What if Deku asked Kacchan to practice sparing with him? They were the only peers they felt comfortable going all out against and Kacchan always put up a challenge. Katsuki agrees, but with one rule: Loser has to do one thing the winner asks.

[NSFW]

Deku lost their first fight. Something Katsuki expected. It was an easy ask at first, Deku taking over a week of Katsuki's cleaning duty. Their next spar Deku lost again. This time Katsuki had him cook dinner for a week. But that was cut short after two nights of food Katsuki

didn't like.

The next spar Izuku won. Katsuki was already bitter about it, but listened to the request anyway. Spend the night with him.

"Why the hell-"

"When we were kids we used to have sleepovers all the time! I miss them!" Izuku explained. So the blond stayed the night in

Deku's room. He slept on the floor, but it was enough to make Izuku happy.

The next spar Katsuki won again and had Izuku watch a horror movie with him in his dorm. He let Izuku spend the night, but made him sleep on the floor.

Then Izuku won. He asked for cuddles that night. So

it was back to Izuku's room. Two could play at this game.

Izuku won again and asked for the same thing. Just cuddling in bed together for the night.

"How far can we take these winnings?" Katsuki asked as Izuku curled into his arms.

"As far as we're willing to go." Izuku said.

"What if I asked you to give me a blowjob or something? Would you do it?"

Izuku laughed and closed his eyes, "Goodnight, Kacchan."

Hmmm. Katsuki won the next spar.

"I want a kiss." He challenged. Izuku rolled his eyes and strolled over to him.

"Are you sure that's what you

want?" He questioned. Katsuki nodded.

"Okay then." He leaned up onto his tiptoes and planted a small kiss on Kacchan's lips.

"See you tomorrow, same time."

Izuku won next.

"I want to watch you jack off." He said, face straight as he looked at Katsuki.

"Excuse me?"

"I want

to watch you masturbate. Your room." Izuku stated.

Katsuki raised an eyebrow, wondering just how far he'd let their spar bets go.

"Fine, let's go." Katsuki stalked off to his room, expecting Izuku to follow without needing to be told.

Katsuki got onto his bed while Izuku took

the desk chair.

"So how do you want me to do this?" Katsuki asked, shifting nervously.

"Undress and jack off, however you normally do it." Izuku shrugged.

"You really want me to do this?" Katsuki questioned.

"Are you gonna do it or do you want me to tell you to do something

else?" Izuku asked, sounding slightly annoyed.

"I'll do it! Damn." Katsuki scowled and pulled off all his clothes. A blush spread across his cheeks as he spread his legs slightly, hand wrapping around himself.

He stroked his cock slowly, it springing to life with Deku's

observant stare. Shit. This should be more embarrassing than it was. But for some reason he was more turned on than usual and he wasn't even watching porn.

"That's not it." Izuku said, "I know you do more than that."

Katsuki hissed in annoyance.

"Are you saying I finger myself

or something?"

"Don't you?" Izuku asked, sounding too innocent for the question being asked. Katsuki scowled and leaned over, grabbing lube from his drawer.

"Knew it.." Izuku whispered.

"Fuck off. You probably do it too."

"Yeah, sometimes." Izuku shrugged.

Katsuki spread his

legs wider, feeling around for his hole with his slicked up finger. He carefully pushed it in, soon following with a second and a soft moan.

"Wow Kacchan, you can take two so quickly?" Izuku asked.

"I'll fucking kill you if you talk throughout this."

"Sorry."

Katsuki moved

his fingers in and out, other hand back to stroking himself. Duel pleasure, huh?

It didn't take too long to make himself cum, white ropes landing on his lower stomach and thighs.

"There. Now get out of my room." Katsuki growled, grabbing a tissue to clean himself up.

"Good night Kacchan."

Katsuki won the next round.

"Give me a blow job. Right here, right now." Katsuki demanded, standing over Deku proudly, body still sweaty from their spar, breathing heavily.

Izuku dropped to his knees and scooted himself closer, taking Kacchan's waistband

in his hands. He didn't ask before pulling his sweatpants and boxers down, marveling once again at Kacchan's cock.

He opened his mouth, licking up the shaft fully.

"You taste good." Izuku commented. Had to be the nitroglycerin. He opened his mouth more, taking Katsuki into his

lips and closing them around his head. He closed his eyes, slowly taking more of Kacchan in and being pleasantly surprised with his sweet taste. He'd definitely have to ask to give another blowjob when he won again.

(TBC)

Izuku moved down more, taking Kacchan in till he hit the back of his throat. He struggled to not gag, peeking open to see how much more he had to take. Fuck, at least another inch. He could handle it.

"Deku.." Katsuki moaned softly, hands finding their way into Izuku's curly

locks. He scratched gently at Izuku's scalp, helping the boy relax and take the last inch down his throat.

"Fuck that feels good." Katsuki groaned. Izuku let himself adjust before he started to Bob his head, unable to take Kacchan all the way while moving like this, but with the

way Kacchan's body shuttered and twitched, he figured he was enjoying it regardless.

"Gonna cum." Katsuki moaned out. He pulled out from Izuku's mouth just in time, but not quick enough to stop from cumming on the boys face.

"Shit, sorry." He whispered, pulling up his pants

with heavy breaths.

"It's fine." Izuku reached up, wiping cum off his cheek with his hand. Curiously, Izuku brought his hand to his lips, tongue poking out to lap up the thick white rope.

"Don't taste it!" Katsuki hissed.

"Bitter." Izuku whined, face scrunching up.

"Clean yourself up." Katsuki said, throwing a gym towel at him.

Katsuki one their next match.

"Ride me."

It was back to Katsuki's room. Izuku undressed himself and climbed into Kacchan's bed, looking up at him patiently.

(TBC)

"You're really going to?" Katsuki questioned as he got the lube out.

"I already gave you a blowjob." Izuku reminded. Katsuki definitely didn't need the reminder, he'd already jacked off to the memory three times since then and it'd only been two days.

"I need to stretch myself

first though, I uh... Don't have any toys so I've never taken something bigger than my fingers." Izuku warned, reaching to take the lube. Katsuki pulled it away.

"Lay down, I'll do it."

"Are you sure?" Izuku swallowed thickly, slowly laying down and opening up his legs for him.

Katsuki climbed between his legs, pouring lube onto his fingers and spreading it around. He brought his finger down against Izuku's hole, watching it quiver with anticipation.

He pushed it inside, going slow while he watched Izuku's body twitch and tense.

"Relax, you're not

gonna be able to take me if you can't."

"Sorry." Izuku whispered, taking a deep breath to will his body to relax. Katsuki used his free arm to lift Izuku up, wrapping his legs around his neck. Turning his head to the side, he kissed at Izuku's inner thigh, pushing his finger in

deeper as he did so.

"K-Kacchan!" Izuku flushed deep, turning his own face away.

"You took it pretty easily, besides freaking out a little." Katsuki praised. Sort of.

He moved his finger in and out of him, hearing the squelches it made due to the lube. He soon pushed in his

second finger, not warning Deku in case it would make him panic again.

"Ah, so good~" Izuku whined, "I can take more."

Katsuki pushed his fingers apart, stretching out Izuku's hole so his third could go in. He fucked Izuku's hole with his fingers roughly, making Izuku mewl and

squirm.

"I think I'm ready, I want to ride you now." Izuku panted, loosening his legs from around Kacchan.

Katsuki pulled out and lowered Izuku's legs, then took his own clothes off.

"You're already so hard.." Izuku commented. Katsuki shrugged and sat at the edge of his bed,

opening his arms. Izuku crawled into his lap, taking Kacchan's cock in his hand to guide it into his needy hole.

He slowly lowered himself down, groaning at the feel. He put his arms around Kacchan's shoulders, face burying into the crook of his neck as he prepared himself to go

down more.

"Fuck fuck.." Izuku whined as he sunk down another inch.

"You feel good, keep going." Katsuki encouraged, putting his hands loosely on Izuku's hips.

"Y-yeah.." Izuku sighed out. He let out a breath, moving his hips down even more.

"Shit, almost there, Deku."

The boy rocked his hips, trying to get used to the length he already had. Then he went down more, feeling Kacchan's thighs against his ass.

"Ha... You're so thick." Izuku moaned against his neck.

(TBC)

Katsuki smirked in pride.

"How are you feeling?" He asked, rubbing at Izuku's hips. He felt good, he wanted him to ride already.

"I'm okay, just.. give me a second." Izuku chuckled. He shifted his hips, wiggling to get used to Kacchan's thickness.

"Okay.." he slowly lifted his

hips, then brought them back down with a soft hiss. He tried again, this time it felt a little better.

"Shit Deku, you're so tight." Katsuki groaned gently, pulling Izuku closer. Izuku moved his hips more, finding a slow but steady pace he could work with. Holding Kacchan's

shoulders for support helped a lot.

After a few more slow bobs up and down on Kacchan's dick, Izuku picked up the pace, soon finding himself chasing his own orgasm as he bounced up and down on him. Kacchan seemed to be enjoying it too, head thrown back, moans pouring from his lips.

"Gonna cum, Deku." Katsuki

warned.

"In me." Izuku begged, not stopping his movements.

"Fuck!" Katsuki groaned, his own hips bucking up as he came inside the other boy.

Izuku moaned at the feeling, cumming over Katsuki's stomach.

After catching their breaths, they cleaned themselves up. Izuku tried to leave but Katsuki pulled him into bed instead.

Izuku won the next practice spar.

"I want to top you." He stated.

"Excuse me?"

"I rode you last time, it's only fair you bottom this time." Izuku pointed

out.

"Fine. But if you tell anyone about this I swear to god I'll kill you." Katsuki agreed, "And we're doing it in my room."

"Deal!" Izuku grinned and followed Katsuki down the hall.

"Wow you guys have been working hard!" Kirishima commented as he passed them, "Even after

your spars I hear you working out in your rooms."

"Maybe you should keep up, we're gonna pass you in class." Katsuki commented, pushing himself aside to get to the elevators.

"At least he just thinks it's extra training.." Izuku mumbled once the elevator doors had shut. Kacchan

grunted in response.

"Don't tell me you're nervous now. Who cares if Kirishima knows? You guys are friends." Izuku reminded.

"I'm not getting nervous! If you wanna top me then just fucking do it." Katsuki growled. The doors opened and the two went inside his room.

"Do you want

me to stretch you?" Izuku asked as he got the lube from the draw he'd seen Kacchan pulling it out of.

"No, I'll be fine." The blond said, stripping down.

Izuku pulled his own clothes off and lubed himself up. He got between Kacchan's legs and guided his cock to his hole. He carefully pushed in, surprised how well Kacchan could take him.

"Did you prepare for this?" Izuku asked, looking up. Katsuki flushed at the question.

"Of course not!" Katsuki growled, though it was clear he was lying.

"You wanted me to top you!" Izuku accused with a grin, "I'll make sure to fuck you good then."

Izuku pushed himself in all the way, Kacchan's groan like a sweet song to his ears. He moved roughly, knowing

Kacchan could take it. Thrusting in and out of the other boy harshly.

"Oh fuck, fuck!" Katsuki groaned, grabbing onto the sheets below him as he was fucked into.

"So good, so good Deku-!"

Katsuki was much louder than Izuku thought he'd be, moaning and groaning, giving praise

and twitching with every thrust.

Katsuki came first, thick white ropes painting his stomach and lower chest. When Izuku came he pulled out, mixing their cum over Katsuki's pale skin. He looked incredibly arousing covered in their combined cum.

From then on the winner of their

practice matches picked their positions for the night. Who topped, what position they'd try, any new kinks or toys they wanted to add in that night. Winner was always in control and they got used to fucking after every fight.

[END]

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