One of the good things about being brought up with proper manners is that it's well simple to answer someone and not tell them anything much.

I didn't mean it like you're ashamed of me, what, only that I'm not at all keen to face your father! I'm sure he'd make mincemeat of me in no time, what? I mean to say, he gave us permission to go to the ball but nothing more than that. I'm surprised he's not wondering how you're getting on with making Marvolo jealous by now.

Indeed, it's getting late. And yes, I'm rather done in, too.

Sweet dreams, Dux,

-Justin