"Anyhow, we don't have them but we have people who'd date a Muggleborn or halfblood girl but never dream of marrying her. I dislike them both because they are annoying and because it's hard to convincingly assert you aren't one."

"Date a who?"

"Muggles are people who cannot do the exotic mysterious things I can do. Muggleborns - people with Muggle parents. Halfbloods - one Muggle parent. If you're from a good family you'd never dream of settling down with one of them, you wouldn't have pureblood children."

"I don't think it's exactly like that, I think a converted Protestant is just as good to them - maybe better, means they won? Not sure."

"Now that I've shown you things I shouldn't anyway, we can sing and I can do something so no one but us can hear it."

"Sure, why not."

He pulls out his wand and does the muffling charm. 

"Oh nuns, oh nuns, can you hear me?" he shouts loudly.

Rebecca laughs, hard. "Mother Superior, come quick, I'm being further corrupted by the wiles of men!"

He giggles.

And he starts singing.

She comes in on the second chorus.

If he puts an arm around her after a while singing?

Well, she's invisible, so he can't get very detailed feedback, but apart from a surprised twitch she does not attempt to escape.

"Are you interested in music in general?" he asks her once the song concludes.

"They don't have a piano here," she sighs.

"I have one in my pocket but you'd have to find somewhere to put it."

"Is it an exotic foreign mysterious piano."

"Well, it fits in my pocket and is still in tune when sized up, that is the only exotic foreign mysterious thing about it. It was a present from my little brother."

"The only exotic foreign mysterious thing about it? That's all? I'm so disappointed. I have no idea where to put it, I don't think I can play an invisible piano."

"But you like to play?"

"Oh yes."

"We could just get out of here and grab your baby and get married, I have another three months of school but you could live on our estate until then."

"Is it an invisible estate? I'm not sure that wouldn't be an improvement on the convent, mind, but I'd like to know what I'm getting into."

"It's very visible and I'd take you there first and see how you like it if not for the laws about secrecy but the laws about secrecy are very inflexible. We need only be married on paper, if that helps any -"

"I'm not sure a Catholic church will do it at all, but I might as well complete my parents' despair - should I believe you about being easier to run away from than a convent -"

"I mean, to be wholly honest with you, if I wanted to be I would be much, much harder to run away from than a convent. But - if you want to go I will get you whatever frippery you need to impress New York."