Really, Riku knew he was getting off lightly. It was a lot harder to be the one taking hours, than just observing. Riku felt mentally and physically exhausted, and it was only due to the need to keep appearances that he didn't visibly drag himself back to his room.
He DID drag himself over to the bed though, once he had shut the door, shedding layers of his clothing the whole way until he was just left in a single layer.
The Prince looked like he was still asleep... not redressed from when Riku had pulled his clothes off earlier. But right now, Riku couldn't really be pressed to care, and climbed under the covers to snuggle up alongside the Prince, hugging him to his chest.