Alastor had been scrutinizing Lucifer's reaction. A slight hesitation, almost confused, but by the change in pace more than the dance itself. Oh, this was far from the constrained, elegant ballet moves aristocrats had elected as the superior art, especially since it had been designed by a king.
This was a difficult, freeing pattern of steps and kicks meant to bring joy and community in challenge. A dance created by the people, something many would deem "messy", "plebeian", or even "vulgar".
Lucifer had seemed surprised, not rebucked. He was already learning some steps, and keeping up quite well indeed. To him, it seemed the dance mattered more than the dancers. He could enjoy art whether it came from Sinners, or humans once considered as "lower than".
Alastor smiled, twirled, and leaned in to press one single finger on Lucifer's almost non-existent nose. "To say I expected your old ass to evaporate into a heap of dust!" he teased as his finger pushed, then released the man's face.
With another swirl, he freed himself from his stripped coat, flapped his tail a few times to stretch the weight of fabric off it, and turned around while rolling up his sleeves.
"Come on, chap, I'll show you the basics!"
The band lowered the tempo ever-so-slightly, switching to an easier tune to follow, and Alastor faced the smaller man while stepping back in rhythm. He was showing much less teeth, but oddly much more smile.
"Now... Hop down front then doodle back... Mooch to your left —hips first, you stiffish little imp—"
Then shuffle forward with both feet— Mooch to the right. Hands on your hips! And do the mess around...
"Now, break a leg! No, not really, that just means bend it up and— yes! How quaint, if you keep at it, you might even pass at somewhat acceptable!"