The woman had just shown up.
Martha had never seen the Doctor that happy. He was stuck in a state of perpetual giddiness, and the woman — Rose — was much the same. One of the first things Martha had noticed about Rose was her tongue stuck between her teeth in a bright smile. The second had been that same tongue in the Doctor’s mouth. This development had surprised them as much as her, but obviously neither did mind.
Since then they had been on edge, constantly talking, constantly touching. But now they were finally still, smiling, peacefully curled around each other.