Yumi Kazama, a 21-year AV actress, appears in this popular series that stimulates a woman's new erogenous zone, the Spence gland, and makes her cum! The Spence gland is like the G-spot of the breast. The Spence gland is forcibly stimulated with a Spence gland development device, making her cum with trembling excitement! Developed by a specialist in breast research, this is her first breast orgasm! Nipple-teasing sex, toy play that makes her urinate, tit-fuck that increases her sensitivity, and a beautiful mature woman who cums over and over again as her ripe breasts are thoroughly redeveloped are a must-see!