"Darling, if I don't want to answer or if it's too much, I'll let you know. I've found that leaving people to their imaginations can be useful, but you're sweet and I have no need to manipulate you like that." Maybe she shouldn't be quite that honest, but it might continue to be refreshing? Lu can and does lie, but what's the point if she doesn't need to.

And blunt honesty tends to make people believe her all the better when she really does need to lie about things.