다음 중:Sae divorced her husband and lives with her son. Her son doesnt have a girlfriend, doesnt go out on holidays, and just sleeps all day. She wanted to take her out once in a while, so she invited her on a hot spring trip just the two of them. Sae is confused by her sons sudden confession, who has always loved her mother, but she is overcome by her sons enthusiasm and opens her forbidden door with the promise of ``if its just once... Put it away. She was a one-time promise, but soon the surge of pleasure from her awakened Saes female instincts...