They get into position

Emily led Jessica and James onto the stage area she had designed, with an ornate couch in the middle of it.

"Ok Jessica," said Emily, "you lay down on the couch and spread your legs wide apart."

Jessica obliged and did exactly that.

"Now then, my dear," she said to James, "You need to position yourself just next to her, with one knee on the couch near her, as though you are about to fuck her."

Jessica felt incredibly aroused as she watched her naked friend stand over her and bring his hard cock close to her pussy.

"That's wonderful! You two make a spectacular scene!" said Emily, "The only thing I would like is if you could move slightly closer to her, James, as close as you can without making contact."

He did so and moved his cock so close to Jessica's pussy that she could almost feel it, or perhaps that was just her imagination.

"How's this?" asked James.

"Absolutely perfect my dears! One last thing, I need you two to be making eye contact during the modeling, so please do that and then stay perfectly still while I let the class in - I thought it would be best to lock their entrance after what happened last time." Emily responded, before going over to open the door.

Jessica and James turned to look each other in the eyes, and suddenly the challenge of the situation dawned on them.

"Um... we have to stay like this for an hour!" whispered James.

"I know!" Jessica responded, "And I'm so fucking wet right now!"

"How are we going to manage this?"

"Just breathe deeply," she said, "try to not think about it too much, and we'll make it through it without losing control."

He nodded and the two of them braced themselves as the class began to enter the room.