It is a long, painful class

She jerked the string violently, tugging your clit painfully anytime you tried to pay attention to the lecture. Frankly, it was a miracle the teacher hadn't said anything about your exposed pussy. He probably saw the string and knew you'd be tortured enough or he felt awkward dragging attention to it. Your yelp of pain, however, has absolutely no issues drawing all attention to you. The students had already seen your predicament and several were recording you. Zooming in on your clit or expressions no doubt. The teacher just turns back to the lecture, keeping his back to his students and pretending he doesn't hear anything. He was leaving you at your classmates mercy, your clit bound tightly and tugged violently every few minutes. There were tears in your eyes and you yelped or squealed to every tug, your legs squeezing together or kicking around. It didn't matter what you did, nothing stopped the pain from exploding through your love bud.