Compulsive Masturbation

This will surely not take place in every session, but sometimes I will make an exception for this.
I am curious how good you are at this. Show how potent you are. I like to make myself comfortable and watch you play with yourself. Watch your hand moving up and down your dick. I might even encourage you too.
If you try real hard, I might even let you come. But on my command only of course!