In the quiet of his room, an amateur explorer delves into the uncharted territories of his own body. With a curious, almost reverent touch, he guides a slender metal sound towards his urethra, the cold metal a stark contrast to his warm, pulsating flesh. He gasps as it slides in, the sensation intense and new. His body responds, cock hardening, breath quickening, as he pushes further, the sound disappearing into his body. He explores, his hand moving in rhythm with his body's responses, his mind racing with the newfound sensations of prostate stimulation and urethral play.