A girl keeps dying at the same point in time, trying to break the cycle and find happiness. She probably won't have much to do with the main characters. The setting is the Marauders' generation, but it starts in sixth year. This is essentially an entirely original story. The first chapter is a prologue, so start reading the main story from chapter two. It begins with the first loop, which goes unnoticed, and will wrap up quickly before the main plot gets underway.
Branching storyline. Lots of male leads. There may be some dark brothers.
Contains pseudo-incest. If that's not your thing, steer clear.
If there's an original character you'd like to see, let me know who, and I'll think about how to write them in.
Theme: For love and tomorrow