The softness in Norrinton's voice, the consideration on his face, the use of his proper name -- Jack doesn't understand it. It's a strange move to make, to suddenly offer gentleness instead of taunting or teasing or seduction. It doesn't follow with what he originally expected of Norrington, which was either dismissal or more wariness. And instead it is Norrington asking him what he wants.

What does he want? Well, he wants freedom. He wants his ship. He wants the man in front of him. And he wants to know why the man in front of him wants him, other than the obvious, numerous reasons. Who could not want Captain Jack Sparrow? But what leverage does it give Norrington? Would good could come of seducing a pirate for a Navy man? It isn't Jack hunting him.

But that isn't an answer he can form in words. Doesn't think that's the answer Norrington wants from him. Really has no idea what Norrington wants from him. So the only thing to do is take what he can while he can and hopes this gentleness thing can work both ways.

"Fair trade," Jack answers, and then leans forward to kiss Norrington softly, tenderly for a moment before pulling back.

A kiss, after all, is part of fair trade as far as Jack is concerned.