My slave wants to prove how stretched his urethra is for Me and how well he can handle any sounding I want to give him. It doesn't matter how extreme, he is my slave to use and stretch. So I have decided to use my heel to fill his cock up! I put a small condom on the heel of my boot and see how much I can slide in his cock. I am so happy with what he takes for Me, reveling in the sight of it bulging in his dick as it slides in and out. I push it in as far as it will go, watching his loose hole stretch around it. Then I take his hole with my finger once again, claiming it entirely as mine. Break your dick for Me. That's what I want to see.