Need help finding a Reid assault fic

I don't have much memory of it but what I do remember was that it was a short story, maybe one or two chapters where Reid was with an unsub who had sexually assaulted him with a gun (I think it was a shotgun). But Reid didn't acknowledge that it was happening to him, he thought he was witnessing it happening to somebody else. When the team find him, they see the blood and realised what had happened.
I have been searching for this for a while and would really appreciate it if somebody helped me find it.