You My Good Sir are an Asshole (but I Still Love You)

Castiel Novak and Dean Winchester have been best friends since forever when Castiel was sweet and awkward.Over the years he has turned into what most of his family call a douche. The only one who can still stand him is Dean but will Castiel manage to lose him too. Dean/Castiel, Destiel Dean/Benny for a while, Jealous/Possessive!Castiel, Douche!Castiel, Nerd!Dean, OCs