Draco gave a nod, pleased to earn the compliment from his previous professor. The subject about the charm was interesting, but he was more curious of why he could do it.

"How come...I was able to do a corporeal Patronus despite being raised around dark magic? The only other person who I know who could do that was Professor Snape. If we change...does that mean what we can and can't do will change?"

It was strange talking to his professor after all this time. They had never really conversed when he was his teacher...especially after that prank. But to talk to each other as almost equals made the conversation awkward. It was also difficult to decide what was okay to reveal and not.