In the quiet of his room, a man stands naked, his cock rock hard, ready for a unique form of self-pleasure. He takes a deep breath, grabs a metal sound, and presses the tip against his urethral opening. He pushes, feeling the resistance give way, the sound sliding in, cold and hard against his most intimate flesh. He pulls it out, lubes it up, and pushes it back in, fucking himself with slow, steady strokes. His body responds, his cock pulsing with a mix of intense pleasure and slight pain. He increases his pace, his moans filling the room, until he can't hold back any longer. He pulls out the sound, his cock erupting with a stream of cum, his body shaking with the force of his release.