"Knockturn Alley," Hermione breathed, and a rush of relief flooded inside of her. At least she didn't end up amongst cavemen or dinosaurs. Time-turner fic. Sirius Black falls behind the veil, the time-turners are destroyed, and a Gryffindor is going to change history.

Hermione uses the Time Turner to go back before the Potter's death, not to change things, but to change the outlook of Sirius's life. She went back for the sake of Harry, the Order and for his salvation. She didn't do it to fall in love