Archive of Our Own

   Denki yawned as he slowly rose, rubbing the sleep from his eyes. He took off his pj pants and opened up the tote hidden underneath his bed. He pulled out a diaper and slipped it on, taping it tightly to his waist. He pulled on his uniform pants and looked in the mirror, checking that the diaper wasn't visible. Even after all these years, Denki still feels anxious about his condition.

 Denki had had this problem since he'd gotten his powers. Sometimes when he used his electricity, and he just...peed. He couldn't stop it. Couldn't even feel the need to go half the time. It just flooded out without warning. Even when he wasn't using his powers though, electricity thrummed through him 24/7, the constant little shocks it gave him making him hyper sensitive to everything. Or maybe that was because he has ADHD. But either way, the shocks also weakened some of his organs, including his bladder, which made him unintentionally release sometimes. It usually never got to the thorough soaking level that it did when he had let off a huge shock, but it was enough to be embarrassed about.

 Embarrassment was something Denki was used to though. He was constantly embarrassed by his incontinence, always anxious that someone was going to find out. It was harder now that he was living in dorms. Denki's parents had never paid much attention to him, often off on trips, leaving Denki alone, sometimes for months at a time. Denki had learned quickly how to forge his parents' signatures and how to budget on the little money they sent him while they were away. It had been easy to hide the diapers then because there hadn't been anyone to hide them from. At school, it had obviously been a different story, but his house was a place where he at least didn't have to worry about hiding it amongst the many other things he had to worry about. 

  In dorms though, people were around, and people noticed. It had become a lot harder to hide his condition and he'd ended up having to skip on diaper changes at times. He'd developed a rather nasty rash as a result, and Denki had to hold back a wince everytime he sat down. He was constantly worried that someone was going to find out and he was going to be kicked out of his dream school because he couldn't stop being a baby. 

 Denki slipped his shirt and jacket on, sloppily tying up the tie. He stuffed two extra diapers into his bag just in case but didn't bother to bring the baby wipes too; today was a training day, which meant that he wouldn't have time to wipe himself anyway. He bolted out the door, heading towards the kitchen. Denki smiled as he arrived just in time for Katsuki to set a pile of fresh pancakes down on the counter. 

"Hey, get a plate, dumbass!" Katsuki nagged as Denki picked a pancake up in his hand. 

 Denki stopped on his quest to shove the pancake straight into his mouth, taking the plate and utensils that Katsuki shoved into his chest. Denki plopped himself onto a stool, grimacing as the material of his diaper rubbed against his rash. 

"Hey, Denki! You're up early." Eijirou cheerily called as he entered the kitchen.

"Hey baby." Eijirou kissed Katsuki on the lips in greeting. 

"Gross." Denki teased the two. 

"Fuck off, and die, idiot!" Katsuki flipped him the middle finger.

"Hey! Good morning, guys!" Mina happily bounced into the kitchen, her smile widening as she spotted the pancakes. "Ooh, yay! Pancakes!" 

 Katsuki smacked her hand away as she tried to pick one up.

"You're worse than Sparky! Don't act like a fucking animal!" Katsuki chastised as his boyfriend calmly passed Mina a plate and utensils. 

 Mina sat down beside Denki with a smile, wolfing down the pancakes hungrily.

"Good morning, gang!" Hanta greeted, his hair half sticking up from bedhead. "Ooh, pancakes! Save some for me!" 

 Hanta rushed over to squeeze himself in next to Mina, taking the offered plate and utensils with a groggy 'thanks', and digging in. 

 They chatted as they ate, Katsuki roughly cuffing anyone who talked with their mouth full. Denki drank a little bit of orange juice, but not much; he had found that if he cut back on how much he drinks, then he didn't have accidents as much. Doing so left him with a bad case of dry mouth and dizzy from dehydration, but at least his diaper had never leaked. No one seemed to notice when Denki dumped the rest of the orange juice down the sink after breakfast.

 Denki lazily followed after the others to class, hanging behind with Mina. Denki sighed as they entered the classroom, not eager to sit on his rash for another eight hours. Denki covered his wince with a fake sneeze as he dropped down into his chair, pretending to be his normal self despite the pain. The rash was becoming unbearably irritated and Denki wasn't sure how much longer he could hide it. 

 Denki perked up as Aizawa shuffled into the room, eager to have a distraction from his rash. His relief soon turned into frustration as he once again found himself unable to copy down notes. He just couldn't read. Everything was backwards and jumbled. He had absolutely no clue what was written on the board.  His frustration was only amplified when he felt a sudden warmth in his diaper, cringing as the urine left a cold, sticky feeling on his skin. 

 Denki shifted in his seat uncomfortably, not wanting to ask to go to the bathroom to change. He knew it was ridiculous, but every time he walked past someone with a full diaper, he felt like they knew what he'd done. Denki was sure that if he walked in front of the class that he was going to waddle, or his diaper would leak, or he would smell, or his pants would somehow fall down, something embarrassing; and he'd be laughed out of UA. There was no way he could risk that. 

 Denki sat in his wet diaper for hours, his eyes nervously darting around as he felt the stench reach unbearable levels. He shot up as his second class* finally ended, quickly heading off to the bathroom to replace his diaper. Denki slipped the old one off and the new one on in a matter of seconds, nervously sweating as his fingers slipped on the tapes. Denki flinched as he heard voices outside the stall and quickly finished up, balling the old diaper up tightly and wrapping it in toilet paper to conceal it. Denki pulled his pants up and tried to look as natural as he could as he subtly tossed the diaper into the garbage. Denki washed his hands and got out, rushing over to the cafeteria. 

 Denki sat down at his friends' table, and stole a fry off of Hanta's plate.

"Hey! Get your own food!" 

 Denki couldn't afford to buy food. His allowance from his parents had been stopped once he'd moved into dorms. Denki had complained to his parents, trying to tell them that he needed money for lunch, but they, predictably, hadn't listened. They saw Denki as nothing more than a burden on them, so they didn't care if their child went hungry. In their opinion, as long as he had breakfast and dinner, he was fine. But Katsuki didn't make breakfast every day, and it was hard to have to wait until dinner to eat, especially on training days. It didn't help that Denki was severely allergic to nuts (not that his parents believed him about that), so there were a lot of meals he just simply couldn't eat. 

"Hey Sparky! Eat properly, dumbfuck!" Katsuki yelled as Denki stole a piece of cheese from Mina. Despite his anger, Katsuki shoved his bento box out, putting it halfway between them. "Here! Eat up, dumbass!"

"Thank you." Denki opened a pair of chopsticks and happily dug in. 

"Fucking spot me next time, Sparky!"

"Sure." Denki's stomach twisted in knots, knowing he'd never be able to live up to that promise. 

 Denki quickly wolfed down the food, disappointed when it was gone. He was still hungry but at least he wasn't as starving as he usually was. Denki sighed as the bell rang, signaling the end of lunch. He solemnly plodded after his friends to his most dreaded class of the day. Denki had been the most excited about quirk training when he had first come to UA, but now he was afraid of it. Everytime he had a quirk training class, he always filled his diaper. He struggled to keep his focus and attention on the training and not his issues, but they were impossible to ignore. The training was going to suck even more today with his rash. 

 They got to the changing rooms and went to their separate lockers, taking out their gym clothes. Denki hated their gym clothes. They were comfortable and light, but unlike his school uniform, there was no extra layer of jacket to cover his diaper. The feeling that everyone could see it increased ten fold and it left Denki in a constant anxious state. It was the worst. No one questioned Denki when he changed in one of the stalls in the changing room instead of out in the open with the others, lots of people were self conscious about their bodies after all, so he was hardly the only one who preferred them. 

 Denki shuddered as they entered the gym, Aizawa sensei already there. There were no obstacle courses set up or dummies for the teens to practice on. Which meant the worst possible scenario. Sparring. Denki cursed his luck. He always had to use a lot of electricity when he sparred, which meant a lot of accidents. Denki just prayed that today would not be the day that his diaper leaked. Or any other day, for that matter. But Denki just focused on making it through today. 

 He listened intently as Aizawa rambled off the pairings. Denki let out a sigh of relief as he was paired against Uraraka; he could get away with using little electricity with her. Denki watched as the sparring began, his nervousness getting stronger as his turn approached. 

"Kaminari and Uraraka." His teacher dryly announced, motioning them off the rafters. 

 Denki took a deep breath and stood up, wincing as his rash was irritated. He stood opposite Uraraka and bowed, waiting for Aizawa's signal.

"Start." 

 Denki and Uraraka circled each other carefully. Uraraka made the first move, touching her hands together and lifting Denki off his feet. Denki sent a small bolt of electricity at her and surprised Uraraka, causing her to drop him. She quickly gathered herself and tried to land a punch, but Denki slid around her, delivering a small shock to her neck. Uraraka jolted and spun around, clapping her hands together and making both Denki and herself weightless. She launched herself towards Denki in the air, Denki getting easily bowled over as the zero gravity quickly made him nauseous. Denki winced as Uraraka landed a kick to his stomach and shot out a bolt of lightning at her. Uraraka seized up and dropped them both, sending them crashing to the ground. 

"Ugh." They both groaned as they hit the floor hard.

"Alright, enough. Go sit down." Aizawa snapped his fingers towards the rafters.

 Denki and Uraraka sat down guiltily, knowing their teacher was probably going to chew them out later. Denki solemnly watched as the rest of the pairings matched up, hiding a blush in his hands when he had a small pee in his diaper. Denki only half listened as Aizawa dryly rambled out the second round of pairings. Denki cursed his luck for what felt like the thousandth time today. He was up against Todoroki. Just his luck. Denki tapped his foot nervously as his turn approached, wondering if it was a good idea to feign illness instead. 

"Todoroki and Kaminari." 

 Denki reluctantly decended from the rafters, trying to calculate just badly he was about to get crushed. He anxiously stood opposite Todoroki and bowed, fruitlessly hoping that maybe his teacher would suddenly change his mind. 

"Start."

 Todoroki attacked first, launching ice that Denki had just barely enough time to dodge. Denki jumped as the dual haired teen shot ice at his feet and sent a large bolt of lightning at him. Denki blushed as his diaper flooded with warmth, already heavy between his legs. Denki rolled away as another stream of ice was shot at him, cringing as the motion caused the diaper to press into his skin. Denki touched the ground and sent out a strong shock, grimacing as his diaper grew heavier with urine. Todoroki's body seized and he stumbled slightly, but quickly popped back up into a fighting stance. Denki's diaper felt like a bowling ball between his legs as he stood. He dodged a blast of fire, and caught Todoroki off guard with another shock to his cheek. Todoroki jolted and slammed ice down, Denki not able to jump out of the way in time for it to catch him, and he found himself half stuck in ice. Denki's face flushed as more urine filled his diaper, worried that his diaper was going to leak.

"Alright, enough. Todoroki, free Kaminari please." 

 Denki shivered as Todoroki slowly melted him out of the ice, his anxiety going through the roof as Todoroki suddenly reached down and grabbed his thigh. Todoroki pulled one leg from the ice, then did the same with the other one, offering a hand to help Denki step out. Denki nervously took it and let the stoic boy pull him out of the ice completely. 

"Thanks." Denki said before practically bolting back to the rafters. 

 He didn't want to be around Todoroki any longer. Not that he hated the guy, it's just that, the ammonia scent was rolling off Denki in pungent waves, and the longer he spent close to someone, the more likely they would notice it. Luckily, Todoroki didn't seem to take offense to his behavior and calmly sat down beside Midoriya. Denki barely paid attention as the rest of the pairings matched up, his eyes glued to the clock as he squirmed uncomfortably in his own urine. His rash burned and Denki just wanted to go change. 

 Finally the bell rang and Denki ran off into the change rooms, grabbing his uniform and skidding into a stall to change. He was on his way to bolt to his bedroom when he was suddenly stopped by Katsuki's hand grabbing his arm. 

"Hey, fuckface! Where do you think your going?!" 

"My room?"

"As if, nerd! I saw your mark in English class! We're fucking studying!" Denki's heart sank.

"Can I go to my room first?"

"Don't pretend, Sparky! You're just gonna run off and avoid studying!" Denki winced guiltily, that had been his plan. "You're coming with me, dunceface!" 

 Katsuki pulled the dejected Denki to his room and shoved him down into a beanbag. Katsuki angrily ripped through his bag and took out his own pen and class notes, motioning for Denki to do the same. Denki reluctantly dug them out, settling in for another few hours of irritation, pain, and grossness. Great. Denki's anxiety only spiked in the small room, he felt like his diaper smelt like a thousand dumps all burned together. All he could smell was ammonia and his heart hammered as he hoped that Katsuki couldn't smell it too. 

 His anxiety got worse as Eijirou entered the room, coming to sit in between his boyfriend and Denki. Denki returned the redhead's greeting with a half hearted wave, only half paying attention to what Katsuki was trying to teach him. Denki wiggled uncomfortably as the minutes slowly passed, hiding winces as his rash burned more intensely than ever before. At the end of the hour Denki was in excruciating pain, and had to hang his head on the table to hide the tears welling in his eyes as his wiggling became more desperate.

"What's wrong, nerd! Do you need to fucking piss or something?" Denki winced as Katsuki almost hit the nail right on the head. 

 Denki shook his head. He was scared if he got up right now his friends would notice his sagging diaper. 

"Then fucking figure something out, Sparky! Your wiggling is pissing me off!" Denki fought back a sob. That was something he had heard from his teachers many times.

 Stop moving. Sit still. Pay attention. Stop doing that. You're disrupting the class. You're being annoying. Just sit still. Focus. You just need to try harder. You're not trying hard enough. You're stupid. His teacher's words to him rang in his head and his chin started to shake. 

 "Are you ok, Denki?" Eijirou asked, placing a gentle hand on Denki's shoulder. 

 Denki fought against the oncoming tears, everything was too much right now. He couldn't pay attention, he couldn't read properly, he was doing poorly in all his classes, he could never remember anything, his bum was on fire, his diaper was full, and he was a big, dumb, stupid baby who couldn't keep his pants dry and certainly didn't belong at UA. Denki's body shook, embarrassed to be crying in front of his friends.

"What's going on, nerd?" Katsuki leaned towards him. 

"Nothing. It's fine. I'm fine." Denki rubbed his teary eyes harshly with his fists.

"Denki," Eijirou's tone was soft as he tried to pry Denki's hands from his face. "you know you can tell us anything right?"

 Denki nodded and his stomach twisted in guilt. He could never tell his friends what was really wrong. Denki pathetically whined as Katsuki joined his boyfriend in his efforts to pry Denki's hands away. 

"Tell us what's going on, Sparky." 

 Denki sniffled, his face flushing with embarrassment. It quickly turned into full on humiliation as Katsuki suddenly stopped and sniffed the air. 

"What's that smell?" Katsuki quickly plugged his nose with a nauseous expression. 

"Yeah, what is that smell?" Eijirou asked as he too sniffed the air. 

Denki prayed to whatever deity was listening to just kill him now. 

"Did you piss, Sparky?" 

Denki sank in guilt. "...no." 

"Well it wasn't me, and I know it wasn't Eijirou because he looks as confused as I am." 

"It's ok, Denki," Eijirou lifted Denki's burning face to meet his eyes. "just tell us the truth. We won't judge you for it." 

 That broke the dam. Denki couldn't hold back the tears as they poured down his face, breath pathetically hitching between gut wrenching sobs. 

"I-I-I'm sorry." Denki blubbered out. 

"What for, dunceface? It fucking happens." 

"I-I didn't mean to, I swear!" Denki wailed out.

"We know you didn't mean to."

"I-I just...went." Denki sniffled as Eijirou rubbed his back. 

"Are your pants still wet, nerd? I want to know if I gotta clean my floor." 

 Denki just sobbed harder, unable to answer his friend. 

"Here, let me feel, Sparky." 

 Denki didn't have time to react before Katsuki's hand was on his bum, and patting it cautiously. Denki sat in silence, absolutely mortified. His friends knew his secret now. There was no going back. This was the end for him.

"Denki..." Katsuki slowly started, causing said teen to flinch. "Is that a diaper?"

"...yes." Denki mumbled out. "...I'm sorry."

"Denki, why are you wearing a diaper?" 

"I-I'm sorry! I can't control it! I swear! I just go. You have to believe me." Denki said the last part in a barely audible whimper.

"Of course we fucking believe you, dumbass." 

"How long has it been since you last changed?" Eijirou asked with trepidation.

"...lunch."

"Lunch?! How long have you been sitting in your own piss, Sparky?!"

"...few hours."

"A few hours?!" Denki's stomach twisted in knots. "Denki, that's not good. You probably have a rash."

Denki sniffled and sank further into himself.

"You do have a fucking rash." Katsuki stood up, offering Denki a hand. "Get up, nerd. We're going to Recovery Girl."

Denki's heart sank. "No, please."

"Yes, Denki," Eijirou pulled Denki up to stand despite the smaller teen's protests. "that rash needs to get checked out." 

 Denki wiped his tears and looked at the floor. He knew that they were right, and he would honestly like to get rid of his painful rash. 

"...can you come in with me?" There was no way he could face her alone. 

"Of course, Denki."

"Let's go, nerd." 

 Denki plodded slowly alongside his friends, happy to find the hallways mostly empty. He jolted as Katsuki loudly knocked on Recovery Girl's door. 

"Yo, Granny, you in there?" Denki desperately hoped that she wasn't.

His hopes were dashed when the door swung open to reveal the short old woman. 

"If that idiot Midoriya has broken something again, I swear, I'm going to strap that boy to a bed for a week." Chiyo grumbled as she observed the teens.

"Actually," Eijirou slowly started. "that's not what we're here for." 

"Well, what is it then?"

"Can we come inside?" 

 Denki shuffled into the medical bay, wincing as he awkwardly sat down on a chair. Denki looked between his friends, who were seated beside him, and Chiyo, not sure how to start.

"So," Chiyo started after a long silence. "is someone going to tell me what's going on?" 

"Kaminari is fucking incontinent." Denki hung his head as Katsuki blurted it out.

"...I see." Chiyo grabbed a pen from her coat and wrote something down on her clipboard. "How long have you had this problem, Kaminari?" 

"...since I got my powers."

Chiyo nodded and noted that down. "And do you happen to know the cause of your incontinence?" 

"I think it's my powers. I constantly receive electric shocks from them. It weakens some of my organs." 

Chiyo paused in her writing. "What other organs are affected?" 

"My liver, my kidneys, my stomach,...my heart." 

Chiyo's eyebrows shot up. "Your heart?"

 Denki guiltily nodded, sinking under his friends' disapproving glares.

"That's serious, Kaminari. I'm going to schedule you for an ECG tomorrow." Chiyo quickly wrote that down.

"Now," Chiyo turned back to Denki. "back to the matter at hand. Do you wear protection?"

Denki blushed and hid his face.

"Yeah, he wears a fucking diaper." 

Chiyo nodded. "Good. Have you been changing it regularly?" 

"No, he hasn't." Eijirou answered for him before Denki had a chance to lie. "He told us that he hasn't changed for several hours." 

"Yeah, and he has a fucking rash."

"I see," Chiyo hummed. "I assume that's the reason for your visit." 

"...yes."

"Alright," Chiyo snapped some gloves on and motioned to a cot. "hop up. Let's take a look." 

 Denki nervously looked between the bed and his friends before slowly standing up and hopping up onto the bed while Chiyo grabbed some rash cream and another diaper.

"Is sitting in your own urine a typical occurrence for you?" Chiyo's voice was clinical, not an ounce of judgment, but Denki couldn't help letting out an embarrassed whimper. 

"...yes." 

 Chiyo tutted and turned away, walking over to a cabinet where she pulled out a package of baby wipes.

"Alright," Chiyo motioned to Eijirou and Katsuki. "Come on over, boys. You're gonna learn how to change a diaper." 

"What?" Denki flushed with shame. "No."

"Yes, Kaminari. You haven't been taking care if it yourself. Obviously you need help with this." Chiyo glared disapprovingly at him. "And I frankly don't trust that you'll change yourself."

"It's fine, Denki. We don't mind helping." 

 Denki sniffled pathectically despite Eijirou's reassurance. 

"Shoes off and lay down flat on the bed for bed." 

 Denki toed his shoes off and slowly shifted to lay down on the cot, accepting his fate. Denki flinched as Chiyo's hands undid his belt and unzipped his pants.

"Hips up." 

 Denki covered his face as he lifted his hips, allowing Chiyo to slide his pants off him. He whined in mortification as his sodden diaper came into full view. 

"That's a lot of urine, Kaminari. Do you have any control over your bladder?"

"No." Denki heard Chiyo's pen scratch against paper.

"What about your bowels? Any trouble with them?" 

"Some, but it's easy to manage." 

Chiyo hummed and noted it down. 

"Good. Now," Chiyo set the clipboard down. "Let's get you changed." 

 Denki squirmed and blushed deeply as Chiyo's hands touched the top of the diaper. 

"It's nothing I haven't seen before, Kaminari, I assure you." Chiyo gently said as she undid the tapes. 

 Denki sobbed as his diaper was opened, revealing everything inside. 

"I know. Lift your hips." Denki followed her instructions and lifted his hips, feeling the old diaper slide out from underneath him and a new diaper slide in. Denki heard the wet diaper being thrown in the trashcan soon after.

 Chiyo grabbed one of Denki's legs and tried to push it up. "Legs up." 

 Denki just lay there, not sure what she meant.

"Grab his ankles please." 

 Denki let out an embarrassing squeak as Eijirou's hand wrapped around his ankles and pulled his legs up and back towards his chest, revealing Denki's whole bare bum to Chiyo.

Chiyo hummed. "That is a nasty rash." Chiyo dug out a baby wipe. "Listen up, you two." Chiyo motioned to Katsuki and Eijirou. "This is how to change a diaper."

 Denki cried out and wiggled as the cold wipe touched his skin. Denki whined as he was throughly cleaned, the feeling foreign and uncomfortable.

"First you give him a new diaper, we already did that." Chiyo instructed. "Then you bring his legs back and clean him throughly. Make sure to get his crack." 

 Denki cried out as Chiyo wiped along his crack, flinching as she spread his cheeks to see. "Then you can drop him down." 

 Denki legs were lowered back to the bed and Eijirou's hand disappeared. Denki whined as his legs were spread, wiggling restlessly.

"Relax, Kaminari. We're almost done."

 Denki stilled as the wipes ran along his thighs, blushing furiously. 

"Make sure to get the insides of his thighs too." Chiyo continued. "Then you're going to start on his genitals."

 Despite the warning, Denki cried out and reached to stop Chiyo as the wipe touched his privates. His arms were snatched by Katsuki before he could get there and Eijirou put a hand on his hip to keep him from trying to turn over. Denki sobbed as Chiyo continued, wiping his privates gently.

"Make sure to clean around the foreskin, and in the folds on the testicles." Chiyo instructed as she dutifully wiped the urine away. "And when you're done wiping," Chiyo threw the wipe in the garbage and twisted the lid off of the rash cream. "you start applying the rash cream. If he has a rash."

"Legs up." Eijirou grabbed Denki's ankles again and brought his legs back. 

 Denki shifted as the rash cream was applied to his skin, the thick substance uncomfortable on his skin.

"Make sure to get the whole area, spread it evenly." Chiyo said. "Legs down." 

 Denki whined as his legs where lowered and his legs were once again spread. He wiggled against the sensation of the cream being smeared on his inner thighs and genitals. 

"And you're done." Denki let out a sigh of relief, feeling the diaper flipped up to re-cover him. "You pull the tabs out, and wrap the diaper, tape side on top, around the hips. You tape it up tight," Chiyo taped up one side quickly before continuing to the other. "and do the same thing on the other side."

"Alright, Kaminari. You can get dressed now." 

 Denki let Eijirou help him off the bed, not complaining when his friends helped slide his pants on for him and tied up his shoes. He was honestly just tired and wanted to go to bed. 

"Listen here, you fucking extra!" Katsuki pulled Denki into a surprisingly gentle hug and Denki returned it slowly. "Don't fucking hide shit!"

"Whenever you need a change, just come to us, and we'd be happy to help, Denki." 

Denki nodded bashfully before a sudden, terrifying thought entered his mind.

"You're not gonna tell anyone about this, are you?" Denki tentatively asked Chiyo.

"I'm afraid I have to inform your parents as well as Aizawa. But no one else needs to know." She gave him a sympathetic smile. 

 Denki knew Aizawa wouldn't care, and if he did, Chiyo would probably knock some sense into him. But his parents...shit. Once Chiyo called his parents she would find out that they didn't care. He had gotten lucky that his parents had happened to be home when Aizawa had done home visits, and had been super lucky that they had been in the mood to pretend like they cared. His parents wouldn't make that mistake twice. 

 Denki yawned as he was escorted back to his room. That was a problem for tomorrow.