Sumire Mizukawa, a beautiful, busty, slender woman with a beautiful waist, appears in this popular series that develops a woman's new erogenous zone, the Spence's gland! The Spence's gland is the G-spot of the breast! Developed by a specialist in Spence's gland research, she experiences her first breast orgasm! A parade of intense pleasure makes her body arch back and reach a fiery climax! Her cool expression as a slut crumbles as she cums with a toy, and she screams and faints during a Spence-caressing sex session! The constant stimulation of her mammary gland causes her to convulse repeatedly, and she writhes in agony as she reaches orgasm!