A vulnerable slave, balls bound and cock throbbing, is positioned above a cruel mousetrap. His dominatrix, eyes gleaming with sadistic glee, slowly lowers him onto the device, the cold metal pressing against his sensitive testicles. She teases him, edging him closer to the brink of pain, before suddenly releasing the trap. The slave yelps as it snaps shut, capturing his balls in a vice-like grip, stretching his nutsack taut. His cries fill the room as the dominatrix laughs, stroking his cock to maintain his erection despite the agony.