She left the sheet alone, then, so he wouldn't get chilly. Apparently the Doctor wanted to take his time, which was perfectly fine with her. She wasn't entirely sure if it would make her less nervous or more, but it was better than just plowing on, she supposed.
Besides, that grin! How could anyone say 'no' to that? She laughed, blushing. How did she ever get so lucky? "Right. Wouldn't want to get cold."
She ran her hand through his hair as he shifted over her, her nails raking lightly along his earlobes.