Incest nursing mother

Their second son, Masao, caught a cold, and Ryoko was there to take care of him. One day, Masao's eldest son, Tatsuya, visits the house to see how Masao is gradually recovering. A mistake she made several years ago...Ryoko actually had a relationship with Tatsuya. And once again, Tatsuya asks for his body... Masao peeks into the scene and gets sick with a cold again at the unbelievable sight. And Ryoko realizes Masao's pure feelings for her...