Can I fuck her, please?

"Diana, would it interrupt the flow of your class if I had sex with Kuniko, right now?" You ask, looking lustfully at Kuniko's bare body as she sits at her desk.

"Oh, I wouldn't recommend that. There's still an hour left in class, and we're not done with the demonstration. I think we should hold off for now."

"Oh, ok," you say, feeling a little disappointed, "but I think I'm going to have a hard time paying attention to your demonstration with Kuniko here."

"That's part of why I'm here," Diana says, smiling, "I'll do my best to make it worth your while." She steps closer to you, and her eyes move down to your rock-hard cock. She looks tempted to reach out, but she doesn't, instead moving back to her whiteboard.

Diana begins to lecture to the class, talking about your anatomy and how it works...and you try to pay attention, but you can't get Kuniko's naked body out of your mind. You remember how pretty her pussy looked. You wonder if her pussy is wet. You wonder if there's any way you can rub your cock against her pussy under your desk. Your mind wanders and you begin to imagine being inside Kuniko's pussy.

Diana has moved onto the next slide on the whiteboard, but you can't keep your eyes off of Kuniko.

Diana says, "Joe, could you help me out with this illustration? Hold your hand like this." You look up and realize that she's drawing a diagram of the female reproductive system on the board.

You move to the board to help her. She turns to face the class, standing slightly in front of you and puts her hand on the small of your back, looking back at you. As she points to the parts of the diagram she says, "This is the vagina..."

She looks up at you, and her eyes move down to your crotch, and your erect member. You can't help it any more. You move your hips forward and rub your cock against the side of Diana's leg, just to get that initial jolt of pleasure you'd been yearning for. She looks down, startled and then puts her hand on your crotch, feeling your erection. She looks back up at you, looking into your eyes and smiling.

"Ok, class, I made a mistake. We got Joe all hard by having Kuniko strip for him, but then I went into lecture mode. Now look how eager he is to have some pleasure! Joe, would it be awkward if I pleasured you with my hand for the class?"

"No," you say eagerly, "it's fine."

"I'd invite Kuniko to do it, but Joe would probably come too fast, don't you think?" she asks, looking at the class.

The class grins, and someone says, "yes."

Diana looks in Kuniko's direction and calls out to her. "Kuniko, would you mind standing up, and facing the class while Joe gets his pleasure?"

Kuniko gets out of her seat. She's looking nervous, but she stands up anyway. You can see that her pussy is a bit wet. She steps closer to you so you can admire her breasts.

Diana watches you admire Kuniko for a moment, and then begins gently pumping your cock up and down. You moan.