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My wife "Nanako", my husband "Ryo", and my friend "Toru" have been friends since college and can talk about anything. Neither Nanako nor Toru were aware of each other as the opposite sex. One day ... On a late night at work, Toru took out the hemp rope and introductory book he had purchased for her younger girlfriend, and started tying Nanako as a practice table for fun. Toru's line of sight to Nanako gradually changes to the line of sight to see a woman ...