Sora didn't want to talk about it like adults. More like he didn't want to argue about it. Because selfish or not, if they talked about it, Sora would be ordering Riku to stop working and doing these things, and that would just make Riku angry and upset, Sora was sure. Apparently there were some things that he just didn't understand. It was like he was fighting what Sora always hated, responsibility. He seemed to like the freedom part of being with the Prince but didn't fully want to accept the responsibility. Which must be why he was running away. Sora really didn't blame him, he just wished he had realized it before Sora fell so in love with him.
"No," Sora called back, curled up in the warm bath. It made his head and body feel much, much better. Although he didn't really feel any better besides actually being able to breathe. He just needed...time. To be sad on his own.