After his brother gets married, a young adult man moves in with kind, capable Kanna. She pays little attention to how she dresses, cleaning in a thong and tank top with her cleavage exposed until he can barely control himself. One day she catches him masturbating with her underwear. His restraint breaks and he thrusts straight into her thong-framed ass, pounding her from behind until her anus twitches and her body convulses in orgasm. He crosses the forbidden line by creampieing his brother's wife again and again.