Riku glanced lazily over at the door when it opened, but he didn't move, didn't make to move the Prince to a 'chaperon appropriate' distance. But the guard didn't comment, and Riku didn't move, and so when they were left along, Riku went right back to what he was doing.
From the Prince's cheek, his trailed his fingertips down the Prince's neck, and over his shoulder. The Prince was using him as a pillow, so Riku ran his hand over the Prince's arm, and then up over his back. He could feel the muscles in the Prince's body shift ever so slightly. His love was a very strong boy, even if he didn't necessarily look it.