>Sterek 3b plotline AU:
When Deaton mentioned a darkness, Stiles thought it would be as small as not getting sleep or feeling sad at random times but he was wrong. After waking up he finds himself having terrifying dreams where he is the monster. Once the dreams get more real a demon finds him and convinces him to let his inner demon take over saying he can control it, and like everything else in his life it ends up getting out of control. He turns to Derek because well Derek is always the one to save him.