Fallen Angel

Cally Mitchell wasn't just another 16 year old girl, she had lost both her parents in a car crash, and started to do cruel thing to people in her time on earth. One day, she snuck out of her foster home to go to a party when out of nowhere a car came by and hit her on the sidewalk.
When it came to her judgement day, God gave her two choices, to go to the underworld, or have one more chance by being someone's guardian angel and the task to change their life. She chose the 2nd choice and she was assigned to non other than a 17 year old boy, Shawn Mendes. God warned her about one last thing, and that was that she can't fall in love with a human on earth for it was forbidden. Will she be able to complete her task? Or will she fall in love with the talented singer?

Pov will change from shawn to cally's