Pulls up her skirt

You watch from the corner of your eye as Sabrina begins to slowly hike up her skirt. Its already so short that a small tug is all it takes to almost reveal her pussy. She opens her legs a bit and then starts to slowly shake her legs back and forth, trying to draw the man's attention to the movement.

The man notices the movement and can't help but look over, his eyes going wide as he looks down and sees Sabrina's barely covered legs, the skirt's shadow all that is preventing him from seeing her exposed lower lips. He glances up at Sabrina's face but she's staring at the screen, and he takes the opportunity to sneak another peek. This time the skirt has ridden up even farther, almost completely under her ass. Her pussy is clearly exposed and her legs are spread just wide enough that he can get a clear look. He gulps and you are sure he's starting to get a semi from the teenage girl exposed next to him.

The movies progresses a bit further, now almost fifteen minutes in. You watch as Sabrina gives you a look, and you motion her on. Her right hand, which was resting on the armrest, slowly starts to move, dropping between her legs until her fingers are over her folds. She starts to slowly move her fingers in circular motions and her eyes close at the feeling.

The man is barely watching the movie anymore, although he's certainly trying to make it look like he is. His head is clearly tilted in Sabrina's direction, trying his best not to alert his wife or make it obvious to Sabrina that he is watching. You sneak a glance over as well and even in the darkness, you can tell Sabrina's pussy is wet and glistening. She's tapped into her nympho side now, whether she knows it yet or not, and can't help but get excited when she starts to play with herself.