Oh, now this is strange. This is far, far too strange. Sparrow as an object of desire, of temptation- that he's (sort of) come to terms with, but Sparrow being... affectionate? The kiss the pirate presses to his lips is gentle, tender, the sort of kiss one might give a lover while falling asleep beside him. It's the sort of kiss James would have given Elizabeth, were he given the chance. That... he doens't know what to think of that, and he looks at Sparrow with troubled eyes.

The mention of fair trade makes him smile, though, and gives him an idea. It reminds him first and foremost of the letters they had exchanged while he was hunting Sparrow, and they had agreed (grudgingly, at least on his part) on a truth for a truth- one answer for another. If Sparrow wants fair trade here, that's something he can work with. He pulls away slightly, still discomfited by the pirate's sudden gentleness.

'Fair trade? Very well. Shall we adhere to the rules established in our previous correspondance? An answer for an answer? You tell me- truthfully- why you want me as your first mate, and I'll tell you...'

He trails off, allowing Sparrow to fill in the blank at the end of that sentence.