The Doctor tried not to think about the last Christmas they spent together. The one where he very nearly lost her, hell, lost the whole universe to his greediness. It was also the first time he told her he loved her, another reason to be rather embarrassed about the time. He was very good at repressing his emotions. Sharing them was a difficulty.

"What are you talking about? Of course I won't." Then again, as he spoke the crystals did seem to be getting far too hot in his hands. He was right, though! She didn't know what she was talking about.