The instructor asks Isabel to come to the front to demonstrate

(this chapter originally by "shyexposure")

As Isabel tried frantically to figure out a way to fix her situation, she was sort of out of it and didn't hear what the new position might be for the rest of the class. As a result, she panicked a little more, because failing to hear the instructor just might have the teacher call out her name and thereby informing everyone of her half-naked predicament. This could not happen, so keeping with her pose, she listened extra hard to hear exactly what the instructor told the class next

What she heard then, made her blood run cold.

"Alright class. For this next pose is fairly simple, but it can also cause quite a bit of strain on the muscles if not done properly. As such, I'm going to need a volunteer to come up here and help out. Isabel, would you mind helping me up here please?"

No no no! She did not just ask her that! She couldn't have, there was a mistake! However, as Isabel got her whirling mind back into a somewhat controlled state, she realized that's exactly what the instructor said. Gulping, knowing her entire class was now going to see her naked from the waist down, Isabel made her way to the front of the class. As she feared, there were gasps and a bit of murmuring popping up already, making her blush harder, mortified.

"Alright settle down class. Nothing to get worked up about. She's simply having a bad uniform day, and it could happen to any of you. So please focus on the class and what to do. Ready?"

With varying levels of agreement, Isabel's classmates prepared for the next pose, though many of them couldn't take their eyes off the bottomless girl. Then suddenly with a small yelp, she felt herself being bent backward in a straining position and had to widen her stance to stop from falling over! The instructor, secretly eager to humiliate her more, had made her assume the "Bridge", knowing exactly what would follow.

"Right ladies!" she barked as one hand landed firmly on Isabel's inner thigh, dangerously close to her pussy. "This is the bridge. As I said before, easy to do, but your muscles will really feel the workout, so make sure you have a partner to watch out for you."

Isabel for her part, couldn't imagine this getting any worse, but true to her bad luck it would...