Okay, so I remember this fic from a while ago and it's really been bugging me that I can't find it so I'm hoping you can help!
Its Sam/Dean from the start of season 4, and at some point in it Dean is turned into a girl. They think initially it wad done to distract them from trying to stop the Apocalypse (I think?). Anyway, while in girl form Dean tries to have sex with this guy and Sam gets jealous, then sexy times ensue :'). Eventually Dean get's turned back into a boy, but they end up continuing the relationship and it does in fact distract Sam from Ruby cos he's with Dean. And maybe it turns out the angels turned Dean into a girl, not demons, in order to distract Sam from the path he was choosing, but I'm not sure if I'm making that bit up :') It definitely ends up quite schmoopy, but obviously there's angst to start with.

Anyway, hope someone recognizes this, I really wanna read it again! And thanks in advance if you do :)

Found in the Comments