The blonde girl volunteers.

The blonde girl in the front of the room raises her hand.

"Yes, Grace?" Diana responds.

"I'd like to try oral sex before he orgasms," Grace says, "I feel like that's one of the most important parts of this class, from what I understand."

"Great," Diana breathes, looking relieved, "Why don't you come up here and try, Grace. Thanks for volunteering."

Samantha grinds herself up against you a few more times as Grace pulls her chair up to you. Then, she reaches down, grabs your hip, and pivots you so your hard cock is available for the cute blonde. However, she keeps her breast firmly in your hand, and rests her head against your shoulder as you both look down at Grace.

Grace takes your cock in her left hand, pencil poised in her right hand, ready to take notes on her notepad. Her lips are full, shiny with a recent coating of lip gloss. Yet, her demeanor is very serious. She's not trying to seduce you, she's trying to learn.

"What's the first thing I should do?" She asks Diana.

"Why don't you just play with different ways of stimulating him with your mouth and tongue?" Diana responds, "For example, you could put his whole shaft in your mouth to stimulate everything at the same time, or you could lick him where his shaft meets his head, and see how he responds differently. You could also just ask him what he wants."

Grace seems lost in thought for a moment, and then Samantha tilts head head up and gives your neck a little nibble. You feel a rush of excitement down your spine and without thinking you thrust your cock forward against Grace's firm grip.

Taking that as a cue to begin, Grace leans down and softly wraps her lips around the tip of your penis. They are surprisingly cool and gentle, and you want nothing more than to slide all the way into her mouth. Rather than taking you in, though, Grace begins slowly, warmly licking your cock-head. It feels incredible, a swirling mix of cool and warm pleasure.

As you moan slightly, Samantha runs her hand up your back and starts kissing the side of your neck. Grace takes even more of you into her mouth, and starts licking your more firmly and thoroughly. Now she's also going back and forth a little, giving you the sensation of going in and out of her amazing, soft lips.

The pleasure of her cool, soft lips and hot, firm tongue already has you gritting your teeth with pleasure. You push yourself against her, and she allows your deeper into her mouth, this time sucking your whole shaft like a popsicle. You feel the pleasure build almost to a breaking point in the tip of your cock as you near the point of no return.