Hogwarts: I rely on MC to pretend to be an alchemy professor

"Um... Professor, is he okay?" Harry and the others asked Lupin.

"No problem, he's probably just trapped in the bathtub." Lupin explained.

But Kaysen didn't come back immediately, but walked towards 221. Not long after, a black SUV drove out of the garage of 221. When he passed Sherlock trapped under the bathtub, he honked the horn politely.

"Get in the car!"

When he stopped at his door, he honked the horn again to signal them to get in the car.

"Professor, why don't we go directly to Grimmauld Place? Instead, we need to take a car?" Ron asked, sitting in the back.

"Because although I know the name of Grimmauld Place, I don't know where it is, so I have to find a map." Kaysen said and handed the map to Lupin, who was in the co-pilot.

"Doesn't Professor Lupin know either? Aren't you and Sirius friends?" Harry also asked curiously.

"During school, Sirius and his family didn't have a good relationship, so if we chose to go to someone's house privately, we wouldn't choose Sirius's house, especially after he ran away from home and moved out of the Black mansion, we didn't know it even more." Lupin said as he carefully searched on the map...

"Here, I found it."

Kaysen leaned over and took a look: "Not far away."

..........................

Noon.........

"Number 12... 11... 13... Hey! Should I say it, the people here are really damn mathematical saints. Haven't they felt that something is missing here for so many years?" Kaisen sighed with a smile.

"You don't understand it either. We just need to take the letter that Sirius wrote to us. In addition to being a letter, it is also a medium, a medium for the Fidelius Charm." Lupin took out the letter from his pocket and took a look, then raised his head, and an old dark building appeared in front of him.

Others followed suit, seeing the building, walked to the door and rang the doorbell.

"So the doorbell of the oldest pure-blood family is... an electric bell?" Neville poked his head out from behind and said.

"It seems so, and the ancestral home of the oldest pure-blood family is in the Muggle community, which is quite humorous in itself." Kaisen also added.

As soon as he finished speaking, the door opened, and a sinister house elf with bones like steel wires under the skin appeared in front of them. His name was Kreacher.

"It's the city built by those dirty Muggles with the great Black ancestral home as the center! It's not that the Black ancestral home is built in the Muggle city!"

"Hey, you are here, come in quickly, didn't this old guy say anything to you?" Sirius came down from the upstairs, with his arms open in a Y shape and greeted the few people.

"No." Kaisen shook his head and carefully walked around the house elf.

Until most people bypassed Kreacher, it was Hermione's turn. Hermione smiled politely at Kreacher, and then he stopped her with his hand.

"The great Black House cannot accept the entry of mudbloods."

Before Kaysen and others could react, Sirius walked over angrily and kicked Kreacher hard: "This is my guest, keep your mouth clean!"

"Obviously, if the old master was here, this dirty um!" Kreacher obviously wanted to say something else? But Sirius sealed his mouth with magic.

"Sorry Hermione, this guy really spoiled the fun, don't take it to heart." He said to Hermione apologetically.

"It's okay, they are all poor people." Hermione obviously didn't take this little episode to heart.

Sirius brought a few people to the living room and sat down: "How should I put it, this big house really doesn't give me very good memories, so I invite you to come here, let you see if there is anything you like in this house, just move out, then I will cancel the protective spell here and sell it, and then buy a house on Privet Drive... Um, Harry, you don't mind, right?"

Harry shook his head quickly: "Of course not, then can I live with you?"

Sirius nodded with a smile on his face: "Of course, but you can't be too far away from your uncle and aunt. The protective magic that Lily, your mother, cast on you is based on blood relationship. You can't be too far away from your blood relatives."

"Oh, they wish I was far away." Harry complained in a low voice.

"You can't say that, you can't be irresponsible for your own safety just because they hate you." Kaysen explained while looking at Kreacher who seemed to be covered with lice not far away.

"That's right... Professor, what are you looking at?"

Several people looked in the direction of Kaisen's gaze, only to see Kreacher put the tea tray neatly on the ground, then he used his hands to pick his mouth hard, and his whole body kept twisting as if there were lice.

"Does he want to talk? Sirius, let him go and see what he wants to say?" Hermione said softly.

"Okay." Sirius nodded and looked at Kreacher again: "But if you dare to speak rudely to my friends again, I will chop you off... vertically."

Soon Kreacher regained the right to speak, and he roared loudly: "Prodigal! You dare to defile the great Black Mansion and want to sell it to Muggles. You betrayed the ancestors of the Black family! They are all ashamed of you!"

Sirius leaned on the sofa indifferently: "What's the big deal, as if this house is so good, there is no lighting, no ventilation."

"This is the historical heritage of the Black family!"

Kasen sat on the sofa and smacked his lips. Although it was not good for an outsider to say this, he still felt a little weird when he saw Kreacher, a slave, feeling sorry for his master's wealth and glory.

Fortunately, Kreacher is a house elf. There should be no such people in real life.

Obviously, he can't even eat enough, but he still pities those high-ranking superiors, but he doesn't know that those people don't need it at all.

As for Kreacher and the entire house elf, he can only comment... Born to be a slave, can't stand up after kneeling, pure cow and horse body.

While Kaisen was brainstorming, the quarrel between Sirius and Kreacher also came to an end, and an outsider was needed to help completely end this abstract quarrel...

So...

"Kasen, you come and judge!"

"I knew it..."