A rather straightforward stress position I use involves the pup cage and some heavy metal. I put the sub on his knees inside the cage with the heavy metal collar (10 pounds) on. I put the heavy metal wrist shackles (12 pounds) on him and lock on a chain that runs over a bar on the top of the cage. The other end of that chain is connected to a parachute on his balls. If he brings his arms down to rest them the chain immediately pulls on the sub’s balls.