The older sister was very surprised when Oshikawa, a gentle, shy and afraid younger sister, suggested that she invite her boyfriend to her house to meet her next time. She was subjective and secretly happy that her younger sister was becoming more and more sociable, so she quickly informed her boyfriend without knowing that Oshikawa had a very dark intention in mind. Finally, the day of the meeting came, when his girlfriend was in the kitchen preparing food, Oshikawa suddenly walked over and asked him if he had ever had sex with his older sister. As soon as he shyly answered, she quickly sat on his lap and put her hand on his penis and said, "Then let me do it with you first." Unable to react to such a situation, although he advised his younger sister not to do so, because he was afraid that his girlfriend would find out, he could only helplessly and silently enjoy everything she did to his body. Since then, their secret love affairs began to happen more frequently.