"Well, that's a shame for a Slytherin," Regulus said. It was as close as he'd ever got to insulting his parents. "Right, so you have money, and you are thinking about getting a job, and you'll leave your money in a cave doing just what our parents. Really, Sirius, you're the one that is supposed to go against what they taught you," he said smiling. "So what kind of a job? And how much will I have to worry about you?" He knew his brother well enough to know that he wouldn't be a teacher or a politician.
Regulus gasped, but then grinned. "You would not do that to me. We're guests in Lucius' home. The least we can do is look better than he does."
He glared at Sirius. "He cast a spell that would let him see inside someone's head and you think it's because of robes, really?" He nodded. "Yes, that's him. He is... he's nice," he said, blushing a little. "Not like most people in this time."