My friend Nikki Whiplash and I are experimenting to see the effect on a slave's cock of him being smothered and fighting for breath through our leather trousers as we each in turn sit on his face. To avoid any movement, we've trapped our experimental subject in a leather bodybag, leaving just his cock available for wanking and trampling as the experiment continues. He gets excited underneath Nikki's pert rear but, I am delighted to say, my own unwashed, vintage leather trousers (worn naturally with no pants) have an equally uplifting effect.