Contrary to popular thinking assertiveness has nothing to do with aggressiveness. As a matter of fact they are polar opposites. If you assert your boundaries as I do in a healthy manner you will create an atmosphere of safety for your prospective client/slave.
He will not be guessing at your meaning, intentions, desires or thoughts. Knowing the rules makes for a level of comfort and security that most clients/slaves need, they know I can be trusted as a result many clients/slaves alllow you to dominate them in all sorts of ways and I know so many.
One of the things my clients/slaves like about me, I never normally ask what they want I just tell them, most of my clients/slaves don't always want to make decisions so I make them for them, so visit me and I will make some kick arse decisions for you and you are welcome to tell me what you like!! if you behave you will get it if not well that is for you to find out.