Sub/Dom John and Rodney

Hello everyone. I'm looking for a story from a while back. Everyone is either a sub or a dom. John is a dom and Rodney is a sub. Rodney was originally with Sam Carter, but when she stole his work and abused him (almost castrating him), he cut off her collar in the middle of SGC. Later, John takes him as a sub, but Sam still tries to cause them trouble. Oh, and the boys give exhibitions in sub/dom relations.

I don't normally go for the sub/dom stories, but this was pretty good. I appreciate any help you can give me.