My slave is aching to cum when I start to tease him with my slippery gloves on his cock. There's one catch. He knows I'm not going to simply jerk him off. There must be a sacrifice. I tie up his balls tightly and yank them hard, softening his erection. Then I stop, and stroke him again to full hardness. I do this again and again until he can take no more. Right at the moment of climax, I pull his ball hard, making him explode in pain and pleasure! Edging with a side of CBT, just what I wanted!