DASS-175 Mother married 2 daughters fucked

The film opens with a scene where the mother is talking to her daughter about a man coming to live with them, and that man will be her new stepfather. Although she doesn't want it, the daughter has to endure it because she wants her mother to be happy. One day, while the daughter is masturbating, the perverted stepfather secretly films her on his phone, and in the end, he uses that video to blackmail his wife's stepdaughter.