Blind Faith: A Destiel Fanfiction

It has been a year since Dean died, and Castiel can't stop thinking about him. The angels grow concerned for their brother as he goes back down to Earth, living with Sam Winchester. Everything changes when an unusual angel comes to visit to bargain for Dean's life back. Will Sam and Cas be smart enough to say no, or will they cave in to temptation? Rated M for language and smut.