everything's crossposted on both ao3 and fanfiction.net, if you'd rather read there
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Stories by angstea
Honeymouth
In which Hitoshi Shinsou is reincarnated as Hitoshi Kamado, and is the moon to Tanjiro Kamado's sun.
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Naru...
Bakashi-sensei
In which Kakashi reacts poorly to a nickname, one thing leads to another, and suddenly traumatic experiences...
Supernova
In which Katsuki replaces Sasuke Uchiha after the Massacre, and he is not okay (but these dumbass shinobi are...