Does your girlfriend know we do this? I wonder what would happen if I told her. I think she would destroy your dick completely in a way that you would never want your cock to be crushed. But here's the thing... you don't make this decision but us, Mistresses. And what is that big bruise on your cock? I guess it's a gift from your gf, am I right? I'll take care of it, don't worry! It will hurt, but after this session, it will be completely gone! I know, I know... you still have a fresh wound, but again, I don't care! It's all part of the fun! You will eventually heal up in a week or so; but I won't be sure about that, as you'll be the subject for other experiments. I will carelessly step on your testicle with my heel, you know? Your balls will be kicked to heaven and crushed until they become extremely sensitive. There's nothing that's going to stop me, not even your cum. I will make you feel a very unpleasant experience... you'll regret it very soon...