"Do you really promise you won't tell anyone else?" Harry still looked a little apprehensive, not because he was worried about William borrowing the books, but because he was worried that he would tell Malfoy about his plans.

"yes, how do we know if you're going to tell Professor McGonagall or Malfoy about us if you're going to change hands?" Ron was also on the side to help.

"I don't have the leisure to be involved in your love-hate relationship with Draco." William's words left Harry a little confused.

There has always been a naked hatred between him and Malfoy!

"And you can only trust me, or I'll go to Professor McGonagall right now and explain what you did in the girls' bathroom." William looked at Harry and the others with fear, he had already grasped their biggest handle.

"We can lend it to you." Hermione spoke calmly.

"But you must, as you promised, keep your mouth shut about it, and don't divulge it to anyone."

"Of course it's fine, I can swear by magic, I won't tell anyone." William looked at Harry with some amusement, did they really think they were interested in participating in the adventures of Savior Potter?

What an international joke!

After taking a closer look at William and seeing that William's attitude did not seem to be fake, Hermione finally turned around and picked up her bag from the corner of the cubicle, and then pulled out a moldy tome from it.

Although the clever little witch had memorized every step of the Polyjuice Potion, she had the book with her at all times, just in case.

Hermione flipped to the pages of the tome on how to make Polyjuice Potion and pulled out a few pieces of parchment from her bag.

It looks like she was planning to transcribe the steps of making the polyjuice decoction on the toilet.

"We need to transcribe the process of making the polyjuice decoction before we can lend you this book. Seeing Merlin's ghost, how come I can't find my quill, do any of you have a quill? She looked at Harry and Ron with a pleading look.

"You know, I just came to the school hospital." Harry said with some embarrassment.

"I didn't bring it either." Ron also spread his hands helplessly, he didn't even bring his schoolbag, how could he bring a quill.

"Use mine." William fumbled in his magic bag for a while, then pulled out the bells and whistles of the wicked bird quill that Terry had complained about.

"You've got a special taste." Look at this quill of orange, pink, lime-green and yellow. Hermione couldn't help but spit out.

"That's the feathers of the Wicked Bird, I bought them at a quills shop in Diagon Alley." Why do people always complain about this quill, it obviously looks good, William thought helplessly in his heart.

"Damn rich people." Ron muttered softly.

Looking at Hermione, who was about to bury her head in copying, William asked with some amusement, "No, it's 2991, do you still plan to copy by hand?" ”

"Is there anything better you can do?" Hermione said impatiently.

"Of course." William stepped forward, took the moldy tome, and waved his wand lightly.

"Ahh Hermione exclaimed in surprise as she suddenly realized that the quill in her hand was moving uncontrollably, struggling out of Hermione's palm, and then quickly began to write on the parchment.

Again, why could he cast these magical spells so easily!

"Let me see what's so magical about this potion, boiling lacewings for twenty-one days? It's no wonder that the compound decoction takes at least a month, and the flowing leaf grass picked at the time of the full moon is also added, which is not hard to come by.

Wait, the powder of the horn of the bicornus, and the fragments of the snakeskin of the African tree? These aren't just the materials you can get easily, so what are you going to do? ”

"That's our business, you don't need to worry about it."

"I'm just asking casually, and if you don't want to say it, forget it." William waved his hand indifferently, and to be honest, he really admired the courage of Harry's men to dare to hit Snape's private collection.

"It's already copied, and to be on the safe side, I suggest you check it out." Looking at the quill that had stood still, he handed the book back to Hermione.

"No, I've memorized the entire configuration process, and there's nothing wrong with it." Without taking the heavy tome, Hermione quickly glanced at what was written on the parchment.

"Then don't bother you, I'll go." After William put away the "Powerful Potion" again, he was about to walk towards the outside of the bathroom, his purpose had already been hit, there was no need to waste more time here.

"Wait a minute, when are you going to give us back this book?"

"When I finish reading this book, I guess it will take about two or three days, and then I'll come here and return the book to you, anyway, you'll often prepare potions here in the future, won't you?"

By the way, I don't know who came up with the idea of hiding the flame in the toilet, which is quite a creative idea. ”

After saying this, he turned around and left the girls' bathroom on the second floor. With the heavy sound of the door closing, Harry and the others couldn't help but breathe a sigh of relief, at least what they feared most hadn't happened.

"Hermione, how can you lend him the book so casually, in case Friedrich uses it for something bad?" After William left, Ron complained to Hermione with some dissatisfaction.

"He's not that kind of person, I can sense that William is just curious about what the book is about, and if I don't, what if he does tell Professor McGonagall? We've almost broken fifty school rules, do you have a better way?

"Okay, let's solve the current problem first." Harry was trying to divert their attention, and he wished that Hermione and Ron would have paid more attention to the configuration of the Polyjuice Potion.

As for Friedrich? To be honest, Harry had the same idea as Hermione, and what if he were to take a look at the book, Ron was a bit too fussful.

"As Friedrich said, how do we get these very valuable materials, they will definitely not be available on the market, unless they are on the black market, but we have no access to the black market and the price will inevitably be very high."

"Do you think Snape will have these ingredients, he is a Potions professor, and he is also a Potions master, so he must have his own collection."