He goes to her, sitting as asked. There is less of the ghostly death in his skin tone, gone from pallid to a more usual pale if only thanks to the warmth of the shower. A wine probably isn't a bad idea; he'll likely transfigure himself a glass of it before the night is out and sleep through 'til morning with exception to the fog-effect dreams he only barely realises he has.

Fighting monsters and navigating conversation with actual people, Muggle or not, is exhausting.