One of the many things i crave is for my body to be worked on by a Master Sadist. i want to be led to feel pain and pleasure as one, starting with mild pain and going deeper and deeper into torture, being sexually stimulated all the while. i want to be bound at first to minimize any struggles, and i would like it to go on and on, no matter if i scream "no! or stop! or let me go!" How long can such a session last? What is it like for both parties?