I'm doing a rec list for a friend of mine who's new to the wonders of Supernatural fandom. And I remembered this series of oneshots I read awhile ago. Basically, Gabriel came to help the Winchesters avert the apocalypse without Sam having to say yes. They backstabbed Lucifer (literally, I think) and Team Free will went to Chuck to celebrate. I think in part 12 or 13, Gabriel figured out that Chuck was God. And he was bugging Chuck so Chuck teleported him to the Antarctic. It was either gen or Destiel.

Sound familiar? Would love some help.