He merely grins at the accusation that he's showing off. Well, can you blame him? He isn't lying though, just bragging. Of course, William was just a boy when he came along with him and Charley. And he had still drunk Charley under the table. Literally.

The Doctor nods at the second bit. "I try to pace it for what they prefer," he answers. It's not uncommon for him to save the universe once or twice while his companions are asleep or taking a bath or something. And sometimes he needs a breather too, of course. "And the TARDIS is very good at taking care of everyone's needs."