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So Bad, It's Almost Hot by 4_44am
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
10 Oct 2025
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Summary
Katsuki doesn’t know why he’s so fucking bothered by it to begin with. Fuck if he knows why he feels like throwing a goddamn tantrum over the fact that Deku’s got a boyfriend.
Maybe it’s 'cuz Deku was fucking three years old, once upon a time, messing with Katsuki and Eijirou’s shit. Ruining their sandcastles and being an annoying little nuisance. He was forced to watch Deku, 'cuz he was Ei’s baby brother and if Katsuki wanted to hang out with his best friend, like ever, then Deku would just have to be in the fucking corner somewhere, dampening the scene, like the stupid little fuck he was.
Deku’s hardly even sparing a glance at him right now, though, and he hasn’t fucking asked about where Eijirou is, not even once.
“I just—” and Katsuki really is pacing now, fingers tangled in his hair. “You shouldn’t even have a boyfriend right now, Deku. Not at your age."
Alternatively: Katsuki realizes his best friend's annoying kid brother isn't much of an annoying kid anymore. (He's fucked.)