Prestige exclusive actress Mion Sonoda seduces her younger sister's boyfriend♪ While waiting at her sister's house for her to return from shopping, the boyfriend is left alone with the older sister, Mion. She flashes her breasts and pounces on him! Despite his desperate refusals, she shows off her voluptuous body, traps his erect cock between her tits, and toys with him! From the bath to right next to her sleeping sister, the older sister's bold actions escalate, leading to a forbidden relationship! One day, they are caught having sex at his house by the younger sister. When the sister vents her anger, the older sister snaps back! A physical battle between the sisters for the man begins, leading to a shocking conclusion...