Belby looked at him in disbelief, are you going to make me go back to school?

"How about we find a place to sit and talk about it, in the Hogsmeade's Three Broomsticks?" Felix suggested.

"No problem." Belby talked to his brother and quickly walked over.

Snape had already left, so the two used Apparition and went directly to the entrance of the Three Broomsticks Inn.

"A very good experience, Felix, I did not feel any discomfort." Belby said admiringly, "I generally do not use it on my journey unless I have to ..."

Felix and Belby walked into the inn, it being a weekend, there were only small groups of little wizards from Hogwarts sitting inside, especially couples, and they too watched in amazement as Professor Hap and a stranger walked in.

"Is that Professor Hap's friend?" Clemmie Vera thought to herself as the girl next to her stared curiously at the duo.

Felix picked a seat in the corner, and Mrs. Rosmerta came over to take down their order, and within a minute, it was delivered.

"A glass of low-alcohol mead."

"A glass of sorbet with limoncello."

She wiggled her waist and left.

Felix knocked on the table, and the surrounding voices weakened all at once.

"Felix, this is?"

"It's best to keep the little wizards out of this conversation between us." Felix pointed a short-distance away, and several young wizards peered curiously, and he even saw a few familiar faces.

Next, Felix briefed him on the encounter with the last Defense Against the Dark Arts class professor.

"So that's it, I didn't pay much attention to the incident," Belby said.

"There is something I must warn you about, the rumours about the curse placed on this class in the outside world ..." Felix concealed the existence of Voldemort and used a powerful wizard to refer to the source of the curse by proxy.

"Well ..." Belby some hesitation. "According to you, I only need to teach a little over half a year, and the curse would not affect me?"

"From past decades of history, it is true that the vast majority of those wizards who have taught Defense Against the Dark Arts classes are still alive and well, except for a few-"

"But they all have their own reasons for this, Damocles, you are an excellent wizard, and with a much shorter period of substitution, this danger is near negligible."

Felix said sincerely, "Hogwarts has the largest collection of books in the world, and I think it would be no less useful to you at this stage."

Belby's eyes lit up at once, "Indeed ... I spent more than ten years researching wolfsbane potions, and what troubled me most about this was the lack of research material of the same type."

Magic potion masters are a group of relatively nerdy wizards, they have less time to socialize, which is related to the nature of the potion - a magic potion will be brewed for a month or two, if you want to make improvements, at least a hundred trials are needed.

His mind livened up, perhaps he could spend a little over half a year to recharge himself - the word 'recharge' is also something he learned from the Muggle world.

What's more, there is a Potion Master at Hogwarts to communicate with.

Plus the twofold lure of Forbidden Forest and Lady Sprout's greenhouse ...

"Do you have any tips to offer, Felix, if I agree to teach?" Belby asked, his heart already racing.

Felix thought for a moment and said, "I suggest you prepare a few defensive magical artefacts - I can provide them to you, no-no, there's no need to be nervous, I'm just used to coping with problems proactively." He looked at Belby's expression and added.

"Secondly, when you communicate with Dumbledore, you can seek more information from him about the course, especially those wizards who used to be professors of the Defense Against the Dark Arts class - what is their current status? You could even visit some of them."

"Finally, prepare for the class in advance, the level of the young wizards at Hogwarts may be different from what you might expect."

Belby flashed a smile, "I graduated from Hogwarts too, Felix, and I know the level I was at."

...

That day, Felix told Dumbledore about it.

"So, we will soon have an excellent professor?" A look of surprise appeared on Dumbledore's face, "To be honest, I was just about to send out the job advertisement."

"Headmaster Dumbledore, Belby is just a little intrigued, and you still need to communicate with him on that aspect specifically, so I'll stay out of it. But - he is one of the few friends with whom I can chat, I hope you can guarantee his safety."

Dumbledore's blue eyes looked at Felix, he smiled mildly and said, "Of course."

Over the next few days, Felix didn't pay much attention to this matter. He went through the routine of teaching, answering questions, and studying magic.

This rhythmic life made his sense of time blur.

The week passed quickly.

On a clear afternoon, the snow began to melt from the castle and the roof was dripping with silver drops.

The Weasley twins blocked him at the end of class.

The two chuckled and pulled out two coins, which Felix took, and he couldn't help but wonder if they'd scrapped the "Fever coin".

But to his surprise, the coins were intact, and there is something more to it.

Felix fondled the brass coin in his hand and looked at the twins, who exchanged a sly glance.

"Is this going to be a challenge?"

He felt the magic contained within, and after ten seconds or so, he squeezed one of the coins and injected magic into it, and the other copper coin quickly became hot, and the performance became bumpy.

Felix examined it carefully, and several abbreviated words emerged from the awfully hot coin, and he tried to deduce them, and found that the sentence that best matched is -

'Filch is coming, get out of here!'

Felix: "... This is your night tour prop?"

"Uh, Professor Hap," Fred said, "don't you think it's a good emergency item - it should be useful when Auror raids the wizarding black market, like closing holes in the lines of defense or something. "

"Or a code word passed between lovers, the words on it were filled in randomly," George said.

Oh.

Felix would not believe that they first worked out this thing, absolutely to the convenience of a night tour.

And, what wizarding black market ... I think you're trying to con me.

But - they are very open-minded, just like they said about the two scenarios, there is some feasibility.

"So why did you approach me?" He asked.

"Professor Hap, we've run into some difficulties - for example, the words on the coin are fixed, and we have no way to modify them."

"The coin itself is too small to have anything to write on it."

"Yes, we hope to work on gadgets that allow two-way communication, similar to a two-way mirror, but of course -"

"-Costless!"

"- Easier to make!"

They looked eagerly at Professor Hap, hoping that Professor Hap could answer their doubts.

In the past few years, some prank props were researched by the twins themselves, but many ideas could not be realized and had to be put on the shelf.

But the good thing is, Professor Hap has agreed that they can always seek help from him.

When the twins finished speaking, Felix fell into a contemplative mood and stood motionless in place.

After a few short moments-

The two men looked at each other, and Fred said, with some caution, "You just need to give us a little hint ...."