"I never said it was at that picnic." She was 100% trying to suggest they have a picnic where they had outdoor sex. She can never convince him otherwise. That was the implication and that was the suggestion. Full Stop.

There was a part of him that wondered if he should tell her just how close she had gotten. How close he was to breaking his own desire to keep from doing anything until she had caught up to him. Still, it seemed as if that information would have only given her ammunition to use later. So instead he suggested something else. "Maybe I should go back to that."