Sora didn't notice too much, but he did open his eyes and look up a little when Riku moved. Was he blushing? Awwwwwww. Sora wondered if he should not have suggested it. For his teasing, Riku was surprisingly shy at times. He adored that about him, though.
Sora smiled, a little silly and a little pink, and rubbed his cheek against Riku's shirt a little. "I just..." Well, he had no real reason, other than he loved Riku and thought it would be lovely. "I would repay the favor, of course." He would come wash Riku's back too.