Defining Gravity

What happens when your moms an angel and your dads a devil you thought you would be half of each or so you thought. Violets parents committed a sin by loving each other. They were both told to stop seeing each other, so they defeated the two rulers in the name of love. They sent the rulers of their kingdom in a realm that's impossible to get out of. Years later they had two lovely daughters Violet and Rose and passed on a law stating that devils and angels can be together. Somehow the rulers grew powerful each day and escaped the realm proclaiming war with their own kind. On the run the girls parents got captured and the girls were told to run and not turn back. The ruler of heaven was holding angels as prisoners as punishment and those who didn't want to be slaves fell down to earth know to be fallen angels.