Jack hesitates for a moment, not sure how well he'll handle someone touching him from behind. After a moment he nods. He can trust Beckett, and this can be...a test. An experiment, to see just how long he can take it.

Besides, he knows he could probably use it, and there's no fucking way he's letting a stranger--no matter how professional--get into his personal space.

"Would it be easier if I sat down?" Jack asks, taking a rather large sip of his drink to try and settle his nerves.