Still naked with his hands cuffed behind him, I put his cock and balls in a cock stock, making him stand on his toes to relieve the pressure on his genitals. Then I gradually raised the level of the stock, increasing the pressure on his toes and legs as I enjoyed his pathetic struggle to protect his balls. He started to grimace and moan, his calf muscles strained to hold his body up until they started to cramp and he complained of the pain. I massaged his firm calf muscles but offered no other relief. I left him in this position until he begged me to release him.