This by no means is my plot its been borrowed.
It involves a college girl who gets abducted. She wakes up in a dark basement, on a dirty floor. All around her are windows, only she cannot see who is on the other side, since it's dark, and her space is clearly illuminated. Several men come in to take turns fucking her. At the end of the day, a large jar of cum is put in front of her. One of the men explains that behind the windows are voyeurs. Depending on how good a show she puts on, they'll cum more and the jar will be more filled. He tells her that this jar will become her only means of nutrition, and if she wants to survive she'd better make sure she fills it up good. [It can pretty much go any were from hear]