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

By escaping to the bathroom, Lupin successfully avoided the time period for signing the magic contract. After a while, after a few pleasantries, Lupin stayed in the dragon farm in Romania, while Kaisen and others began to prepare to return to England.

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"Bye you guys, see you at school." Lupin said, leaning against the side of the plane.

"It won't take that long. We have to go watch the Quidditch World Cup, have you forgotten?" Sirius said, sticking his head out.

"Oh, don't worry, I won't forget... I don't know if the factory manager will tear me to pieces if I ask for leave." Lupin said with a smile.

"If he tears it up, you won't come?"

"In fact, I prepared a large bucket of dill, which should be enough to stick me back." Lupin said jokingly.

"That's no problem. If you break your promise that day, we will really need to come and catch you with wands in hand," Kaisen added.

"Don't worry, it won't happen."

After getting Lupin's assurance, Kaisen slowly started the engine of the plane. Gusts of wind spread out from the helicopter to the surroundings, and the plane slowly flew into the air.

"Bye!"

The journey back to England was much calmer than the journey from England to the Netherlands...Italy, although they should not have returned so early, their original plan was to travel around most of Europe...

"What a shame about my holiday plans." Kaisen sighed and complained.

Harry also cursed the Holy Blood Brotherhood at the same time, only Sirius, who was sitting in the back seat, remained silent because he was afraid of causing trouble...

"Kaysen, can't you give me a hidden blade too?"

Kaisen's mouth twitched: "I'm sorry, no."

"real?"

"Really, I'm about to land, and you better get out of here right now... Remember to call me after you buy the house.

"OK........."

After the three of them had a special meal prepared by the house-elves at Hogwarts, Harry and Sirius returned to Privet Drive in the Muggle world. The former was the type who was happy to be with his godfather wherever he went, while the latter was planning to show off his money skills to own the entire house at Privet Drive.

Kaisen did not return to Baker Street during this holiday. After all, he still had his own upgrade plan to work on. Those magical experiments were always inconvenient in the Muggle world, especially when his neighbor was a detective with a strong curiosity.

Although the detective knew everything about him and he wasn't afraid of seeing my magic, it felt like there was someone familiar watching your screen 24/7 when you were writing a novel or painting.

It gives people a weird sense of shame.

After returning to Hogwarts, Kaison first strolled around Hogwarts inside and out, and then gave Hagrid and Filch who stayed in Hogwarts the souvenirs he brought from Italy.

As for where Dumbledore went, no one knew... maybe he went to see Grindelwald. After all, the latter was said to be under Dumbledore's strict control in Hogwarts, but in fact, he had hardly seen Grindelwald in Hogwarts throughout the entire last semester.

"...Everyone is busy...it's better to be busy." Kaisen sighed and returned to the office, taking out the trident again.

At least for Kaisen, it was not too difficult to peel off the layer of strange magic on it. He just had to grind it with a grinding wheel and then copy it in the enchantment book.

As for the magic of the enchanted book... if that thing rolls on the anvil a few times, it will sooner or later be translated into runes again. It is rare to apply this kind of magic.

After all, he only has the power of Ender Teleport now, and can be said to be the most mobile person in the magic world today. However, it is a bit of a waste to use such high mobility to build a mobile turret.

And again, there is no big problem in using turret-style magic to kill large areas, but even if you really face those great wizards at the top of the pyramid of the magic world, you can only maintain suppression, and it is very difficult to win in a very short time.

After all, this is a common problem among wizards who deal group damage. Fortunately, I now have the opportunity to change my job to a magic assassin.

As for how to transfer...

Alchemy, you know it.

After Kaisen took off his shirt, he pulled out a small diamond sword, casually passed it over with flame, took a deep breath, and aimed it at his forearm.

Phew!

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

In the evening, after Dumbledore finished his meal prepared by the house-elves, he walked out of the castle and planned to take a walk around the Black Lake. Then, the entire Black Lake was suddenly illuminated by more than half of the orange-yellow light.

He looked up and saw warm light coming from the huge floor-to-ceiling windows of the Alchemy Office.

"You're back so soon..." Dumbledore murmured, and subconsciously tried to use Apparition... but it was useless.

"Oh...have pity on my old bones." He sighed and could only settle for the next best thing. The Ender teleported to the office door and rowed the famous boat to the office area. Then he strangely smelled a slight smell of blood.

Dumbledore frowned. He didn't feel any high-energy magical fluctuations, so he didn't suspect that Kaisen had done something strange to him again. So there was only one possibility.

"Kasen, are you hurt?"

As he spoke, he gradually walked towards the corner, where he heard strange tinkling sounds.

"What are you doing?" Dumbledore asked. When he came closer, he felt as if his head had exploded. He asked dazedly, "What are you doing?"

Kaisen was only wearing underwear... at most an overcoat, and his entire body was covered in various marks with markers. Both of his arms were already covered in blood, and there was a silver mark on the outside of his forearm that was almost as long as one side of his forearm, and there was also a silver mark on the inside of his wrist.

"As for me, it's an alchemy experiment." Kaisen glanced at Dumbledore and stretched out his hand as a matter of course. The next moment, a bright silver hidden blade suddenly extended from the inside of his wrist, flashing with lavender magic.

"Not only this, there's more." The next moment, the silver mark on the outside of the forearm flashed for a moment, and the next moment, two mantis knives like the front claws of a giant mantis popped out from it, still in the bright silver alloy color, flashing purple light.

Dumbledore's face was extremely gloomy, but he still sighed and began to speak earnestly: ".........Before I came back, there were only you, Hagrid and Filch in Hogwarts...Do you know that if anything happened to you, you couldn't even get to St. Mungo's?"