Hey! I'm looking for a fic but all I remember is that Sam and Dean performed a spell to banish all the angels from Earth. Months later (or longer) Castiel appears and Dean asks why it took him so long to come back. He didn't understand that banishing all the angels included Castiel. This might have been a Dean/Cas fic, but it could have been gen for all I remember. Please Help!

Found in Comments!!!