Ayaka, who lost her parents early, looked up to her relative Kayo as a mother... but she would secretly watch Kayo and always masturbate with her body as the object! One night, Ayaka, who had reached the limit of her patience, lesbian night fucks Kayo! Even Kayo, who was initially confused, understands her feelings with Ayaka's intense caresses! Eventually, they cum to death in forbidden incest while fiercely tormenting each other's pussies and anuses! Only in the distribution-limited version, a making-of video showing the true faces of the two anal monsters is included!