Mark, eager to expand his horizons, introduces a cock ring into his self-pleasure routine. The snug fit around his cock makes his shaft throb and swell, the veins popping out as he strokes it. The increased sensitivity sends waves of pleasure through him, making his balls tighten. Mark's strokes become more urgent, his hips bucking as he chases the intense orgasm he knows is coming, the cock ring promising to make it one he won't soon forget.