A little ball busting never hurt anyone... just kidding! I've already put my slave through a lot as his body is covered in marks... lets warm up with some twisting, then move to kneeing then good old kicking. I occasionally stop to stroke his dick to insure he stays hard before slapping some more. By the time I'm done with the slave I've kicked him over 50 times not including knees and slaps. Could you handle this?