"Hey Bakugou, what's that scar from?"
"Oh, I don't know, why don't you go mind your own fucking business"
"Geez, what's wrong? You're never this angry"
"Whatever"
---
Au where Bakugou wasn't mean until the villains attacked his home, killed his parents, and replaced them with undercover villains. The "parents" tortured Bakugou and installed a device which kinda changed his personality as it fed off his life force.
When the villains kidnapped Bakugou and the evil bird thing (forgot his name) they took the device out in front of his friends (during the rescue) and absorbed the life force that was collected throughout his life.
The heroes eventually are able to save Bakugou (and the evil bird thingy), but All Might is forced into the hospital for recovery, and Bakugou is admitted into the emergency room in a comatose situation.
Basically, Bakugou being super shy and adorable, Kirishima crushing hard, and angst.