Yayoi Mizuki, known for her voluptuous and firm breasts, appears in a popular series that develops a new erogenous zone for women called the 'Spence Mammary Gland.' The Spence Mammary Gland is the G-spot of the breasts! Developed by a specialist in Spence Mammary Gland research, it offers a first-time experience of unexplored breast orgasms. With skepticism, the development of this new erogenous zone leads to intense orgasms, teasing of the nipples, and intense sex with internal ejaculation! Unrelenting toy play results in uncontrollable incontinence and massive convulsions! Breast rubbing leads to intense pleasure in paizuri! Nipple teasing is allowed, culminating in explosive sex with ejaculation and ultimately leading to fainting and ascension!