After the war, Harry was dumped through the veil; "He must be dark!" they said, "no one can control elements naturally!"
The killing curse is supposed to kill, right? So when it doesn't, magic intervenes. Transported back through time, Little Harry becomes Timothy Riddle, twin to Thomas Riddle. What happens when they come to Hogwarts? And after they graduate?
The night that Sirius planned to leave to the Potters, Bellatrix confronted him. In the timeline, he left, turning her into the insane death eater we all know. But what if she did something that she didn't do originally? Something that changed everything…