When Dean goes to sell his soul at the crossroads to bring Sam back, someone else steps in to negotiate the deal. Cas did get a sign and it sent him off into the past to change things. AU from The Man Who Would be King and All Hell Breaks Loose.
Supernatural - Rated: T - English - Chapters: 53 - Words: 184,265 - Reviews: 1933 - Favs: 3,472 - Follows: 3,402 - Updated: 5/16/2016 - Published: 5/18/2011 - Dean W., Castiel