Oh, Moana's desire for privacy was waging a great war against her desire to have something special all for herself. She bit her full lower lip, both because she was torn and because she hoped it might distract Simon long enough for her to think a little. "Don't we all live two lives, really? I'm sure you have your... private places, your dirty little secrets that you don't want seen in the light of day." And every bit of that, of course, was innuendo.
Not that Moana was ashamed of her private life, not at all. It was just... she shared so much of herself, didn't she deserve to have things that were hers and hers alone? Most certainly, she did, and if only Simon hadn't offered her something like that, she wouldn't be considering bringing him in to see the rest of it.
But if he was to paint something that would be hers, the logical part of Moana's brain argued, he might need to see it. And she did so want that. "Would you even want to know my secret places?"