The lonely woman next door was drugged and forced to have sex with me until I became her plaything. (Hoshino Riko, START-030)

Riko, now living alone in the city to pursue her career as an adult film actress, frequently enters her neighbor's apartment to have sex with a middle-aged man. "Lend me your penis," Riko would say whenever she had free time, seeking his penis. Each time Riko entered the apartment, the man would pour a red liquid into her drink. How will their interdependent relationship develop?