Is it normal to have this type of fantasy?

I have a sexual fantasy of being a servant or slave to a leader of any anchient type of female royality. Mostly a queen or princess or something along those lines. It basicly starts of normal with me just doing work around the house for them. Then it gets progressively sexual till Im eventually having sex with her. But all flirting and sexual advances are made by her and are often deliverd in a demanding tone. Basiclly as if you are trash and you have to do what she says or face some sort of horrible punishment.