Knocken, the exhibitionist, finds himself a solitary figure on the staircase, his mind racing with thoughts of pleasure. He unbuttons his pants, letting his hard cock spring free. He teases himself, running his fingers along his length, his breathing growing ragged. A small, discreet vibrator joins the action, its hum adding a new layer of sensation. He presses it against his sensitive flesh, his moans echoing in the empty stairwell. The toy's rhythmic pulsations push him closer to the edge. With a final, aggressive stroke, he comes undone, his cum painting the stairs.