Mao Kurata, with her super sexy H-cup body, takes on the popular series of stimulating a woman's new erogenous zone, the Spence's gland, and making Mao Kurata for the first time! The Spence's gland is like the G-spot of the breast. The Spence's gland is stimulated deep inside with a Spence's gland development device, and she climaxes with trembling excitement! Developed by a specialist in breast research, this is her first breast orgasm! Nipple teasing sex, toy torture leading to incontinence, sensitivity-boosting titjob, and breasts developed for endless pleasure exceed their limits and reach intense climaxes!