Strap on the parachute ball stretcher and then add some weights to tug/pull the balls down. The design allows for even distribution of the weight as he stands or you make him swing the ball back and forth!
Wrap and snap the parachute around the balls for a secure fit, and you will feel the sensation of tacks, about an eighth of an inch long, start to prick and scratch you. Tacks will not break the skin unless pressure and/or force is placed on the parachute
Keep your slave helpless to your every desire with a wicked device that binds those pesky wrists to those pathetic balls! They won’t be able to shield themselves from your gaze, impact play, or any attention you might bestow upon their vulnerable cock!