"Ah. Yes, she ... when you say it didn't feel right? She has a lot of trouble with intuitions like that. If you want to try to explain it to her, you need to -- do you watch Star Trek? Imagine that you're explaining it to Spock. People's homes are emotionally charged for them, so there's an implicit social agreement that one doesn't enter a home without the homeowner's permission. Sometimes this permission can also be given implicitly; by inviting you to live with him, he's also given permission for your friends to visit you in his house, because it's understood that that's something you would want and he wouldn't have invited you if he had a problem with that. But that implicit permission isn't extended to circumstances which he wouldn't reasonably expect; people don't usually visit at night, so you would need to ask him explicitly for permission for that."
She sighs. "It's, um, pretty hard for most people. It's okay if you can't pull it off reliably. You're important to her; you can just tell her that there are fuzzy intuitive reasons and you want her to trust you on that, and she will."