This is a sumo K.aito AU inspired by @heftyabyssofsweets artwork. I just wanna give them the credit for the art that inspired me and credit to the anon who requested the artwork too. I never even thought of K.aito being a sumo but I just absolutely love the prompt! He is one of my most favourite characters. So naturally I have to write fat fics of him.
I just had to do another one of these because they’re so much fun! I’m just reimagining everything that happened in the game with this AU and honestly, the results are quite cute. There’s so much s.aimota fluff here!
Being the ultimate sumo means you have to eat a lot. That would be obvious to anyone, but even so, it’s nothing like S.huichi would have imagined. Sure, he has seen K.aito eat before but it was only now that it occurred to him how much he ate.
K.aito has made it a habit of his to wake S.huichi each morning and invite him out for breakfast. The detective loses track of time and would often sleep in late or forget to come out from the shell that has become his dorm. This has actually been good for S.huichi, without K.aito he would have spiralled into despair by now. Sitting by his side and sharing a meal has become a rather pleasant routine for him.
Although, when K.aito first insisted for him to sit by him, it was rather awkward. It had only been the very next morning since the first trial. The very night when K.aede died. The very night him and K.aito fought.
That morning, S.huichi was hiding in his room, his thoughts spiralling out of control. This night had been the hardest for him. He didn’t know what to do, so he laid in bed hopelessly, wishing he could just disappear. Suddenly though, a series of loud ringing knocked him back into reality.
Still so exhausted by all the intense emotions, S.huichi hobbled his way over and opened up the door. He had hoped it hadn’t been too obvious that he was crying. When he opened the door he was shocked to see it was K.aito. The man who punched him only last night. S.huichi instinctively gasped as he peered up at him, he was the last man he was expecting to see.
K.aito heard his gasp and assumed it was because he had become fearful of him, which both annoyed and upset K.aito. He was annoyed with S.huichi for not fighting back and being so cowardly. That behaviour will simply get him hurt in this place. The reason why he was so upset though was the intense guilt. The truth was, it has been eating at him all night. He felt ashamed for lashing out at him. That would be the last thing K.aede had wanted. It took a lot of courage for him to come and find S.huichi but now that he was here, he was getting nervous. “I-it’s okay.” He held up his pudgy hands to try and ease the anxious detective. For a moment, K.aito looked down sadly as he recalled the conversation back at the kitchen. Everyone was concerned about S.huichi’s whereabouts and they all knew that he must be grieving. K.aito insisted on going as he knew he had to try and fix things with him. He needed to make sure he was okay.
The detective kept the door open only a crack, still too anxious to face K.aito or anybody at this point. He remained silent as he looked down. “We’re all gathered around to have some breakfast at the dining hall and… I noticed you were the only one who wasn’t there.”
S.huichi had completely forgotten all about breakfast. He was so lost in all those complex emotions that he forgot he needed to eat entirely. “A-ah… right… I guess it’s not unusual for me to forget to eat breakfast.” He smiled awkwardly but his eyes still didn’t meet K.aito’s.
K.aito titled his head to the side like a confused dog. “Huh? Then what do you eat first thing in the morning?”
S.huichi cleared his throat a bit, even before all of this he struggled with his depression. He struggled to take proper care of himself sometimes as a result. “Erm… nothing much, really.” He didn’t realise how he was slowly closing the door on K.aito, it was as if it was instinctual.
K.aito shook his head at this, more annoyed than ever that S.huichi wasn’t giving himself the proper care he needed. “Geez… I can’t even imagine not having breakfast. Well, look. From now on you’re having breakfast with me every day! Got that?” He sounded so intimidating yet friendly at the same time, it made for a strange combination. K.aito grabbed onto S.huichi’s door and forced it open with ease, startling the detective a bit.
S.huichi squeaked a bit as he stared up at K.aito with wide eyes, he never failed to surprise him. K.aito just held onto the door firmly as he stared down at him, feeling another wave of guilt hit him as he saw that startled look in his eyes. “B-by the way…” K.aito started off, he was never good with this sort of thing. With his recklessness K.aito rarely apologies for anything he may say or do but this time, he felt he had to. “I-I’m sorry I slugged ya last night…”
S.huichi was a bit surprised to get an apology. He awkwardly held onto his arm as he kept his head down low, his body tense. “I-I-it’s okay…”
K.aito swallowed hard, still guilty. Regardless, he didn’t know what else to say or do at the time. “O-okay… cool.” He awkwardly waddled off, S.huichi just stood there staring at him. “Hey, you coming?”
S.huichi nodded his head. “Ah! Yeah. Hang on, let me just get my… actually… never mind… I don’t need that anymore.”
The two headed over to the kitchen, things were awkward and tense momentarily. The two struggled to so much as sneak glances at each other, unsure how to handle their complex emotions.
Needless to say, everyone was quite surprised to see S.huichi without his hat. K.aito had felt so guilty and kept avoiding his gaze that he didn’t even realise it. When it was first mentioned he finally stared at S.huichi properly this time, taking in all of his features. He wasn’t expecting for him to have such a cute little cowlick hidden under that hat.
The morning felt… tense and awkward, like everyone was trying to be friendly and casual despite what had happened. It was like everyone was trying to forget last night’s traumatic experience. K.aito waddled over to the dining table, where K.irumi had prepared plenty of delicious meals for them, extra for K.aito of course.
Instead of a chair for K.aito, he got an iron bench with pillows on it, to help support his weight. He had made the mistake of sitting in one of those chairs and it did not last long at all. K.aito’s giant belly smacked down on top of the table, taking up a lot of space. Luckily K.irumi had foreseen this happening and had all the dishes moved carefully around his girth. “Man this looks good! Thank K.irumi!”
The maid simply smiled sweetly at him, she was more than happy to serve him. “It is my pleasure.”
S.huichi stared down at the banquet in amazement, he had never seen so much food in one place before. K.aito then patted at the seat next to him, his whole body wobbling from the motion. “Come sit with me, S.huichi.” He was trying so hard to put up an effort. He wanted so desperately to make things right with him, despite how tense and awkward it may be at first. S.huichi was a bit surprised by this grand invitation but he headed over there regardless.
As he sat down though, he can feel the side of K.aito’s belly ooze against him. S.huichi squeaked a bit as he first felt it. K.aito heard him and glanced down at him, wondering what the strange little noise was about. “What’s wrong? Everything okay?”
The detective nodded his head, blushing slightly as he kept his mouth glued shut.
The ever mischievous K.okichi sat down opposite of K.aito, grinning ear to ear like a mad man. “Wow, K.aito! You take up so much space!” His voice was teasing as he slapped both his hands into K.aito’s giant blob of a stomach. It wobbled and rippled over the table, making the table shake and creak underneath him.
K.aito’s chubby face immediately went bright red as he stares down at his massive body. “S-Shut up! Being this big means I’m extra strong! Strong enough to crush you easily!”
K.okichi simply stuck his tongue out at K.aito, unable to resist teasing him further. “Oh, I’m so scared!”
K.aito growled angrily at him as he glared daggers. S.huichi was unsure what to do in this situation, so he tried to give K.aito a light pat on his belly to somehow calm him down. “Ah, K.aito, it’s alright. Just ignore him.”
His hand sunk in deeply into his soft fat, surprising him a little. K.aito looked down towards S.huichi and then to where his hand was, blushing still. Poor S.huichi quickly pulled his hand back, his whole face red as well. “A-ah! Sorry! Sorry.”
Hating how he continued to be so submissive, K.aito simply scoffed a bit as he crossed his arms, or at least tried to. His thick arms got lost under his giant moobs, which looked bigger than ever as they rest over his arms. “Quit apologising so much. I don’t even know what you’re apologising for half the time.” He grumbled a bit, frustrated by how seemingly weak S.huichi was. Especially given how someone like K.okichi was here. He knew that someone like S.huichi can easily fall into the clutches of someone with malicious intent. He hated that idea.
S.huichi nodded his head awkwardly. Everyone began to eat as they had a conversation. S.huichi couldn’t help but stare at K.aito as he eats. He stuffed himself as if he was never going to eat again. From where he sat, the detective can hear his massive belly gurgling loudly. It was hard to pretend that everything was normal. At least this… awkward situation somehow took his mind off of last night, even if only for a moment.
K.aito slurped up some noodles, the giant bowl rested on his plush belly. The detective didn’t eat much, but he didn’t have much of an appetite to begin with. K.aito asked a few times if he was going to eat his food, probably wondering if he can take it. This enabled S.huichi to focus on eating some more, as he knew the greedy K.aito would consume everything.
All was well for a moment, until, K.okichi had ruined it by bringing up the killing game again. Everyone went tense and silent and K.aito immediately took the bait and began to scold him. So very furious, K.aito stood up from the table, looming in towards K.okichi. His belly pressed into the table more and more.
S.huichi worried for a moment and tried to gently tug at K.aito’s mawashi. “K-K.aito, calm down.”
Still so furious, the ultimate sumo slapped S.huichi’s hand away.
So in the end, S.huichi just had to sit and listen to the two bicker again.
This was a few days from now. Now, he and K.aito were closer than ever before. Every breakfast with him simply felt like pure bliss. The morning after their first training session, S.huichi actually allowed himself to get more comfortable sitting next to K.aito. K.aito himself seemed more affectionate than ever. As S.huichi sat down next to him, K.aito grinned and playfully pulled him in closer to his body. Smothering him against the side of his belly. “Hey, bro! Sleep well after training?”
S.huichi squeaked a bit, blushing madly as he felt himself sink into K.aito’s huge body. “Y-yes. M-much better than I have in… weeks, honestly.”
K.aito continued to grin as he gave him one final squeeze. “Ha! Good!” Everyone continued to stuff themselves, all until everyone else was full and they all left. K.aito still had so much to go through though and S.huichi was not willing to leave him. He watched in amazement as K.aito continued to eat. “Mmm! BURP! Thanks for keeping me company, sidekick.”
The detective smiled a bit as he gazed up at the giant of a man. “It’s no problem, really.” As K.aito munches away, S.huichi’s eyes found themselves drifting towards his wobbly belly on the table. He wanted to touch it, so very desperately but he was just as quick to diminish the thought once it came in. Suddenly, another loud burp escaped from K.aito’s lips. “BUUUURRRPPPP!!! H-hey… huff… sidekick. Hand me those pancakes over there.”
This was it, S.huichi’s second order as his sidekick. He was quick to obey as he rose from his seat and rushed towards the plate with the stack of nine pancakes. Swift as a rabbit, he hurriedly brought the pancakes over. K.aito eagerly reached out towards the plate, looking as adorable and cuddly as ever as he did. The sumo sat the plate on top of his giant belly, only to frown a bit as he stares at them. “Eh, not enough syrup. S.huichi, get me some!”
The detective nodded his head, somehow he became more like the ultimate maid now. Or perhaps… the ultimate feeder to be exact. Either way, he obeyed K.aito’s every command. “Right.” He looked to where the syrup was and grabbed it, without thinking of simply handing it to K.aito, he began to pour the syrup onto the stack himself. K.aito licks his lips eagerly as he watched. S.huichi however had accidentally spilled a little bit of the syrup onto K.aito’s massive belly. “A-ah! Sorry.” He blushes madly and bit down on his lip as he stares.
K.aito looked down at the smudge on him and simply shrugged. “It’s fine.” He wiped a pudgy finger across the golden goo that rested on his fat tummy and put it into his mouth. He suckled on it loudly, unaware of how it was driving S.huichi crazy. He then proceeded to devour the pancakes, getting more bits of sticky syrup on him as a result. S.huichi just couldn’t help but stare and blush. He listened to K.aito moan at the amazing taste, he listened to the way his stuffed belly gurgled and sloshed onto the table. He felt as if he may pass out at this rate… taking in such a sight.
K.aito made short work of those pancakes, now licking the plate clean. He burped again, louder than ever. It echoed throughout the whole kitchen. “BUUUUUUUUUUURRRRRRRPPPP!!!” K.aito then huffed a bit as he slapped a hand over his belly, making it wobble and slosh some more. S.huichi blushes more and more as he kept on staring, he tried to tell himself to stop staring but it was honestly so hard.
As if to make things harder for him, K.aito began to rub both of his hands down his stuffed belly, moaning softly as the gut gurgled loudly. “Mmm… damn… so full… huff… ah…” he tilted his head back, trying his best to rub as much of his belly as possible. “Mmmgh… I think that’s gotta be the most I’ve ever- BURRRRP! Eaten…”
Poor S.huichi felt as though he may melt as he listens to him saying this, though he had no idea how much harder it was about to get for him. “Sidekick…” K.aito practically moaned out his nickname for him. S.huichi peered over at him curiously. “Gah…. Imma need ya… to… huff…. Rub my belly for me.”
S.huichi dropped the syrup he was still holding onto, blushing harder than he ever has before. “W-w-what?!”
K.aito burped again as he rubbed his groaning belly. “Rub my belly! It will help… huff… digestion…”
Poor S.huichi awkwardly walks his way over to K.aito, who was practically panting as his belly worked hard to digest everything. S.huichi hesitantly places both hands over his planet sized gut. Kaito moans immediately as he felt his hands. S.huichi blushes hard as he began to rub it, the soft motion was still enough to make it slosh against the table. “Mmm~ hah… damn, that’s good…” K.aito says with a purr.
S.huichi simply kept quiet as he kept on rubbing the belly, trying to silence the screaming voices in his head. ‘So soft! It’s so soft and jiggly! How can it still be so soft when he is stuffed to the rim?’ He started with circular motions before allowing his hands to wonder down lower, massaging the belly all over. Now getting a little experimental, S.huichi held onto the lower half of his belly and rubbed his thumbs in a circular motion. This caused the sumo to shiver, making the belly jiggle even more into S.huichi’s delicate hands. ‘This is… actually oddly satisfying…’ S.huichi thought as he continued to rub at it. ‘It’s almost like… a giant stress ball.’
K.aito moaned some more, sounds that were driving S.huichi crazy. “Damn… you’re so good at this…” he closed his eyes, which signalled that he was relaxed. “Hah… I’m gonna need a good long nap after this…” K.aito slowly began to rub his belly too, in spots where S.huichi couldn’t quite reach. It growled loudly as the two continued to work at it.
The small timid detective continued to do his best at rubbing the large stomach, now finally calming down enough to enjoy this. His skin felt so soft and smooth. Being able to touch it like this was…soothing. Just what he needed after all the stress.
Suddenly, some soft snoring could be heard. S.huichi tried his best not to giggle as he did not want to wake his friend. As K.aito drifted into a deeper sleep though, he suddenly slumped backwards and fell out of his seat. “K.AITO!” S.huichi cried out, worried for him.
The sumo fell with a loud thud but all his padding kept him perfectly safe. His belly wobbles around endlessly from the impact. K.aito snapped awake, his purple eyes try to spot S.huichi but he couldn’t see anything past his belly. Luckily, his loyal sidekick came running over quickly to make sure he was unharmed. Although that bottle of syrup he had formally dropped to the floor came back to haunt him. S.huichi slipped right over and face planted into K.aito’s massive belly, bouncing around a fair bit before slowly settling in. It was a trampoline like effect. The large giant of a man hiccups and burps again as he watched his far smaller friend bounce on him, blushing slightly as his massive belly wobbled around him endlessly. “Mmmgh! URP! Hic.”
S.huichi himself blushes heavily as he slowly looks over at K.aito. The moment their eyes met, he panicked and quickly pulled away from his soft body. “AH! S-s-sorry! I’m so sorry!”
The stuffed sumo moans softly as he rubbed his belly again, which still jiggled ever so slightly due to the impact. “Mmm… it’s fine. Heh… at least you had a soft landing though. Am I right?” K.aito chuckled a bit, but it wasn’t his usual loud laugh. It was softer, like the effects of being so full were getting to him.
His little joke only further flustered the detective, who quickly looked down at the floor instead of his eyes. His whole face was red.
Now falling into a food coma, K.aito yawns and stretches as he sat up. “Mmm… alright, time to sleep all this off.” He gave his belly another little rub, it gurgled softly under his touch. He struggled a bit to get up, grunting a bit as his massive meal tried to hold him down. S.huichi noticed this and despite being flustered, he did want to be useful. He moved over and helped K.aito up. The sumo had one meaty arm around the detective’s slender shoulders. “Thanks. Knew I picked a good sidekick.” He ruffled his hair a bit, the motion made his body wobble some more. S.huichi instinctively had his hand over his massive belly, he can feel it jiggling under his palm.
He then proceeded to help his stuffed friend back to his dorm, taking the time to enjoy every moment of it. He felt so warm and soft, everything he needed. K.aito hiccuped a bit again, causing his belly to slosh. S.huichi can feel it all and couldn’t stop himself from enjoying it deep down. He blushes heavily as he leaned into K.aito’s comforting body.
By the time they finally made it back, K.aito entered his dorm where he will take a nap. S.huichi couldn’t help but wonder if he may grow any bigger while they were stuck here. The mere thought of it got him all flustered.
