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Izuku Midoriya had been living his dream these past few months. He had been accepted to his dream hero academy, and he was being taught by his idol, All Might. Truly, his life was set, and nothing could ruin it for him. Or at least, that's what he thought until a few weeks ago.
Izuku walked through the halls of U.A., the feeling of the underwear beneath his pants making him a bit uncomfortable and nervous. The crinkling was hardly noticeable to anyone else, but to him, it was all he could hear. Under his pants was a thin, blue pull-up, that he had been made to wear by someone who had become a large part of his life in the last few weeks. He didn't exactly like wearing them, but he didn't really think to object, because this woman had managed to get his mother, Inko Midoriya, to this whole ordeal, and he just wanted his mother to be happy.
"Izuku, there you are!" A voice called out from behind him, causing him to turn around. And that person was the woman who had placed him back into diapers. It was Nemuri Kayama, otherwise known as the Pro Hero and U.A. teacher Midnight. He gave a small smile in response to the woman walking up to him, and waved to her as well.
"H-Hello, Ms. Midnight." Izuku said, stuttering for a moment. Midnight wanted him to call her something else, something far more embarrassing, and he wasn't sure if she wanted him to still call her that at school.
"Hello~ Lunchtime is starting soon, isn't it? Why don't you come eat with me in my office?" Midnight offered with a small smile. Izuku knew that he wouldn't exactly be able to refuse, so he just nodded at the idea. However, at this point, one of Izuku's friends, Ochako Uraraka, also walked up, waving to her friend happily.
"Hey, Deku!" Ochako said excitedly, stopping in front of Izuku. "Do you wanna go to the cafeteria together? I bet we can get a really good table if we hurry!" She said excitedly. Izuku wanted to accept, and almost did, before he realized that he had just made a prior engagement.
"O-Oh, I'd love to, Uraraka-san, but I, uh…" Izuku stuttered out, stopping in his tracks as Midnight suddenly put her arms around him.
"Sorry, Uraraka, but little Izuku here is gonna eat lunch with me today! I've gotta take care of him, after all~" Midnight said, before seemingly realizing something. "Oh, that reminds me!" She said before pulling Izuku's pants open to check his pull-up. This, of course, caused Izuku to blush like mad, but he didn't make any moves to stop her from doing this. Ochako looked confused at this whole ordeal, as evident by her tilting her head.
Once she was satisfied that Izuku was dry, Midnight let go of his pants, and took his hand to lead him away to her office. "Remember, Uraraka…" Midnight said, turning to the girl for a moment. "...some men never grow up, their diapers just get bigger and more expensive." She said before walking away with Izuku. This, of course, only made Ochako even more confused, and she watched Midnight and Izuku walk off before deciding to just stop questioning things and walk off.
Eventually, the two of them made it to Midnight's office, and Izuku went to reach for his lunch, before Midnight stopped him. "Hold on, that's not something a baby like you should be eating." She said, before digging around in her bag and pulling out a small jar of applesauce, along with a tiny, blue plastic spoon. She opened up the jar, scooping up some of the food and holding it out to Izuku. "Open up, sweetie! Time for your yummy food!" She said with an all-too-innocent smile on her face. Izuku blushed again, but knew that he couldn't really object, so he just slowly opened up his mouth, being rewarded with the apple-flavored mush being placed on his tongue. He closed his mouth and swallowed slowly, only to open his mouth once more so he could be fed more applesauce.
Midnight smiled at this, and gladly continued to feed her "baby" the applesauce that she had brought for him. Izuku just ate the food without saying a single word, since that was what babies were supposed to do. Eventually, the food was finished, and there was nothing left in the jar to feed to Izuku. "You're such a good baby, eating all your food~" Midnight then got up and looked out the windows of her office. Once making sure that nobody was going to come in and see them, Midnight reached into a small fridge she had set up in this room for just such an occasion, pulling out a pale blue baby bottle filled with milk. "Now it's time for your drink! Come over here!" Midnight sat down on a nearby chair, patting her lap.
Izuku blushed again, but still sat on her lap. Once he was comfortable, Midnight placed the bottle into Izuku's mouth, and watched as he began to slowly suck on the nipple, getting all the milk out. Midnight hummed a small little tune as she fed the boy, and gently rocked him as well. Of course, Izuku wasn't really about to fall asleep, because he was far too embarrassed to do so. Eventually, the milk was all cleaned out, and the bottle was empty. Midnight picked Izuku up and placed him over her shoulder, patting his back gently to burp him. It didn't take too long for Izuku to give out a small burp, which made him blush even more. But the embarrassment he felt from that was nothing compared to what happened after.
Izuku felt a warmth spreading across the front of his pull-up, along with the familiar hissing sound he had come to know all too well in the past few weeks. Of course, Midnight knew what this sound was too, and pulled down Izuku's pants to see the wetness indicator on his pull-up slowly fading away. She giggled, and pulled Izuku's pants off before pulling another pull-up out of her bag. "Time to get changed, sweetheart~" She said, helping Izuku to stand up before gently pulling the wet pull-up off of his body. She then held open the new pull-up, letting Izuku step into it. She then pulled it up over his crotch with a smile.
"Alright, well, lunch is almost over~" Midnight said as she helped Izuku put his pants back on. "Go back to class, and I'll see you at home, okay?" She said opening the door to her office. Izuku blushed and nodded, walking out and heading back to his class. Midnight smiled as she saw him walk off, and went back to her office to work when he was out of sight.
The school day had come to an end about an hour or so ago, but Midnight was just now starting to go home. All the after-school work that teachers had to do was a bit tedious, but still necessary. And now, she could finally go back to her house. Or rather, Izuku's house, seeing as how she lived with them now so she could take better care of Izuku.
The second she walked in, she was greeted by what might be her favorite sight in the world. Standing there was Izuku, wearing nothing but a large, thick diaper around his waist. Izuku normally just wore pull-ups, but on weekends, he had agreed to wear actual diapers, on Midnight's request. As soon as she saw this, Midnight grinned and ran over to hug Izuku.
"You looks o o o o o o o o ocute!" She said, holding onto Izuku tightly. Izuku gave an embarrassed laugh in response, returning the hug for a moment. However, in the middle of the hug, Midnight suddenly picked up Izuku, carrying him off to his room. "Come on, we gotta get you dressed! You must be super cold wearing nothing but your diaper!" She said. Izuku simply held onto the woman so that he didn't run the risk of falling out of her grasp.
As the two of them made their way to Izuku's room, they walked past Inko, and Midnight stopped for a second to talk with her. "Oh, hey, Inko! Don't mind us, we're just on our way to the baby's room to get him dressed in some cute clothes~" She said, tickling Izuku with one hand. As Izuku squirmed in Midnight's grasp due to the tickling, Inko gave a small smile.
"Yes, I'm sure he'll need to wear something other than his diaper. Oh, before I forget, Kayama-san, I bought a new onesie for Izuku while I was out today. Perhaps you could dress him up in that?" Inko said. "I hung it in his closet, I'm sure you'll see it." Midnight nodded happily, and began walking to Izuku's room once more.
Once they made it into Izuku's room, Midnight dug through the boy's closet, and eventually set her eyes on the new, light blue onesie that Inko had bought for him. She smiled and pulled it off the hangar, setting Izuku down so she could get him dressed. "Alright, arms up so I can put this onesie on you!" Izuku blushed, but lifted his arms up over his head like he was told to. And once he did so, the onesie was placed onto him, and the crotch was snapped shut. Midnight took a step back to admire her handiwork, smiling brightly. "Oh, you look even more adorable now!" She picked up the boy once more, carrying him off to the living room. "Time to go play with your toys!"
Upon entering the living room, the two of them saw Inko standing next to a playpen that she had set up while they were in Izuku's room. "I figured you'd want Izuku to play around for a while, so I set this up for him." Midnight smiled at this, and placed Izuku down into the playpen. Once he was inside, Izuku looked around, seeing a small assortment of toys, such as blocks and rattles. He knew that he was expected to play with this stuff, so he picked up a rattle, shaking it around a little bit. And that little bit was apparently enough to satisfy Midnight, who was already cooing at Izuku. The boy couldn't help but blush again, but his embarrassment would only be heightened by what came next. Midnight seemed to realize that something was missing, and dug around in her bag. Eventually, she pulled out a pacifier, and placed it into Izuku's mouth.
Izuku was surprised by this, of course, but after a few seconds, he began to suck on it slightly, which only made Midnight even happier. At this point, Izuku put down the rattle, and began playing with the blocks instead, sucking on his pacifier the entire time. Midnight found this to be the most adorable sight she had ever seen in her life, so she pulled her phone out of her bag, beginning to take pictures of the sight before her.
Izuku's blush only got worse at the sound of the camera shutter going off, but he kept playing with the blocks anyway, since he didn't really want to risk "ruining this moment" for Midnight. The playtime went on for a long time, and Izuku was starting to get into it despite himself. However, just as he started to enjoy himself, Midnight picked him up once more, beginning to carry him to his room again. Izuku was clearly confused by this, and looked at Midnight with a confused look, unable to say anything due to the pacifier still in his mouth.
"It's nap time now!' She said with a small smile. Izuku looked almost a bit upset by this. He wasn't tired at all, and he was finally starting to have fun with his toys… However, he still couldn't say anything. Midnight laid him down in his bed, tucking him in and giving him a kiss on his forehead. However, as she stood there, waiting for Izuku to go to sleep, she saw the boy simply laying there, staring at her with concerned eyes.
Deciding to take matters into her own hands, Midnight decided to use her Quirk to help Izuku to sleep. Activating her Quirk, a sleep-inducing smell filled the room, and within a few seconds, the effects of it hit Izuku in full force, and he quickly fell fast asleep, sucking on his pacifier slowly as he slept. Midnight couldn't help but squeal in delight at this sight. She gave Izuku one more kiss on his forehead, and then left the room so that he could sleep.
Standing outside the door to her son's room was Inko, who still had a warm smile on her face. "I assume you got Izuku to bed?" She asked. In response, Midnight nodded. "Yeah, it took a little bit of work, but he's fast asleep now."
Inko's smile grew a bit, and she opened the door just a tad to see her adorable son sleeping soundly, the only sound in the room being the sound of Izuku sucking on his pacifier. She giggled a bit at this, and then closed the door again. "Alright, well, let's go sit in the living room and wait for him to wake up." Midnight agreed with this plan, and the two women walked away from the room, going off to bide their time until they could have fun with their baby again.
It was just another day at U.A. High School. Students were buzzing about, trying to get to their next class so they could be educated on the ins and outs of being a hero. And everyone seemed to be going about their business on their own… except for one boy.
This boy was Izuku Midoriya, who was currently being led by the hand to his next class by his teacher, Midnight. Even though he had insisted that he didn't need help finding his next class, since he had been going to this school for some time now, Midnight still decided to help him out, because she didn't want her "baby to get lost".
Luckily for Izuku, most people seemed to be ignoring the two of them, and the fact that he was being led around like a child. At least he could save himself the embarrassment from that… People also seemed to be unable to hear the crinkling of the pull-up underneath his pants, so that was also a plus.
Eventually, him and Midnight made it to the next class, and the woman let go of Izuku's hand, only to pat him on the head. "Now, be good, okay? I'll be back to help you again when this class is over." She said, giving Izuku a kiss on the forehead before walking off. Izuku's face turned red at this, but he walked into his class anyway.
"You know, Izuku…" A voice suddenly came from behind the boy, which caused him to jump up in surprise and turn around. When he did so, he saw that the voice was coming from one of his friends, Tsuyu Asui. "...Midnight seems to be helping you out with a lot of stuff recently. And she kissed you on the forehead before you came in here." The frog girl mused. "If I didn't know any better… I'd say Midnight was almost like a mom to you."
This comment flustered Izuku even more, who made a hasty effort to try and dispel this idea from Tsuyu's head. "W-W-What?! Midnight, my mom?! T-That's crazy, Tsuyu! I-I only have one mom! I-If Midnight was my mom, I don't know what I would do!" He said, stopping himself before he began to ramble too much.
Tsuyu decided not to question this too much, and just let Izuku be. Once he was sure that Tsuyu wasn't going to question him on the matter any more, he breathed a small sigh of relief, and sat down at his seat, trying to focus on the lesson as opposed to how embarrassed he was.
The end of the class came too fast for Izuku, who was still too embarrassed to deal with the fact that Midnight would be holding his hand again and leading him off towards wherever he had to go next. However, he walked out of the classroom anyway, and of course, the second he did so, he saw Midnight already waiting for him there. She smiled and gently grabbed his hand. "So, I know you don't have another class for a while, so I thought we'd go to my office again. It's not lunchtime, but we can still have fun together~" She said as she began to lead Izuku away once more.
It didn't take long for the two of them to reach Midnight's office, and the second they made it in, Midnight led Izuku towards a chair and had him sit down. She then sat down herself, and began to speak. "So, I was thinking that after school today, the two of us, and your mom, of course, could go out for a while. You know, go to the park, go shopping a bit… That kind of stuff." She explained, a smile on her face. Izuku wasn't opposed to the idea, of course, since he went out in public with the two of them quite frequently.
"But this time… Instead of going out as a big kid, I was thinking this time perhaps we'd put you in a stroller. You know, just to make it easier for us to bring you around places." Midnight said, her smile not fading. And that was enough to make Izuku against the idea.
"U-Uh… Go out… in a stroller…? D-Don't you think that might be… A-A little embarrassing…?" Izuku muttered nervously, trying to get Midnight to give up on the idea. "E-Especially since it's the weekend… A-And you know what…" Izuku took a second to clear his throat. "Y-You know what kinds of diapers I wear during the weekends… H-How would we hide that…?"
"Oh, don't worry about that! I'm sure everyone will love to see our cute little baby, in his diapers and all~" Midnight said, giving a dismissive wave of her hand in response to Izuku's question. "I already ran it by Inko, and she's okay with the idea. It took a bit of convincing, but she eventually warmed up to it~"
Izuku couldn't help but blush even more. Not only was this idea embarrassing enough when Midnight proposed it to him, but now his mom had agreed to it as well? At this point, there wasn't really much he could do to try and change Midnight's mind, so he just sighed and acquiesced. "Alright, we can go out if you want." He said. At this point, he felt a familiar feeling in his stomach, and he knew exactly what the feeling meant. "U-Uh… Ms. Midnight…" Midnight raised a hand to stop him suddenly.
"We're alone, Izuku, and you know what I want you to call me when we're alone." She said. Izuku blushed, but nodded. "Right… M-Mommy… I need to go to the bathroom…" He said quietly. Midnight only chuckled at this, and made no move to help Izuku out in this endeavor. "You're wearing that pull-up for a reason, sweetheart. Just go in that, and then I'll change you~"
Izuku, of course, wanted to object, but he knew that Midnight would hear no such thing. So, swallowing his pride, he just stood up from the chair, and began to push his mess into his pull-up. It was warm, and it was disgusting. He didn't like the feeling of the weight in the back of his pull-up at all. Once he was done, Midnight chuckled again, covering her nose. "My, my, you really had to go, didn't you? I don't think pull-ups will be enough for you today if that's the kind of messes you're going to make." She said, reaching into her bag and pulling out a diaper. It wasn't that much thicker than Izuku's current pull-up, but it was far more embarrassing.
Without even being told, Izuku took his pants off so that Midnight could change him. Wasting no time, Midnight pulled the messy pull-up off of Izuku's body, and then laid him down so he could be changed into the diaper. First, she pulled out some baby wipes from her bag, wiping Izuku up thoroughly. Then, she pulled out a small container of baby powder. "W-Wait!" Izuku shouted out suddenly. "I-If you put baby powder on me, w-won't everyone smell it…?" He asked, his voice going quiet. Midnight just shook her head and applied the powder anyway. "True, but it's better than having to explain to everyone how you got a diaper rash." She said. As the final steps, she placed the new diaper under Izuku and taped it up tightly.
Putting his pants back on, Izuku couldn't help but notice that the crinkling of this diaper was a tiny bit louder than his pull-up. However, he didn't try to complain about this, since he knew that Midnight would brush it off anyway. Once the change was done, Midnight smiled and took Izuku's hand once more. "Now, come on. Let's get you to your last class of the day~"
The end of the day had come at last. The moment that Izuku had been dreading. He didn't necessarily want to go home, since he knew what would be waiting for him when he did. However, he didn't really have much of a choice, since as he walked out of the classroom, Midnight was there waiting for him once more. "M-Ms. Midnight…? I thought you had after-school work to do…" Izuku muttered. In response, Midnight shook her head. "Nope, I got all the work I needed done early, so that we could spend as much time together as possible after school today~ So come on, let's get going back to the house~" She said as she took Izuku's hand once more and began to lead him away. Izuku couldn't help but sigh at this. He had hoped that he would be able to relax for just a bit before going through with Midnight's plans, but apparently, he wasn't going to be so lucky.
It didn't take long for the two of them to get back to the house, especially since Midnight was the one who took them home. Waiting for them once they got there was Inko, of course, who had all of Izuku's clothes for the weekend ready and waiting to go. "Oh, hello, you two. You're home early, Kayama-san." Inko said, which caused Midnight to nod. "Yup, I got my work done early so I could come home and get ready to go out even sooner." She said. "All we have to do is get Izuku dressed and ready, and then we can get going."
Since Inko had already brought out the supplies that Midnight needed, she didn't even bother going into Izuku's room to change him. She just grabbed the onesie that Inko had brought out, alongside the thick diaper. She took off Izuku's pants, and laid him down on the ground so she could put him into this new diaper. She took off his old one without hesitation, and taped the new one on. Once she had finished that, she took off the rest of Izuku's uniform, and helped him get into the onesie that Inko had pulled out for him. And once she was done putting it on, she noticed something.
The onesie had a small, fluffy tail on the rear of the onesie, along with a hood that had bunny ears on it. She squealed in excitement, and pulled the hood up over Izuku's messy hair. "Ohhhh, you look absolutely adorable, Izuku!" Midnight squealed again. Inko smiled, and nodded her head in agreement. "Yes, he certainly looks very cute~ I got the stroller you asked for, Kayama-san, so are you ready to head out?" She asked. Midnight smiled and nodded in response, picking up Izuku. "Yup! Once we get Izuku here strapped into the stroller, we can go!" She said. Inko nodded, and went over to her room to get the stroller.
As his mom walked away, Izuku looked down at his outfit with a large blush on his face. He certainly didn't want to go outside dressed like this… It would be completely humiliating! But of course, he knew that neither Midnight nor his mom would listen to him on this point, so he simply tried to swallow his pride and let them take him out in public. Maybe if he was lucky, nobody would recognize him…
Eventually, Inko came out of her room, pushing a rather large blue stroller with her. "Alright, let's put Izuku into his stroller, and get going~" She said. Midnight nodded, and gently placed Izuku into the stroller, strapping him in. She gave him a small kiss on his forehead, then walking behind the stroller and beginning to push it out the door, with Inko close behind. Izuku's face turned red once more, and he tried to prepare himself for what was to come.
Izuku was pushed off towards the nearby park, with his two "mommies" talking about what they planned to do when they got there the entire time. And as soon as they reached the park, the two of them immediately went through with said plans. Picking up Izuku out of his stroller, Midnight carried him over to the nearby slide, and placed him on top, watching him slide down. With a giggle, Midnight went back down, picked Izuku back up, and slid him down again.
This cycle continued on for a few minutes before Izuku was picked up again, but this time carried off towards the sandbox. Once he was placed down onto the sand, Midnight handed him a shovel and a small bucket. Izuku, of course, knew what was expected of him at this point, so he just began to shovel sand into the bucket absentmindedly.
Midnight simply backed away, and sat on a nearby bench next to Inko. "He's so cute, isn't he?" She asked, smiling as she watched Izuku play. Inko nodded, turning her attention to Izuku as well. "Yes, he's very adorable~ I think this was a good idea. Putting Izuku back in diapers and all. I have to admit, I thought the idea was extremely weird when you first proposed it to me, but now, I'm rather enjoying it." Inko said.
Midnight nodded in agreement, not saying anything more as she just watched Izuku play to his heart's content. And Izuku played in the sandbox for a good hour or so. However, just like with his playpen, the second he was actually starting to get into it, he was picked up and placed back into the stroller. He took a few moments to adjust himself into a more comfortable position, before speaking. "S-So, where are we going now?" He asked.
"Well, I wanted to go to the store, but I don't think we have time anymore… So we're just going to head home." Midnight said, beginning to push Izuku's stroller back in the direction of the house. Izuku couldn't help but breathe a sigh of relief at this news, as he didn't want to be out in public anymore. However, his relief didn't last very long, as the second a lull in the conversation occurred, Midnight said a line that quickly rekindled Izuku's embarrassment.
"...We'll just have to go tomorrow~"