The transformation is gradual but unmistakable. From a soft, docile appendage, it becomes a throbbing, veined rod, standing proud and eager. The man's breath hitches as he feels the change, his heart pounding in sync with his growing arousal. He wraps his hand around the pulsing shaft, marveling at the contrast between the velvety smoothness and the unyielding hardness. His strokes become relentless, driven by a primal need, until he reaches the precipice, his body convulsing with release.