I read a story a couple months ago that was Dean/Castiel. I only remember a few parts of it and have Googled for it and came up with this community, so I'm giving this a try.

There's a scene that sticks out in my mind, of Cas taking Dean roughly/without consent over the Impala while out in the wilderness/desert. And when its over a mountain or hill or some type of land mass has been shifted or destroyed because of Castiel. Its a bad relationship between the two of them where it gives you the idea that Castiel is abusing Dean.

Another scene is when Castiel saves both Dean and Sam from demons and they end up in this large hall. The author provides an image of it and it looks a lot like something from the Lord of the Rings. And Castiel gets healed or something through the hand print on Dean's shoulder and Sam is somehow involved in that.

That's most of what I can remember of the fic. I'll place some tags and maybe that will help. It was pretty long though. Thanks.