美麗纖細的竹內由紀傾情出演這部人氣系列作品，該系列旨在開發女性新的性敏感區域——斯賓塞腺！斯賓塞腺是乳房的G點！由斯賓塞腺研究專家研發，它將帶給你前所未有的深層乳房高潮！在乳房按摩過程中，她會弓起背，發出尖叫聲；在斯賓塞腺性愛中，她的乳頭會被挑逗，並噴出液體！乳房刺激會讓她因快感而劇烈顫抖，甚至尿失禁！她甚至會因為摩擦乳房而達到自慰高潮！在性愛過程中，乳頭也會受到刺激，她會尖叫著達到高潮，展現出非凡的高潮能力！
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