Tim smiled, detective skills kicking in belatedly. There was nothing suspicious about her being nervous -- she liked him. Elevated pulse, rapid-eye movements, flushed cheeks, but she wasn't looking away the way people with something to hide did -- that made sense. It wasn't a surprise, exactly. In fact... hadn't he already guessed?

He realized he was still smiling, that the symptoms he diagnosed held true for himself as well, and just as he closed the last bit of distance between them, his eyes widened in realization.

"Mistletoe," he said, and kissed her.