Dean is not getting better. The Mark of Cain has once again taken control and made him into the monster the hunter fears that he is. Once again, Dean is a demon, and he is hunting for Castiel and Sam. The angel knows he will not be able to kill Dean and that he must find him a cure. However, Cas cannot think of anything strong enough that could set Dean free of his unique ailment, but that won't stop him from trying. ***WARNING: This story includes spoilers all the way up to season 10 episode 14-this is a Destiel fic-this fic has some strong language, violence, and implications of sexual activity***