My girlfriend Mistress Staci and I are curious to test out our slave's breath control. Staci sits on his face, while his balls are tied up and hooked onto reins in my hand. When one of us sits on slave's face, his struggles and screams while getting kicked in the balls result in a very pleasurable vibration. The slave serves as a human vibrating chair! Staci and I switch places and realize that the harder we kick, the stronger the vibrations. Such a slave could be very useful at parties, and those employing him could use different settings (mild, medium, extreme) to suit their desire....Needless to say, we love toying with our new toy but he can only take so much abuse. We dismiss him from the room and proceed to enjoy each other, warm from pleasurable vibrations...