In any school rumors were always bound to fly, whispers in the halls and notes passed as who was dating who, who did what flew around. even a school for the superhero's of tomorrow wasn't immune from such a effect. 
With everyone having the option of getting their own dorm room or staying at home with their parents, it was only natural that almost every student had taken that first step towards freedom and customized his or hers room to fit themselves. 
If fact every student had taken this option but one, and it was him who spewed the most rumor about why. 
With his explosive temper and mood swings everyone thought for sure (and a few dreaded) that Katsuki Bakugo would of jumped at the chance to get away from his mom but in fact he still lived at home even if it meant having her drive drive him to school every morning. 
"I heard it's because he makes explosions in his sleep so his bedroom is prepped for him at home and she wants to get her monies worth." was one rumor. 
"he says it was his choice but the school's worried he'll snap and blast Midoriya in the middle of the night!" was anther. 
"His mothers a were beast and he keeps her from attacking the city." was one of the oddest ones. 
Still as odd as all of those were, nothing would of come close to the true reason.

Sunlight drifted in though his window as Katsuki slowly woke up and rubbed his eyes, yawning and then clicking his tongue as he looked around his room. After having anther awesome night's sleep the young blond bombshell was slowly becoming aware that something was off as he started to get up, then it clicked.
He'd woken up all on his own when mama usually was the one to wake him up. 
Standing up in his crib and ignoring how his diapers were sagging from his over night tinkles and uh-oh's despite the snugness of his care bear sleeper Katsuki looked around his nursery and grabbed the crib bars, his bottom lip trembling. 
"M-Mama? MAMA!?" he whined and sniffled, tears starting to well up in his eyes. "Mama where are you?!?" 
Just before the big crybaby could burst into full on tears and sobbing the door to his nursery opened and there was his Mama, Mitsuki. 
"Shhh sweetie it's ok, Mommies here. Classes don't start till later today remember? I was gonna let you sleep in." She coo'ed gently, apparently not phased by the smell coming off of her cute big baby as she lowered the crib rail and gave him a BIG hug, rubbing his back and patting his squishy diaper, letting him sniffle into the shoulder of her purple night coat she wore over her white nightgown. 
"S-Sorry Mama..just I was calling and you weren't there and..and.." Katsuki whimpered and then pulled back and wiped his eyes on the sleeve of his sleeper. 
"Shhh it's ok. I'm here now, and always will be for my little tough guy." She coo'ed and tickled his chin, making the terror of class 1A coo and gurgle like the big baby he was dressed like. 
"How about we get you out of those stinky diapies and into your daytime diapers and then get some num num's in you." She asked. 
"Kay Mama! Did you see how much I filled them JUST for you?" Katsuki asked, holding her hand and waddling over to a changing table.
"Yup~ my little man makes me LOTS of presents even if he doesn't need his diapers because why?" Mitsuki asked, unbuttoning and helping him out of the sleeper and mentally guessing over how destroyed his diapers were.
"because good boys make their Mama's lots of smelly presents!" Katsuki coo'ed. 
"I'm SO glad you weren't a silly billy like those other kids and moved into a dorm, after all what would I do without my little present maker?" Mitsuki asked and tickled Katsuki's tummy as he laid on his back. 
"Yeah.. I'm glad too!" Katsuki said with big grin, though he wasn't telling the whole truth.

Truthfully when he he heard about the dorms, he'd been excited to move out, to be his own man just like the rest of his friends/victims. He preferred how he could act when he wasn't around her, what he considered his true self but just something about being around his mother made him eager to please, meek and submissive and most of all, a giant freaking baby. 
His mama though hadn't liked the idea and had pointed out how tired and grumpy Katsuki got when he'd go on overnight trips away from her, but had decided to humor him to a degree and put him up in a hotel room just down the block for a night, and she'd pay for him to spend three whole day and nights away from her.Heck, she was even gonna let him wear undies the whole time while he did it! (Katsuki was of course potty trained, but Mitsuki had mentioned off hand when he was 8 she missed changing his diapers and well..)  If he could do that she'd agree to let him go and move into a dorm. 
He hadn't even made it halfway though the first night before he'd called her to come and pick him up, crying about how much he missed her and when she'd gotten there, he'd gone in his pants to proof he wanted to be her little diaper boy.

After that, not only had he turned down his dorm but his room which had been a toddlers before was not a babies, and his old bedtime diapers were his daytime ones and his new nighttime ones..wow. hiding his new plumper butt took some doing in a fashion but with his attuide once he was away from Mama no one really dared to say too much and the last person who had tried to start a rumor had been found with his undies over his head and stuffed upside down in a trash can. 

In clean diapers and a diaper shirt on (to help keep his diapers from snagging, it was a bigger problem then one might think!) Katsuki waddled his way out to the table and stood by his high chair like a good boy, waiting for mama to remove the tray and then help him up into his seat and replacing said tray. 
"So, what does my little present maker want for his nummies?" She asked, tying a bib around Katsuki's neck that declared him the cutest baby ever.
"Hmmmm..." Katsuki looked thoughtful and tapped his chin then broke in a HUGE smile. "Whatever mama thinks is best!" 
"Awww, such a good boy." Mitsuki coo'ed and tapped a finger on his nose. "Some nice bland oatmeal it is, with a ba-ba of apple juice to wash it down. 
Smiling and kissing Katsuki's cheek, she left to go and make the food while Katsuki squirmed and kicked his legs and waited.
Of course he could of asked for anything and Mama would of made it for him, she made it clear that her little guy would want for nothing. But just, Somehow asking for bacon and eggs, or pancakes or the like instead of letting it be HER choice just felt wrong. 
'I can always get a cheeseburger at school anyways.' He thought, though he wasn't looking forward to the oatmeal.
Besides the bland bland taste, the oatmeal had a bad habit of making him have to 'make present' and while they both agreed he could use the potty at school for uh-oh's, it just felt wrong to waste a present. 
Pushing his gloomy thoughts aside he smiled as mama came back in and sat the bowl of oatmeal on the the table, and the ba-ba on his tray and Katsuki giggled.
when she did it THAT way it could only mean ONE thing: Mama was gonna spoon feed him! 

Mitsuki smirked as she saw the delight in Katsuki's face as she made it clear what was gonna happen, and briefly wondered if he would still be this happy when she told him what she planned on doing today. there was a reason she was getting him in maxmin little guy mode today. 
Oh she knew her hold over him was total and complete anyways, he just was putty in her hands but she had also heard about what a little bully her darling baby boy could be at school and decided it was time to do something about that. 
Scooping up a nice sized amount on the spoon she focused on the task at hand and in as sing song voice said "Here comes the airplane, open up the hanger~"
Katsuki opened wide and even though the 'plane' had lots of 'clearance' she SOMEHOW managed to get some of the oatmeal on his chin. 
One feeding and clean up later, Katsuki was lightly scolded for being a messy little guy. 
"I think you got more oatmeal on your bib then in your mouth silly boy!" She teased lightly as she washed his face off with a damp cloth but then saw the look of guilt on his face and quickly added. "But that's ok, mama loves you all the same!" 
"P-Promise?" Katsuki asked, bottom lip trembling. 
"Cross my heart!" Mitsuki said and kissed his forehead. 
"yay!"

After a burping and a diaper check, Katsuki put on his school uniform over his diapers and diaper shirt and checked to make sure that his budge wasn't showing too much as he check himself out in a full body mirror. satisfied, he brushing his teeth and grabbed his backpack and wanted for mama by the door with his sneakers on. 
Mitsuki joined him shortly after having changed into a pair of tight purple pants and a light pink top, with a opened white blouse over it and wearing more makeup then Katsuki expected but he didn't say anything as she grabbed the car keys. 
"Are we all ready to go little guy?" Mitsuki asked.
"Uh-huh!"  Katsuki said, nodding his head up and down.
"Diapers good, teeth brushed, homework all done?" Mitsuki asked anyways.
"Check check and I didn't have any cuz I'ma good student!" Katsuki giggled and puffed out his chest.
"well then, let's get this show on the road." She chuckled and ruffled his hair and Katsuki couldn't help but nuzzle his head into her hand. 
Since they were going to school and not out for a drive they didn't bother taking his customed car seat out of the trunk but just because he wasn't in the car seat didn't mean a little guy like him got to sit up front. 
buckled in by mama on the passengers side in the back so she could see him in the rear view mirror, he watched as the buildings went by as they drove to school, only getting confused when instead of stopping by the entrance like she normally did to drop him off, she pulled in and parked.
"Uh..Mama, what are you doing?" he asked.
"Oh, Did I forget to tell you? I got special permission to come with you to class today, so I can check out the school and see if maybe your ready for the dorms." She said with a chuckle.
"Bu-" Katsuki started to say but was cut off.
"Or that's what I told them.truthfully, I just wanted to spend the day with my little present maker and see how he interacts with his friends." 
"O-Oh. Ok." Katsuki said, a feeling of doom growing in his tummy as mama turned the car off and got out, unbuckling him and helping him out of it, and insisting that they hold hands as she lead him inside. 

Mitsuki wasn't blind and could see the looks they were getting, catching more then a few snickers and lots of semi whispered questions being asked as she had her little man lead her towards his homeroom. Katsuki for his part was blushing a lovely shade of red and it just made her wanna pull him in for a hug but in the hall's that might of made things worse..So she waited till they were safely in class 1A and then pulled him in for a half hug.
"Relax little one, Mama's here." She coo'ed. 
Naturally this got wide eyed stared from the other kids. 
"Ah..Hi Miss Mitsuki." Midoriya said, coming over and bowing. "Didn't expect to see you here today." 
"Oh well you know me, I like to know all the facts. Little Katsuki here is interested in maybe getting a dorm room so I came by to check things over. " She lied and kept a arm around Katsuki. "Isn't that guy little guy?"
"Y-Yes Mama." Katsuki said, unable to keep himself from at least calling her mother or mom.
"Mama?" Ochaco mouthed to Momo who then joined her in a little giggle. 
Tsuyu nudged them both to point out Mitsuki was looking over at them and all three girls waved. 
a weird looking little shorty came up and held out a hand, giving her a little that somehow made Mitsuki feel dirty. "Hi Ma'am, I'm Minta, pleased to meet you. I'm one of Katsuki's best friends!"
"No he's not! Mama that's the perv I told you about!" Katsuki interrupted, pulling away from Mitsuki's side and getting between the two as if to protect her.
"I see. why don't you just go sit down little guy before my knight in stinky armor kicks your butt." Mitsuki said then put a hand over her mouth.
She called him that so often it was a Freudian slip, she had meant to say shining armor and a silence fell over the class. well most of the class say a whimper followed by a whine from Katsuki.
"Mama!" 
"Er..I think you mean, shining Miss Mitsuki." Midoriya said, trying to cover up and move on rubbing the back of his head.
"Oh my god! that's it! that's why his butt is so big! he's in diapers!" a pile of clothes (Tooru of course) exclaimed and stood up, the sleeve of her jacket pointing at them.
"Er..Let's not over react guys.." Midoriya said turning to face the class and holding up his hands, sweat dropping as he tried to defuse the situation.
"Mama why'd you'd do thattt!?" Katsuki whined, NOT helping his case in the least bit and tears were welling up in his eyes.
"it was a mistake sweetie! Honest! don't start crying, be a brave boy for mama." She coo'ed pulling him in for a tight hug. 
"HA! figure his power would be explosions..he already goes boom boom!" Eijirou laughed, hand on his head and wishing he had a camera.
"I-I do not!" Katsuki huffed turning around to yell and stomping a foot. "I just wear for mama! I'm not a stinky baby! I'm not i'm not I'm-" He was shouting now and stomping a foot but stopped short as mama spoke up.
"Little man, what have I told you about telling fibs?" Mitsuki asked. 
Katsuki was crimson and looked like he wanted to argue, wanted to do anything but what he did next..but Mama knew best.
"T-That only bad little boys tell fibs." He said, eyes shut tight. 
"And?" she prodded.
"And bad boys don't get bonding time wiff mama." Katsuki said in a VERY small voice.
"Bonding time?" Denki asked, though he raised his hand first.
"Oh, that's what we call it when I breastfeed him. " Mitsuki said like it was normal. 
And to her it was. he WAS still just her little baby. The class erupted in a mix of laughter and disbelief and one or two students muttering lucky as they were jealous.
"...Yeah there's nothing I can do to save this. sorry Katsuki, I tried." Midoriya said and walked back to his desk.
"Ngggh.. Fanks fer trying De..Midoriya.." Katsuki said, fighting the urge to suck on his thumb.
"Now now, if you'll all settle down, Katsuki will tell you the truth what about he does in his diapers, and then I suppose we can do some bonding if any of you wanna watch."
The class settled down and it was more out of a morbid curiosity to see this unfold then anything else that no one got up to leave.
"I..I make tinkles in my diapies ALL the time..and..boom boom's in my diapers at home because..because.." oh how Katsuki WISHED he wasn't so weak willed, that he could of stopped all of this ages ago before letting his mother get such a hold over him. but most of all, he wished she'd hurry up and bond with me. "I'M MOMMIES GOOD LITTLE PRESENT MAKER!"
He expected the chuckles and cries of d'aw that came, but not the applauds from the class and everyone cheering how brave he was to admit what he really was. 
Mama had gotten the teachers chair (As luck would have it he was running late anyways) and plopping her butt down and working a breast out, she motioned for Katsuki to come over and drink up. 
He had nothing left to lose, and so he did as he was told, he was a good boy after all, and took a seat and latched on.
Closing his eyes and enjoying mommies milk he lost himself in the warmth of her embrace and her rich milk, and such silly thoughts of how was he ever gonna be a superhero when he couldn't grown up mostly left his mind.. except for one.
'I wonder if Midoriya would let me be his sidekick?'

The end