I decide to give my slave a treat. I am going to give him a handjob all the while beating his ball until they're black and blue. I will allow him to cum as long as he doesn't ask for mercy. I really clamp down hard and long on his testicles. Squishing them between my finger and thumb, while stroking his oiled cock. Watch as he thrashes on bed trying desperately to fight the pain long enough to cum. I squeeze and slap and then squeeze even harder, my pussy getting wet watching him cringe, gasp and thrash in pain. he knows I am not going to let him cum, but he thinks he can take it long enough to squeak in a quick orgasm.. He was wrong and gives up with me crushing his nuts denying him any release. his only reward for the night is a set of black and blue balls.