Good training is always the best thing to do. So, in this video, I train my slave's balls to be kicked, stomped and hold me with all my weight.

Then I tie his balls up so I can hold them while I kick them. They're a very good target.

Of course, there is always plenty of energetic squeezing and hard, sonorous slaps (I love them).

And finally, I jerk him off hard, squeezing his balls and him to orgasm... lucky slave :D