Sister Lovedoll (2000)

An erotic drama in which Aiko Hoshino, a sexy actress of "100 Tales of Beasts", and REIKA, a former model for Cawaii, starred in W while sprinkling pheromones. A mentally retarded sister who can't live without her sister, and a younger sister who devotedly supports such an older sister. The younger sister, who is worried about her sister's safety and hesitates to marry her lover, is gradually cornered and drowns in sex in desperation. In such a situation, the older sister, who is anxious about being abandoned by her sister, also sees the shadow of a man and hides it.