The second installment in the series features Tsuki, the Dominatrix, punishing an M man for failing to control his ejaculation while wearing a chastity device. The punishment involves a unique and intense experiment: testing whether applying raw yam to the genitals truly causes unbearable itching. Bound and helpless, the man has yam smeared across his shaft, balls, and nipples, gradually driving him into agonizing torment as the burning, itching sensation intensifies. He writhes in pain while Tsuki cruelly taunts him, urging, "Go ahead, scratch. Please, scratch." She then grinds the yam directly onto his glans, thrusts fingers in and out of his urethra, and rubs yam deep into his anus, reducing him to a squirming, desperate mess. The climax comes as she forces him to masturbate with yam-coated hands, making him beg, "I'm sorry!" before finally allowing him to ejaculate. The vivid, sensory depiction of this merciless, itchy torment delivers extreme stimulation, making it the ultimate highlight of this aggressive, restraint-filled punishment session.