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When she came to my house to play, my younger sister, Yuri, who came with me, was very interested in the "sex act" that I learned in class. Yuuri is like that, but only her breasts are so big that even adults are surprised by their growth. However, she is insensitive to the charm of her own body and wants to experience "sexual activity", so she innocently seduces me with her breasts... Eventually, after crossing the line, he began to come to my house regularly and be pestered for 'pleasant SEX'.