[ Nanami is surprised by the dismissal because, well, that wasn't his plan at all. He still plans to stay until Yuji falls asleep but he also worries now that he's be intruding in a way Yuji doesn't want. His mouth pulls into a thin line as he considers it.

Well, he might as well ask, to make sure they're both clear. ]

I was thinking of staying until you fell asleep as I don't want to leave you alone. But if you don't want me to, I can leave now instead.

[ He leaves it open ended from there because he doesn't want to pressure Yuji. It's up to him, if he desires the comfort or not. He just doesn't want him to feel alone in this. ]