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After losing her husband, the mother alone raised her son, who has now graduated and secured employment. However, to celebrate his graduation, he asks for her body. At first she thinks it's a joke, but they end up having a one-night stand. One day, her son moves to a new workplace far away, so the two of them go on a trip to a hot spring for the ceremony. She wants to hold her mother again... the forbidden love between mother and son. She knows this is wrong, but her son's serious gaze makes her lose her composure. Their tongues entwine, they lick each other's private parts, and they have sex again and again on this forbidden incestuous hot spring trip.