Phantom Mother Forbidden Mother and Child Swap

The Hojo family and the Sato family are so close that they even throw house parties. There, Misato and Miki become friends with each other's sons, and before they know it, they begin a relationship. One day during a party, Misato suddenly came out about it. Miki was surprised, but not to be outdone, she also came out about their relationship. And then, the two sets of parents and children began to mix lewdly with each other...