Natasha and Sirius
"Oh," Sirius replied, glancing up and down the bar. He didn't see Wormtail. "One of my friends apparently betrayed the lot of us and because of it two of them died, and I went to prison for years until I escaped. So like I said, here is better."
He started to take another drink but thought better about it as she asked her question. "Oh." People had talked about magic freely here, hadn't they? "Uh, who could practice magic. People from pureblood wizarding families or those who supposedly diluted magic by not being pureblood. It's ridiculous, really."