There were two stories I remember reading but can't seem to find anymore. The first one I remember the name was Webcam something a father finds his daughter has a Webcam show and blackmail her to scare her. He comes to find out she is being blackmailed by someone else and so is his younger daughter, his neighbor and her daughter as well.
The second one I dont remember the name of the story. A boy comes back from the summer or something. I remember one scene is where the boy watches from a window with another girl as his girlfriend is gangbanded with his sister there, and some guys from the neighborhood that his girlfriend doesn't like. He finds out they are blackmailing her to be there slave.