Originally intended to win the reward to fulfill filial piety... it turned into a fun game between close siblings! Unsuspecting exposure of underwear and exposed breasts drove the virgin younger brother wild! PTS-557

Urgent Investigation! A live interview with a brother and sister duo on the street! "Want to participate in a 'Twister' game to test your relationship? There's a reward!" The reward is a whopping 1 million yen! But with each failure, the reward is halved, and a punishment game is added. What starts as an easy game gradually increases in difficulty. Their bodies are pressed tightly together, the sister's private parts completely exposed… For the virgin brother, the stimulation becomes overwhelming. A forbidden, super-erotic brother-sister twister. The brother's rationality collapses, and the sister involuntarily becomes aroused. Unbeknownst to them, it evolves into the brother's graduation sex as a virgin. There are even several unexpected incidents of ejaculation inside. In this erotic unfolding of rewards and punishment games, what will become of the bond between this brother and sister!?