Bruce turns his laugh into a cough, hidden by the back of his hand, then grins at X. Moments like this right here? Are why she's interesting.

'Just a couple of bottles of water please, Alfred. Thanks. We'll be in the gym.'

The butler inclines his head politely at them, practically radiating amusement from his eyes, and turns on his heel. Bruce looks at X silently for a moment, still grinning, then extends a hand to one of the doors leading off the entrance.

'The gym's that way. Unless you want a tour first?'

He's willing to bet that this house, that practically any girl in Gotham would give an arm to be inside? Holds no interest for her whatsoever.