In a dimly lit room, a master and his sub engage in a test of endurance and control. The sub, stripped bare, is secured to a sturdy frame, his back arched, ass cheeks clenching in anticipation. The master, clad in leather, takes up a rigid cane, running its length over the sub's flesh, tracing the path of the 400 strokes to come. Each impact is a symphony of flesh meeting wood, the sub's grunts of pain and pleasure echoing off the walls as the master's arm rises and falls in a steady, hypnotic rhythm, painting the sub's buttocks with a tapestry of crimson stripes.