Tamp it down rather than let it out to play. As in, the complete opposite of what he's doing.
At least they can dance. It might not really help with that tamping down the longing thing, but it does take the edge off by changing the emphasis. Because, after all, Kitty can dance. Well enough to follow his lead as he guides her through the sways and twirls of a fairly comprehensive musical theatre dance, just because he can.