So one of my favourite fics have been deleted, apparently, so now I'm hoping anyone has a copy of it? It's called Wings of Despair and was on both AO3 and ff.net. I don't remember the author's name though.

It's about Sam being bitten by a werewolf, and it can only be reversed by an angel or smth like that. Since Cas' grace is fading, he gives some of his grace to Dean, which unexpectantly turns him into an angel. Most of the fic is spent with Sam passed out and Dean leaning how to use his angel swag.

If anyone has a copy of this you'll have my eternal thanks!

EDIT: FOUND IN COMMENTS!