"I'll be bad to that rotten lot," Sirius told him, as if in secrecy, gesturing at the Dursley's with his thumb. But he smiled at Harry still, sharing a conspiracy. "I'm gonna be really good to you. I promise. I promised it to your parents, you know?"

His face softened and he held his hand out to Harry, hoping he'd take it. "You belong with me, Harry. Not them."

Finally Vernon burst out, making himself as big as he could. "I'm not scared of some runaway hoodlum! The boy is in our care!"

Sirius turned his head, his eyes narrowing and, yes, he pointed his wand. His voice was colder now. "Do you feel they do a good job of caring for you, Harry?"