Regulus arched one brow slowly, giving his brother a speaking glance. "Of course, how silly of me to have assumed you would remember how poisonous that house was, how thoroughly you scorned me for the audacity of getting sorted into Slytherin, and how completely miserable I might have been. You escaped, Sirius. I had no friend's houses to escape to. Kindly get past the fact that I knew you wouldn't help me and left. It's done and over."
"Because your godson is the Chosen one, no? He is, effectively, the only one who can destroy the Dark Lord. He can't do that until he destroys the horcruxes the Dark Lord has created. He can't die, and your godson will die in the attempt if he doesn't destroy those first."