I've been thinking of two fics that made me literally lol back in the day, hope you guys can help me find em!
#1 Has both sabriel and destiel fighting something with tentacles in a lake, with Gabriel coming back, reappearing first to Sam, and the boys getting together.
#2 Gabriel comes back and turns team free will into animals, with Sam of course as a Moose, and I believe Dean as a small creature. Might have background Destiel
I read both on Ao3 and don't think they were very long.