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Sae divorced her husband and lives with her son. My son doesn't have a girlfriend, he doesn't go out on holidays, he just sleeps all day. Once in a while, I invited him to a hot spring trip just for the two of us to take him outside. A son who has always loved his mother... Sae was puzzled by his sudden confession, but he gave in to his son's enthusiasm and opened the forbidden door with the promise "If it's just once...". It was a one-time promise, but eventually the swell of pleasure awakens Sae's female instincts...