purrlin-blog:

AU: On the way to picking up Scott to bring them both to the rave, Stiles is possessed by a demon named Malphas in his moment of emotional weakness. And instead of being possessed by Peter, Lydia is possessed by a demon named Jezebeth. The two are old lovers who, once again united and human again (or wearing human skin, anyway), decide to throw a housewarming/welcome back party for themselves. Their guests - comprised of Derek’s pack, Jackson and Scott - are all unaware of just who or what they’re really talking to, though, and the fact that they’re part of the party games.