Orgasm Denial Diet
Once that chastity device goes on, I won't be letting your penis have much freedom. I'm just trying to decide if I should let you cum tonight or not. Like a last hurrah. Once it goes on, there is another rule. Any time your penis gets released, I will be hurting your balls.
I will be spanking your little nuts with my wooden hairbrush, or maybe just the palm of my hand. You see, when you get some freedom, it will be so I can stroke your little penis to the edge several times before I lock you up again, and I can't have you spurting as soon as I touch it, can I? Pounding and spanking your balls will take away a bit of your lust (I think). I'll enjoy it anyway.
Now show me you can take it. Stroke to the edge again, not too close. As soon as you get to the edge, start spanking your little testicles.