Martin put me in a slow-burning position. Anything that involves me standing with my knees bent and having to hold that position always destroys my legs. And the realization hits the same way every time - when Martin cinches the rope that goes from my chest to my ankles and brings my face to my knees. "Oh, fuck" is always the first thought that comes to mind. There's no way I'm holding this for a long period of time but somehow, I maintain it. And because I was good, Martin unties me and while I'm still trying to recuperate, he rewards me with an orgasm.