A Specific Fanfic: Dean Abuses Castiel Unbeknownst to Sam, Explicit

[x_highonlife]

Hello all,

I am looking for a specific fanfic that I read several months ago. In the fic, Dean consistently abuses Castiel, but Sam has no idea that it's going on. Castiel is overcome with guilt and thus allows the abuse to happen. I remember it being many chapters long as it took me a while to complete. It is a completed story.