The class finishes... and so does one of the models

Jessica was in a state of ecstasy as she continued to be fucked in front of the entire class.

"I think I'm about to cum!" she whispered to James.

"Me too!" he replied, slowing down his thrusts.

"No no no, don't stop!" Jessica whispered back harshly, causing him to speed up again.

As if Emily had heard the conversation, she immediately stood up and dashed to the front of the lecture theatre to address the class once more. Jessica felt James pull out of her and return to the position they were originally supposed to be in, frozen in place.

"Aaannd that's all we have time for today, class!" said Emily, slightly franticly, "I know it's slightly earlier than usual, but that's just the way things go sometimes."

As the confused looking class members gathered their things and prepared to leave, several thoughts went through Jessica's head in quick succession.

"Did Emily really only just notice that we were fucking? Why did she end the class then? Am I going to get in trouble for this?" Jessica thought to herself, but there was one thought overriding all of them: "When can I get fucked again, I'm so close to finishing!"

Jessica glanced at James's face and saw a pained expression, like he was trying hard to resist something.

She looked over at the class members as they walked in a line out the door. She found herself feeling slightly embarrassed that so many people had seen her being fucked, but she also found this turned her on even more.

Emily stood between the exiting students and the models, as she said goodbye to them all on their way out.

Once half of them had exited, and the remaining students were closer than they had been at any point during the class, Jessica heard James make a strange noise, and turned back to face him once more.

She turned her face at the perfect moment to see him finally lose control. He finally exploded, and Jessica watched the cum erupt from his dick, absolutely showering her mouth, tits and stomach.

Jessica felt aroused and embarrassed once more, as she heard the final few students giggling on their way out of the lecture theatre, before Emily slammed the door behind the final student and stormed over to Jessica and James.

"What on earth do you two think you're playing at?" Emily shouted at them.

"I'm so sorry professor, we just couldn't help ourselves, it was too tempting to fuck each other..." said Jessica shyly, her naked figure covered in semen.

Emily laughed.

"Oh sorry!" she said, confusing Jessica even more, "That's not what I meant. I knew you guys were going to fuck, why do you think I didn't stop you? No, I'm annoyed that you finished while my back was turned! I wanted to see you both cum!"

"Oh!" said Jessica, relaxing and laughing herself, "Well that explains a lot! I hope you enjoyed our little show, professor!"

"I did, but I wish I had seen the ending," said Emily, looking slightly sad. "I was hoping everyone would leave before it happened. I'm not sure everyone would have believed me not noticing you both orgasming."

"Well, technically..." said Jessica shyly again, "Only he finished."

"Wait, what?" said Emily, sounding more annoyed than earlier, and turning to accost James, "You finished before her! Ugh, men! Well, we're not done here then..."

Emily went over to the entrance and locked the doors shut, before returning to them.

"None of us is leaving this room," she said sternly, as she began to unbutton her top, "Until Jessica has an orgasm."