If there was any chance that Aziraphale was going to inquire about it, it is surely lost at the mention of her being a knight in the past. Between the two topics, he was far more interested in hearing about her tales of knighthood. He's just about to open his mouth to pose the question before she leans in with a question of her own.

"Why, of course, I would be delighted to remain in your company for a touch longer."

He does recognise that he likely shouldn't keep her all that long, not when she surely had other things to attend to this evening, but he was having a delightful time in her presence.