Derek's fourth Chase will be his last if he doesn't catch an omega this time. He's starting to doubt this whole soul-mate thing anyway, at least until someone from his past shows up and gives him the run of his life.

AU from 1x04, "Magic Bullet." "Why the hell did you do that?" Derek demanded. "Why would you bond with me? You were going to leave me for dead, you didn't want anything to do with helping me." "Okay, first of all, that was like two hours ago and I've grown a lot as a person since then," Stiles said.