In this popular series that develops a woman's new erogenous zone, the Spence's gland, Sora Amakawa, a slender beauty with beautiful breasts, appears! The Spence's gland is the G-spot of the breast! Developed by a specialist in Spence's gland research, she experiences her first shocking breast orgasm! A gland development massage that makes her pussy wet and her body tremble, and Spence's stimulation sex that teases her nipples to the fullest! Toys that stimulate the mammary gland with pinpoint accuracy make her incontinent! She gets too excited by a titty fuck and climaxes by herself! She loses control as her nipples are stimulated!