Seduced by the powerful girlfriend's younger sister, Ishihara Nozomi, swallowed and spit out the most depraved version of herself. (MIDV-415)

My name is Atsushi. It was only after we started dating that I learned she lived with her sister. Incidentally, my girlfriend is incredibly skilled at housework and very gentle. She's serious and rather conservative about sex. However, her sister is completely inept at cooking and housework, yet extremely proactive in matters of the flesh. She's a typical predatory woman. She has a habit of licking things, instinctively unable to resist licking various objects. Even when I was so close to my girlfriend, my heart and body were completely captivated. This is the story of how I succumbed to this obsession with oral sex techniques…