Come to think about it, you definitely need some mind-fuckery in this kind of a relationship. Sometimes, when you think you've been good, you learn that you are going to get punished. Sometimes, after a transgression, as you confess, your knees trembling, you get told that... it's OK and you won't be punished? Is this another trap? Should you beg to be punished? Or will some kind of a retaliation come later when you least expect it? It has to be arbitrary, but not completely divorced from your actions so that there's still some semblance of control.