GG-272 Big Sis's Real Sexual Upbringing Ayumi Takanashi

College student'Ayumi'calls her boyfriend'Kenji' home while her parents are traveling. Then she starts having sex so that her younger brother'Ma-kun'is not noticed, but she is found on the way, and Ma-kun misunderstands that her sister is being bullied because she has no sexual knowledge. In order to tell the truth to her dear younger brother, Ayumi stretched her body and conducted sex education.