Rivalry (слэш)

This is basically self insert for me. Hope you all are along for the ride. The reader is Male and biologically Male too. There will be eventual smut and some chapters will have trigger warnings. Basically though, the reader is a foreign transfer student part of class 1-A who's from the U.S. along with his best friends. Warning, I use a lot of dark humour, so if that isn't your thing just be warned. Oh yeah, Katsuki is gay.