Something felt a hair off to Mina, but she couldn't put her finger on it. And it wasn't about geometry or physics. It was in the muscles of his face which were, admittedly, rather under close scrutiny at the moment.

Slowly, she drew back out of the kiss, watching the way that the water ran down his cheeks. Sometimes, she wished she'd taken the time to cultivate better skills at reading people. There were always so many things going on under people's surfaces. And the Doctor had one hell of a veneer.

"What is it?" she asked, settling on the direct approach.