“It’s finally done!” Gojou collapsed backwards onto the tatami mats of his bedroom, having put the final stitches on Marin’s latest cosplay. He glanced over at her after reopening his tired eyes. There was Kitagawa Marin, in all her glory. Her long dyed blonde hair, her beautiful, sparkling eyes with their usual coloured contacts, her beautiful face, her second chin, her wobbling gut, her love handles, her hips so wide they almost forced him off her sofa when they were watching anime at her house together, her quite literally fat ass, her bingo wings almost as wide as his waist…

“Oh my god, it’s amazing, as always! I can’t wait to wear it!” Kitagawa Marin, plus-sized model and cosplayer extraordinaire, beamed at Wakana Gojou in her usual way that made the long hours and late nights all worth it, sitting in her school uniform with the lower half of her buttons undone for comfort. It was the ideal cosplay for her, perfectly tailored to her body… mostly. There was no way anybody but the most trained of eyes could tell that the cosplay was slightly too wide even for her, quite intentionally so.

“Thanks, it was a lot of work. I was right to let it out a few inches too, to take into account the time gap between finishing it and the day of the convention.” Gojou said, the costume’s width taking up the entirety of his work table. “It might be a little loose if you wear it right now.”

“I’ll have to be sure to live up to your expectations!” Marin saluted, biting into the bar of chocolate she’d been working on while watching Gojou work. It was a protein bar and totally healthy, she’d insisted as she went through a day’s worth of calories in a few minutes, a wastebin full of empty wrappers off to her side.

After letting her figure slip once too often and being finally transferred into the plus-size modelling department instead of forcing her onto yet another diet, Gojou had discovered that Marin’s massive appetite had actually been kept mostly in check up to that point, and the floodgates had just been opened. With a few months Marin’s slender, conventionally beautiful figure was a thing of the past, likely to never be seen again unless she suddenly gained self-control. Even more surprisingly was the fact that Gojou found that he didn’t mind. Marin was Marin, whatever size she may be, although it presented some serious logistical issues and increased material costs in scaling up her cosplays, which now ranged from her personal interpretation of her favourite characters, and cosplaying known overweight ones.

Marin was, currently, somewhere between five hundred and seven hundred pounds (“Never ask a lady her weight”, Marin had winked at him and said while he was taking measurements, hiding the fact that she could no longer see her scales’ display past her sagging stream of blubber that was her belly) and a mountain of a woman, feeling like she was as wide as she was tall, and filling Gojou with a sense of concern every time she walked through a doorframe, wondering when she would finally get jammed.

“Oh, that’s right!” Marin seemed to remember after finishing the bar. “Now that you’re done and we’ve got time until the con, I have a present for you?”



Gojou grunted as he pulled himself upright, rubbing his eyes.

“A present? Oh, you don’t need to-” Gojou said as she grinned deviously and held out a card in her puffy hands before him.

“Tadah! I got you a gym membership!” She said proudly, Gojou not quite sure what to make of it.

“Um… thanks? But what for?” He asked cluelessly, biting back the obvious retort that maybe she could use a gym membership.

“I’m getting seriously worried about your fitness, Gojou. Too many late nights sewing isn’t good for you!” She chided him in a way that she hoped came off more as a concerned girlfriend and less as a concerned mother. “You got this done weeks before we need it! It’s my fault for not making you take it easy, so the least I can do is get you back into shape!”



“It’s really not that bad.” He protested, but was quickly shut down by her cute pout.

“You’re doing almost as badly as me in PE, Gojou!” She pointed out, Gojou nearly dead last out of the boys whenever they did any sort of activity. “Come on, it’ll be good for you! And if you get really buff maybe you can cosplay too!”

There was no arguing with Marin and he was quickly forced into shorts and a t-shirt and taken to the gym, which thankfully wasn’t too far away, as Gojou was already realising that the decline of his physical fitness was showing just on the walk there. Maybe Marin had a point, although he felt that it was surreal to be lectured about personal health and fitness by a woman with a BMI off the charts.

“This is the gym I always go to, so I’ll show you around!”



“Kitagawa, you work out?” Gojou said incredulously, getting an unhappy pout from her.

“Of course I do, I’m a model! Didn’t you hear me mentioning it all those times?” She said, and Gojou realised that she probably had, but he hadn’t really internalised it. He’d thought she was referring to doing some basic yoga or something at home, or was just using some sort of euphemism. Marin was dressed the part, wearing tight leggings that he was amazed she could find in her size, as well as a sports bra that showed off a healthy amount of her cleavage. Her belly was left to completely hang out, and it was a testament to Marin’s self-confidence that she seemed entirely unbothered by showing it off. If anything she might have been proud of it, as she’d had quite a lot of success as a plus-sized model since she’d gotten so fat.

“We’ll start you off with the machines, nothing too difficult.” Marin said, directing him over to the various machines Gojou vaguely recognised but couldn’t say much about, feeling a little embarrassed that he was relying entirely on his severely overweight girlfriend’s advice and knowledge. He put aside the embarrassment of being next to her and sat down, following Marin’s instructions of putting it on a lower weight than he thought he could manage. She was right, and even the light ones were quite difficult for somebody as untrained as him, huffing and puffing and feeling strained within a couple of sets.

“That’s a good start, but I just realised I should have shown you how to do them properly first! Technique is important, Gojou, so try to do it like I’m doing them.” Marin decided after watching him struggle, the two trading places as the seat was swallowed by her tremendous ass. Gojou watched as she doubled the weight he was doing, then pushed it out completely effortlessly, as if the weights weren’t there at all.

“Hmm, this is too light, you won’t learn what it really looks like like this.” Marin said after her first couple, adding up the weight to over triple what Gojou had been doing. He was amazed when he saw that she was still doing it nearly effortlessly, but it was finally obvious that there was some resistance to her pushing, and that she was showing visible effort at the end of her set. When she gestured for him to try, Gojou briefly attempted it at her weight, and couldn’t even make it budge.

Marin showed him again a few times on other machines, each showing off that she could easily do exponentially more than he could, which quickly made him realise just how little he could achieve compared to if he worked out regularly. But even then, Marin’s strength was obviously impressive.

“I’m amazed you can lift such heavy weights, Kitagawa.” Gojou said. “How many times a week do you come here again to manage that?”



Marin grinned smugly. “I’m lugging around, like, five hundred pounds of fat every day. It’s like weighted clothing, I’m getting super buff just walking around!”

“I guess that makes sense.” Gojou said, realising that now that it was pointed out, it was obvious that she needed a certain amount of strength just to carry herself. But that still wasn’t enough to shatter his image of a severely overweight person as being severely out of shape as well, and it was obvious “Still, is it really that much?”

“I’m serious! Here, see?” Marin pouted and grabbed Gojou’s hand, pressing it deep into her bloated bicep. She smushed it into her fat, until eventually he hit something hard and large, realising that although it was blanked with a healthy layer of blubber, there was undeniable firm muscle underneath.

“You’re right!” Gojou exclaimed, feeling around shamelessly, and realising that Marin’s arms didn’t quite droop in the way he was used to seeing other obese women’s, as he’d occasionally seen when she was hanging out with other plus-sized women. With a bit of extra weight lifting, Marin had developed some serious muscle. He had a sudden image of Marin if you magically removed all of her fat, estimating that even if she wasn’t overweight, she wouldn’t be skinny and slender like she was before. She’d likely be powerfully built, noticeably thick… Although on the other hand, he just couldn’t see her being enough of a bodybuilder to maintain that muscle were she to slim down, instead taking advantage of her current weight’s advantages.

Although Gojou had been skeptical that she even went to this place at first, it was quickly apparent that nobody was batting an eye at the tremendously obese woman who easily dwarfed even the gym’s other most overweight patrons, and unlike them, had little intention of undoing the damage their diet had done to them. Her chief competitors would, with hard work and dedication, eventually slim down, while there was no amount of hard work and exercise that would counteract the consequences of her eating habits. 

“Alright, next we’re doing some bench presses!” Marin announced, taking him over and placing his back down on the bench. His muscles were already starting to protest, but he couldn’t say no to her and her intended training regime. “It’s normal to only be able to lift the bar at first, so we’ll start with just that!”



Marin took the weights off the side, then stood over him.

“Don’t worry Gojou, I’ll spot you!” She said, but Gojou couldn’t see her expression at all, only her sagging gut. He lifted it, and his pride was repaired a little by the fact that he could manage to lift this, and without too much difficulty. She guided the bar back onto the stand, and he recovered as she decided to step things up.

“That’s great, Gojou! Let’s try adding a little now.” She said, sliding on the circular iron weights as he took a deep breath and slowly but surely lifted it, finding it an extremely difficult step up with only a few extra kilograms added, but doable.

“Ah, Gojou, don’t wobble like that, you might hurt yourself!” Marin said with obvious concern in her voice as the bar slowly rose from the stand, shuffling just a little closer. The bar immediately got heavier, Gojou’s arms screaming as a significant amount of weight was instantly placed onto it. He laid in the shadow of Marin’s gut, which had now been pushed a little too far forward and was placed on the weight themselves, and he was almost too breathless to call out for her to stop.

“Whoops!” Marin caught herself and stepped back, but the pressure was already too much even in just a short period of time, and Gojou’s arms were wobbling like crazy, completely red in the face from having to carry the weight of both the iron and her gut. She reached out carefully and effortlessly lifted the bar off of him, Gojou letting out a huge gasp as his arms flopped to his sides.

“Oh my god, I’m so sorry!” Marin babbled out some apologies as Gojou sat there like a dead fish, arms completely spent.

“Maybe we should do some cardio to finish things off instead.” He said as Marin helped him to his feet, only for her to stop in her tracks. “Um, Kitagawa, what’s wrong?”



“Um, you know what, let’s stop here for today.” She said nervously, sweat suddenly dropping from her forehead when she’d seemed untaxed before.

“Are you sure, I think some jogging would be good, you seemed to want me to build up some stamina.”



“I don’t wanna!” She suddenly protested desperately. “Don’t make me have to set a good example for you as your trainer, Gojou! Running’s hard and it makes my legs hurt and I get all sweaty and I hate it! And I’d have to stretch before and after too, it sucks!”



“Alright, alright, maybe next time.” He quickly apologised to his whining girlfriend. So much for her attempts to show off…

“Cardio aside, that was fun, wasn’t it?” Marin said cheerfully as the two left, although Gojou was on unsteady feet, having been a first-timer put through the wringer like Marin had. He wondered if she had done any weights when she had been skinny, or if her perception had been warped by showing up after she was already fat and having naturally built some muscle as a result. This might have been something that came easily to her as a result, and it was obvious that she had wanted to show off…

“Maybe?” Gojou offered his best answer. “I think my body is about to give out. Maybe we should have done this tomorrow after I’d rested a little…”

Exhaustion was catching up with him, and he was unsteady on his feet.

“If you’re so tired I can carry you home.” Marin said as a joke, but Gojou was tired enough that he took it as a serious offer, and he was seriously tempted.

“That might be nice…” He said honestly, Marin immediately blushing. Wait, was he really going to let her? How could she resist?

“Well, if you insist!” She said with a wobbly, barely contained smile of delight, sweeping him off his feet into a princess carry and insisting on carrying him the whole way home, effortlessly, of course…