A bound male slave, caged and desperate, succumbs to his Mistress's cruel mercy. A full prostate vibrator teases his sensitive gland, as he's ordered to endure until he's granted release. His cock, locked away, throbs with need. The vibrator's hum intensifies, and his balls tighten. His Mistress, watching with satisfaction, sees his body tense as he's pushed to the brink. With a final, merciful command, she allows him to cum. And cum he does, in gallons, setting records as his prostate milks his body dry.