Chapter Text
Months of being locked in a cock cage wasn't anything new for Kiyoomi. Atsumu had the keys to his orgasms ever since they had started dating two years ago. They had started off with long term denial, but after Kiyoomi accidentally came while humping the bed as Atsumu fucked him, they had switched to the cage.
However, months of being locked in this cock cage felt different. Kiyoomi brushed it off, thinking it could be because it was his first time in a flat cage. After all, it was weird not having a bulge anymore. Men's pants and underwear fit his crotch more loosely.
He was sure that would change. After months of denial, his balls had always steadily grown bigger, filling up with cum.
But that didn't happen.
He wasn't even the one to notice. After a few months in the cage, Atsumu wanted to bust his balls. Kiyoomi was lying on the bed, spreader bar on his legs, wrists tied to the headboard, ready for the hell that Atsumu was going to put him through.
Atsumu was sitting in front of him, gripping his balls painfully. The torture hadn't even started yet. He gave a harsh squeeze, and Kiyoomi winced.
“Have you been coming behind my back, Omi? These feel smaller than usual.”
Kiyoomi shook his head vehemently. The one time he had come from his cock while caged up, it had been Atsumu's fault. He was teasing Kiyoomi, holding a vibrator to his cage and making fun of him for not being able to come.
Kiyoomi had surprised both of them when he did.
And even though Atsumu was responsible, Kiyoomi had still come without permission, so Kiyoomi was the one who was severely punished. Atsumu had paddled him so hard he couldn't sit for weeks. He also bruised his balls black and blue, and took special care to hurt them when they were out that week.
He must have told the team that he was playing a prank on Kiyoomi, and that they should help him out. Multiple stray volleyballs were aimed directly at Kiyoomi's crotch during practice every day, the team wincing in fake sympathy as he fell over and whoever had hit him pretended to be sorry.
“Sorry, Omi-san!” Hinata had shouted in his direction after hitting his dick and balls with a serve going over fifty miles an hour. “Won't happen again!”
It did. Moments after Kiyoomi had been able to stand again, Hinata magically made the same mistake.
Once when he wasn't paying attention, Atsumu snuck behind Kiyoomi and kicked him as hard as he could between his legs. Kiyoomi had been forced onto his tiptoes from the strength of his kick, his bruised balls squished between his body and Atsumu’s foot. Everyone else seemed to have been told in advance; they were all looking at him when it happened and howled in laughter alongside Atsumu as Kiyoomi clutched his balls and crumpled to the ground, whimpering.
He had to sit out the rest of practice, an ice pack on his crotch. Foster had reprimanded Atsumu, but that didn’t stopped Atsumu from holding Kiyoomi's balls and squeezing them in his tight fist every five minutes under the table during team dinner that night.
After that week, the team stopped. For the most part. He was still getting nailed in the balls at least once a week, something that no one else seemed to be the victim of, but it was better than multiple times every day.
Needless to say, Kiyoomi never tried to come with his cage on. He knew the consequences weren’t worth it.
Atsumu glanced at Kiyoomi shaking his head and continued playing with his balls.
“You know, I think I wanna edge you today, actually.” He let go of Kiyoomi to unclasp his necklace and slide the key off. Kiyoomi's heart pounded. He had learned to never expect to be let out of his cage about a year ago. Atsumu had let him out three times in twelve months (and had allowed him to come just one of those times), so he never got his hopes up anymore.
Atsumu smiled as he unlocked his cage and took it off. He looked down, grabbing Kiyoomi's cock and rubbing it.
Kiyoomi felt like he was going to explode within a minute. He was so sensitive. He whimpered when Atsumu paused.
“Omi, are you even enjoying this? You're not getting hard.”
Kiyoomi looked at Atsumu in confusion. Of course he was enjoying this, what did Atsumu mean when he said he wasn't hard?
He looked down at his crotch.
He wasn't only soft.
His dick had shrunk.
He sat up as much as he could to get a better look at himself. He'd never had a monster cock, but his dick was proportional to his body. Back when he masturbated, he could wrap his hand around it and see the tip peak through his fist when soft.
His dick was maybe half an inch long now. His heart pounded.
“Wh-what happened to my dick?”
Atsumu touched it again, and Kiyoomi threw his head back. It felt so sensitive.
“I dunno. I knew it was gonna be small as it uncompressed from the cage at first, but I thought it would be normal now.” Atsumu took his hands away and pulled out his phone, looking something up.
“I did my research. This shouldn't have happened just because you were caged up.”
Atsumu seemed to have found what he was looking for. He read something, then looked at Kiyoomi, eyes glinting.
“Alright. So. Bought this cage a while ago, didn't read the fine print. I don't exactly understand it, but it seems like this company works in body mods, and locking your dick in the cage for as long as we did has permanently shrunk it. And um, made it useless, so you can't get hard.” Atsumu was grinning as he glanced at his phone again. “Damn, your balls don't make cum anymore, either. So. Sorry for not reading the fine print and warning you, but also, I'm not that sorry because it's really fucking hot.”
Kiyoomi's head was swimming. He was going to have a micro dick that couldn't get hard for the rest of his life. He wasn't ever going to come like he had before, because his balls couldn't even make cum.
Atsumu had accidentally changed his dick forever, and he wasn’t even sorry.
Atsumu held Kiyoomi's tiny cock up and rubbed at the tip of it with two of his fingers. Kiyoomi squeaked.
He hated to say it, but it felt incredible. It seemed like all of the nerves in his dick were still there, concentrated in the much smaller area.
Atsumu kept rubbing his dick, Kiyoomi unable to hide away as he was still tied up.
“It honestly makes sense for you to have a microdick, Omi. After all, it's totally worthless. You don't need to get hard, you don't need to fuck anything.” Atsumu licked his hand and started rubbing his whole palm harshly against Kiyoomi's cocklet. It fucking hurt.
“And it makes even more sense that your balls don't make cum anymore. Only thing they're good for is for being my little stress toys, something to hit and squeeze after I've had a tough day.” Atsumu did just that, and Kiyoomi shuddered. He wasn't sure if they felt worse than normal. Atsumu hadn't even hit him that hard, had barely squeezed, but his insides had curled, his legs wanted to draw up and protect himself. He'd have to read the fine print for the cage later, see exactly what it said had happened to his body.
Atsumu continued talking. “I'd say you not making cum would mean an easier clean up, but you’re so fucking wet, Omi. You're like a girl.”
Kiyoomi panted. He was going to come. Atsumu was rubbing his dick like a clit and he was going to come.
With another harsh rub, Kiyoomi's back arched, his dick squirting out clear liquid. His eyes crossed. He hadn't come from his dick in so damn long, and it felt incredible. Atsumu kept touching him, his little cock twitching in his hands with every burst of pleasure.
His orgasm started winding down, but Atsumu didn't slow his pace.
“Ah, Atsumu, I came!”
Atsumu hummed.
“I bet you can have multiple orgasms like a girl, too, Omi. After all, you don't need to get hard. No refractory period.” He kept rubbing, and it hurt even more than it had. His cock was sensitive, and Atsumu's calloused hand was starting to feel like sandpaper against it. “Besides, how can I be sure that you really came? It's gonna be hard to tell since you don't have cum. What if you're faking it to make me feel better?”
Atsumu grinned as Kiyoomi struggled against his bonds. He knew damn well when Kiyoomi came. He knew when Kiyoomi came from his ass, despite no cum leaking from his dick. Kiyoomi was obvious with his orgasms.
It hurt, and Kiyoomi knew that if he came again, the overstimulation would only get worse, but he was already close. It had been so long since Atsumu had touched his cock. He closed his eyes and panted, trying to hold it off, but Atsumu took advantage of his closed eyes and surprised him by slipping a finger inside of his ass.
Kiyoomi yelped in surprise and pleasure, clenching on the finger as he orgasmed, even harder than before. Intense waves of pleasure were interspersed with pain, but he couldn't do anything to stop it.
Atsumu continued like he had before, completely ignoring Kiyoomi's pleas for him to stop.
Kiyoomi looked at his cock as Atsumu rubbed it. The tip was bright red, obviously irritated.
Atsumu slid another finger inside Kiyoomi, reaching for that spot that made Kiyoomi go dumb.
He found it within seconds, and Kiyoomi's legs shook. It didn't even take a minute for Kiyoomi to come again.
He had never come in such rapid succession before. Atsumu was going to kill him.
Atsumu continued stretching Kiyoomi out, pulling two more orgasms from him, each one worse than the last.
Atsumu finally pulled his hands away, and Kiyoomi breathed a sigh of relief. Atsumu stood up, reached in the bedside table, and hid whatever he grabbed from Kiyoomi's gaze.
“Close your eyes, Omi.”
Kiyoomi did as instructed. Disobedience led to a punishment, and he always ended up doing whatever Atsumu wanted in the end. He didn't feel like being a brat tonight.
He felt Atsumu shuffle to his spot between Kiyoomi's legs, he whined when Atsumu slid his cock inside Kiyoomi's hole, and he froze when he felt something silicone brush his cock.
“Open your eyes, baby.”
Kiyoomi did, and his breath caught in his throat.
Atsumu had the Hitachi wand pressed against Kiyoomi's cock. That was the toy that had made Kiyoomi come in his cage.
He swallowed nervously, about to ask for Atsumu to take it easy, when Atsumu thrust inside of him and turned the toy on full blast.
Kiyoomi screamed.
He could feel another orgasm rapidly approaching, and he couldn't do anything about it. He thrashed around, but he could barely move.
Atsumu pressed the toy down harder, squishing Kiyoomi's cock with it, and he came.
He knew it was an orgasm, but it was almost entirely pain and no pleasure. A massive wave of overstimulation and soreness crashed through him, and he let out a sob.
He kept crying as Atsumu fucked him, the toy still rumbling against his cock.
“Don't you love this, Omi? You've been locked up and unable to come for so long, isn’t it nice getting to come over and over?”
Kiyoomi shook his head. He couldn't take it anymore.
He didn't know how many times he came as Atsumu continued fucking him. He just wanted it to end.
He didn't even notice when Atsumu came, he just realized that he had pulled out and the toy had stopped.
He sniffed and looked blearily at Atsumu, who was holding him and stroking his hair. His hands were untied and the spreader bar was gone. He didn't know when that happened.
“There, there, Omi. There's my good boy.”
Kiyoomi stuck his face in Atsumu's chest, nestling into him. Atsumu stroked his back.
“You're so perfect, honey. You took all of that so well, even though I know it was probably a little scary.” He wrapped his arms around Atsumu. It had been scary. He was still scared.
Atsumu held him even tighter, and he relaxed in his arms.
It was scary, but it would be all right.
---
When Kiyoomi woke up in the morning, it was to a very sore dick.
He peaked down the covers that Atsumu had tucked him in, and saw that nothing had changed from last night. His cock was still tiny. Maybe slightly puffy from all of the abuse that it had gone through.
He poked it and shivered. Atsumu was right. It's not like having a micro dick and no cum would affect his sex life. Atsumu was probably going to lock him back up sometime soon, and dick size didn't matter when it was locked away. He agreed with Atsumu that it was hot, but there was no way that he was going to tell him that.
Atsumu shifted in the bed before throwing an arm over him and cuddling him, body warm from sleep. Kiyoomi smiled and wrapped his arms around Atsumu before drifting back to sleep.
When he woke again, Atsumu was peppering kisses all over his face. He finished with a wet one on Kiyoomi's cheek which made him wipe his cheek and push Atsumu with an “ew.”
Atsumu just laughed and helped him get out of bed, bringing him to the kitchen table without letting him put on clothes.
Kiyoomi sat down and started eating from what Atsumu had prepared while he was sleeping, hungry from all he had been through in the past twelve hours.
Atsumu acted like nothing was different, chattering about their plans for the weekend as they ate their food.
When they finished, Kiyoomi took their dishes and put them in the sink, getting ready to clean them.
“You know,” Atsumu started. Kiyoomi tilted his head, showing he was listening, but he didn't turn around.
Pain exploded in between his legs and he fell to the ground, gasping for air. His eyes unfocused and focused as he grabbed his balls in reflex.
He looked up at Atsumu, who was grinning as widely as possible as he stared down at Kiyoomi.
“I never got to bust your balls last night.”
Kiyoomi whimpered, but Atsumu just grabbed his hands and handcuffed them behind his back so he couldn't clutch at himself.
He looked at Atsumu's feet and saw that he was wearing his brand new boots that he had been so eager to buy.
He didn’t realize this was the reason Atsumu was so excited.
Atsumu raised his foot, knee up to his waist, and slammed his boot onto Kiyoomi's balls.
Kiyoomi screamed. Atsumu hadn't lifted his foot; he was twisting it, squishing Kiyoomi's balls flat against the floor.
“They're useless, right? Can't make cum. Their only purpose is to bring me joy, right baby?”
Kiyoomi felt the tears falling down his face as Atsumu finally lifted his boot, only to bring it down again. It seemed like he was putting all of his weight on his foot, trying his hardest to crush Kiyoomi's balls completely.
Atsumu had never hurt his balls like this before. Kiyoomi was in agony. He needed to get away, but his body was frozen in pain.
Atsumu stepped back, not letting Kiyoomi's legs close, kicking Kiyoomi's balls with the tip of his boot.
He changed his momentum slightly, and kicked Kiyoomi's microdick.
The pain didn't travel to his guts like it did when Atsumu kicked his balls, but it fucking hurt. His dick was still sensitive, not healed at all from being rubbed raw last night, and Atsumu was kicking it as hard as he could.
Kiyoomi wasn't able to sob, all he could do was gasp for air as tears continued falling down his face.
Kiyoomi had no idea how long this went on. He was in a daze, unable to think of anything except the fiery pain between his legs that twisted to his stomach.
Eventually, the pain became too much to handle, and he blacked out.
When he came to, he was lying down on the couch, ice pack on his balls, head on Atsumu's lap. The ice pack was probably helpful, but it still felt like his balls were on fire.
He groaned. He was scared to lift the ice pack and see the damage, so he didn't. Atsumu was playing with his hair.
“There's my Omi. How're you feeling?”
Kiyoomi glared at him. “Like shit.”
Atsumu pouted. “I thought maybe it wouldn't hurt so bad. You know, since they don't make cum and all, I wasn't sure.” He removed his hand from Kiyoomi's hair, took the ice pack off of Kiyoomi's crotch, and squeezed Kiyoomi's balls.
Kiyoomi squealed and squirmed, trying to get away. But Atsumu held on steadily, only gripping him harder, forcing Kiyoomi to hold still. Atsumu wouldn't let go no matter how hard he pulled away. He had to stop him.
“They hurt! They hurt more than they ever have!”
Atsumu hummed and let go. “Really? More?” Kiyoomi sniffled, nodded, and clutched at his balls.
Atsumu seemed to be deep in thought, looking at the TV in front of them. After a couple minutes, he looked down at Kiyoomi.
“I think I'll let the team know that your balls need a little extra attention again this week.”
Kiyoomi blanched. “What? Why?”
Atsumu shrugged and looked back at the TV. “I don't need a reason. I just think it'll be fun.”
---
Kiyoomi was shuffling through his underwear drawer, trying to find his softest pair. He wasn't looking forward to practice today. Atsumu had probably told all of their teammates that his balls were free game already.
“How about this pair?”
Kiyoomi glanced at the lace panties that Atsumu was holding up. He'd worn them once before, and had made sure to never wear them again.
“No thanks, that pair is super scratchy.” He kept looking through the drawer, trying to find something comfortable, when Atsumu pulled him back gently by his shoulder.
“I wasn't really asking, Omi. You're wearing these today.” He held them out, and Kiyoomi took them, eye twitching.
This day was going to suck.
---
The underwear chafed against everything. His dick still felt raw, and he knew that the scratchy lace would ensure it stayed that way.
His balls were beyond bruised. Walking hurt. Having them scrape against his worst pair of panties made it about ten times worse.
When they got to the locker room, Kiyoomi was immediately greeted with a hug from Bokuto. He was surprised, but instinctively lifted his arms to hug back.
And then Bokuto slammed his knee against his balls.
Kiyoomi moaned in agony and started to fall, only to be held up by Bokuto as he chit chatted with Atsumu.
“Did you see the game on Friday?”
“Duh, Aran was playing.” Bokuto laughed, and he made sure that Kiyoomi was steady on his feet before letting him go.
“See you guys in the gym!”
It was going to be a long practice.
---
During the week where the team went after his balls before, they generally kept up the facade of it all being accidental.
That facade wasn't there anymore.
First there was Bokuto’s knee, then Inunaki’s not-so-playful “nut check” when Kiyoomi was in front of his locker (He thought nut checks were supposed to be taps. Not full force punches.). At least five serves were aimed at his crotch, and even more spikes.
He really wished he could wear a cup, but Atsumu would never allow that.
Finally, practice was winding down. Kiyoomi was beyond eager to get home.
“Hey Sakusa, come help me stretch.” Kiyoomi knew he could trust Meian. He had never participated in his ball busting. Sure, he hadn't stopped the team, but at least he hadn't ever actually made Kiyoomi double over in pain.
Kiyoomi walked over. He pressed down on Meian’s back, bending over to help him reach further.
A foot came flying up between his legs, crushing his balls against his body.
Kiyoomi fell to the ground in pain and watched, horrified, as Meian high fived Barnes. He gasped for air.
“Bit of good team building, right, Sakusa?” Meian asked Kiyoomi, grinning. He whimpered in response.
After a few more “nut checks” in the locker room, Kiyoomi was finally going home with Atsumu.
His balls felt even worse than they had the previous day. He was practically hobbling.
He let out a sigh.
“I can't wait for this week to be over.”
Atsumu looked at him questioningly. “Why?”
Kiyoomi looked at him like he was stupid. “The team will lay off after a week. Remember, you said you'd tell the team to do this for a week?”
Atsumu scratched his chin. “Oh yeah, I guess I did tell you a week. Hate to break it to you, but I didn't tell them a week. Kinda told them that the previous week had been a trial run, and that they were good to bust your balls until I told them to stop. I also told them that they didn't go hard enough last time, and to knock off the apologetic act. Who knows though, maybe they'll get tired of it before I do.”
Kiyoomi stopped walking, horrified.
That was going to be his every day, for who knows how long.
He was totally fucked.
---
Eight months.
Eight months of volleyballs aimed at his crotch. Eight months of nut shots in the locker room. Eight months of getting kneed, kicked, and punched in his most sensitive area.
One day, Bokuto took a metal baseball bat to practice and “accidentally” smashed it in between his legs.
Four times.
It became a monthly tradition for Atsumu to tie Kiyoomi up in the locker room, legs spread wide, and to let the team at his balls for as long as they wanted. It always lasted at least three hours, and they would all compete to see who could get the best reaction out of him. “Team bonding,” they said.
Kiyoomi would do anything for it to be over, so when Atsumu told him that his dick was too small for a cock cage, and that he'd have to wear a chastity belt, he saw it as a blessing.
Atsumu's eyes were twinkling when he locked Kiyoomi up, but he didn't think much of it. He was probably just laughing at Kiyoomi's pathetic excuse for a dick. Or maybe he was laughing at how Kiyoomi's balls, which had been bruised for a solid eight months, would be painfully squished against his body.
Kiyoomi didn't care. They would finally be able to heal.
The team returned to normal, no longer hitting Kiyoomi's balls at every chance they could take.
Kiyoomi couldn't touch his dick, but he was in bliss.