Alone in his room, a mischievous young man decides to push his limits. He strips naked, his cock hardening as he anticipates the pain and pleasure to come. With a determined look, he grips his balls tightly, applying just the right amount of pressure. He begins to punch, each impact sending waves of sensation through his body. His balls swell, turning a deep shade of red, as he continues his self-inflicted CBT. Sweat beads on his forehead, his breath coming in ragged gasps, but he doesn't stop. He's a master of his own body, pushing boundaries, seeking that sweet edge of agony and ecstasy.