The book was about a girl. I believe she was a ginger with green eyes.
She was always watched over by a demon.
One day she gets a game and she and her friends / boyfriend play it. They make paper dolls of themselves and then write a fear on the back.
They are then transported into this doll house where they fight their fears and the demon shows himself to the girl he has been protecting.
They go through all the different realms like rooms of this demon's house and he tries to win over this girl.