Look for some lubrication

Rubbing your fingers together, you frown at the lack of moisture. It's unsurprising after all—this is just her day job and nothing unusual has happened according to her perception. You could have tried to get her moist the old fashioned way but you decide that you might as well live a little and **** this ability. You spot what you need in the front row.

She has straight blonde hair down to her shoulders. It falls nicely onto her scarf which she still hasn't taken off, probably because it matches her blue long sleeve sweater. Leaving the lecturer in her bend over position you almost skip over to her, your thick erection refusing to diminish as it slaps about. She is writing down notes diligently.

"No time for that now," you say to her as you grasp her by the wrist and pull her up. As you hastily yank her back to the front, she tries to continue write down notes with her spare hand until she is out of range of her notepad. Once back in position next to the lecturer, still in her bent over "fuck me" pose and muffling her sounds to the audience, you grab the girl by the shoulders and push her down. Her gaze never leaves her teacher as she sinks down under your weight. Pen still in hand but with nothing to do with it, her arms hang limply at her sides. She comes to rest on the floor sitting on her butt, her legs forward and flat on the floor but bending at the knee, outwards to the side in different directions.

Grabbing her jaw with one hand you get her to look at you, which she does uncaringly. Pulling her mouth open, you shove your dick in and roll it around a bit from cheek to cheek. As you do so, her eyes look into your torso blandly. You pull out with a pop, a line of spit joining her lips to your cock. You maneuver behind the teacher, still trying to speak up past the blockage in her mouth, and line up your cock head with her slit and push in. It goes in fairly easily, although you do have to push her further forward to get more penetration. Moving in and out, you feel her warmth as her pussy unconsciously reflexes around the invader. Spit does not got a long way but you can feel that the lecturer is responding on her own now that you've gotten her pussy getting wet as it receives some action. The sloppy sounds of sex start to fill the room and slowly grow louder as you pick up pace and start to drill your play thing.

You look down at your unwitting helper just sitting there oblivious, hands by her sides. You don't know how you manage it, but you pull out briefly despite the wonderful feelings. All forethought of being gentle gone from your mind, you grab the girl by the hair and pull her head back. You cram your wet member back into her orifice as her mouth lulls briefly open from your treatment. A combination of precum, her own spit and her teacher's juices are mixed around and then brought forth from her lips as you pull out again. The bottom half of her face is now shiny with a vile aggregation of fluids from various sources, some of it dripping down to stain her once immaculate sweater. You re-enter the teacher and get your rhythm going again as you notice the sounds of her muted talking becoming shorter as her breathing quickens. You can feel she is really getting excited now—or at least, her body is, judging by the lubrication on your dick as you pull out again.

You move over to the girl and perform the same ordeal. Forcing your member in, swilling around and pulling out, you use her head as a personal lube dispenser. Like a writer dipping his quill in an ink pot to continue writing, you sustain this method for some time. All the while, the student is getting more and more defiled, yet she sits patently, hands by her side with a look of slight concentration as she listens to the teachers mumblings.

Ramming home, you feel yourself cumming. You grab the teacher's hair and hold on as you thrust one final time, her hair clamp finally coming loose as her long bushy curls cascade about her face. You pull out and admire your cum fountain as it drips out of her used hole. You take in the sight of the girl next to you, completely awash with fluids of all kinds. Tears streaming from her bored eyes, down her face smudging her make-up and bubbles of god knows what popping gently on her lips as she breaths out calmly. Feeling like you owe her something for participating, you reach around and grab the teachers glasses from her face. You carefully insert it into her used cunt, giving it a second and then pull them out. You place them on the student and give her a pat on the head as you walk by. It looks like this seminar is coming to an end, so the only question now is where to next?