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Due to work, Hiroshi was staying with his older brother and his wife. His brother's wife looks very young for her age, and is beautiful and voluptuous. Hiroshi, a virgin, gradually became fascinated with his beautiful sister-in-law who lived under the same roof. His sister-in-law masturbates, their nightly activities, bathing... Hiroshi enjoyed peeping and masturbating at every scene. One night, his brother said, "Can you stop peeking now?" Yes, the two of them knew everything Hiroshi was doing...