An interesting lesson

All the girls around her were looking around the room, confused as to what was going on. The reactions were quite different. Some, like Hermione, tried to ignore what was going on for now. After all, the vibration level was rather low. So far... Lavender brown for example went another way. She almost instantly started to move her hips back and forth, not all that hard but then again Hermione was not even sure that she did it consciously.

The strongest reaction came from Cho she began to squeal more and more. Why was it so much stronger with her? Cho tried to readjust her seating position, but it seemed that the slightest movement made her eyes widen and made her scream out, so she sat back down. She was already drawing angry looks from the teacher.

Hermione herself tried to focus on the lesson and take her notes. This was still class after all, no matter how much that thing inside of her vibrated. She heard the boys in the back row chuckle as all around her, reactions got more intense. And Hermione found out why. The vibration was getting stronger. She still managed to focus, even though she got wetter by the minute, but not everyone was so determined.

Some girls who had been calm before now showed signs of being penetrated, like moaning or rolling their eyes back. Lavender was making her chair rattle now by moving back and forth with her wide hips. And Cho was clenching the edge of her desk, panting heavily and squealing like an animal. It was at that point that Hermione noticed that Cho was sitting just a bit closer to the front of her chair compared to everyone else. But that would mean... Oh. Well, that would explain her strong reaction.

Just as Hermione pondered how lucky she had been to not end up with that thing in her ass as well, she suddenly let out a groan. She was not the only one. All across the room girls screamed, moaned, and groaned loudly. The magical chair-attached dildo started to move up and down now. And not exactly in a gentle way. Lavender had lost control completely, crouching on her chair and happily squealing with pleasure. Cho looked like she was about to pass out, but there still was, Hermione realized, a trace of a grin on her face.

Hermione herself noticed that her handwriting was getting very shaky now, not because of the ups and downs of the chair, but because her body twitched from a powerful orgasm. All around her girls came, some of them even multiple times. All things considered, the lesson could have been a lot worse, Hermione thought as the wooden chair dildo suddenly disappeared. She turned around to the grinning Fred with a look of intermingled scorn, amusement, and hints of pleasure. Those twins sure were creative, she had to give them that.