Yawn&Arm-around-shoulder move

You watch the movie for a few more minutes, squeezing her hand gently when something spooky happens on screen.

You decide you've waited long enough, and determine that the "Yawn&Slide" is the best move for the current scenario.

You pretend to yawn, but you don't make too big a fuss about it. The people on screen are just sitting in a closet whimpering, anyway. There's not much to occupy people's thoughts.

You stretch, and slowly slide your arm around her shoulders. You slowly pull her closer, and she instinctively snuggles into your chest.