[Roxas ducks his head for a moment, trying to think of a good response to that question. In the end he goes for honesty. It's easiest.]

I don't know. I'm a Soulless. I don't have anywhere to go. I don't have a-- a home.

[He shakes his head slowly, then looks up at Riku.]

I... want to help Sora. How do I do that?