"What?!" Sirius said it a bit too loud and then he hushed himself. Of course Harry didn't know the truth. But a car crash? "Lily and James... Your parents, Harry. They didn't die in a car crash. They died being brave. Protecting you. And you, my darling boy, you have nothing to be sorry for. Ever. You haven't done anything to be sorry for in all your life. Trust me."
He hugged Harry tighter for a few moments, taking a deep breath. "This is a lot all at once, I know. I'm the one who is sorry." He laughed. "For so many reasons. But also... See, my family was all wizards and witches. So I don't know what it's like not to know. But I can tell you and then you'll see. When you were born, Harry, there was a bad, evil wizard. We call him the Dark Lord. Or You Know Who. No one wants to say his name. Your parents and I and some others, we were fighting against him."
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He hugged Harry tighter for a few moments, taking a deep breath. "This is a lot all at once, I know. I'm the one who is sorry." He laughed. "For so many reasons. But also... See, my family was all wizards and witches. So I don't know what it's like not to know. But I can tell you and then you'll see. When you were born, Harry, there was a bad, evil wizard. We call him the Dark Lord. Or You Know Who. No one wants to say his name. Your parents and I and some others, we were fighting against him."