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Yukio, Ai's younger brother, is staying at Ai's house for a while for his new employee training. When they start living together, the brother-in-law gets turned on by his sister-in-law wearing a tank top with her breasts exposed and a thong! One day, while Ai is taking a nap, her brother-in-law, who is excited by her thong butt and can't hold back, attacks her. Ai resists, but her brother-in-law's back piston, which makes her pee and climax...