In the wake of Sirius' death, Harry knows that things need to change. Regardless of his agreement, things would have changed anyway. His childhood and future are about to collide in a way that promises bad things for anybody not on his side. Verydark!Harry. Slash.
Harry was never going to be a member of the Dursley family; but with effort, he could be tolerated. As a child, a desperate and cynical Harry makes a decision that has ever-reaching consequences. Verydark!Post-Sirius!Repressedmagic!Harry. Slash.
It hadn't been Charles becoming the boy-who-lived that started it. Harry had always been neglected and less loved than his brother. It seems an awful thing to imagine- one unlikely of the potters-but it was true. The prophecy was just an excuse to take it further. Dark!Harry. Slash. Future character bashing.