Auto-stretched nipples

BDSM idea by Magnuz Binder.

Every time you shift position, any slack you managed to get in the taut strings to the clamps on your nipples are taken up by the weights in the opposite ends of the strings after they passed over the overhead beam. The friction between the beam and the strings make pulling it back require far more force and stretching of your nipples, so you have given up on that and try to remain motionless, teetering up on your toes by now. Your hands tied high and tight behind your back prevents both your release or relief of your nipples, as well as covering your ass from the whip I generously apply to it, making your standing still quite a bit more difficult.