My slave has expressed that he wants to be trained by whipping and spanking.
I am giving him some various lessons with very different whips - sometimes super soft strokes and sometimes much harder whippings. I enjoy seeing the surprise on my slave, when his balls are slapped or when I surprise him with a hard stroke. My slave, learns to express his gratitude, for every slap. "Thank you, Mistress" will be everything he needs. It looks like it really hurts him, but his balls are worthless and my slave adore everything I do to him - As it should be.