Dean not allowed to leave a cave

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I don’t remember much of the story that I’m looking for other than Dean not being able to leave some kind of cave or temple because of being a virgin? It might not have even been that either. I’m not sure if Sam was able to but I know it was mostly focused on Dean. I remember a scene where he tries to just run out of the cave and he actually gets thrown back. Anyone know what fic I’m talking about? Thanks in advance!

FOUND: Link in comments. Thank you! :)