PTS-557 They were supposed to get the prize money and be filial, but instead it's a twist game between loving siblings! Unprotected panty shot

Emergency investigation! Conducted a street interview with a sister-brother pair! "Would you like to participate in a Twister game with a prize of ¥1,000,000 to test your bond?" The prize halves each time you fail, and penalty games are added. The game started out lightheartedly, but gradually increased in intensity. Bodies pressed close together, and the sister's shameful parts were fully exposed… For a virgin brother, the situation was too stimulating, one after another. The forbidden incestuous erotic twister. The brother's reason spiraled out of control, and even the sister couldn't help but get aroused. Before I knew it, my brother's virginity was gone. Unexpectedly, there was a series of mishaps including premature ejaculation and internal release. How will the bond between siblings change in the erotic developments woven with prizes and punishments!?