Hi, would something like this work for you?
In the beginning my character is a spoiled rich boy who's never heard the word no before when it come to almost anything. When I'm horny I just stop a maid in the hallway and fuck her as I please, firing any maid who rejects this idea. One day I spot your character wandering down the hallway and have to have her then and now. I pin her to the wall and do her from behind all the while she chants a spell in a language I've never heard of. Afterwards, I awaken to find myself in the body of the maid and quickly run into your in my old body.
Your character says that for now I'll have to be her little sex toy if I want anny chance of getting my body back. She then starts to treat me in the same evil way I'd treated my maids up till now, forcing me to suck and take in my own cock.