Carla's Vibrator.

Katherine is holding in her hand a purple vibrator that looks about eight inches long. The base of the fake cock has little round studs and the length is ribbed to the bulbous tip. Katherine can’t take her eyes off the thing as she seems shocked by the discovery. “Cool a vibrator,” you say, “Carla must have some fun with that.”
“Carla! Really!” Katherine responds with amazement.
“Yeah. Why else would she have one?” you say kind of surprised by Kat’s reaction. It’s like she’s... “Don’t tell me you’ve never used one of these before.”
“No, but I’ve always want...” she stops herself before she can say anything else. If it wasn’t for her surprise at what she’s just discovered you’re sure she never would have let that slip out. You could turn this into an excellent situation if you’re careful.
“Here I’ll show you how to turn it on,” you say taking in from her hands. You tilt it upside down and find a small switch. You flick it on and feel the vibrations as it hums. “Feel this.” You press the tip against Katherine's hand. Her face makes a startled jump at the sensation.
“It feels strange,” she says as her nose turns up into a little scowl.

You can gather that Katherine is turned on by the finding but is pretending to be disinterested with you here. You can see that her nipples have become erect and are pressing against the flimsy material of her top. You decide to be bold as you have to quickly overcome any reservations she may have. You quickly move the vibrator from her hand and press the end against her erect nip. Katherine lets out a gasp at the sudden feeling. Her eyes open wide as she says, “My goodness that feels... great.” You move the tip from one nipple and press it against the other. She again lets out a gasp and this time bites her lips.
“Do you want me to show you what it can really do?” you ask Katherine. She doesn’t answer as indecision prevents her from saying anything.

You decide to make the decision for her, gently take hold of her shoulders, and guide her back onto Carla’s bed. Her head rests upon the pillow as you lie beside her. You trace the tip of the vibrator around the bottom of her neck, moving it from one shoulder to the other. With the other hand, you reach out and slide the strap of her dress while you follow behind it with the vibrator. You trace a path along her naked skin and once again bring it in contact with her nipple. This time without any fabric in the way. Katherine closes her eyes and moans as you play around with her nipple and the vibrator. She looks to be enjoying herself so you switch position so you’re sitting beside her feet. You remove her high-heels and fold her dress up so that her knees are uncovered. You touch the vibrator against the inside of her leg and very slowly start to move it higher. Your hand disappears underneath her clothing.

You must be only a few inches away from her panties when Katherine lifts her head and looks at you.