Not as much a crossover as a huge cameo of GO chars in a Destiel story. Aziraphale seems to be the only one to help Castiel with the huge problem of Dean's straightness and Castiel's gender. Fluff, awkward times, Destiel, suggested A/C, brief fem!Cas. Probably suitable for Destiel shippers who haven't read Good Omens. I think.
Rated: T - English - Romance/Humor - Chapters: 1 - Words: 9,164 - Reviews: 5 - Favs: 19 - Follows: 3 - Published: 8-7-12 - Aziraphale Castiel - Complete