JUFE-530 A man uses his girlfriend's video to blackmail her sister into training, Amatsuki Azu

Miyata, careless with money and women, discovers that his girlfriend's younger sister is close to him and decides to use that. He sneaks into Azu's room while she sleeps and threatens her with a video of her older sister. Azu resists at first but gives in, and later he calls her to his home to train her with an aphrodisiac until she squirts and becomes his urinal. This runs about 44 minutes from 2023.