Move her hand onto your thigh.
From Create Your Own Story
You keep an eye on Adam, who seems to be glued to the movie, as you covertly move Kara's hand onto your thigh. The room is very dark, save for the glow of the television screen. After a rather gory scene, Kara turns into your side and you rub your hand soothingly on her back. However, you breathe harshly when you feel Kara's hand rubbing your clothed crotch to full hardness.
Your eyes nervously jump to Adam, who seems to be engrossed in the movie. Kara unzips your fly, reaches into your pants, and grabs your rock hard cock.
"Holy shit!" she whispers under her breath. Your cock is huge, and Kara's small fingers are unable to fit around your girth.
She rubs the swollen mushroom head with her thumb and a small sigh escapes your lips. You can feel your gooey precum wetting her fingers. In the darkness, you can see the little minx grin wickedly as she continues to pump your thick erection.
You decide to go balls out and reach over to touch Kara's breast. At first you grope it hesitantly, but then you rub it with a firmness that makes Kara moan. Thankfully, Adam doesn't hear it over the screams in the movie. The movie is almost over and you whisper this to Kara. The girl lets out a frustrated sigh and removes her hand from your pants. Kara announces to you both that she's going to her room. She gives you a sly smile and jerks her head ever-so-slightly to indicate that you should follow her. Adam isn't paying attention to any of your actions -- he's still lost in the movie. He just nods his head at Kara before returning his attention to the TV. Adam has always been sort of a pansy and you can see that he's terrified of what's happening on screen.
You wait for a few seconds before standing up yourself and tell Adam that you need to go to the bathroom.