Eldritch Nightmares (villain deku AU)

Beginnings

Izuku Midorya was a strange occurence in his world, a quirkless boy who desired to be a hero. When he found out both he and his mother were devastated by his lack of a quirk. But unlike most quirkless people who accepted that they were low on the food chain and just went along with menial tasks and jobs, Izuku dedicated almost all his time to becoming a hero. He studied and took notes to try and become a hero like he always desired. Of course he was bullied for it, especially by his early-childhood friend Katsuki Bakugo and his small posse of quirked friends, well more like lackeys. They would harass him all the way up until the end of junior high, and it just got worse when Katsuki found out that Izuku was applying for UA High just like he was.

-Katsuki's POV-

That damned nerd seriously thinks he's good enough to get into UA? Without a quirk he's lucky if they even let him onto school grounds let alone into the entrance exam! I've almost always hated Izuku, since almost before I can remember. It all started when he found out he didn't have a quirk. He still bugged me even though I was above everyone else and even tried to get all buddy-buddy with me! I constantly threatened him only to be met with even more sickeningly kind actions. Eventually he just started ignoring the damn nerd all day, which was pretty difficult to do considering he never learned how to shut his mouth. He's been following me for ten minutes now just rambling on about how he might be able to get into the hero course since quirkless kids are finally getting allowed in.
"CAN YOU JUST SHUT YOUR TRAP FOR FIVE MINUTES DEKU" I snap at him, my fingertips detonating as my quirk went off subconsciously. He just drew back into himself and that damned notebook of his. Before I could even really think, I snatched the book out of his hands and let out a few explosions. I looked at the book which was now almost completely destroyed and tossed it out the nearest window knowing the nerd would run outside after it.

-Deku's POV-

"That's the third notebook kacchan has destroyed this month." I mumble, mostly to myself as I gather up the scraps of paper into a semi-neat pile. He's gotten more aggressive recently and I don't know why at all. I want to help but I just don't know how to. I realize I'm muttering again, which I have a habit of doing when I'm overthinking or pondering something. I shut my mouth and put the destroyed book into my bag before starting my way home to my apartment.

-a few hours later-

I somehow managed to get myself lost, again. Despite being someone who tries to remember every detail of something I still can't manage to remember my way home. I end up passing under a bridge when suddenly I'm being grabbed by green slime like appendages. I can't understand what it's saying but it feels like I'm suffocating and then it gets worse, I feel the green ooze work it's way into my mouth. It tastes horrid, like vinegar and rotten eggs, I manage to make out the words "hijacking" and "body" which cause me to start panicking even more. Soon my vision starts to darken and I'm about to pass out when I feel what seems to be a punch, then I pass out.