I like to have my wife wrap one hand around my scrotum between my balls and body. I have a lot of sack so this just limits the amount my balls can move around. She can then pinch one ball between her thumb and index finger and squeeze until I start squirming and moaning. Then she pinches the other ball for a while. Just to change the pace she forms a fist like you would for knocking on someone’s door but instead she hits my balls. After ten or more hits she goes back to pinching the balls. There are several other painful things she likes to do. I really get off on the idea it’s up to her to decide what she is going to do next and how hard and for how long.