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Today I behaved so badly in class... and my teacher decided to give me a lesson that I will never forget. He tied me to this chair, with my legs spread wide and my hands pinned behind the backrest, just to watch me suffer. The worst thing is that my bladder is about to burst, I feel that warm, pulsing pressure right behind my pubes, begging to come out. I beg him, I implore him with my eyes to let me go to the bathroom, but he just smiles and shakes his head. He tells me that a naughty student doesn't deserve relief, that my desperation is his entertainment. I can feel the hot liquid pushing against my urethra. My thighs tremble, my breathing quickens, and I know I can't take it anymore.