Specific: I'm looking for a specific fic (possibly it was a series of fics) in which Sam has a debilitating injury during Season 5. I believe he was lame and in constant pain. Lucifer refuses to heal Sam until Sam says yes. I think it was leading up into eventual Sam/Castiel? Though it might have been gen. Found: Will You Serve Verse

General: I can't seem to find any Sam/Castiel involving Godstiel. Does this exist? Honestly, I would accept anything featuring powerful!Cas exerting power over Sam. Bonus points if Cas is super possessive. Dub-con, non-con, and Wincestiel are all fine.