Her beloved mother owes fifty million yen, and wealthy Yoshimura offers one cruel way out: sign a contract to become his personal nipple toy. Refusing would destroy her mother, so she strips with trembling hands and enters a life of humiliation. Fingers, brushes and vibrators torment her breasts until their sensitivity multiplies beyond control. Soon even the slightest friction while cleaning or serving drinks makes her burn with need. Remade into his obedient plaything, she finally finds herself begging him to keep teasing her nipples until she comes.