I saw this like ten years ago On Demand on Comcast, and I can NOT remember the name of it. So basically, a group of college kids/adults move into a house in the woods, and near the beginning, one of them sees a woman in the window of the house but nobody believes him. They get picked off one by one by either the house or the ghost, i can't remember. But there's like a room made of skin or something, and at the end, it's just a brother and sister (I think, it may have been boyfriend and girlfriend), and it turns out the girl is actually the monster and she kills him as the movie ends.
So... does anyone know what movie this might be? It's not a good movie by any means, but I still feel the urge to watch it again and have been searching futilely for about two months.