Downpour

"Remus was saying something frantically, trying to push him back down, and then the air electrified for a split second before it was filled with a resounding crack. There were suddenly two more people in the room. Sirius stood, swaying slightly, his hair dripping wet and blacker than black. Crimson blood was smeared up one side of his pale face. The locket, blackened and hanging open, dangled from one hand. And James leaned precariously at his other side, holding none of his own weight." An AU in which Regulus joined the Order and took backup to steal the locket. Whump I wrote for myself months ago and decided to share.