Sora sat and ate quietly, missing Riku. Not that he couldn't go a day without Riku, but he was just very much reminded of him right now and he wanted to be with him. They'd need to talk soon. Sora finished the tea and lay back down, falling into a light napping doze. He could ask for Riku as soon as he was back to him room.
Lord Strife came to check on Riku after breakfast when he realized that Riku did not appear there. Then again, he supposed that Riku might not feel comfortable at the castle. Cloud asked for a breakfast to be brought to the Prince's rooms. Yes, he realized the Prince wasn't there. That wasn't the point.
He came to Riku's room, hoping that at least he hadn't wandered off since he didn't come to breakfast. He knocked and waited.