If you want to see buttocks clamp down tight and hear hysterical laughter turn quickly to grovelling this clip is for you. Med students should watch this 21 minute clip for the study of muscle contraction in the legs. Her hysterical kicking and body flexure during avoidance maneuvering provides an excellent opportunity to study the functions of specific muscle groups. Extreme contraction during anal penetration suggests that she'd be an incredibly tight ass fuck. Her feet also show extreme sensitivity to vibration. Her soles and between her toes were explored to cause squealing and squirming. A good hard fuck would be a relief now...