The pet he had raised for several years actually knew how to use a magic wand. He felt so confused that he didn't dare to get close to Banban anymore.

"That's what we wanted to ask." Professor Lupin glanced at Black who was laughing non-stop and frowned, "How do you know Peter can't change back?"

Kyle didn't answer immediately, but took out his wand.

"Fainted!"

Peter, who was banging his wand, immediately fell to the ground.

Afterwards, Kyle returned Hermione and Professor Lupin's wands to them, and then explained, "Because of the tonic I brewed for it."

"Tonic?" Hermione frowned as she took the wand. "But the book never said that pet tonic can prevent Animagus from returning to human form."

"Regular ones don't work," Kyle said, "but I added a whole dried mandrake leaf to its tonic... the one on top of the root."

"What did you say?" Professor Lupin raised his voice subconsciously.

Mandrake leaves are not cheap to begin with, costing five Sickles each, and the one at the top of the root is even more expensive, almost ten times the price of ordinary leaves.

Such an expensive thing is enough for him to live for a month, but Kyle actually used it to make tonic for a mouse?

Did Kyle know that Scabbers was Peter?

That's not right... Professor Lupin shook his head. They were the only ones who had seen Peter's Animagus. Moreover, Peter's fake death happened twelve years ago. How old was Kyle at that time? Two? Or three?

"It's just a coincidence..." Kyle ignored Professor Lupin's strange expression and continued, "I originally wanted to make the tonic more effective, but I didn't expect him to be an Animagus."

"But... does this matter?" Harry blinked and asked confusedly.

"Of course it does." Kyle conjured a cage, locked Peter inside, and said without raising his head.

He thought someone would help explain it, but no one around spoke until he finished dealing with Peter.

Even Hermione and Lupin looked at him in confusion, with the same expression as Harry.

"You never read any herbal books other than textbooks?" Kyle asked subconsciously.

Hermione shook her head slightly. Of all the books she had read, the ones about herbs were the least.

Professor Lupin also turned his head away, his situation was similar to Hermione's.

"Okay..." Kyle sighed and could only continue, "Mandra leaves are very good for magical creatures. They can heal wounds, strengthen their physique... They can be used in many places, but it's different for Animagus. You should know what the first step in learning Animagus is..."

Kyle said the last words to Blake.

"Of course I remember." In mid-air, Blake did not ask Kyle how he knew he was an Animagus. He just rubbed his sore chin and said, "Put a mandrake leaf in your mouth for a month... To be honest, that month was too hard to endure. I almost gave up several times."

"That's it."

Kyle said, "The function of the Mandrake Leaf is to record all your information as a wizard. It is equivalent to another "you", or a beacon that guides the direction..."

"What lighthouse?" Harry was confused.

He felt like he was in Professor Trelawney's divination class. He couldn't understand a word of it. The main point was that participation was the most important thing.

"Okay, let me put it more simply." Kyle sighed, "The chrysalis can turn you from a human into an animal, and the mandrake leaf can turn you back..."

"What is a ghost-faced hawkmoth... Ouch!"

Harry wanted to ask more, but before he could finish his words, Hermione elbowed him in the waist, causing him to grimace in pain.

"That's a potion ingredient." Kyle glanced at him and continued, "So when an Animagus eats a large amount of Mandrake leaves in animal form, the information about the 'wizard' in the body will gradually disperse until it can no longer be transformed back."

"Because there is no need for that." Kyle said, "Strictly speaking, the information of the 'wizard' is difficult to disperse, unless it is eaten for several years in a row... and once it changes back to human form, the information will be reunited.

There aren't many Animagus to begin with, and the chances of them being animals for five consecutive years while constantly eating things containing Mandrake leaves are too low...

In the entire wizarding world for a thousand years, there has only been one person... Oh no, there should be two now."

Kyle glanced at Peter in the cage.

Blake started laughing again.

Professor Lupin looked at Kyle and suddenly asked, "Did you know that Scabbers was Peter?"

Kyle turned his head and asked, "Why do you say that?"

"Because I didn't see any surprise in you." Professor Lupin said, "Whether it was me, Harry, Ron, or Hermione, we were all shocked after we confirmed that Scabbers was Peter. Only you were different. You were very calm."

After hearing what he said, everyone looked at Kyle at the same time.

Ron seemed about to say something, but was stopped by Hermione.

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"The reason I'm not surprised is that this isn't the first time this has happened," Kyle shrugged.

"What?" Professor Lupin was stunned, as if he had not expected Kyle to say that.

"In fact, a similar thing happened when I was in my first year. Another student's pet was also an Animagus, and it was also a rat."

Kyle smiled and said, "If you don't believe me, you can ask Fred and George, or other students above the fourth grade. They all know."

Everyone looked at each other with wonderful expressions.

Harry and his friends entered the school a year later than Kyle, so they naturally didn't know about this. Professor Lupin, who just came this year, only heard a rough outline of what happened before from other professors, and most of them were related to Harry.

He didn't ask any more questions before that.

After listening to Kyle's explanation, Harry nodded to show his understanding... To be honest, if he saw another face on the back of a person's head now, he would not be surprised.

Soon, the room fell into silence, except for Blake's gradually hoarse laughter.

Harry felt a little awkward. He looked at Professor Lupin hesitantly, wanting to ask something but not knowing how to start.

But his expression was so easy to guess.

"Want to know about Lily and James?" asked Professor Lupin.

"Yes." Harry nodded. "I just heard you say that you used to be friends."

"Best friends, at least to me," said Professor Lupin.

"Can you tell me, then?" Harry asked eagerly, "what happened, and what this secret-keeper you just talked about means."

Professor Lupin hesitated for a moment, but nodded...

"Okay, you have the right to know the truth, but I only know the beginning, and Sirius will need to tell you the rest...

Let me think where to start... I first met James and Lily when we were at school..."

…

(End of this chapter)