Possibilities:
I am a Mistress! You can be only a slave to me and nothing but a slave! You must treat me with respect. You are here to listen and obey! You are here to serve me! During the session, you are not allowed to do anything without taking a permission! Once after you step into my BDSM room your body, mind, thoughts, needs, and desires become all mine! I will decide what and how much you must take! Also how far we will go! Or when you can take a break and do you need one! Do you dare to call me slave