The Deals Made With Demon

As a mortal mets and falls in love with a demon, she leaves him and marries the lord of lords and has a child that will soon be part of a deal some might think of as Rumpelstiltskin.

The angel baby will be barterer to the devil and raised by demons. She gets curious and sets off to live on Earth. Her "father" won't let her go unless she is accompanied by a demon that will pose as her brother. Its not to long before she falls in love with an angel. She should have know by the fact of his baby blue eyes, light blond hair, smooth hair and perfect grades and background. However, his past and future will be polar opposites.

Will the most unlikely pair cause a repeat in history, or repair the past, present, and future?