"Er. Sure, I suppose." The Doctor wrinkled his nose feeling out of his element in ways he definitely didn't like. But on the other hand the way his hearts fluttered... There was something about this all that made him feel... Feel young, really. Not all that unpleasant, all in all. Maybe Jack made him think of Rose or maybe it really was just Jack. Stranger things had happened. Not so strange at all, all things considered.

"We can do a sleepover. Maybe you'll get some actual sleep that way." He wasn't an idiot. He knew what Jack intended with the question. But, well. He really didn't know about that.