A young man, in the privacy of his room, donning a simple thong, begins his solo session. His cock, soft and relaxed, barely fills the skimpy garment. He strokes it gently, feeling the smooth metal cock ring around his base, a cool contrast to his warming flesh. As he grows harder, the ring tightens, his dick swelling to impressive proportions. He catches his reflection in the mirror, pausing to admire the transformation from soft to steel-like rigidity.