something i enjoy about what Arria pointed out is that asking/begging does not [necessarily] mean interrupting a scene. Quite the contrary, at least for myself, asking for the silly little things i'm supposed to be able to do myself to be done to me puts me exactly where the scene has me at that moment: helpless and at his 'mercy' if you will. Heck, even if i ask and ask and he says 'no' re-enforces and ultra-highlights the point of him being in control.