Curse of the Black Family Rose

What if the prophecy in the department of mysteries was about Sirius, not Harry? What if Hermione finds an ancient box in the Black family's possession that curses her and ties her fate irrevocably to Sirius? When forced into making a decision, will Sirius do the right thing or act recklessly? Dark Sirius. Eventual M. Dumbledore bashing. Violence. Romance. Battle scenes. REWRITTEN