Everything looked dark, but when I saw the restaurant window it was a shot that needed taking.
I set up 2x Phottix Indra on the couple inside, flash metered them dialed in the ambient for outside to taste
I asked the couple to have a slow dance on the spot, got some music going..
D5, 70-200
Phottix Indra
Edit in C1, keystoned, as I was shooting lower than the window. clean up in Photoshop.