You get one year to kill him, brother

Harry Potter - J. K. Rowling
F/M
M/M
G
You get one year to kill him, brother
Characters
Regulus Black, Sirius Black/Remus Lupin, James Potter/Lily Evans Potter, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew, Lily Evans Potter, Marlene McKinnon, Dorcas Meadowes, Marlene McKinnon/Dorcas Meadowes
Tags
Alternate Universe - Vampire Alternate Universe - Muggle Regulus Black is Bad at Feelings Alternate Universe - High School Regulus Black is a Little Shit Sirius Black & James Potter Friendship Werewolf Remus Lupin Protective Sirius Black Jealous Remus Lupin Jealous Regulus Black Peter Pettigrew Being An Asshole Vampire Sirius Black Vampire Regulus Black Adopted Sirius Black Orphan Remus Lupin Good Parents Euphemia Potter and Fleamont Potter
Summary
Regulus can't stand the sight of Sirius being all friendly with humans. He's a disgrace on their reputation as an ancient vampire family. His solution is a simple promise: if Sirius hasn't killed James Potter by the end of the year, he will.But things get a lot more complicated when a new student shows up at their school the day after the police found five dead bodies in the woods.
Note
I just liked the idea of the Black family as vampires and ran with it. The writing is fun, I hope the reading is too.(also, the non-con warning isn't about sex. You'll see what I mean later.)

Chapters