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The first thing Bakugou notices is the smell. Deku smells like sewer. Did the damn nerd forget how to shower? Then, because Bakugou is glaring at him, he notices that Deku is moving sluggishly. Maybe he had a bad night's sleep and woke up late. Shitty Deku couldn't even take care of himself.
A few days later, Bakugou realizes that he hasn't heard Deku mutter in a while. Also, the smell has gotten even worse! What the hell is going on with him? He doesn't participate in class anymore and barely writes anything in that stupid notebook of his. And he's so. Fucking. SLOW!
Bakugou wants to know what's wrong with Deku. But he can't just ask, or the stupid nerd will think he cares. So he turns to google. He starts out by searching 'why doesn't my friend talk anymore', but that doesn't tell him anything useful. He searches a few more things and eventually an answer starts to form. It isn't one that he likes. There's no way Deku is depressed, right? But the more he thinks about it, the more likely it seems.
Deku was quirkless. He had no friends. Their teachers basically told him that he couldn't amount to anything. And then Bakugou had... Bakugou had told him to...
Fuck. Maybe he needed to talk to Deku.
The next day at school, Bakugou watched Deku. He stared and stared, but the nerd never looked at him. Since when did Deku pay him so little attention? But Bakugou already knew the answer to that. Deku hadn't been acting the same since Bakugou said those words to him.
"If you want to be a hero that badly, there's a quick way to do it. Believe that you'll be born with a quirk in your next life and take a swan dive off the roof!"
Bakugou never thought the nerd might actually listen to him. And now his own future was at risk! He'd never get into UA if he was responsible for someone's death. He needed to fix this before it was too late.
At lunch time, Bakugou waited for Deku to leave before following him out of the classroom. Once they were in a mostly empty hall he called out, "Oi, Deku!" His target kept walking. "Don't ignore me, shitty nerd!"
Bakugou quickly caught up with Deku, grabbing his shoulder and forcing him to turn around. Up close, he could see that Deku's skin was unhealthily pale. His eyes were dull. And he somehow smelled even worse, as if dead animals were swimming in sewage.
"Listen, Deku. About what I said before... I didn't mean it. So don't do anything stupid, alright?" Bakugou's words were met with silence. He waited. More silence. His cool officially lost, Bakugou grabbed Deku by the shoulders and shook him. "FUCKING ANSWER ME!" He yelled. Then something unexpected happened. Out of Deku's ear dripped sludge.
"What the-" Bakugou stumbled back as sludge came pouring out of Deku's ears, nose, and mouth. So much sludge, forming a shape that looked vaguely human but mostly blob.
"Look's like the jig's up," the sludge said, once it stopped oozing out of Deku. "Such a shame, that body was good for sneaking around. Nice and plain. Maybe I should try yours next?" Somewhere behind Bakugou a kid screamed. A teacher poked their head out into the hallway to see what was going on. "Uh-oh, guess it's time to go!"
The sludge thing booked it, leaving Bakugou to stare at what it had left behind. Deku's body, lifeless on the floor. Bakugou's fear come to life in a way he had never expected.