Dean and Castiel

Dean and Castiel have working relationship, as well as a mutual respect for each other. Dean begins to see Castiel as part of the family as their relationship goes on. Castiel respects Dean and helps him whenever he can.

Background
When Dean was in hell, it was Castiel who pulled Dean out. From that Dean bears the mark of Castiel on his shoulder. When Dean returns he doesn't know it was Castiel who brought him back. But after finding out that it wasn't Sam, Dean looks for further answers and gets help from a psyhic Pamela. From her Dean finds out Castiel's name.

Season 4
"Who are you? Castiel. Yeah, I figured that much, I mean what are you? I'm an Angel of the Lord. Get the hell out of here. There's no such thing. This is your problem, Dean. You have no faith."

- Dean and Castiel