One of my best friends uses me as her sex slave [MF]

I met my friend, lets call her Emily, while at university about six years ago. We met on the first night of freshers during a game of ‘never have I ever’. suffice to say, these things quickly went onto sex, as they do, and I essentially revealed that I was a sub. People laughed, I got a couple of questions, but nothing more than that. the drinks continued and night went on. I didn’t think much more of it to be honest.

Cut to a few weeks later and me and Emily were grabbing a coffee and she started asking me about being a sub, what I enjoyed about it, what my kinks were etc. As it turned out, she revealed that she was a switch, but tended to lean domme. The conversation progressed, me telling her how i had a thing for latex and assplay, she telling me how she loved tease and denial, collars, femdom and bondage. It was cool, we had a good laugh. That kind of started our friendship really.