Specific kink meme fic...

[dreamsofspike]

I'm looking for a story I read where Cas came to the bunker after the angels fell, andDean is severely abusive to him, including sexually, and makes him hide it from Sam. I remember that Cas had a little box of items he'd collected that he found pretty or meaningful, and he was afraid Dean would be angry at him for having it.
I know it was on the kink meme a long time ago, not sure if it was ever posted anywhere else... anyone know the story I'm talking about? :)

Thanks!