Sit on my lap

"You will just have to sit on my lap," he says pushing his chair back from his desk "come on now, hurry up. I won't have you disrupting the class."

Reluctantly you perch on his knee feeling more than a little ridiculous as he begins the lesson. As usual, the lesson is pretty dull but that is not why you are finding it hard to pay attention. As he drones on he puts his hand around your waist and almost absently pulls you deeper into his lap. You find yourself leaning against his broad chest. You try to adjust your position but he holds you where you are. He continues reeling off a list of names and dates to the class as his hand moves from your waist to your hip to your thigh. He doesn't break his stride as his hand runs up your smooth thigh, pulling your legs apart allowing him to stroke the smooth fabric of your panties. You feel your face starting to heat up as he fondles your boi clit and balls through the lacey material. Your blush intensifies as your classmates begin to notice what he is doing to you under the desk. Despite your embarrassment, you can feel yourself stiffen as he strokes you. His touch growing firmer as his hand moves inside your panties and he starts to properly jerk you off. You can't help groaning as his strong hand wraps around you. A wave of sniggering and excited whispers ripple through the class as you squirm in his lap. You only succeed in working his growing erection into the crack of your ass. You can feel the heat of him pressing against you even through his pants. You are **** to escape but you know you will be severely punished if you try to make him stop. His composure starts to slip as he interrupts himself to kiss your neck and cheek. You let out a surprised squeak at the unexpected intimacy as he brushes back your long hair to nibble your earlobe.

"Oh god" you sigh not even sure yourself if you mean it as a protest or an invitation to continue.

Finally, he gives up on any pretence of teaching the class. He stands up without warning, spilling you from his lap and sending you sprawling across his desk. Before you can recover he has yanked your panties down and is easing his thick cock inside you. Of all the butt fuckings you have received today this is by far the gentlest, the most considerate, you could even say tender. Even so, you still feel utterly violated as he stretches your ass far beyond what you thought was possible. Just a few feet away your classmate, many of whom you considered friends yesterday seem happy to simply watch as you are publicly fucked.

You screw your eyes shut to avoid looking at them untiĺ you feel him twitch inside you and grunt as he loses his load. You remain sprawled across his desk panting for breath while his cum leaks out of you as the bell rings signalling the end of the lesson. Calmly he pulls up his pants and gives out homework assignments before dismissing the class. As they file out he gives you an affectionate pat on the rump.

"Good girl," he says with genuine warmth "keep that kind of performance up and you'll go far."

You nod, too dazed to manage a more coherent response. Then you pull yourself together and stagger out into the hall...