She's not done yet.

"No, I'm still learning..." Sophia says, half to Diana, half to herself, as she continues playing with her nipple, a little more vigorously.

As you look down at her lightly freckled face, there's something perfect about her, eyes calm yet excited as she gazes at your throbbing cock. You wish you could put your lips over her hard nipple and explore its salty flavor your tongue, but that probably wouldn't be professional.

She shifts position and reaches downwards with her other hand, beginning to stroke the front of her white panties. Her lips gently part in pleasure as she runs her fingers up the soft fabric.

"You can touch yourself," you say to her, "I'm touching myself, and it feels great."

She smiles at that, and then takes a deep breath, sliding her hand underneath the fabric of her panties. Instantly her eyes shut in quiet rapture and she makes a soft gasp as she touches herself.

You watch her stroke herself, faster and faster, eyes mostly closed now except occasionally checking to make sure you're still right in front of her, still stroking your own cock. She's pinching her nipple now, and starting to wiggle in her seat a little, and her breaths are coming fast and faster, with little gasps every two or three exhales.

Watching her petite but very womanly body writhe beneath you is about the sexiest thing you've ever seen, and hearing her moans of pleasure as she gets closer to climax takes you to the edge. Your balls start to clench, but you don't want to blow till she comes.

Slowing down for just a moment, you watch her face closely until she holds her breath for a moment, mouth wide, and then she starts screaming, small, short gasps at first, but getting longer as she arches her back, "ahh, ahhhhh, AHH, AAHHH"

As she orgasms you pump yourself hard, gritting your teeth as a spike of tight pleasure runs from your balls up your spine. Seeing that you're about to begin to spray gouts of sperm, Diana, protective teacher that she is, sticks her hand between Sophia and your cock.

You start blasting semen all over your friend's hand as you're rocked in your own blinding waves of pleasure. Listening to Sophia's moans and noticing the wry smile on Diana's face, you think to yourself that as far as cock blocks go, this one wasn't that bad.

Almost as an afterthought, Diana wraps her cum-soaked hand around your cock and gives you a couple more pumps. You gasp in startled pleasure as you ejaculate another, unexpected load onto the floor.

"You make a great sex-ed model," she whispers to you.

The End.