No, you head to Charms

You calmly stroll into Charms class, causing most of the class to stare back at you.

"I had to help a student with some school matters," you say, responding to Flitwick's inquiring look.

He nods and tells you to take a seat. You quickly slide into one of the benches next to your housemates, Tracey Davis, and pull out a piece of parchment to take notes on.

You tune into Flitwick's lecture on the Drought charm, "We can see that the wand movements utilize part of the Archimedean spiral for stabilization and..."

You're quickly distracted by Tracey Davis scooting closer to you and lightly nudging your shoulder. You give her a smirk before dropping your left hand under the desks and caressing her inner thigh. You snake under her robes, slipping your fingers beneath her soaked underwear and you feel something rubbery.

You look at her questioningly and she blushes. You feel around a bit more and you realize that she has a dildo stuffed in her.

"Well, aren't you a naughty girl," you murmur in her ear, "and naughty girls need to be taught a lesson."

You take your hand out from under her robes and cast a subtle drying charm on it before standing up and pulling Tracey with you. You flash your Inquisition badge at Flitwick and he nods, going back to teaching. You lead Tracey to the back of the classroom and conjure a chair for her to sit in.

"W-wait Harry, people are watching" Tracey whispers to you as she nervously looks around.

You instruct the people around you to go back to their business as you push her down on the chair. You quickly bundle up her robes and pull down her panties, causing the dildo to slip out with a small pool of juices. It was a simple slim black dildo with a flared base. You grab it and put it up to her mouth.

"Clean it," you quietly order her as she clutches it and gives the dildo a few tentative licks.

"How long is your wand?" you question her as you take the dildo back.

"Uh, 7 inches," she replies in a curious tone, "why do you need to know?"

You take the dildo and transfigure it, causing it to extend up to eight inches and doubling its width. It was now covered with spiraling grooves and ridges, looking much more intimidating than before. Tracey's eyes widen as you begin to thrust the transfigured dildo back into her pussy.

"Wa-wait Harry, it's not going to fit," she whimpers as you slowly plunge the dildo inch by inch into her cunt.

After several minutes, you cast a sticking charm on the dildo that was fully impaled inside of her.

"Perfect," you say as you admire the view, Tracey sat limply, gasping for air and trying to recover from the invader in her vagina.

"I've made the inside hollow so you're still able to store your wand" you add, noticing your classmates sneaking glances at Tracey.

"Oh, and I almost forgot," you say as you cast a vibrating charm at the dildo making Tracey quiver.

With that, you pull up her panties and smooth out her robes before helping her off the chair. Tracey stands up, tightly grasping your arm and you snap a vanishing spell at the chair, making the fluids and the chair disappear. You lead Tracey back to her seat as she moans and shudders every so often.

By the end of the lesson, there was a growing puddle of juices under Tracey as she fruitlessly tries to keep herself quiet. As everyone begins to leave, Tracey's friends mob her, peppering her with questions. You're halfway out of the classroom as you notice Daphne Greengrass shooing people away and helping Tracey pack up. Before you leave, you also note with a chuckle how Daphne gives her friend a quick grope on the ass as she leads her out of the classroom. Perhaps you might give her a reward later.