In this picture, I've tried similar technique. First, we look for a light source. At the location we were at, there was a single light source from above, which is a light pool. Second, how can we light up the subject? We didn't want to use off camera flash because that might require too much tweaking. So we had a handheld flashlight and a small 20W Sony video light. Using both of these, we aim the light accordingly. The handheld was at a 45 degree angle to the right of the camera focus on the female face with a feather touch on the male face. The Sony video light was 45 degree angle to the left of the camera focus on the female face.
With some magic pixie dust, a few chanting pray, we have a shot as you see here. Of the 7 shots tried, this is the one I liked most. I hope you will like it too. Here are a few others from the same night while trying out shots.