#1 Pro Baby: Deku (Patreon)

This is a Commission for Snakeman12. All characters portrayed are 18+

Izuku Midoriya swung his foot down to crush a villain terrorizing the city of Musutafu, Japan. All around him citizens watching cheered, enjoying the spectacle of the number one pro-hero: Deku saving the day. After he finished his education at UA the ambitious young man was fast-tracked into the position, especially with all the amazing feats he’d accomplished while still in high school. With One-for-All’s abilities and his extensive experience, he found most day-to-day threats to the city were trivial for him.

This itself was his fourth encounter today, and each scuffle was always followed by interviews and autograph signings for excited fans. Being a pro-hero was more than just saving the day–it was maintaining an approachable and respected image that the public could look up to.

Midoriya himself knew this better than anyone, having been the biggest fanboy of pro-heroes in his youth. Still, as much as he enjoyed his life it was still a job and after an extra-long day, he was happy to open the door of his apartment and relax for the evening.

Upon entering the front door a wave of relief washed over the hero, giving him the first sense of calm he’d had all day. The dampness of his own sweat caused him to cringe a little. It was hard to keep a hero suit clean and fresh, and multiple hours of wear meant that he was more than a little ripe.

He took a quick look around the room, hoping to see the shining face of his housemate. Disappointment quickly set in as he realized that he was alone. “Must still be out…” he sighed, trudging down the hallway.

Slipping out of his clothing felt like a dream. The musky smell had built up from a day of crime-fighting and was wafting from the discarded garment. Midoriya was thrilled to leave it behind for the heated water of the shower.

The stress from the day was quickly blasted away and soaking his fluffy hair under the warm stream, Midoriya enjoyed the relief of cleanliness. Through the ajar door to the bathroom he heard the sound of someone entering the house. A quick peek out revealed nothing, as he couldn't see through the steam pouring out of the bathroom doorway. He felt himself tense up and wished he'd shut the door in case it was a random visitor.

“~I’m back☆~” called a voice from the front room.

Midoriya felt his body relax, glad to hear that his housemate had returned, “ I-I’m in the shower.” he called back, resuming his cleansing.

Through the steam of the shower, a blonde figure appeared in the doorway, his sweeping hair shimmering in the light of the hallway behind him. “D-Did you want to join?” Midoriya asked nervously, continuing to scrub while the figure stared at him

In the doorway Yuga Aoyama brought his hand to his face and shook his head, chuckling at the offer. “~I think not this time Mon Coeur, I’ve got something else to take care of first.☆~” he said.

Midoriya nodded, seeming just a little disappointed by the rejection, but continued his shower nonetheless.

Aoyama instead entered the shared bedroom of the apartment, heading towards the closet off to the side. As tempting as a shower with his Midoriya sounded, he wanted to set something else up, something he’d been waiting to propose for a while now.

It took a little digging around to get to, but he quickly found the box he’d hidden in the back. An uneasy feeling ran through him as he pulled item after item out and laid them on the bed. He was taking a big risk with what he was about to propose and wasn’t sure how Midoriya would react.

When they’d met as students of class 1-A, Aoyama immediately noticed the struggle Midoriya had with his quirk, likening it to his own in childhood and the uncontrollable nature of his navel laser. Because of this, a kinship grew between them, quickly blossoming into a full-blown friendship. After that things developed even more and the pair found themselves dating. Aoyama’s outwardly boisterous personality sparkled next to Midoriya who was timid and reserved.

Upon graduating and joining the ranks of pro-heroes they immediately moved in together and almost a year and a half later they were still extremely happy as a couple. Even in all that time, Aoyama had a secret he'd kept from his long-time boyfriend. It’d taken him a long time to consider how to reveal it to Midoriya along with his fear of what he'd do if he was rejected. He’d long since hidden away every part of this secret he'd collected over the years, waiting until he felt the time was right. Today however, for whatever reason, he felt the courage and he wasn’t going to let it pass; he wouldn’t let his insecurities get in the way of this part of himself any longer.

Midoriya, having just finished his shower, slipped a towel around his waist and stepped out into the hallway. With the bedroom doorway to his immediate left he caught sight of Aoyama sitting on the bed looking down nervously. He immediately thought that something must be wrong as there was a vague worry in his partner’s eyes, and while his mouth was its usual coy v-shape, a slight upturn on the left side told him it was more of a nervous frown.

Upon entering the room the sleek white square in his partner's hand caught Midoriya’s attention. He found himself curious about what it was. The way Aoyama’s fingers slightly dug into it let him know it was plush and there was a small crinkle as he turned it in his hands. Though partially obstructed, he could see what looked like small, crayon-drawn stars all over the white exterior.

“Aoyama? What’s going on.” Midoriya asked

The normally flashy hero’s voice came out soft and low, his tone surprisingly serious. “I have something to propose.”

Midoriya brought his hand up to the back of his head feeling a strange worry fill him. He hadn’t seen his boyfriend like this in a long time and it was disconcerting to him to say the least. “What is it?” Midoriya asked, looking down at the other objects laying on the bed. Sitting there looked to be an old All-might T-shirt and an overly large blue pacifier, both things that confused him even more.

“~I wanted to try something new, something exciting!~” Aoyama said, his energetic voice returning upon sensing Midoriya’s willingness to listen. “~I want to make you Mon bébé, to tape you into thick diapers and care for you. I learned about it from a friend who called it baby play. It sounded very stimulating.☆~”

The request caused Midoriya to reel back a little, catching him off guard from not having seen this side of his partner before. They’d not explored something like kinks openly in their relationship, and this as a first step seemed a little extreme.

“I uh,” the fluffy-haired hero started, putting the pieces together in his head, “I’m not sure how I feel about that, it seems a little—odd?” Midoriya tried to pick his words carefully as he didn’t want to offend his boyfriend, but the initial idea of being diapered just seemed peculiar and he didn’t understand the appeal.

Meanwhile, Aoyama’s face fell and he was unable to hide his disappointment at rejection. Midoriya quickly tried to recover, not wanting any hurt feelings. “I’m not saying never!” he announced nervously, “I just don’t think I’m up for it right now.”

Aoyama stood from the bed, collecting his babyish accessories in his arms and placing them on the shared dresser. “~Don’t feel bad Mon Coeur, I’m sure my sparkling request was difficult to reject.~” he joked, only for his voice to once again drop into seriousness, “But really I understand why you might not want to try it yet. It’s okay, my charms can’t win you over every time.”

The babyish items were left on the dresser and the subject between the two was dropped, although a slightly tense aura hung in the air between them. Midoriya got dressed while Aoyama went to take his own shower, their lives continuing on normally.

The blonde didn’t bring up the idea of baby play to his partner again, however, for several days the diaper and its accessories remained on top of the dresser, plainly in view of the pair. For the first two days, Midoriya found himself wondering where they'd come from and if there was a better place for them than sitting on top of their dresser. Part of him wants to avoid bringing up the subject with Aoyama but  it still seemed a little sore between the two of them.

He followed that instinct and just occasionally stared at the offending objects, growing more and more curious about them. Over time they started to worm their way into his brain and Midoriya would catch himself absentmindedly thinking about the padding sitting and waiting on top of his dresser. After a week it was even starting to become a distraction while he faced villains.

On a day when he was alone in the apartment, he found himself approaching the menacing stack of baby clothes that sat there, seemingly waiting for him. Calm filled him as he picked up the plastic rectangle sitting on the wood surface. This thing he’d been so nervous about just days before was instantly demystified as he turned it in his hands.

Midoriya unfurled the plastic garment with a slow curiosity, watching the plastic shell scrunch and crinkle. At the edges of the bulging shell was ruffled elastic that snapped back when he pulled on it. The white exterior was interspaced with prints of crudely drawn crayon stars meant to make the padding look infantile. Having never spent time closely examining the anatomy of a diaper he found himself enthralled.

He pushed his hand into the inner pulp of the padding, feeling the soft material creep up the sides of his fingers while he pushed in, eliciting another crinkle from its outer shell. “It’s—really soft!” he noted, somewhat surprised at how nice the material felt to the touch.

The hero continued to fiddle with the nappy, testing its elasticity and shifting the inner absorbent core. At one point he considered taking it to the sink to see how big it’d swell when dampened but stopped himself. If he did that Aoyama would see it missing and start to ask questions, and he didn't want to make things any more awkward. He instead spent ten minutes examining the diaper intimately before putting it down

His attention turned instead to the other items Aoyama had left on the dresser. He’d noticed the pacifier before–it’d caught his attention before due to its size. The rubber bulb jutting out from the plastic mouth guard looked large enough to sufficiently fill his mouth and far too big for a pacifier’s original intended user. The “shirt” he’d seen wasn’t a shirt at all, but rather a leotard-like one piece with a snap crotch, decked out with the design of All Might’s old costume.

“That’s a really nice detail, even if he was wanting to dress me like a baby.” Midoriya said wistfully. He was still a huge fanboy at heart and his partner knew him well enough to indulge that side of his fluffy-haired boyfriend. It even had matching socks that looked like the ex-hero’s boots.

A wave of emotion welled up in his chest. Aoyama had gone to such lengths for this and to make it something that Midoriya could more easily enjoy because it catered to him a bit. “I-I should give this a little more thought…” Midoriya said to himself, eyeing the babyish items on the dresser. He recognized a little more that it was probably a difficult task for Aoyama to ask this of him.

Somehow in all this Midoriya had convinced himself that he’d be doing it for his boyfriend if he decided to play along and he didn’t quite register that the padding intrigued him as well. Over the next week however, it started to consume his thoughts more. His exploratory prodding had only led him to thoughts of what the padding might feel like wrapped around him. The idea of its bulk between his thighs was actually beginning to sound enticing and he found himself imagining what that soft core would feel like pressed against his sensitive bits.

The thoughts themselves began to become invasive over the next week, leaving the pro-hero distracted in both his personal and professional life. His fights and patrolling became more perilous as his attention was diverted. At home or with friends he started to imagine being diapered and if he’d be able to hide the embarrassing bulk under his clothes only to snap back to attention when realizing they’d been trying to get his attention for several minutes. A few times while passing drug stores he considered breaking down and buying a case for himself to see what it might be like to try being diapered privately before going to Aoyama with it, but he ultimately decided against it.

After almost a week of these thoughts invading Izuku Midoriya’s mind, he felt himself ready to talk to his partner about it again, bringing it up as a possibility. He sat on his couch while Aoyama was out, his leg bouncing uncontrollably. He was actually nervous about bringing it up again and was running through different scenarios in his head.

Being direct was likely his best option as he’d never been good at being playful or coy like Aoyama was. He also considered just diapering himself up and waiting in the middle of the living room for his partner but quickly became a blushing mess when imagining it. There wasn’t much chance to try anything anyways as minutes later his partner walked through the front door with a smile on his face.

“~Ah, chérie,~” Aoyama exclaimed upon seeing his boyfriend sitting quietly in the living room, “~I didn’t know you were sitting here alone, is something wrong?☆~“

Midoriya took a moment to pick his words carefully, watching Aoyama’s shimmering eyes full of concern, but when he opened his mouth no sound came out. He couldn’t bring himself to say anything about the previously proposed baby play.

“~What’s wrong?~” the blonde said playfully, “~did you actually decide to be mon bebe? Did you want Daddy Yuga to diaper you?~” He laughed nervously at the end of the intensely bold statement, maybe planning to pass it off as a joke, but was met with an overeager nod from his boyfriend. Dropping the playful tone he asked in earnest this time. “Are you serious?” he said carefully, “You want to try it with me?”

Midoriya, whose excitement was spiking more and more at the idea, kept nodding, still unable to vocalize his emotions at the moment. With a happy smile, Aoyama took his hand and led the fluffy-haired pro back to their shared bedroom.

In a flash Midoriya’s clothes were gone, Aoyama having stripped him quickly and pulled a vinyl mat from somewhere in the closet, instructing his exposed lover to lay down on it while he prepared. From below Midoriya watched as supplies were gathered, including the things left on the dresser a week and a half before.

Aoyama knelt down in front of his boyfriend who was lying on his back with his legs bent and still bouncing. “~Relax, mon bebe~.” the blonde said, “I’m going to take good care of you.~”

In reality Midoriya was bouncing with anticipation, and he couldn’t wait to feel that diaper around his waist. Before that though he watched his partner coat his hands in slick clear oil before pressing them against his pelvis and massaging it in. Midoriya let out a gasp and shuddered, thoroughly enjoying the touch of his partner so much so that his member jumped to attention.

“Y-Yuga, what are you doing, is this part of it?” he asked shakily,

The blonde gave a chuckle and continued to rub the slick baby oil all over his lover’s pelvis, avoiding the twitching member while he coated the rest of Midoriya’s waist. “~My goodness, so excitable already aren’t you?” He asked, “I’m oiling you down before I diaper you, it helps the baby powder stick and will keep you from getting a rash. Raise that wonderful bottom for me.~”

Midoriya did as he was told, allowing Aoyama to spread the slick oil all over his pale cheeks and his rosebud. “Wait,” He said, “What do you mean r-rash?”

Aoyama pushed down on Midoriya’s stomach, forcing him back down to the vinyl mat, and returned his attention to the still swollen member before him. This caused Midoriya to throw his head back and gasp again. “~When you have to use your diapers of course silly–what if I can’t change you immediately?☆~” Aoyama said.

If Midoriya could actually register the words he’d just heard through the intense pleasure of his lover’s touch he might have denied such a need. Actually using the padding was a step too far but at that moment it was hardly a concern for him.

Once Aoyama made sure Midoriya’s lowers were thoroughly coated he pulled his hands away, earning a slight whine from his partner due to the lack of release. “~No no mon bebe, we can’t end the fun just yet, but I looove how excited you are about it.~”

Midoriya, slightly embarrassed by his behavior, blushed and covered his face with his hands. He couldn’t believe he’d agreed to this, but more than that he couldn’t believe how much he liked it! While his vision was obscured he felt something gently landing on his slick, oiled groin and the slight scent of rose drifted into his nose.

Uncovering his eyes revealed Aoyama gleefully peppering his groin with white powder from a bottle marked “baby powder”. Once Midoriya was completely coated his boyfriend brought forth the main event, the white, star-patterned diaper that sat on their dresser.

Without prompting the fluffy-haired hero pushed up and raised his powdered bum off the floor, leaving space for his new caretaker to slip the thick padding underneath him. With a laugh Aoyama brought the front of the padding up, wrapping its soft core around Midoriya’s still-prominent erection. The thick padding bulged out between his legs, completely conforming to the protrusion in its pulpy core.

Aoyama offered a hand to Midoriya to help him stand and get a better look at his newly diapered boyfriend. The thickness filled the space between the hero’s thighs nicely and he automatically fell into a wide-legged stance just to accommodate his new padding. The arousal in his nappy didn’t die down either, instead remaining a constant while his partner looked him over with a glimmer in his eye.

“~You look just as cute as I suspected you might mon bebe.~”

Midoriya blushed, looking down to see the expert job his partner had done in taping up the padding. It was tight and hugged his bottom perfectly. “You really think so?” he asked nervously.

“~ I do, I do! This is truly a magnificent sight and better than I could have ever asked for. There are ways to make it cuter though, come let’s get your full outfit ready!☆~”

From beside him, he grabbed the All Might themed onesie, pulling it over Midoriya’s head and watching his green and black hair poof out the neck hole on the other side. The blonde whistled as he affixed the snaps at the bottom, pressing just a little bit too much into Midoriya’s diaper to tease him as he did so.

Next came the socks that matched the Hero’s golden boots. “~Step in with that adorable footsie please.~” Aoyama said and his boyfriend complied. He was starting to understand that his arousal and interest in the diaper was only part of the whole session for his partner. The blonde wanted to completely infantilize and care for Midoriya while he was in that state.

With complete trust in his partner he was able to slip into the mindset of childishness easily. Without considering why, he popped his thumb into his mouth and hallowed his cheeks to suck on it. With his matching socks on, Aoyama went to turn his attention to the set of mitts that came with the outfit only to see his partner sucking his thumb absentmindedly.

“~Oh my!~” he exclaimed, grabbing instead the pacifier and clip from the ground. He pinned the corded clip to Midoriya’s new onesie and gently pulled his hand out of his mouth, replacing it instead with the rubber nipple of the blue paci.

Midoriya gave him a thankful look with his eyes and suckled away at that instead. “~It seems you’re falling into your role rather easily aren’t you?~” Aoyama asked while pulling rubber yellow mittens over his partner’s hands.

After taking a second to admire his work Aoyama nodded, satisfied with his partner’s transformation. “~Alrighty mon bebe, I’ve got to go get something so be good and crawl around like a good diaper boy for me, yes?~”

Without waiting for a response the blonde rushed out of the room, leaving Midoriya on his own. He was shocked at how easily he’d accepted falling into the role of acting like a baby, especially at Aoyama’s behest, but no part of it felt wrong to him. He felt strangely happy being diapered and all dressed up.

With a creeping smile, he brought himself down onto all fours, exploring the room from his new point of view. "That changing mat Aoyama grabbed came from there." he thought. With a curiosity as to where it'd come from he moved towards the closet he'd seen his partner pull supplies from. A little digging from his low position revealed a large cardboard box hidden under several blankets in the very back.

“What’s this?” Midoriya wondered, pulling it out to the middle of the room to see inside. Opening the box revealed a stash of supplies far greater than he thought Aoyama might have procured. There were diapers and onesies galore, all with different styles and designs. These lined the outer edge of the container while in the center a small assortment of baby toys waited. Simple blocks and stackable plastic toys piled in the center of everything.

With a curious hand, Midoriya grabbed a white and blue rattle, giving it a slight shake as he eyed everything else. “I guess my secret love of diapers wasn’t the only thing being hidden in our relationship,” he thought. He didn’t feel any animosity about it though, seeing as his partner had prepared a gift for him and he got to experience it in all its glory now.

When Aoyama stepped back into the room, a sloshing bottle of milk in his hand he was surprised to see that Midoriya had pulled his box of hidden adult baby from the closet, but glad that the look on his face was not one of anger. Instead, his green eyes twinkled with excitement and wonder like somebody discovering buried treasure.

“~You know,” he said, announcing his presence to his partner from the doorway, “~I put those mittens on you to keep your wandering hands out of trouble, I didn’t think you’d prove them useless so quickly!☆~”

Midoriya blushed at the accusation and shook his newly acquired rattle weakly, wondering what might come next because of his snooping.

Lucky for him Aoyama was a kind caretaker and opted to just feed him the sweet milk he’d prepared for his new baby.

The pair’s exploits into baby play continued for months and now that they’d broken the seal on it they had some discussions about what it’d actually include. Aoyama himself wanted it all: he not only wanted to see Midoriya diapered, but he fully expected him to use the padding. He considered it a waste if the diaper wasn’t soiled–after all, what else was it for? Midoriya however was somewhat perturbed by this, he wasn’t sure about it until Aoyama suggested something to help him along.

“~Let me give you something to try once, I’m willing to bet you’ll like it.~” he suggested.

Midoriya, who trusted his partner, agreed and within minutes was sucking down a bottle of spiked milk to override his inherent potty training. He quickly became nervous when his stomach started to groan and grumble. The pressure and strain built quickly in his abdomen until instinctively, he was rushing to the bathroom to relieve it. Aoyama laughed at his hurried waddle, especially when his partner reached the door to find it locked.

The laxatives and diuretics did their job before he could rip the door away with his quirk. The back of his diaper bulged out and drooped as a relentless push deposited a heavy load into his padding. In the meantime, he flooded the front of his nappy with hot piss all while so close to the sweet bastion of a private bathroom trip. Instead, Aoyama was able to watch and enjoy the show of his boyfriend shaking helplessly and filling his pampers.

To his surprise afterward, Midoriya professed an intense love for the act he not only enjoyed the humiliation of being so dependent on his padding, but he also enjoyed the squishy aftereffect in his pants. Before he could continue, Aoyama tackled him, pushing his partner to the floor and sitting on the still hot, squishy padding. Uncontained lust came out between the two in soft gasps and jolting hip movements in the middle of that hallway till there was a stickiness left in both of their pants.

From that day forward Midoriya’s potty untraining began, a gradual process that both took active participation in. The diapered party (Midoriya) did the hard work of actively choosing to use his diapers instead of the potty while his caretaker (Aoyama) aided him with lots of positive affirmations. He also slipped lots of laxatives and diuretics into his partner’s mushy baby food meals and bottles of warm formula to help his body overcome that pesky toilet training.

Because of this Midoriya had to be diapered 24/7 from that point on, even as the #1 Pro Hero Deku. It was hard to get used to at first. The previous worries that his new bulging diaper could be seen through the tight material of his costume proved to be only a slight problem. In reality, his issue came from the added mass of padding around his waist affecting how he moved. Most of his actions were muscle memory, so adjusting for it took some time for the hero.

Similarly, when he started to have accidents in the middle of fights, he fought the urge to freeze up. With time it eventually began happening more naturally. He’d only notice the lumpy mush pressing against his tush after the accident itself had already happened.

Luckily for him, Aoyama was always eagerly waiting at home for his partner to return so he could provide a change, both into a fresh diaper and into a set of babyish clothes.

Several months after starting the strange journey of babyfying himself, Midoriya trudged back home after a long day. His hero suit thoroughly shredded and dirtied. It’d been a very long day for him and he was thrilled to finally be returning.

Passing the threshold was the last barrier before he started stripping away the heavy gadgets and tattered spandex material. The front door wasn’t even fully closed before he was stepping out of the suit and exposing his saggy yellow-stained diaper to the room.

“Yuga!” he called out as the door clicked shut, “I need a change!”

From around the corner, Aoyama appeared, the same glimmer in his eye that he had whenever Midoriya returned home. He waggled a finger at his diapered partner, tsking. “~Ah ah, That’s not the language we use when we are alone, is it?☆~” he asked playfully.

He blushed, shaking his head nervously, “No… Daddy...” This was something the pair had been working on getting Midoriya more comfortable with as it reinforced the caretaker connection between the two. He watched Aoyama approach with a wide smile on his face, obviously proud of his baby’s progress

The soggy hero was rewarded with a gentle rub against the front of his soggy padding which caused him to shudder and gasp. ‘~Very good, mon bebe.~” Aoyama said breathily in his ear, feeling the growing tightness in the plastic padding’s confines. He pulled away and looked his boyfriend up and down. “~Seems like you’re very dirty today, aren’t  you?~.” he asked.

Midoriya, feeling not only the now cold clamminess of his diaper along with the latent layer of sweat on his body, nodded. He couldn’t wait for a fresh diaper and a clean onesie, but he hoped “Daddy” would suggest one thing first so he wouldn’t have to do it himself.

“~Well then,~” Aoyama said, taking Midoriya’s hand, “~I guess it’s bath time for you eh bebe?☆~

Midoriya nodded excitedly, glad to hear the suggestion. “Yes daddy.” he said happily, squeezing Aoyama’s hand as they walked. However, when a slight pang of pressure alerted him to an impending mess, the fluffy-haired baby stopped and in one smooth motion dropped into a squat.

A slight push was all it took for embarrassing farts to sound out to the room followed by a lewd squelching sound. The back of Midoriya’s diaper quickly darkened and sagged due to the weight of his deposit. A look of pleasurable relief covered his face as the swinging padding lowered little by little, his shameless mess packing his pampers full. In the middle of the process he popped his thumb into his mouth, suckling to add to the babyishness of the experience.

From next to him Aoyama watched on, pleased with the progress of his boyfriend. He’d fully embraced his new little side and the blonde loved it. After several minutes Midoriya’s tightened grip loosened around his hand, signifying he was done filling his diaper like the baby he was. The last few pitiful farts were muffled by the mush and padding taped around his waist.

“~Well well,” Aoyama said, somewhat surprised by the volume of mush weighing down the diaper between his boyfriend’s legs, “~It seems you had to go a good bit. You definitely need a bath now don’t you?☆~”

Midoriya nodded, keeping his thumb in his mouth as he waddled toward the bathroom and the relief of a warm tub.

Aoyama followed behind happily, grabbing the stinky sagging padding and giving his partner’s mushy tush a squeeze. “The number one pro-hero: Deku, really just a big baby. My big baby.” Aoyama thought to himself, happy to see how well his simple request had worked out.