This as you can imagine can be quite intense. Typically you let him know that he has to take say 10 hard smacks to the balls during the course of the evening. The first one is always a real hard one - does he really want another but he will in due course.

You can then teach him to 'ask' for the next one. A large deal of a slaves training is of his Mind, learning to control his own mind, and his body, this seems to take the form of hypnotic conditioning just as much force of will.

 

Ball roped to his nuts

An alternative is to buy one of the footballs that has a rope attached.  The other end of the rope is tied around his ball stretcher - its up to you if you want to use some bungee rope to attach the ball to the balls. This is often used in his initial training until he is correctly trained. Its up to you if you blindfold him or not. I have found it better if he can see what might be happening as the anticipation develops his fear - you might not kick it first time.

Posture

You can either tie him in position or tell him to hold position. If he stands against the wall with his legs apart and waiting you can land a perfect kick from behind. Your tow would be pointing up. If you kick from the front your toe would be pointing forward so you can get maximum coverage of his nutts.