GG-137 Big-titted American mother and Japanese son's incest

Yusuke lost his mother when he was young, and his father remarried and now has an American mother. One day his father goes out and he is alone with his mother at his house. Yusuke is reading a book, but his heart beats fast when he sees his glamorous mother cooking in the kitchen. Yusuke, who had begun to become interested in sex, gradually became impatient and approached his mother. Her mother takes Yusuke's hand and gently teaches him sex, leading him into the adult world.