Invite her to sit next to you
From Create Your Own Story
You tell her to come over next to you, and as she walks over your let her get a good look at your dick. She stares at it even as she clambers into your bed and lays next to you. You tell her to put her head on your chest and to just watch. She looks at you for a moment, but as soon as you start stroking your cock her eyes are transfixed on your erection. You cup her bottom as you jerk off and she doesn't even notice, she's mesmerized by your dick.
You grunt in pleasure, and she looks up at you with worry in her eyes. "Does it hurt?"