came. He cried out, something that may have been Katsuki’s name, and Katsuki felt his cock twitch against his tongue as Deku came down his throat. He lingered there for a long moment, and he licked his lips when he finally pulled off.
As Deku leaned forward to rest his hands on the wall behind him, Katsuki moved closer to straddle his leg. His forehead rested against Deku’s hip as he ground into him, his cock straining painfully in his wet jeans. It was pathetic. It was so fucking degrading, kneeling on the floor in his piss soaked jeans and literally humping Deku’s leg. But he was too far gone to care. Too high on the humiliation, brain too foggy from the arousal. He thrust against Deku’s leg erratically, letting out shaky gasps and broken moans.
“Deku...fuck, deku…” He gasped out, his hands gripping at whatever part of him they could reach.
“Come for me, Kachan.” Deku said quietly, still breathless, and Katsuki let out a harsh cry as his orgasm hit him.
For a long, long moment, the two didn’t move. Both of them gasping for breath, and both of them not quite sure what had just happened. Finally, Deku took a small step back and Katsuki had a brief, terrifying thought that he was about to be left there in his own mess. But, Deku knelt down in front of him and gently cradled his face in his hands.
“Kachan,” He said quietly, waiting for Katsuki to look at him. “Can I kiss you?”
Whatever Katsuki had been expecting to hear, it certainly hadn’t been that. The surprise was clear on his face, but before he knew what he was doing he was giving a small, uneven nod. He saw a small, too genuine smile on Deku’s face before their lips were pressed together. Katsuki didn’t want to admit that it was the best kiss of his life.
“Let’s clean up.” Deku murmured against his lips after a moment. “Next time we’ll have some towels out already, yeah?”
Fuck. Katsuki tried not to gape as Deku helped him up to his feet.
This nerd was going to be the death of him. And he couldn’t fucking wait.