This project is for those who are curious about what happens to a brother and sister who have committed incest! A big-breasted sister and her virgin brother are offered 1 million yen if the sister teaches her brother how to have sex with her through intercrural sex... but instead of intercrural sex, she slips in raw and ends up cumming inside him! She secretly asks the brother right after he loses his virginity, "Can I secretly film you having sex with your sister?" The hidden camera captures the brother and sister seeking the pleasure of cumming inside them without their parents knowing...