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Rin and her husband hadn't had sex in nearly six months. Even when Rin tried to invite him, her husband always refused, saying he was tired or at work. Frustrated, Rin had no choice but to console herself in the kitchen. One afternoon, while cleaning the air conditioner, Rin lost her balance and fell. Her son, who had just returned from college, came to look after Rin. Remembering the lewd behavior he had seen her in the previous night, the son pounced on her...