Sophie wants to fuck you.

"Wait," Sophie says, "I really want to see what it would feel like to have your...penis inside me. Is that ok, Diana?"

Diana, watching from a distance, nods. "Whatever will help you get the most out of this class," she answers.

Kuniko takes you out of her mouth, as you turn towards Sophie. She slowly pulls her panties down.

"I can help," Kuniko says, stepping behind Sophie. She guides the redhead to be standing above you with you seated in a chair.

Kuniko bends down and gently guides your cock into Sophie's pussy, and Sophie gasps as it slides in. She's tight and wet, and it feels amazing. You start moving in and out, slowly, and feel Sophie's breathing start to speed up.

Kuniko rests her hand supportively on Sophie's hips as the redhead slides up and down along your cock. Her small breasts bounce slightly as she moans from the pleasure of this new experience. You lean forward and take her left nipple in your mouth and she lets out a louder moan as you suck on it gently.

"This is so hot," Sophie moans, "I've never felt this...full before. And it feels...amazing!"

She bounces up and down faster and faster, as you begin to thrust deeper and harder. You can feel her pussy squeezing your cock as you push in and out.

"Oh my god I'm going to cum..." Sophie moans.

Diana, on an impulse, quickly steps forward and firmly squeezes Sophie's other nipple. "Class, we talked about the female orgasm last week, but now you get to see it live."

Sophie lets out a wail as she cums, her pussy clenching down on your cock as she throws her head back. She's so small, you're far enough down that you brush her lips with your own. She shudders for several moments, with you still inside her. Kuniko and Diana watch her with a kind of fascination.

Sophie's breathing is still heavy, and she looks down at you with a dazed expression on her face.

As she comes down from her orgasm, Kuniko helps you lift Sophie up and off your cock, and then you pull out.

The class claps as Sophie collects herself. She looks around, surprised by the applause.

"Sorry," Diana says, "But that was absolutely amazing. It was a very special opportunity to see an orgasm from a privileged point of view. Thank you very much."

Sophie smiles and waves at the class, looking gratefully at you.

You feel like you could lay back and rest right now, but it might be a bit interesting to see what Diana and Kuniko do next. You guess you're going to find out.