Warning, mature content ahead! (Smut)

Pain and Pleasure

Katsuki found out about their plan for Denki to postpone his fight for him to heal, and had blown up a bit about it. Eijirou calmed him, and explained their reasons, but the blond was still pissed.

They settled on an agreement; everyone would fight until they reached the two hundredth floor; and proceed with their fights against Deku while Katsuki healed. They seemed reluctant, but Kacchan was only supposed to fight Deku last, so it didn't really matter all that much.

Two weeks later, and they found themselves in the stands, surrounded by roaring crowds as they cheered for the fight to come. Tenya versus Izuku. Katsuki was sat in between his mates, Bisky, Wing and Zushi beside them.

Katsuki tried scanning the crowds, and had to wonder if that clown--Hisoka--was even there at all. He probably didn't even know who Deku was, much less the desire the young alpha had to fight him.

The announcers kept talking and introducing the two new fighters as Katsuki watched the two stretch and ready themselves. Deku would have to be careful in this fight, with Tenya's speed, he could easily and sufficiently invade Izuku's space and land the first blow.

Tenya was fast, but muscular too, and his hits hurt. Deku was also not allowed to use more than thirty percent of One For All, lest they want the shockwaves of his punches alone to tear the whole building apart.

Actually, thirty percent might be too much. Katsuki clicked his tongue, annoyed. The announcement of the start of the fight had Tenya sprinting across the arena, closing in on Deku in mere seconds.

Izuku stared wide eyed for a second, bringing his arms up to block a swift kick, gritting his teeth. Tenya pulled back, moving to punch Deku instead, which was also blocked. It was a tense few seconds, the crowd having mostly gone quiet as the two exchanged blows; blocking and dodging.

The two broke apart, standing a few feet away from each other, just taking a moment to breathe and think through their next attacks. This time, Deku lunged forward, using ten percent of his quirk; just enough to match Tenya in speed.

In full honesty, there were few people who could match Deku when he used a hundred percent of One For All. Some pro heroes couldn't even come close; so powerful Deku's quirk is.

Katsuki had to wonder, if the two ever fought seriously with their full strength; could he actually beat Izuku? It wasn't even as if he could be assured by the fact that he could outsmart him, Izuku was smart and analytical.

Katsuki himself had improved immensely as well; he was no push over. He bit back a grin; he couldn't wait for his and Deku's fight.

They were even, their scores were both six at this point. Deku would have to step it up, lest he want Tenya to actually come out victorious. The two continued to exchange blows, until Deku grabbed Tenya's right arm, and turned around; back to chest.

Deku pulled, throwing Tenya over his shoulder and onto the concrete bellow, knocking the larger beta's breath from his lungs; Tenya barely managed to roll out of the way of Deku's punch. The concrete cracked under the force.

Izuku powered up One For All to twenty percent, sped up until he was behind Tenya, who turned to try and block, but took a powerful punch to the gut that sent him flying into a wall, slumping to the ground.

Izuku won by knockout, but he was quick to run and check up on his friend, laughing bashfully as the crowd roared. Katsuki watched as Tenya regained consciousness after a small while, rubbing the back of his head.

The two left the arena and Katsuki stood to follow.

"Are you okay?" Ochaco asked once they made it back to Katsuki's room.

"Yes," Tenya answered with a nod.

Katsuki moved into the kitchen, grabbed a washcloth and filled it with ice.

"Good fight you two," Bisky complemented as she say on one of the sofas.

Zushi nodded enthusiastically. "Yes! It had me sitting on the edge of my seat!"

Katsuki grabbed Tenya's arm, making him sit on the bed; he pressed the washcloth with ice against the back of his head.

"He was literally sitting on the edge of his seat, like no joke!" Denki laughed.

Katsuki moved to sit beside Tenya, keeping the makeshift ice pack pressed to the back of the beta's head, watching as everyone talked.

Deku was apologizing profusely to Tenya for hurting him, the beta trying to assure him that it was fine.

"I think Tenya would be more insulted if you had gone easy on him, Izuku," Shoto interjected.

Tenya nodded as Izuku bit his lip, still seeming worried and apologetic.

"Yes, I knew what I was getting into. Besides, I feel honoured to have fought you," Tenya spoke with a reassuring smile.

Izuku smiled. "Yeah!" He said in relief.

"Are we even sure that Hisoka is in the fucking building? We better not be going through all this shit just for that fucking clown to not be here," Katsuki stated.

Bisky hummed. "That's true, we don't know if he's here. It could be possible he is, the only other thing keeping him busy these days is his desire to kill the remainder of the Phantom Troup,"

"If I'm not mistaken, he has a fight scheduled in three weeks. If he shows up, I'll be sure to try and talk to him, let him know that Izuku is here and wants to fight him," Zushi mentioned.

"Will he even know who Deku is, though?" Denki asked.

Zushi nodded. "If not, I'll just tell him he's Gon and Killua's son. I am certain he will though,"

"Why's that?" Hitoshi asked as he stretched lazily.

"Hisoka has always had a...keen interest in Gon, so I'm sure when you mention Izuku is his son, he'll wait eagerly to fight. That and he was promised a fight with you when you were born, so, there's that, too," Bisky answered.

Katsuki narrowed his eyes. "Why say it that way? Why'd you hesitate? Something we don't know about the guy?" He questioned.

Bisky tried acting oblivious, but caved fairly quickly. "He's a total pervert, and gets turned on in a fight," she admitted.

It went quiet after that, until Katsuki sighed loudly, feeling incredibly old.

"Great. Just what we fucking need. A perverse, overpowered clown that gets turned on when he fights. Just fucking great. Can't get any worse, can it?" He grumbled to himself as Bisky laughed nervously.

--

A week later, they scheduled another fight. Katsuki and Shoto sat watching as their two mates fought one another, Shoto chewing nervously on his lower lip. Katsuki gripped one of his hands tightly, unsure why both of them felt so nervous.

Eijirou had used his Unbreakable form right from the start, knowing he couldn't withstand a prolonged fight. His mates had helped him train Unbreakable until he could keep it for a solid fifteen minutes--twenty, depending on the strength behind the attacks he was taking.

Every time Izuku landed a hit, he could feel his knuckles, or legs-- whatever he was using to attack--sting and ache. Eijirou landed quite a few hits, knowing that Izuku would be bruised and cut quite badly after their fight.

He knew it wouldn't be manly if he didn't go all out against his mate, but it was also not manly at all to hurt one of his lovers. Izuku had to use twenty five percent of One For All to actually hurt Eijirou's Unbreakable form.

The fight lasted much longer than Tenya's had, but ended up with Izuku winning by points. The crowd cheered and went wild once the fight ended, and Izuku chuckled a little as his fingers twitched and ached.

Once they got back to the room, Shoto tended to Izuku's wounds.

"Man, I'm so sorry I hurt you," Eijirou apologised; sheepish.

Izuku smiled as Shoto bandaged his hands. "It's fine, I like pushing myself and seeing how I'd do against different opponents,"

"Are you hurt at all, Ei?" Shoto asked as he finished bandaging Izuku.

Eijirou blinked, looking down at himself and his slightly torn clothes. "I don't think so?" He replied.

Shoto stood straight, bending forward to place a loving kiss to Izuku's forehead before moving towards Eijirou; he grabbed the hem of his shirt, tugging.

Eijirou raised his arms on instinct and allowed Shoto to pull his shirt off. Katsuki moved to sit beside Izuku on the bed, grimacing at the discomfort he still felt; he leant his head on the shorter alpha's shoulder.

Shoto inspected Eijirou's body, clicking his tongue at the scrapes and bruises that littered his torso. They spent the next few minutes in silence as Shoto cleaned the cuts on the beta's skin.

Katsuki had kicked out the rest of their friends, wanting his room just for him and his mates. There had been whining and complaining, but they left eventually, understanding that their alpha needed to rest with his mates.

Katsuki was sure that Denki and Hitoshi were in the omega's room, hopefully not going too crazy with whatever shenanigans those two got up to whenever they were alone. Katsuki briefly entertained the idea that they were possibly fucking, but even that was less stupid than some of the things they got up to in the past. Denki's a bad influence.

Izuku barely suppressed a yawn as he moved his left arm to wrap around Katsuki's waist, pulling the blond closer to himself; he nuzzled his nose into the blond's soft hair, inhaling deeply.

"You should rest," Shoto stated as he ran his fingers through Izuku's hair, and caressed Katsuki's cheek with his free hand.

Still shirtless, Eijirou moved to hug the omega from behind, resting his chin on Shoto's shoulder.

"All three of you," Shoto added as Eijirou gently squeezed him.

"You're probably right," Eijirou mumbled as he started to press kisses against Shoto's neck.

"I can think of other things more appealing than sleep," Katsuki stated with a sly smirk.

Shoto sighed, as if he were a hundred years old and being subjected to the whims of a five year old. Izuku chuckled into Katsuki's hair, moving to wrap both arms around the blond.

Izuku pulled his head back slightly as Katsuki moved to raise his head, faces a few inches apart. Izuku smiled softly as he inched forward to press their lips together. Shoto closed his eyes as his two alphas started to kiss.

Eijirou hummed, tugging on Shoto to turn around. The omega turned his head, lips connecting with Eijirou's; the two started kissing slowly, steadily growing in heat and passion.

Izuku moved to slowly push Kacchan down on the bed, careful and gentle so as not to hurt the blond. Katsuki sighed as he relaxed into the soft bed, a soft groan forcing it's way up his throat as Izuku grabbed his hip; dragging his hand up over the blond's hipbone, and under his shirt.

Katsuki light grey shirt rode up his abdomen as Izuku's hand glided up his sides and towards his chest; fingers gently starting to play with the other alpha's left nipple.

Shoto moved to turn in Eijirou's grasp, lips still connected as the beta start to move them towards the bed, but stilled just before reaching it. Shoto gasped and panted against the beta's lips as both his ass cheeks were grabbed and squeezed, forcing their bodies closer together; hips grinding sensually.

Eijirou groaned, pushing his body against Shoto's to force them towards the bed again. They collapsed onto the bed, just barely missing falling on top of Deku. Eijirou moved to kiss Shoto's neck, allowing the dual haired omega to catch his breath.

The beta moved so that he wouldn't straddle Shoto anymore, spreading the omega's legs and settling between them. Shoto licked his lips, wrapping his legs around Eijirou; hands smoothing down the other's muscular back until they reached the start of his pants.

Shoto hummed as he moved his hands to the front of Eijirou's jeans, popping the button and pulling down the zipper, knuckles brushing against the beta's half hard cock. Eijirou's breath hitched, lips pausing briefly over the dark red mark he'd been making on Shoto collarbone.

Eijirou kissed the mark, nipped at it gently and licked before he pullback to sit on his legs, licking his lips at the sight before him. Shoto's cheeks were blushed a light red, lips swollen and moist, hair dishevelled.

The moved to grab the bottom of Shoto's shirt, pulling the fabric up and over his head; tossing it to the side. Eijirou licked his lips once more at the creamy skin before him, and bent forward to capture Shoto's lips once more in a brief, heated kiss.

Katsuki raised his arms, allowing Izuku to pull off his shirt, briefly sitting up a bit to make the action easier. His bandages scratched against his skin, irritating him, but he tried to ignore it and focus instead on kissing Izuku's neck and collarbone.

Deku moved to straddle his lap, panting softly as Katsuki sucked a mark on his neck. Izuku moved back, ignoring the annoyed grunt from Katsuki and impatient hands grabbing his hips; scarred hands gripping his own shirt to tug it off.

Katsuki's hands smoothed over the skin on his side, pulling him closer to kiss his chest and stomach. Izuku tangled his fingers in blond hair, breath leaving his lungs in a sigh as he enjoyed the attention. Katsuki forced a moan from his lover as he started licking and biting on one nipple.

Izuku tugged harshly on the blond's hair, forcing his head back; their lips reconnected in a harsh kiss, fighting for dominance. Izuku used his right hand to press on Katsuki's shoulder and guide him into laying back down.

Deku moved to better straddle Katsuki's hips; grinding down on him, breaking the kiss to groan at the pleasure shooting through them. Katsuki grabbed his hips, guiding him into doing it again; hips grinding together repeatedly as they started kissing again.

The two broke apart at the sound of Shoto moaning, head tossed back, biting his lower lip as Eijirou fucked him with his fingers. The beta has his face buried in his neck, kissing, sucking and licking at any patch of skin he could reach, his right hand down Shoto's pants, two fingers thrusting in and out of the omega's tight hole.

His left arm pressed into the bed to better support himself, Shoto whined as Eijirou pulled his hand out of his pants. Lips reconnecting; Eijirou blindly moved to pull off the remainder of their clothes; cock throbbing painfully.

Izuku moved to kiss Katsuki again, hands fumbling with his belt buckle before undoing it and popping the button on his jeans. Once the zipper was pulled down, Izuku reached and grabbed Katsuki's cock, the blond breaking the kiss to moan loudly.

Katsuki pushed Izuku back to sit up, undoing his button and zipper; stroking him quickly once he had a hold of the other alpha's cock. Eijirou pulled back, allowing Shoto a moment to roll onto his stomach.

The beta grabbed his hips, physically pulling him onto his knees. Shoto panted, eyes locking onto his alphas as they rubbed their cocks together. Dual eyes rolled back as Eijirou pushed into him, slick making entry all the more easier.

The beta and omega moaned in near unison, gaining their alphas attention. Pulling apart, Katsuki moved behind Eijirou, pulling the beta into a heated kiss, grabbing his hips and guiding him out of Shoto until only the head of his cock remained sheathed; pushing him forward to thrust back in.

Katsuki moved his right hand to Shoto's hole, gather slick on his fingers. Shoto moaned into the kiss he shared with Izuku, grabbing the alpha's cock, he started to stroke him. Izuku pulled back to breathe, burying his hand in Shoto's hair as the omega lowered himself to start licking at the alpha's cock.

Izuku groaned as Shoto took him into his mouth, bopping his head up and hallowing his cheeks. Katsuki nipped at Eijirou's neck, listening to the beta groan, hips thrusting backwards and forwards distractedly.

Katsuki fucked three of his fingers into Eijirou, his left hand knuckles deep in Shoto's hole, preparing the omega for double penetration. Eijirou reached with his right hand to gently grip the blond's cock, stroking clumsily as he threw his head back onto Katsuki's shoulder.

"Fuck," Katsuki grunted into Eijirou's neck, pulling both of his hands back, rumbling in his chest as Shoto whined.

"Katsuki," Eijirou moaned, turning his head to kiss him.

Shoto pulled back from Izuku with a soft pop as the alpha moved to climb underneath him, pulling the omega into a kiss as Katsuki grabbed his aching cock, lining him up with Shoto's hole. Izuku slowly pushed in, kissing Shoto's neck as the omega tilted his head back with a moan.

Eijirou groaned at the friction of Izuku's cock rubbing against his. Katsuki nipped at his earlobe as he started pushing into the beta, groaning lowly at the tight heat.

They all stilled, panting and moaning as they tried to catch their breath. Katsuki leaned into Eijirou, hands gripping Shoto's hips; and thrust forward into Eijirou, causing the beta to rock into Shoto.

The beta and omega both moaned loudly as Katsuki did it again, slowly starting a clumsy rhythm as Izuku struggled a bit to time his thrusts. Eijirou placed his hands on top of Katsuki's on Shoto's hips, fingers intertwining loosely as he turned his head to kiss the alpha sloppily.

The two alphas sped up their thrusts, muscles burning at the movement.

"F-ah-uck," Shoto moaned as his prostate was hit, biting his lip.

Izuku aimed to thrust there again, watching as Shoto arched his back, head tilted back as his lips parted.

"Ah! Again, Izuku, right there-YES!"

Izuku continued his assault on the omega's prostate, pulling Shoto down for a sloppy kiss, panting and moaning into each other's mouths.

Katsuki grunted in irritation as he pulled back and out of the beta, ignoring Eijirou's whine.

Katsuki grabbed his hips, forcefully pulling Eijirou out and away from Shoto, tossing him on the bed next to Izuku. Katsuki clicked his tongue at the disappointed whine he got from Shoto.

The blond alpha moved grab the back of Eijirou knees and pull him closer, ignoring the ache in his ribs as he thrust back into the body below him.

Izuku paused his movements to adjust a bit better as Katsuki reached to grip a handful of white and red hair.

Shoto pulled away from Izuku as Katsuki tugged on his hair, pulling the omega towards him so they could share a kiss. Shoto sat down on Izuku's cock, moaning into the blond alpha's mouth.

Izuku pulled Eijirou into a kiss, swallowing the beta's moans and groans as Katsuki continued to thrust into him. The blond pulled back from Shoto and leant forward, thrusting at a new angle; he hit Eijirou's prostate.

Katsuki stole Izuku's lips as Eijirou pulled away.

"Yes! Katsuki, right-right there, don't stop!" He moaned, bucking his hips to meet Katsuki's thrusts.

Izuku broke the kiss to moan and watch as Shoto started to ride him, head tilted back in pleasure as the alpha bucked up into him. Katsuki kissed Eijirou's neck as the beta moaned into his ear, right hand pumping his cock in time with his thrusts; he could tell the beta was close.

Katsuki moved lay on top of Eijirou, stilling his movements to tease the beta; the ache in his ribs growing stronger and harder to ignore.

"Don't stop, Katsuki, please," Eijirou begged.

The blond started moving his hips again, slowly, mercilessly teasing the beta. Eijirou's hand grabbed and squeezed Katsuki's ass cheeks, guiding his hips forward. The beta bit his lower lip, he could feel the way Katsuki's abdominal muscles worked; pressed as close to him as he was.

Izuku was thoroughly enjoying the sight above him, eyes following a drop of sweat as it slid down Shoto's neck. The omega was bouncing on his lap, hands gripping his thighs for support.

"Ah-I, I'm close," Shoto moaned, biting his lower lips as Izuku groaned.

Reaching up to grip pale hips, Izuku started to thrust in earnest, desperately chasing after their orgasms.

Izuku felt Shoto's walls tighten around him as the omega moaned loudly, thighs shaking with the force of his orgasm. Izuku thrust a few more times before he followed, knot popping, but not swollen enough to keep them connected; that was saved for heats.

Izuku breathed heavily as he came down from his high, allowing himself a moment to rest before he noticed both Katsuki and Eijirou watching them. Izuku could see neither of them had came yet, and noticed the subtle tremble in Katsuki's body.

Shoto blinked at them, biting his lips as he climbed off of Izuku's lap. Izuku sat up, moving in behind Katsuki despite his body begging for sleep. Katsuki moved to sit up; back pressed against Izuku's chest.

"C'mon, Kacchan," Izuku whispered into his ear, grabbing his hips and guiding him backwards and forwards slowly. Shoto sat down on Eijirou's lap, effortlessly sheathing the beta's cock into him; gently rocking his hips.

Izuku could tell then that Kacchan was hurting, the way he was leaning heavily against Izuku, hands trembling on Eijirou's thighs. It made Izuku wonder just how hurt the blond was. Katsuki had suffered through cracked ribs before, but it was nothing like this.

He must have broken them, then. Izuku knew Katsuki would never admit to not being able to finish something, especially not during sex, so instead he guided the blond's hips, and took most of his weight.

He quite enjoyed being relied on so much by Kacchan. It took a few more thrusts for Eijirou to finish, followed soon by Katsuki. The group collapsed into bed, snuggling closer and eventually falling asleep, oblivious to the knocks on the door.