The person my mother remarried has a son and both of them are lewd. Her mother is also a slut, so they start having sex in front of her stepfather and daughter. Eventually, her daughter can't hold back anymore and ends up having sex with her stepbrother. The father-in-law, who can't help but want to have sex with such a daughter, presses her daughter, saying that he will cry if she divorces her mother, and fucks her daughter. However, she is an erotic woman who inherited her mother's orgasm, and she has this mother and daughter.