Sorry this is so late! I was out of town and just got home. Hopefully the fluuuuuffffff will make up for it ;)
The musicians in the corner of the grandly decorated room settle in, and the strains of Valses Nobles et Sentimentales carry out into the air. Sherlock's face lights up across the table, as he begins conducting with his fingers. John grins at him, caught up in the moment, obviously enjoying himself for the first time all evening.
"Like this music?"
"Mummy used to play it for us when we were younger. Ravel was a bit obsessed with waltzes, but he did them so well."
"Why don't you find someone to dance with? I bet you had lessons when you were little."
Sherlock smiles smugly. "I did indeed. Care to join me?"
"What? We can't! I'm a man!"
"Oh dear, nobody informed me." Sherlock pretends to look shocked.
"You know what I mean, Sherlock. Two men can't waltz together. Besides, who would lead?"
"Nonsense. Historically, men have danced together for centuries. And I would, clearly. I know what I'm doing, and I'm taller."
John takes a swig of his drink, good old liquid courage, and stands up, holding his hand out to Sherlock.
"Alright then, you're on."
Smiling fondly, Sherlock straightens John's form and grabs him in the frame of his arms. Ignoring the scandalised looks from some of the more old-fashioned guests, Sherlock deftly and elegantly guides John across the ballroom.