**Chapter 1: The Unseen Prank**

Katsuki Bakugou, also known as Kacchan, was notorious for his mischievous ways and love for pranks. As he walked through the bustling corridors of U.A. High School, a sly grin spread across his face. Today was going to be a day to remember, not just for him, but for his classmate, Ochaco Uraraka, also known as Daphne. Bakugou had managed to get his hands on a pair of high-tech, vibrating underwear, and he had cleverly switched them with Daphne's. The device was controlled by an app on his phone, allowing him to initiate and adjust the intensity of the vibrations at will. He couldn't wait to see her reaction. As the morning lessons began, Bakugou discreetly sat in his seat, phone in hand, trying to stifle a chuckle. He glanced over at Daphne, who seemed oblivious to the impending chaos. The first few minutes of class passed without incident, but Bakugou's patience was short-lived. With a sly smile, he opened the app and started the vibrations at a low intensity. At first, Daphne didn't react, but as the minutes ticked by, her eyes began to widen, and her cheeks flushed. She shifted uncomfortably in her seat, trying to maintain her composure. All Might, their teacher, was in the middle of explaining a complex technique when Daphne suddenly let out a soft, barely audible moan. Her eyes darted around the room, hoping no one had noticed. Bakugou, however, was in hysterics, internally laughing at her predicament. The vibrations intensified, and Daphne's discomfort turned into a mixture of shock and embarrassment. She bit her lip, trying to stifle another moan, but it was too late. Her classmates began to glance over at her, sensing something was amiss. Bakugou continued to adjust the intensity, watching as Daphne's reactions became more pronounced. Her hands clenched into fists, and her legs squeezed together, as if trying to alleviate the sensations. The classroom was now filled with an awkward tension, with some students exchanging worried glances, while others seemed completely oblivious. As the lesson drew to a close, Bakugou decided to crank up the intensity. Daphne's eyes went wide, and she let out a louder, more audible moan. Her body began to squirm, and she was on the verge of losing control. The classroom erupted into a mixture of gasps and whispers, with some students giggling, while others looked on in confusion. All Might, sensing something was wrong, approached Daphne, concern etched on his face. "Daphne, are you okay? You look a bit...distraught," he said, trying to gauge the situation. Daphne's face turned bright red as she frantically shook her head, trying to compose herself. Bakugou, still in control of the device, decided to push her to the limit. The vibrations reached a crescendo, and Daphne's body shuddered. She let out a loud, uncontrollable moan, and her eyes rolled back. The classroom fell silent, with all eyes on Daphne. Bakugou was grinning from ear to ear, enjoying every moment of this. He had no intention of stopping now. The real question was, how much more could Daphne take?