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It had all started with Katsuki’s injury. A broken back. Healing quirks had done what they could, fixed it enough so that Katsuki could walk again, but not so much that he could instantly return to the field, he needed to let his body and mind heal. No hero work, light exercise, nothing much more.
Katsuki was going insane on bedrest, and Eijirou couldn’t blame him, the feisty hero always liked being up and doing something, and that had been taken away from him.
3 months down the track, he’s able to take like walks, they take their dog, Nitro, around the block their apartment is on, and that’s about the extent of the exercise Katsuki can handle.
So of course, the destruction of his rigorous gym routine has also had an effect on his waistline.
In the weeks after the accident, Eijirou was so stressed and nervous about what might happen that they ended up eating take out a lot, and then the sympathy gifts started crawling in.
Chili chocolate cupcakes from Uraraka, hot fudge brownies from Kaminari, donuts from Sato. Eijirou had to keep asking his mom to bake some more of those gooey choc chip cookies that Katsuki loved, and often demolished in one sitting.
Eijirou is sure the blonde hasn’t noticed the gain, because their apartment is still in tact, and if Katsuki had even an inkling that his jeans were getting tight he’d set off a barrage of explosions.
Eijirou has definitely been…encouraging it.
The sight of Katsuki all soft and fluffy has his heart racing.
He potters around the kitchen, getting breakfast ready, it’s a sunday, and sundays have always been for his specialty - choc chip pancakes, but today, he’s topping them with whipped cream.
He knows he shouldn’t, but Katsuki’s going to lose the weight anyway when he gets approval from his doctors to start training and return to the field, so why not enjoy a lax diet - and what it does to his boyfriends hips - while he can.
Katsuki wanders into the kitchen just as Eijirou is plating up, and the red head feels a twitch in his pants when he sees Katsuki’s singlet riding up, unable to fully hide his fleshy, doughy belly.
He’s probably only gained around 20 pounds, a small mound of flesh has totally eaten away at his defined 6 pack, so Eijirou figures, what’s 10 more?
“Smells good” he grunts, as he takes a seat at the kitchen island.
“Did you fuck up the laundry shitty hair? Everything’s smaller” he says, as he takes a bite into his pancakes.
Eijirou hopes he’s not blushing.
“What do you mean?” He asks, scratching the back of his neck.
“You can’t put the washing in dryer on the hot setting dumbass. That’s how everything shrinks”
“Oh, my bad”
Yes, Eijirou can play dumb. And he does it well.
They spend the day lazing around, it’s really Eijirou’s only day off, and just because Katsuki’s out of the field doesn’t mean Eijirou is.
It’s late afternoon when he realises Katsuki’s fallen asleep during their movie, his hand in Eijirou’s mom’s cookie tin. He takes a look, and notices two left.
He’s going to have to get that recipe from her and make them himself, but in the meantime, Eijirou decides he’s going to have fun with this.
It starts with bringing ice cream home after work, simple at first, but as time goes on it gets more decadent - rich chocolate and caramel flavours, with heavy hot fudge, topped with whipped cream and sprinkles.
He gets that cookie recipe from his mom, and makes them the same way she does, but he suspects Katsuki likes them even more because he’s the one making them.
With ice cream each night, and a near infinite supply of sugary, buttery cookies, the further expansion of Katsuki’s waistline is inevitable.
But, Eijirou doesn’t stop there.
He starts going home for his lunch break, bringing take out with him, but also another little gift.
There’s a bakery on the street below Eijirou’s office, so he brings home a bakers dozen.
He doesn’t say anything, just leaves it on the kitchen counter.
He’s running a little experiment.
And when he gets home, half the pastries are gone.
But by lunch the following day, the box is nowhere in sight.
So he brings home another bakers dozen, of chocolate and nutella croissants. When he returns home that night, only 3 remain, but they’re gone by morning, which means Katsuki’s taken to midnight snacking.
Eijirou’s bubbling with excitement by the time he makes it to the bakery.
A week after his experiment started, he knows it’s a full success.
So today, it’s an assortment of donuts he brings home to his boyfriend.
Eijirou peppers his soft round cheeks with kisses, bites at his plump lips.
“You’re in a good mood today” Katsuki smirks.
“I just love you, that’s all”
Katsuki hmphs, and walks towards the kitchen, as Eijirou admires from behind.
It wasn’t just his waistline that was growing, his thighs had thickened up too, and his ass? Well Katsuki’s always had a good ass, but this? It was round, and fleshy, the kind of ass American rappers write about.
They eat their lunch together, their new routine now, and as Eijirou leaves to return to the office, he leaves the box of donuts on the kitchen counter, same place as all his other little gifts had lay.
When he returns that night, not a single donut remains, not even a crumb.
From there, Katsuki balloons.
The 10 pounds Eijirou had secretly hoped for has got to be at least another 20. His stomach is round, always round now, it no longer matters if he’s just had a big meal or not. His shirts ride up, and Eijirou catches him continually try to pull them down. He only ever wears sweatpants, and even the waistband cuts into his flesh.
At this point, he’s got to know he’s getting big, and it’s not the dryer.
But, Katsuki says nothing. He does nothing.
Instead, he eats every last bite of what Eijirou cooks for him, he eats all of his gifts, as well as the cookies he still bakes, and the ice cream he still brings home after work.
Eijirou’s noticed a few added pounds to his own torso, but he had expected that, and he still had quite the active lifestyle. Unlike Katsuki.
Eijirou’s itching to know just how much Katsuki’s put on, but he also knows as soon as he finds out, the fun is over, and Katsuki will put himself back on his strict diet.
So instead, he lets his imagination do the talking, but he just can’t help but imagine, bigger.
So he ups the ante.
He starts making thick shakes, chocolate fudge, heavy cream, two big dollops of peanut butter, chocolate ice cream, all blended together.
Katsuki gets one with breakfast, and another when he’s home during lunch break.
And after just two weeks of that, bigger is what he gets.
Within the fortnight, with the added shakes on top of everything else in his terrible diet, Eijirou guesses Katsuki’s added at least another 10 pounds.
Katsuki’s always been the best at everything he does, Eijirou shouldn’t be shocked that that mindset applied to this too.
When Eijirou walks into his apartment for lunch break, Katsuki stands before him, arms crossed and resting atop his tight, rounded belly.
Eijirou knows he’s just spent about an hour snacking, because he’s bloated. Very bloated.
“Like fucking clockwork” he mutters.
“Babe?” Eijirou asks, feeling his stomach sink.
“What treat did you bring for me today?” He asks, and slinks over to Eijirou, and inspects the box in his hands.
“Cronuts hey? Might have to devour those later” he winks.
“Come on, I wanna show you something” Katsuki says, and takes the food from Eijirou’s hands, and leads him to the bathroom.
A set of scales sits in the middle of the room, and Eijirou’s heart races. He’d been found out.
Katsuki laughs.
“You look a deer caught in headlights. Come on, I know you’re dying to know.”
“Y-you knew?”
“Of course I knew! Dumbass! The moment I got taken out of the field and given the no training order I knew I’d put on a few. What I didn’t expect…” he trails off, and laughs again.
“What I didn’t expect was for you to get so into it. I thought I’d humour you, but I also thought you’d be bored by now”
“Bored? When you look as good as you do?” Eijirou clasps his mouth when he realises he said it out loud.
“Glad you still think I’m hot”
He takes of his shirt and Eijirou admires the red stretch marks dancing across his hips.
He steps on the scales, and Eijirou watches eagerly as the numbers flash on the screen. It settles on 194 pounds.
6 pounds off from 200.
“So how much is all that?”
Katsuki takes a moment before he answers.
“54 pounds”
Eijirou chuckles. 54 pounds in a little under 6 months. Katsuki really was amazing.
“You think I’m gross now?” Katsuki grunts
Eijirou looks at Katsuki, and takes his face into his hands.
“I think you’re as sexy as the day I met you, I think you’re amazing, being able to pack everything away like you have, it’s incredible. I love you. An extra 54 pounds doesn’t change that. Neither would an extra hundred. I love you” Eijirou says, and Katsuki smirks again.
“Good, because 194 is a pretty boring number. Wanna help me take it to 200?”
Wait, had he heard that right? Katsuki wanted to put on more?
Did Katsuki enjoy this, just as much as he did?
Eijirou nods.
They start with the cronuts, Katsuki gets Eijirou to feed him, and it’s an experience, as Katsuki licks the cinnamon sugar from his boyfriend’s fingers.
And they do it more often.
The shakes get double the peanut butter, they add nutella.
Eijirou’s Sunday special choc chip pancakes become an every day occurrence, until they get sick of it and turn to waffles instead.
Katsuki stuffs himself every night, dinner usually consists of heavy, greasy western foods like burgers and pizza, he strains to finish, but every night, there isn’t so much a crumb left in the boxes. So a little over a week later he’s back on the scales.
207 pounds. They had reached the goal. They had surpassed.
“Okay. I set the terms from here. This is fun, but I want to be able to return to field one day, which means this weight is going to have to come off at some point.” Katsuki starts and steps off the scales. Eijirou nods.
“We slow this right down, otherwise it’ll spiral out of control. No more pancakes for breakfast, no more take out for lunch. I cook healthy meals, and just snack on what you bring me. We walk Nitro everyday, and I start and end my day with yoga. You on board?” Eijirou nods again.
He’s a little disappointed they have to slow down, and that the weight will eventually come off, but it is Katsuki’s body and he should decide what he does with it.
“Anything that makes you happy babe” Eijirou smiles and kisses him softly.
“Okay. With that being said, I have a surprise for you”
He’s got a mischievous glint in his eye that Eijirou finds a little unsettling, mostly intriguing though.
Katsuki grabs his hand and leads to the kitchen, he goes to the fridge and pulls out a white box. Inside the box, is a large chocolate mudcake.
“It’s your birthday next week, and now that I’ve discovered this little kink of yours, I’m going to give you an early birthday present.” He starts, and sets the cake onto a plate.
“I’m gonna eat this,” Katsuki starts, and sits at the table, motioning for Eijirou to sit next to him. “In one sitting” He smirks.
Eijirou gulps and scrambles to the chair. And in one sitting it was.
Katsuki had started by cutting the cake into slices, but by slice 6, he grown bored and dug into cake with just his fork.
There’s only a few bites left when he groans and slouches back in his chair. He’s rounded out, his skin is firm and stretched as his shirt slowly inches up his fleshy belly, not able to contain his girth. But he takes a deep breath and powers on, taking the last pieces of cake in stride.
Eijirou’s in awe, how Katsuki had just managed to eat an entire cake in one sitting was beyond him.
It didn’t seem to matter that Eijirou had gotten an early birthday present, because by the time the big day arrives, he’s spoiled even more.
He wakes to an empty bed, and walks into the kitchen, following the rich smell of chocolate.
There were three cooling trays lined up along the bench in their entertainers kitchen, one tray of chocolate cupcakes, red velvet cupcakes and vanilla cupcakes, all topped with white swirls of fluffy icing.
Katsuki potters around the kitchen, wiping his hands on his apron, which is tied above his waist and accentuates his now 70 pound gain.
They’d also finally gotten some more clothes for him, they were still tight fitting, no doubt to drive Eijirou even more crazy, but at least his boyfriend was no longer in a constant state of discomfort with waistbands digging into his belly anymore.
“What’s all this?” Eijirou asks, scratching the back of his head
“Shit for your birthday, dumbass”
“Thanks babe, but I don’t really like sweet things. That’s all you” he smirks, and presses a quick tap to Katsuki’s gut.
“No shit. Who said they were for you?”
Katsuki doesn’t even break eye contact as he reaches for one of the chocolate cupcakes, and takes a bite, and then another, and another, until all that’s left is a dusting of crumbs on his top lip.
“Your job for today, as one of your birthday presents, is to sit your ass down and watch me swell up as I devour each and everyone of these cupcakes.”
And swell up he did.
The way the extra pounds sit on Katsuki’s body were really only noticeable in two places. His ass and his belly. Sure, added layers of flesh settled all over his body, with a few added love handles, but most of the added weight sat in his gut, and as day went on Katsuki was eating more and more cupcakes, and his stomach was bloating more and more to accommodate. His already tight shirt could no longer contain the belly, with a sliver of skin starting to poke out.
Three cupcakes remain by the evening, as Katsuki does the washing up. Eijirou wraps his arms around his boyfriend from behind, kissing his neck and bringing his hands to settle on his bulging midsection, and his fingers are met with the squish of his flesh.
Oh? Had Katsuki not been as full as he thought.
“Got room for more, baby?” Eijirou asks softly.
Katsuki turns in his embrace and glares at his boyfriend.
“You doubting me?” Katsuki taunts, and picks up the last vanilla cupcake, finishing it in three bites as he had done that morning.
Eijirou chuckles.
“No, never”
This was the time Katsuki had said he wanted to slow down, and make progress towards losing the weight, but Eijirou can’t help but notice the scowl on his face when the sturdy hero walks into their apartment treatless for a fifth day in a row.
He pretends to ignore the empty pizza boxes in the trash, or mess of baking utensils in the kitchen.
Katsuki’s latest baking bonanza? Churros.
“I thought good boys got treats” he would huff and pout.
“I thought you liked making your own now”
Katsuki shrugs, as he take a bite of a churro Eijirou didn’t even realise he’d been holding.
So the next night Eijirou brings home a box of donuts, topped with chocolate, caramel, strawberry and white choc, and watches in awe as the blondes packs the entire box of 12 away in a matter of minutes.
Luckily, while Katsuki was scarfing down the donuts, Eijirou was sneaking past with another bakery box, filled with chocolate puff pastry swirls.
The reality of their new situation was, Katsuki’s energy levels had faltered, he’d gotten used to laying on the couch, watching bad tv, and always having a hand in the snack tin.
Eijirou wasn’t complaining, he loved the way the weight settled on Katsuki’s body. How his thighs touched, how his ass rounded out, how soft it made his cheeks, and of course how it gave him that big, plush, doughy belly.
And if Katsuki changed his mind, decided maybe he liked the weight, more than he liked the field, Eijirou would never have to worry about losing him in a brutal, traumatic way again.
Eijirou was starting to think maybe Katsuki was enjoying it. He thinks back to the morning he’d woken to commotion in the kitchen, and upon investigation found a big plate of blueberry jelly sitting on the counter, wobbling the same way Katsuki’s belly always seemed to, how he had watched in awe as Katsuki tucked into the sugar filled treat, how his stomach became rounded and taut with each bite. How he’d still had room for choc fudge brownies topped with whipped cream after.
The truth was, Katsuki’s body had gotten used to eating more, and eating junk, and it showed. They stand in the bathroom, Katsuki on the scale.
The stretch marks had doubled, some a vibrant red, others a deep purple. They litter his underbelly, creep up the sides of his stomach.
“I- I can’t see the number” he mumbles.
As Eijirou continues to take in Katsuki’s growing form, and realises he’s right. Katsuki’s belly now hides even his toes.
Eijirou can’t help but blush.
“Here, let me help”
Eijirou peeks at the number on the scale.
231
Eijirou’s breath catches in his throat. Had Katsuki really managed to gain 24 pounds in a month?
They hadn’t been counting calories, but Eijirou knew with the amount Katsuki ate these days, it was definitely in the realm of possibility.
“Well come on shitty hair. What does it say?”
Eijirou pauses. Does Katsuki really want to know that his total weight gain now stood at more than 90 pounds?
“Dumbass” he seethes.
“231” Eijirou blurts out.
Katsuki pauses, and runs his hands over his body, gripping at his love handles, his muffin top.
“231?” He croaks.
There’s a moment of silence that settles over them, and for the first time in a long time, Eijirou isn’t sure what he’s thinking.
But he definitely wasn’t expecting what Katsuki said next.
“9 pounds away from 240. 100 pounds over my start weight. Wanna help me reach it?”
And that’s when Eijirou knew for sure, Katsuki loved this. The man who’d had a strict diet and workout regiment from before he was even a teen, had been given a license to eat. And eat he would.
They spend the next day mapping out just what Katsuki would eat in a day.
They’d start with Eijirou’s choc chip pancakes, then Katsuki would snack on the batch of cookies Eijirou stole the recipe for - also, how had Eijirou not realised he was baking a batch daily?
Then Eijirou came home with burgers or Pizza and the bakers treats. After Eijirou leaves, he goes for the pastries, and leaves the snacking for a bit, waits for Eijirou to cook dinner, then eats the ice cream he brings home. What had shocked Eijirou is that he gets the nutella and chocolate croissants delivered from the same bakery and hides them, so he has something to midnight snack on.
“Babe, I think the last 9 pounds are gonna pack on by the end of the week. This is insane. I’m impressed”
Katsuki smirks.
“Of course you are. Now fucking feed me”
So they spend the next few days stuffing Katsuki to the brim. Every high calorie meal or snack they can think off is fed to Katsuki. Eijirou is delighted at how packed Katsuki’s belly gets. It’s rounded and shaped like a dome. It’s taut for three days straight. His shirts don’t fit, they never even have the chance to make it past his belly button. It’s a glorious sight, and when it comes time for their weigh in, Eijirou can hardly contain himself. Katsuki’s belly, had begun to sagunder it’s added weight.
“Shitty hair, a little help?”
Eijirou spurned into action, and read the number on the little screen.
240
2 hundred and 40 pounds.
Katsuki had officially gained 100 pounds.
From there, Eijirou thought it would start to slow down. He still bought bakers dozens, but stopped making the shakes. He kept bringing ice cream home, but stopped bringing home burgers.
One more than one occasion, Eijirou’s walked in on Katsuki finishing a tub of ice cream, or shoving a 6th eclair into his already full and bloated stomach.
He started getting more and more into baking, and mastered the meringue. Eijirou has also caught him polishing off a chocolate cheesecake.
He starts resting his belly on the kitchen counters as he waits for his food to cook, to give his back a reprieve.
The gaining may have slowed, with a now lower calorie intake, but the eating never did.
While it’s no longer as fast, the numbers continue to creep up, and when it hits a year since the accident, Katsuki’s weight sits at 266 pounds. In a year, he’d gained 126 pounds.
He also announces his retirement, content to live with boyfriend, and snack on whatever he wanted.