“Hey, Gojou! Take a look at this!”

Gojou looked up from the books he was sorting on his desk as the bulk that was Kitagawa Marin came waddling his way, once one of the most slender girls he’d ever known now the size of both of the fattest women he’d ever known put together. And it was all his fault, he quietly mused as he glanced past her to the king-sized lunchbox he’d prepared for her, dwarfing that of her original size, which itself had already been visibly larger than any other girl’s in his class. When she was eating like that four to five times a day, it was no wonder she had ballooned to at least five hundred or more pounds, more than quadrupling her original size and weight.

Marin’s hips took up the entire gap between desks, the formerly dainty girl knocking off anything unfortunate enough to be placed on the edges as she confidently squeezed herself and her mighty thighs through, forcing that space to widen if needed. Merely turning around was usually enough to send the arrangement of the room askew, many suspecting that once Marin’s weight went over a certain threshold, they would find themselves spaced ever so slightly further apart to prevent the inevitable.

Marin acted largely unaware of her weight, carrying herself as casually as ever, but consciously or not she was forced by her sheer girth to take her heft into account. Formerly one who could hop onto the corner of a table without much care, when Marin’s ass enveloped the entirety of a desk it became clear that she was careful to evenly spread it out as well as keep her feet firmly planted on the floor, preventing the cheaply produced legs from snapping like a twig.

Perhaps the durability of their old chairs, which creaked and groaned upon a lazy student leaning back on one, was given less credit than it was due given that the running bets on when Marin would come crashing to the ground merely by sitting on one had yet to be cashed out. Some had a newfound respect for the thin wood for not developing a recess in the middle and a curve to the spindly legs, even if just one of her thighs was enough to completely encompass the width of the seat and more flattened out until they bulged out into the aisle next to hear. Others were preoccupied with wondering how she had enough room to actually use the desk for its intended purpose, with how her expansive gut swallowed the front between the twin folds of her desk’s edge. Others wondered how she saw past her breasts in the first place, each like basketballs stuffed under her blouse that held surprising roundness even if their own weight caused them to sag and rest on her tray of a gut.

Even her friends had taken her newfound in stride, shrugging it off as being surprised it hadn’t happened sooner while using Marin’s gut as a convenient pillow. One even complained that she’d been getting worse sleep at home, her own pillow unable to measure up. That particular conversation turned to the topic of a sleepover, with the girl joking that she’d never be able to afford the snacks required. Marin had giggled the most at this and shamelessly agreed, and even with a second or perhaps third chin squashing and wobbling at her laughter, she was just as breathtakingly pretty as ever. Despite her extreme size there was surprisingly little else about her appearance that had changed, from her long blonde hair to her makeup to her coloured contacts, nor had her attitude changed much. No matter what size she was, Marin was Marin.

Such was Gojou’s slightly surreal classroom life with Kitagawa Marin, currently squishing her thigh into his side as she leaned over herself to show him a video on her phone. That squish had activated certain neurons in his head, jolting a stream of consciousness that made him wonder how he had gotten himself into this situation.

“...Isn’t that like, totes adorbs? Like I said, it’s super popular! Let’s do it too, Gojou!”

“Huh? Uh, sure! Whatever you want, Kitagawa.” Gojou mumbled out, having hardly paid attention to Marin’s video, most of his field of view occupied by her pale thighs. To be fair, she had held her phone so close to her chest that it was that or take a peek between the over-stretched buttons of her blouse where one could get tantalising glimpses of her lacy bra, and it took considerable effort to avoid looking at them thanks to their sheer size. His eyes had taken a trip down south as a result, and his eyes had immediately gotten lost in the fields.

“Really? Great! I’ll come over to your place tonight!” Marin turned off her phone before Gojou could figure out exactly what “it” was. Knowing Marin it was probably some other cosplay or an overly specific pose she wanted him to photograph her in, nothing new. It was probably not a big deal…

—

The phrase “no big deal” echoed in his head as he wondered exactly how he had ended up in this situation, standing awkwardly in his underwear while Marin set up her phone on a tripod.

“And you’re, uh, sure that this kind of thing is popular?” Gojou asked, too meek to admit that he had agreed to something without paying attention then let Marin talk him into stripping down to his underwear with the express intent of recording it.

The trend, or so Marin claimed it was, Gojou oblivious to social media in general, was a size comparison of sorts. A man and a woman, or rather a woman and her man, would stand in their underwear next to each other and take each other’s measurements, seeing who was larger in certain areas, and then occasionally do things like lift each other up. If the man was sufficiently built and the girl sufficiently slender he might exceed the woman’s measurements in certain unexpected areas like the chest or thighs, but as far as Gojou could tell the humour and actual measurements were besides the point, and it was just an excuse to look at hot guys and gals in their underwear. And that was all good and well for Marin, but he doubted he fit the definition himself.

“Oh come on Gojou, everybody's doing it! Ev-ery-bo-dy!” She stressed with a wag of her bloated, sausage-like finger. “I’m gonna look like a dinosaur on Insta if I’m not doing it too! Do you want to take responsibility for letting down my followers?”

“I don’t know, this seems more like something you’d do with your boyfriend…” Gojou remarked as Marin whipped around, her body taking a few seconds to stop shaking as she hid her red face. What did he think was the point!? That purity might have been his charm, but come on, get a clue, guy!

Despite how stretched out her body had become, she was remarkably free of the blemishes that usually came with it, as if her body was blessed with beauty that no amount of fat piled on could taint. Her belly flesh was perfectly smooth, without a hint of cellulite or stretch marks, her second chin and cherubic cheeks filling out her face without obscuring her stunning natural beauty. It was a fact that her eagle-eyed managers had spotted when she rolled into work with a pot belly and the beginnings of a second chin after a break, Marin saved from being fired or worse, put on a diet, by the decision to move her to the plus-sized modelling division, something she had dominated with her usual talent.

For better or worse the floodgates had opened since then, Marin losing whatever she might have had resembling restraint until Gojou began to worry that at the rate she was going they might run out of pluses on the sizes they wanted her to model. He too had been busy figuring out how to adapt their cosplay costumes to her new sizes, a mixture of familiar favourites taken to morbidly obese sizes and certain characters who Marin suddenly had the figure to imitate.

Today however, there was to be no such cosplaying or modelling, unless you counted the matching purple bralette and panties she was wearing. And even then, Marin’s gut hung out so far that she could have gone completely naked on her lower half and few would have been able to tell the difference from the front. Gojou might not have been a male model or bodybuilder, but his lean diet left him with a low body fat ratio to contrast Marin’s endless plushness, wondering if that skinniness made him a better fit as her partner than if he’d hit the gym in advance.

Marin had enough body positivity for the two of them fortunately, and was done fiddling with the camera.

“Alright, we’re rolling in sixty seconds! You remember what to do, right?” Marin called, thumping with each step as she wobbled her way over and directed Gojou where to stand. He hoped she picked a wide-angle for it, given how impossible it was for the two to be symmetrically placed side by side. Gojou nodded, glancing at the measuring tape just off screen.

“Um, do you need me to say anything…?”

“It’s fine, I’ll do the talking! If you screw up, we’ll just edit it out!” Marin reassured him. She took a deep breath, then put on her perfect camera face.

“Hi, Marin here, as always!” She smiled and waved, Gojou once again dazzled by her effortlessly bright persona. “Today we’re gonna be taking some measurements and doing a little size comparison, guest starring my helper Gojou! He’s always helping me out, but this is the first time you’re seeing him! Say hi!”

Marin’s expression quickly changed to a more business-like one.

“Hmm, maybe we’ll do a silent opening after all. Maybe with some subtitles? Then you can watch it without headphones…”

“We’re still rolling, Marin!” Gojou whispered.

“Relax, we’ll edit it out! We can do another intro later! In fact, doing the intro last is more common than you’d think!” Marin said casually, then flicked back into her camera face, Gojou doing his best to maintain his least pained smile.

“Gojou always has my perfect measurements, but this’ll be the first time I’ll have his as well!”

“You’re doing narration anyway?” Gojou shook his head.

“With that said, let’s get started!” Main clapped her hands together. “Okay, we’ll jump cut here…”

Gojou grabbed the tape, shuffling back into frame.

“Who do you think will be bigger? Something tells me our viewers might be able to guess!” Marin giggled, grabbing her lowest belly roll and jiggling her flab. “Maybe it’ll be more of a fair fight if we flip things a little… what do you think?”

Marin crouched down and placed her arm next to Gojou’s thigh, which, while thicker than his arms, still paled in comparison to the sheer breadth of her bloated upper arm and even her puffy forearms.

“Let’s get started!” Marin clapped again. Gojou held up the measuring tape, carefully showing it for the camera, then got to work. He started with her arm, reading off the measurement, then her chest, doing his absolute best to not pull it too tight, something he repeated when he started wrapping it around her belly to measure her waist. Marin was so soft that it was easy to pull to sink it into her skin, and so large that the process of measuring her waist was somewhat of an involved process. He completely vanished behind her for a second before doing a full rotation to make it back to the front, nearly running out of tape. It always impressed him, no matter how frequently he had to re-measure her with how she constantly grew.

“Wow, I beat my old record!” She remarked as he finished measuring her thighs, which was a rather positive way to look at it. “Alright Gojou, let’s do you!”

It took all of Gojou’s willpower to keep a straight face as Marin somewhat clumsily measured him, able to constantly feel her chest brush or press against him as she leaned in to take it. Being in his underwear was an even greater source of pressure to keep his own pressure as low as possible… By the time she was done he realised he had been holding his breath for almost a minute, and was starting to become drenched in sweat.

“Well Gojou, at least you’ll always have height!” She cheerfully slapped him on the back after announcing their results, Gojou laughing awkwardly in response. “Now, let’s compare weight! Let’s start with you this time, Gojou!”

Gojou had always been told that you should never ask a woman’s weight, but clearly those who said that had never met somebody with half as much body positivity as Marin. He stepped onto the scale they had brought out, curious himself as to what his current weight was. Unsurprisingly he was very average at an almost perfect one hundred and sixty pounds, while Marin, who was so huge that she hadn’t been able to see her feet in months, needed him to read it for her, cementing her at currently around five hundred and forty six pounds, and counting.

“What a huge surprise it is that I’m heavier than you, Gojou! Isn’t that crazy?” Marin laid on her exaggerated fake shock a little too much. “Alright, time for a test of strength! Try to lift me, Gojou!”

“You didn’t tell me about anything like that!” Gojou complained, certain that he’d pull something if he tried. But Marin seemed earnest as always, and he quickly crumbled under her pleading gaze.

Seeing no way around it, he squared up behind her, inhaling deeply and grabbing her love handles with a meaty slap that caused her to audibly gasp and blush. Gojou was so focused on form that he hardly noticed it even as his hands sunk into her flab, groaning as he dug his heels in and lifted with all his might. But he was to regret not spending enough time at the gym, as no matter how much he huffed and puffed, Marin wouldn’t lift even an inch off the ground. He was eventually forced to give in, red in the face and ready to collapse from all the energy he burnt just in the attempt.

“Well, maybe I was asking a little much.” Marin giggled at the exhausted Gojou. “Why don’t I help you take a load off for a minute?”

Without warning Marin reached over, grabbed him around the waist, and swept him off his feet like it was nothing, effortlessly lifting him high into the air and then putting him into what was nothing short of a princess carry. It made sense, Gojou thought from the slightly mortifying and extremely soft position he was in, Marin had to carry around her own weight twenty four hours a day, and like many severely overweight people, she ended up naturally strong because of it.

“Geez Gojou, you’re so skinny! Even a dainty little girl like me can lift you! Looks like somebody needs to put on some weight!” She laughed, Gojou eventually giving in and laughing at the absurdity as well.

“And that’s all for today! Thanks for watching!” Marin giggled at the camera, waving for a few seconds with Gojou supported by her other arm and shelf of a belly.

“Um, you can let me down now.” Gojou requested, Marin doing so and quickly hiding her face as she went to turn off the camera. God, that was so romantic! She internally squealed, albeit not in the position she would have preferred. Still, she made sure to check to see if Gojou could do it himself first!

“Why don’t we try some other stuff while we’re here and have everything set up?” Marin suggested, Gojou already feeling like he’d had enough time on camera for a lifetime.

“Like what?” He asked, Marin reaching into a bag she’d brought with her and bringing out one of her typically loud t-shirts.

“Trying on each other’s shirts!”

It seemed harmless enough, and Gojou agreed, finding an old shirt for Marin to try, although he had some serious doubts that she’d actually be able to get it on.

For better or worse, he had no such trouble. Gojou found himself standing in front of the camera wearing a girly pink shirt with glittery text over it, falling all the way down to his knees and feeling more like a parachute.

Marin on the other hand was, predictably, having trouble getting his shirt on. With some effort she managed to get her head through, her face bouncing free as she got it past her chins, but getting her arms through the sleeves would be her next challenge. She forced it through with initial success, but once it hit her bicep things started to get extremely over-stretched. Marin forced the last bit through, only for the fabric to rip entirely down the middle of the sleeve, the compressed flesh immediately bulging out in every direction.

“It’s okay! I was going to throw that one out anyway…” Gojou tried to console her, Marin pouting at the content denied by her own body, looking rather deflated as the hem of the shirt barely made it past her over-inflated boobs. As a consolation prize, she had footage of Gojou looking adorable at the very least.

“Being in front of a camera is seriously hard work.” Gojou sighed, sinking down onto his bed, just barely able to keep himself upright. It had been long, awkward, and extremely embarrassing. Would anybody even care that he was there, anyway? Everybody was there for Marin, after all. He was exhausted after all that, and watched Marin end the recording and pull the camera off the tripod, ready to sit down and check the footage. And sit down she did… on him!

A five hundred and forty six pound weight was placed on his lap, thankfully partially absorbed by the mattress and how much of it overflowed around him. Unfortunately, that made her all the more overwhelming to be under.

“H-hey! Kitagawa!” He gasped, a face full of sweet-smelling blonde hair.

“What is it, Gojou? I’m, like, going over the video. Do you wanna help?”

“Are you sure you can’t do it somewhere else?” He huffed.

“But it’s so comfy! Here! This is the best seat in the house.”

“Marin, seriously!”

Why don’t you make me?” She teased, shifting her gigantic ass as if to settle deeper into his lap. Gritting his teeth he sunk his hands into her ass, not caring about the line he had likely just crossed. If he was going to pull this off, he’d need every advantage he could get. But no matter how much he strained, Marin was simply too heavy, and with deep shame in his heart, he finally gave in.

“It was a good try though, you were close!” Marin giggled. The pressure momentarily relieved itself as she lifted herself up, only to be merely turning herself around planting herself back down to face him.

“And this is for all your hard work today.” Marin said softly, leaning in and giving a quick kiss on the lips, Gojou going wide-eyed as her ever so soft lips made contact. She held it for a second, and then jerked back as if a diver going up for air.

“Oh-em-gee, I really did it!” She squealed, pumping her arms in the air. “Gojou! Gojou! Your turn, your turn!”

“Huh? Um, okay!” Gojou was still reeling and closed his eyes, using all of his willpower to lean in. He was shaking in anticipation… too much, in fact, as he veered wildly off target and found his lips pressing against something almost equally soft, as well as his nose, then the rest of his face, as he pressed his lips against her belly, Marin thrusting forward and bouncing him off in an indignant fashion.

“Hey! Gojou! Where do you think you’re aiming!?” Marin whined, even more embarrassed than he was. “Do you think you’re funny? You aren’t on camera right now! Do it properly! Oh my gawd!”