"You are such a genius, you know that? I'm sooo bad at healing magic, but you? You could be a healer one day, if you wanted to." Sirius meant it as a compliment, given how notoriously difficult healing magic was. That Severus was actually making his own enchanted objects using it was seriously impressive. He put a hand on Severus' shoulder and caught his eyes, smiling brightly. "Thanks. I mean it. I'll get you something in turn, I promise."