There's a way for Dean to get rid of the Mark. Castiel never explained exactly how, but it was not necessary. He would do it anyway.
Supernatural - Rated: T - English - Drama/Romance - Chapters: 1 - Words: 2,581 - Reviews: 3 - Favs: 9 - Follows: 4 - Published: 4/28/2015 - Dean W., Castiel - Complete