Emi raised her son as a single mother, and when he got a job, he started living alone. Feeling lonely when her son graduated from school and left home, Emi decided to take him on a trip to a hot spring to make some memories together. Her son offers to help her as she tries to get changed into a yukata robes... He buries his face in his mother's voluptuous breasts and says, "I love you, Mommy..." Emi is confused by this sudden confession, but she doesn't want to end it as a woman yet... and takes her son's penis in her mouth, enjoying the pleasure of forbidden incest over and over again in this story of a mother and son.