[He's giving him the rest of the chocolate as a sort of apology for prying too hard. He does want to keep pushing at those old beliefs Vanitas has, but he also doesn't want to cross a line. And also because Vanitas probably needs it more than he does; he's had his share, and if he needs more he can bug Sora for some.]

[At those words, Roxas chuckles, offering a weak shrug.]

Well, he is my Somebody, so I guess some of his traits probably did rub off on me. But he and I are still our own people; he's got his heart, and I've got mine. Me being born from his heart doesn't change that fact.

Though, I'd like to think I have a bit more common sense than he does. [Yes, he's making a joke at Sora's expense.]