Tennessee Kisser

During a threesome, the man puts his balls in one girls mouth and then the second girl slaps the ball sucker in the face as hard as she can. This results in the ball sac being stretched through the teeth and tightening around the balls, which can't escape the mouth because of the teeth. The sensation is painful and sickening if sober, but while incredibly drunk and horny it's fuckin awesome. Also makes great pictures.