Would Vash bring up something like that? He had to admit that he didn't know. Anyone else surely would.
But then, if Vash was anyone else it wouldn't be an issue, would it?
"I'm fine," he said, continuing to smoke out of the window. "You said you didn't want to deal with the smoke. Are you going to eat the donuts, or not?" He had woken up alone, after all. And if anything more had happened between them... maybe it was best that he didn't know?