This is a Harry Potter story. I do not own any character or any plot except the ones I makeup and the plot I change.
Sirius Black's twin, Aquila Black, is accused of murdering the Potter family, included Evangeline Potter, Harry Potter's twin. Evangeline, alive and disguised as a Malfoy, is sorted into Hufflepuff, much to the dismay of her family, save her "twin" Draco. Aquila, nearly insane after being trapped in Azkaban for 12 years, and on the run for 5, is unknowingly part of the prophecy she herself predicted. What will happen when these two twins, one forgotten and the other people wished they could forget, come back and find the acceptance in one another they never could find in their own families? Maybe the world will be saved. Or maybe the world will end. Who knows.