Actually, take her out in her state.

"Okay Lucy, get cleaned up and dressed. We're going to take a walk," he grinned.

"Oh, yes Master!" she said, excited, heading to the bathroom to give herself a quick rinse. Once she was done, she threw her clothes back on.

Meanwhile Natsu, realizing that just having Happy wait elsewhere while he did these things wasn't always going to be viable, wrote a new entry that Happy simply would not question Natsu's actions with the Note, and assist him in any way he asked regarding it.

Once dressed, Lucy said, "So, where are we going Master?"

"Nowhere in particular. Just feel like taking a walk with a pretty girl practically hanging off my arm, maybe get something to eat at a vendor," he grinned. "Oh, but no calling me Master in public, we don't need that kind of attention. Just go with Natsu."

"Alright then Natsu," she tried. It didn't feel quite right on her tongue like this, but she would happily call him anything he said, regardless of her instinct to call him Master or any variation.

They walked out, Lucy hugging his arm, and Happy started walking with them. "Why didn't she throw you out?" he asked curiously. Natsu just shrugged as if he didn't know, and Happy let it go.