Play It Again by metisket(Witch-stiles)
Summary: In which Stiles goes along with one of Derek’s plans and ends up in an alternate universe as a result. He should’ve known better. He did know better, actually, and that means he has no one to blame but himself.Laura wants to lure the kid in with food and kindness and make a pet of him, like a feral cat. Derek wants to have him arrested for stalking. They’re at an impasse. (And the rest of the family is staying emphatically out of it in a way that suggests bets have been placed.)”
Why I'm reccing this fic: This my favorite of alt travel fic, totally awesome.