A family trip to a hot spring was the beginning of a forbidden mother-son bond... A parent and child fall into incest at a charming rural hot spring resort. "Mom, that feels so good..." Before she knows it, the mother is drowning in the pleasure of her son's rod. "Aah! "No... I'm going to cum with my son!" In the open-air bath and in the guest room, the lustful mother and son have sex over and over again. A 240-minute intense drama featuring three plump, voluptuous mothers!