Popular series introduces exclusive actress Yuzuriha Karen to develop a new erogenous zone for women, the "Spence Mammary Glands"! The Spence Mammary Glands are the G-spot of the breasts! Developed by a specialist in Spence Mammary Glands research, her H-cup sensitive body trembles for the first time with chest-induced orgasms! Despite doubts about the existence of the Spence Mammary Lines, she experiences a torrent of orgasms! Overwhelmed by the pleasure, she squirts repeatedly and spasms with orgasms! Stimulating the mammary glands further with toys makes her so sensitive that she orgasms during paizuri! A three-part session thoroughly develops her to the point of fainting from chest-induced orgasms!