Ballbusting Depravity
Your prick better not be limp. Fix it if it is but do not work yourself up. Now is not the time for you to have pleasure. The pleasure is mine.
As I warned you before, I want the slack string facing towards your anus.
You're going to sit on your balls. Look at me. I'm worth it.
Set the hardcover book under your anus and sit up with your legs facing straight. Your body should make an L. It's okay to be a little spread-eagled if necessary. Now sit up and pull the string back behind you, pulling your balls onto the book/hard surface while also under the weight of your body.
SIT DOWN and crush your balls for me. Sit up straight, pull that string hard and EARN IT FOR ME. Bounce up and down to increase the pain. You can also use your legs to lessen the pain if it's too unbearable but take another look at me and ask yourself if I'm worth it.
(Continue as you crush your balls as I look upon you with glee)