Sumire and Misora, who are mom friends, are good friends with their sons, and they can talk about anything, including small talk, worries, and sons. One day, when the two of us are having a conversation as usual, the topic turns to sex. At that time, Misora is surprised to hear that she had sex with her son from Sumire. Misora, who is frustrated because she has not been dealt with by her husband, asks Sumire for advice. Sumire who heard the consultation accepts Misora's proposal, saying that although she is surprised, it seems interesting. A few days later, Misora and her parents go to Sumire's house to play, and the two naughty mom friends...