The knock startled John. He was the only one in the house, for the moment, and certainly wasn't expecting the knock. Maybe someone needed the bathroom. Or they just hadn't gone all the way back yet.

He opened the door and smiled. "Hello?" It took him a moment to recognize that he didn't recognize her. "Oh! You're here for the party?" He grinned.

Gathering himself up, he stepped out the door and gestured that she come with him the rest of the way around the house and to the party proper.