Well Sora was going to believe it was partially his fault all he wanted.
"Shhh," Sora replied, placing a kiss to the top of Riku's head. "Don't worry about it, Riku. You'll make me want to kill her more than I already do. Just rest." He knew it might help to make him take something, but Riku always whined when he had to do that, so he didn't suggest it and just held him close, rubbing the back of his neck a little, hoping it helped.