My wife's younger sister, Yuno, came to Tokyo for summer school and came to stay with us for two weeks. She has a warm personality and is oblivious to men's erotic gazes, so she unconsciously seduces them. Her innocent face and fair skin struck a chord with my lolicon Kokoro, so I decided to play with her nipples without my wife finding out... I'll make her have a nipple orgasm without my wife (Yunno's older sister) finding out. After developing her nipples, she developed a premature ejaculation constitution, and I had sex with my sister-in-law many times, so I'll enjoy the nipple orgasm life.