With a deep breath, he begins, lubing up his thick cock before guiding the tip of the metal sound to his urethral opening. He pushes gently, feeling the resistance give way as the sound slides in, his cock pulsing with a mix of pleasure and pain. He keeps going, inch by inch, until he reaches his limit, the sight of the metal disappearing into his cock driving him wild. He begins to stroke his cock in rhythm with the sound, his body tensing as he nears his climax, the sensation of the sound adding a new dimension to his solo session.