Archive of Our Own

Of all the relationships you’d been in, you’ve never quite known someone quite like Eijiro Kirishima. 

He was one of the most relentlessly positive and kindhearted people you’d ever known.  He was always going out of his way to support his friends in any way he could, always volunteering to help out, stay later in class to help clean up.  Where he got the energy to be there for everyone and just be an all around joy to hang out with was anyone’s guess.  

But on top of just being an all around great guy, the muscular teen could pack it away like one’s business...

It was part of Kirishima’s regimen.  On top of working hard, he also worked out hard too to maintain his rather impressive muscle mass.  He worked out long and hard and doing so required quite a great deal of energy and calories to burn.

...And as it so happened, Kirishima could pack it away like no one’s business.

“...Wow, you’re really going all out tonight, huh,” you muttered in utter awe, and for good reason.

The table in Kirishima’s dorm room was positively packed to the brim with food.  Hearty, meaty dishes and bulk-hefty protein shakes.  Kirishima, who was dressed in his workout pants, salmon colored T-Shirt and sporting his white bandana, grinned a big, fang-filled grin and pumped his fist out.  “Damn straight!”  He said eagerly, then added, “our next practicals’re in two weeks’n I gotta up my game!  Nothin’ helps get me in the fightin’ spirit like a high intensity workout, dude!”  He then smirked and patted his muscular stomach heartily before rubbing it up and down, then said, “And nothin’ helps with an intense workout like doin’ a bit’uh bulk eatin’ beforehand, ya know?”

“Wouldn’t know, I’ve never done it myself,” you muttered, watching as the bottom of Kirishima’s shirt occasionally peaked up from his rubbing, exposing a sliver of his bare stomach from beneath his shirt. 

You were going to enjoy tonight, sufficed to say...

Then, Kirishima eagerly rubbed his palms together and plopped down atop his seat and said, “Welp!  Time fer one plus ultra manly meal!”  And without another word, Kirishima was off.

You watched as your crimson-haired boyfriend tore into a hearty slab of beef with those lovely fangs of his.  They tore into the beef far more rapidly than an average humans teeth would ever be able to manage, allowing Kirishima to chew up his meals much quicker than anyone else.  His cheeks bulged for a moment as he rather voraciously chomped into his meat, then he dipped his head back and gulped heartily.  Your eyes followed a sizable lump which pushed out from Kirishima’s firm yet slender neck and steadily rippled down his throat and vanished past his broad, muscular chest.  He smacked his lips eagerly then grinned back at you.

“Mph, this ain’t just fer me, dude!  Help yerself!”  He declared, then went right back to stuffing his face. 

You sat next to him and decided to eat a little bit of steak and grilled chicken that Kirishima had whipped up.  After your first bite, yours eyes lit up.  It honestly baffled you how someone like Kirishima could be as surprisingly talented a cook as he was, but he somehow managed.  “O-oh wow, this honestly tastes like something out of a restaurant!”  You told him, clearly eager to express how impressed you were.  “Where’d you learn to cook like this?”

Kirishima smiled and scratched the back of his spiky head and said, “Ah, it’s nothin’.  Sensei’s always tellin’ me that the best meals’re the ones that’cha cook yerself.  And, h-heh, cookin’ from home’s cheaper, so I thought I’d learn while I could.  Wasn’t easy though, my first couple times, I swear I thought I was gonna burn all’uh U.A. down...”  Kirishima shuddered nervously to himself, then managed a nervous smirk.  “...R-Remind me to make some Soba fer Todoroki later...”

You just laughed and shook your head.  This boy was just too adorable sometimes...

It wasn’t long before you finished your meal and were comfortably full.  But Kirishima wasn’t gonna be intent until every last scrap of food was wolfed down his gullet.  He continued to scarf down every single thing he could get his hands on.  As time went on, that concave, muscular stomach of his began to rather noticeably press out, making his shirt appear tighter and tighter as he ate. 

But Kirishima wasn’t slowing down one iota.  When he ate to bulk, he went at it all the way, never once letting up.  He continued wolfing down whatever he could, grunting and huffing in between each hearty, impossibly thick gulp he took.  All the while, that tight-looking stomach of his protruded out even more with every few mouthfuls of meat he swallowed down.

Now, normally, Kirishima never suffered any degree of indigestion or immense fullness since, when he really gorged himself, he used his Quirk to harden his stomach lining to compress and compact more and more food.   However, he found for bulking purposes, eating THAT much just made him lethargic, which, if he did too much, would risk softening him up.  So, when doing a workout binge, he stuffed himself without relying on Hardening.  He could still pack it away like no one’s business, but now, there was a much tighter limit.

A good few plates in, Kirishima leaned back in his seat and huffed, stroking his belly with one hand while the other remained rested on the table.  “Whew, oh man...” Kirishima groaned, rubbing his bloated gut firmly which you could see, looked as if his shirt was just barely concealing it now.  “H-Heh, s’like that eatin’ contest all over again.  I gotta pace myself when I ain’t usin’ my Quirk...” 

As soon as those words left Kirishima’s mouth, they were immediately accompanied by a large belch, one with some serious heft to it.  When it ended, a look of immediate relief wafted over Kirishima’s face as he lulled his head back and huffed deeply with relief.  “Gruoohhh man, PHEW!  S’cuse me, sorry ‘bout that, but MAN, did I need that...” Kirishima said with a deep sigh, patting his belly heartily a few times with relief.  It sounded like he was slapping a watermelon with how bloated and tight his gut was getting.

“Heh, don’t be sorry.  That was a good one,” you remarked, feeling your cheeks grow a touch warm.  Kirishima just smiled back at you with that big, go-happy grin of his.  It should be criminal to be that adorable. 

It wasn’t long before Kirishima was back at it.  He resumed wolfing down as much as he could, steadily clearing out more plates.  And of course, as he ate and ate, that firm belly of his pressed and rounded out more and more.  It was protruding by a little over a foot at this point, hiking up his shirt and exposing a few inches of his firm, smooth bare belly.

You could hear it starting to gurgle deeply in response to the influx of food.  Kirishima grimaced as he ate, but he powered through.  Usually, unless he used his Quirk, that was a sign that the tank was getting a tad bit packed.  Even still, the young close-range fighter kept at it.

He grabbed the shake cup, brought it to his lips, and began to glug down a hearty amount of that thick, frothy and chalky “beverage.”  Every single gulp Kirishima took in was incredibly audible.  You could make out the sound of his throat muscles squelching wetly as they took in such an abundance of immensely thick liquids all at once.  No one liked their protein shakes.  Even the chocolate flavored ones tasted like...well, chalk.  But there was no denying that they got results...in more ways than one.

Not only were they great for bulking up when one was getting ready to shred, but they were incredibly heavy drinks.  With the amount of shake Kirishima was slugging down, his already tight, jam-packed belly swelled out even further, to the point where the bottom of his shirt hovered just atop his bellybutton, making its outline visible from beneath his shirt.  His stomachs gurgling only intensified the more he downed.  Yet, Kirishima just kept at it, breathing heavily through his nose and resting his free hand atop his steadily expanding belly as he chugged, stroking it firmly as if to settle the relentless gurgling emanating from within.

Eventually, he downed about half it, slamming the thick, large plastic cup atop the table.  Kirishima wiped his lips clean with his forearm, looking immensely groggy after that.  He was well past his comfort zone and had since entered the ‘severe risk of food coma’ stage of overindulgence.  Short after, Kirishima let out a really wet and guttural-sounding burp.

“BLaaaAAaAaAaaaarrrrUuuuuh-UUUUUULP!!”

It rolled out of him for a few seconds straight, getting really gurgle-y partway in before having some heft to it towards the end.  But Kirishima didn’t look satisfied, clearly, there was a lot more in there.  He grimaced with discomfort, shook his head for a moment, then slapped that watermelon-sized belly of his, expelling a shorter, but MUCH louder belch right after that.

“BOOOOUUUUUUUURRRRPH!!!!”

There was some real power behind that eruption, as if there was a lot of pressure brewing in Kirishima’s belly and part of it had just been forced out. 

“Nice,” you said with a thumbs up, cheeks burning that much more.

But Kirishima didn’t notice.  Again, the boy rolled his head back and gasped heartily.  “Gruuuh, oh dude...” he groaned in a hoarse fashion, rubbing his aching belly in firm circles.  The poor boy couldn’t eat much at all after that.  He took a break, leaning back in his seat and tenderly ran his hands up and down his burgeoning belly, kneading into its taut surface with his fingers and occasionally burped to try and make more room in his gut.

Now was your time to shine...

You gently removed Kirishima’s hands from atop his stomach, then rested your own atop it.  He immediately shuddered at the feeling, always finding it infinitely more pleasant when it was your hand tending to his belly instead of his own.  You slipped your hand from under his shirt and gently ran your hand up and down the smooth, drum-tight surface of his rounded, painfully bloated stomach.

You didn’t even need to ask if that felt nice, given the way Kirishima huffed and groaned both breathlessly yet pleasurably.  He truly was an adorably open book.  So, you continued massaging that rock-hard, immensely distended stomach of his, kneading into its surface to undo the knots formed in his stomach muscles.

Then, you used chopsticks to hang a strip of beef teriyaki above his face.  “You can do it, Red...go beyond, right?”

In spite his rather groggy state, Kirishima managed a weak but still assuring smile and said, “H-Heh, Plus Ultra...n-now that’s manly motivation, dude...”  Then, Kirishima opened his fang-filled maw and allowed you to feed him that strip.  He clamped those sharp fangs of his over the meat and chewed heartily, before gulping it down and sighing heartily, letting his tongue hang out of his maw as he did so.

You used that opportunity to hang another strip of meat over his maw, for which he obliged.

This routine began to pick up momentum.  You used one hand to continue tenderly caressing Kirishima’s slowly yet steadily expanding belly all over, undoing whatever knots you felt by kneading them away, and feeding him with the other hand.  It helped that your Quirk allowed you to emit reverberation through your fingertips, and when used at its lowest frequency, it did wonders for Kirishima’s unbearably tense stomach. 

More and more, Kirishima packed away, growing increasingly well beyond full by the second.  He huffed and gasped breathlessly and periodically, but continued consuming whatever you fed him.  You could feel that drum-tight, burbling belly of his growing bigger and heavier with every few mouthfuls he gulped down.  His shirt was fully hiked up, exposing the entirety of that big, bloated belly of his.  That rock-hard six-pack was nowhere to be seen.  In its stead was a smooth, immensely distended gut, one that pushed out considerably with flesh so smooth yet tight-feeling, that it had about as little give as his stomach had even in its normally concave, muscular frame.

And much to your delight, it was only getting bigger as you continuously fed Kirishima the remaining contents of the meal. 

Several minutes ticked away, and eventually, all the meat had been scarfed down.  Kirishima himself was now chugging the remainder of that immensely heavy shake while you knelt down to his side and devoted both hands to tenderly rubbing that immensely heavy dome of his.  Your fingers kneaded and pressed all the way up to the crevice that led to his broad chest, all the way down to his much softer, far more tender underbelly.  His throat rippled and squelched loudly with each hearty and thick gulp he took from his shake.  Kirishima’s eyes were clenched shut, as if he was just trying to power through the rest and be done with it.

“Almost there,” you assured him, as he just chugged and chugged.  You watched as his throat bobbed in and out slowly with rather sizable lumps traversing down his gullet with each glug he took in.  He really was pushing himself to go all the way.

Eventually, Kirishima gulped down the very last mouthful of the shake, and flipped the cup over to show that not a single drop was left.  Almost as soon as he placed that cup onto the table, Kirishima’s head lurched forward and he let out a sizable, lengthy belch, one that ran for several seconds straight...

“BrrEEeEeEEEEEEEERRRRrrrrrrrhuuuUUUUUuUUUUUUUUURRRRRR-uuuuuuuuuuuuuuuuuuuuurrrrrrrhhOOOOOOOPH!!!!!!”

It was this especially wet and gurgle-y kind of eruption, one with some heft to it, but Kirishima’s stomach was so filled to the brim with meat and that shake that getting all the air up at once was tricky, even as that burp rolled out of him for close to eight seconds straight!  When it finally ended, Kirishima slumped back in his seat, and groaned miserably, thumping his broad chest a few times.

“Grruuuurrrgh...mph, fuck, dude...I’m stuffed...hur-OooOooOOooorrrruup!!!” Kirishima barely choked out, before another guttural burp rumbled out of his maw. 

He steadily eased himself up from his chair, and hiccuped loudly.  All the contents within that immensely bloated belly of his sloshed heartily, making his gut gurgle and glorp rather intensely.  You helped him over to the bed where he promptly flopped onto his back, groaning and hiccuping again as his large belly jutted out.  It had bloated out to a solid two feet and some change; this big, really tight-looking dome that left Kirishima groaning heavily as it gurgled up a storm.

“Atta boy, you really did, huh,” you remarked, laying down next to Kirishima and once again massaging that achingly bloated gut of his all over.  Your hand traced all around the dead center of it, feeling his warm, taut flesh beneath your fingers as your palm ran across Kirishima’s bellybutton.  You eventually dug your finger into his navel and caressed it from within.  The red-haired boy shuddered with delight at that sensation, but he still looked positively spent.

Kirishima’s belly groaned and bubbled away beneath your palm.  You could actually feel the intensity of his digestive system kicking into overtime as it got to work on such an immense abundance of food now festering away within Kirishima’s immensely rounded stomach.  It was so noisy that it was starting to sound like your Chemistry Class in there.

You gripped Kirishima’s taut, rumbling flesh, and pressed your fingers firmly into Kirishima’s gut.  The young man grimaced for a moment, then a deep gurgle rumbled from his gullet, before he threw his head back and expelled a massive belch.

“BRRRRAAAAAAUUUUUUUURRRRROOOOOORRP!!!!!!”

It wasn’t nearly as long as his last one after finishing up, but it was considerably louder.  “There you go, just get it aaaaaaall out,” you practically sang, before grabbing Kirishima’s bulging belly with both hands and giving it a firm SQUEEZE, resulting in another huge, lengthier belch to erupt from the boys fang-filled maw.

“HOOOOOOOOUUUUUUUUUUUURRRRRRRRRREEEEEEEEERRRUUULLLP!!!!!!!”

When it ended, Kirishima was left panting breathlessly, his heavy, rock-solid gut rising and falling as he tried to catch his breath.  Part of you felt a little bad for abusing the boys’ poor belly like that.  But the other part of you knew he’d feel a lot better after getting all this pressure out.  And more importantly, you just wanted to hear that monster you knew he had brewing inside.

So, you wrapped your arms around that near-beachball-sized belly of his, and practically HUGGED Kirishima’s expanded stomach as hard as you could without making him sick.  The result of which made Kirishima’s cheeks puff out and his eyes go wide.  Then, he threw his head back and unleashed what HAD to be the single most COLOSSAL belch you’d ever heard from him...

“BRRRRUUUUUUUUUUUUURRRRRRRROOOOOOOOOOOOOOOOORRRRR-EEEEEEUUUUUURRRRR-HUUUUUUUUURRRRRRRRRAAAAAAAAAAAAAAUUUUUUUUUUUUURRRRRRLLLP!!!!!!!!!!!!”

It raged out of Kirishima’s gaping maw for what had to be close to twelve seconds straight with enough force behind it to make the bed physically rumble in its wake.  It only got louder the longer it went on, since you were pressing into Kirishima’s belly as he belched, to force as much pressure out at once as you could. 

When it finally ended, Kirishima went cross-eyed then went practically limp like a ragdoll atop his bed, one last airy burp rumbling out of his throat.

“UUUuurrrrrraaAAAAaaaarrrrp!!!

You just laid there, gingerly patting Kirishima’s belly, dislodging a hiccup from the boy as his belly burbled much softer than before, grinning ear to ear.

Kirishima just laid there, too exhausted to even speak besides the occasional burp, hiccup or groan.  He was stuffed to the gills, but had a slightly satisfied look across his face.  Likely, he was proud of himself for even managing to eat this much without his Quirk.  And frankly, you were too, as you laid there, marveling at his big, round belly, caressing its smooth, warm surface in slow, circular motions.

The young man looked amazing no matter what, but you were honestly quite excited for Kirishima’s next intense workout.  With any luck, he’d need an even bigger meal to bulk and burn...