[Drawing attention to it makes her smile take on a slightly self-conscious edge, but she doesn't drop it.]

I don't know how to swim, I'm afraid, but even just a chance to dip my feet in the water would be lovely, if you're sure I wouldn't be intruding. Is the TARDIS able to keep everything cool, then, that you didn't notice? [She sounds a little wistful.] Or is it just this warm all the time where you're from?