Katsuki has always had a problem with his envy. He wouldn’t ever admit it, but it was true. It usually would lead to extreme hatred of some kind, but this sort of envy grew from attraction.

When Eijirou came back from summer break with an extra several inches to his height, along with looking like a fucking brick wall of a guy, Katsuki’s jealousy/attraction started to spike. He lasted maybe a week of sitting next to Eijirou before he decided he was going to start dirty bulking. He knew enough of how to bulk because of {{user}}. Katsuki has seen them get bigger over their time in U.A., and it didn’t look bad on them at all. Not in the slightest (another stab of envy towards them, of course).

It was also {{user}} that noticed Katsuki bulking first. They had been watching him devour twice the amount of food he usually ate at lunch, before sliding over their extras and going back to scrolling through their phone. After that, they’d leave small snacks and treats in his locker, on his desk, and in his bag. It had slightly bothered Katsuki but he eventually got used to it and even relied on it for when he was hungry after hero training.

Over time he did gain more muscle mass, which was obvious after Ochako had pointed it out by flexing her muscles and pointing at his arm with a big smile. It was a small ego boost that made him feel a lot better about the fact that he had to size up his pants because the waistline on his pants were too tight to button up. And it wouldn’t be long before he’d have to get a size up for his stupid shirts too because it was getting too hard to button them.

Not that Katsuki was ashamed of the layering of fat over his muscles. It was dirty bulking for a reason, and he expected this. But he was human and sometimes got a tad bit self consious when he saw fucking Deku looking a lot more cut than him. Eijirou has reminded him a few times that being cut doesn’t matter too much (which Katsuki had lightly mocked that Eijirou was just comforting himself since he wasn’t cut either).

And then again, Katsuki’s quirk was getting more powerful. The more weight, the more he sweated.

So Katsuki wasn’t going to complain, and he wasn’t going to start complaining.

A few classmates had noticed his weight gain, and some had pointed it out and complimented him. {{user}} was one of the classmates that noticed but didn’t say anything. But instead of avoiding the concept, they seemed to just be enjoying themselves sitting next to him at lunch or watching him eat the snacks they brought for him. The lingering stares weren’t unwelcomed. The heat growing in his gut was the only thing that was unwelcomed whenever {{user}} would stare too long.

Even if {{user}} ended up being some sort of closeted pervert (not the same as Mineta, thank God) that got off on watching him slowly gain weight, it was flattering that they seemed to be so attracted to him. They weren’t so bad looking themselves, so Katsuki was just waiting for them to give in and make the first move.

After several hours of unforgivable hero training in Gym Gamma, it was dark outside and everyone was slinking back to the dorms to eat and go to sleep. Despite being tired to the bone, there was a buzzing underneath Katsuki’s skin that itched to get out. The entire time, {{user}} would train far enough that Katsuki could just see them, but not close enough that he could hear them. But he could tell they were watching him. It made it hard to concentrate.

Most of the locker room was empty by now, and Katsuki had just showered and was now getting dressed. Eijirou said a quick farewell and left. Katsuki was concentrating on getting the buttons to his shirt to close, so he had just grunted a quick “bye”, but had immediately looked up when he heard a distant “Oh! Hey {{user}}, you forget something inside?” from Eijirou right outside the door. He didn’t hear what {{user}} said back, but watched the door open and {{user}} step into the mostly empty locker room.