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A new mother and her first sister who came to our house one day. At my age, who is studying hard for entrance exams, that existence was too dangerous. Koyuki, a sister-in-law who is tied up by her father and immersed in an affair while her mother-in-law is away. Whether I know it or not, my mother-in-law, Hitomi, treats me gently, turns affection into lust, and is frustrated with soft man meat. And one day, the desire of two sluts parent and child turned their fangs on my body! !