[Nico gives him a flat look before he looks away with a hint of a blush.] My mother was the daughter of a diplomat. She taught me and Bianca how to dance. You know, ballroom stuff. So no, I wouldn't need to stand on your feet. [Because he already knows how to dance and there isn't that much of a height difference between them that Will would need to bend over.

It's not a complete and forever 'no' but it's not an easy 'yes' either. If Will seriously did ask him to dance, he would have to deal with more than a few flat looks and have to wheedle Nico about it for a good while before he'd finally give in.]