Kalyspil's spankball session begins with the submissive, hands bound behind his back, kneeling before his mistress. She attaches the spankball harness to his cock, leaving his balls exposed. The game starts, the sub trying to keep the ball balanced as the mistress strikes him with a flogger. The sub's cock twitches, fighting the urge to harden, as the mistress' strikes land on his ass and thighs. The game escalates, the mistress adding weights to the ball, pushing her sub's endurance in this cruel, cock-centric BDSM challenge.