My Little Angel
This is a BillDip AU where Dipper is an angel and is captured by the devil, Bill.
Dipper is probably one of the most protected angels in heaven. Everyone warns him to not go to Earth without a few guards, but Dipper still steals away from heaven to visit the Earth. While no one can see him, he still enjoys watching the people in a tiny little town called Gravity Falls go about their normal day. One day, while Dipper was visiting Earth, he is captured by the devil himself. He's dragged down into Hell where he becomes the source of energy for Bill.
But something stirs inside Bill when Dipper isn't rude or even mean to him like most other angels are. What will happen to them? Read to find out...