Now it's time to experience some serious pain for my slave. I make him lie down on the floor with his feet in the air - and his legs spread - this way he can't protect his cock and balls when I step on his groin. I'm starting to trample his cock and balls with my black flats - even though they're flats, they have a hardened heel and they'll cause some serious pain :-) After a while I take off my shoes and continue to trample his groin under my bare feet.