From Azkaban to Hogwarts.

Since the students had been given a good day off, William decided to take a day off himself as well. He went to the faculty lounge with the other professors, ready to play some cards.

When the group of professors arrived at the lounge, chatting and laughing, they found that Lupin was already sitting inside.

"Professor Luping, good evening."

William waved to Lupin, then started rummaging through his usual table for snacks, pulling out a huge pile.

"Some, Professor Lupin?"

William shared his thoughts with great enthusiasm, only to realize that Lupin not only didn't respond to him, but also seemed not to have heard his greeting.

"Hmm? Oh? Professor William, what's wrong... Oh, is dinner over?"

Lupin looked flustered, like a student who had made a mistake, which was extremely rare.

"What happened?"

William placed the snacks on the large table in the middle, which was used for playing cards, and then slipped over while the other professors were moving chairs with their wands—he was now particularly concerned about the castle's anomalies because the damned Dark Lord still refused to show his fangs.

"It's nothing... Sirius left... He left overnight..."

"Blake's gone? His volunteer work is over?"

"Yes, so he felt he had to move on with his life..."

“Um…don’t you think it’s possible that…” William hesitated, making sure it wouldn’t hurt Lupin, “because he’s afraid of doing unpaid volunteer work at the school all the time?”

"How could that be... Professor McGonagall would never do such a thing!"

Lupin refuted quietly—Gryffindor students don't need a reason to defend their headmaster.

'Professor McGonagall couldn't do it... but Black could...'

The volunteer's arrival was so sudden that William quickly discovered the twins weren't the murderers after a brief investigation. Considering the similar situation of volunteers in solitary confinement, he immediately understood who the real culprit was.

"Um, you should know about that, you know, that survey questionnaire, right..."

Lupin understood immediately—even though he was a Gryffindor graduate, he had managed to obtain the actual exam questions afterward.

"That one, is it Sirius Black?"

Lupin looked utterly shocked; this was the first time William had seen him with such an expression in almost a year of working together. "No way, he...he..."

It took him a long time to finally laugh.

"I was wondering why the professor made him do volunteer work... It's like he hasn't even graduated yet..."

"No wonder you walked so fast, you were feeling guilty!"

Lupin shook his head, stood up, and said to William, "Let's go, Professor William, the game is about to begin!"

-

'He's gone…'

In the Gryffindor common room, Harry was staring blankly at the letters in front of him.

Before his godfather left, he sent him a letter via an owl—if it weren't for that, Harry would still be engrossed in the twins' immersive snowball fight.

"We guessed it before Professor William came, but we were still a little incredulous when it actually happened... That war was just too amazing!"

My dear godson:

I'm leaving Hogwarts; it was all planned long ago...

"So what if you can control your wand precisely? A barrage of snowballs is far more lethal—we're professionals, after all. Back in our third year, we were already setting snowballs to chase people!"

"Of course, Professor Quirrell's matter is in the past—two years have passed, and we've long since found a more professional way to control the snowball!"

Both Hogwarts and the Ministry of Magic are willing to offer me some assistance, and I believe this is a good start…

"Of course, we need to thank Miss Selma. If she hadn't been at the back of the line holding the professor back, we wouldn't have been able to enjoy so much free time—she's a good girl."

"Come on, George, you guys have thrown plenty of snowballs at Hufflepuff students, and Miss Selma didn't dodge them either!"

"The professor was talking about academy sparring. We just have a bit more control over the snowballs—though sometimes they don't even become snowballs before they're thrown."

Wandering around the castle in the Invisibility Cloak is still a bit dangerous. That snotty-nosed guy is a true Slytherin through and through; it's best to stay away from his office!

The contrast between the recent laughter and the current mix of longing and loneliness made it difficult for Harry to control his emotions.

The contrast was too great—he had originally planned to share the twins' snowball fight with Sirius, otherwise he wouldn't have been listening so attentively…

'Take one last look, and write the story down in a letter…'

Harry continued reading the letter.

There's something I've hesitated about for a very, very long time...

???

Harry took a deep breath and looked at the next parchment.

[The investigation that's been making headlines in the castle about Professor McGonagall—that was actually done by me!]

Ah… I said it… and I don’t have to worry about getting locked up by Professor McGonagall for bragging!

It was definitely Sirius Black's handwriting—it was even a little messy because the writer was so excited.

Get ready for the surprise I have in store for you, Harry!

.........

……

Harry wasn't surprised at all; he was...

Was that survey fabricated by Sirius Black?

'Merlin's socks...what did he do? The old story...'

'...'

Chapter 337 Classes and lessons are different

The ice and snow had melted somewhat, and the sunlight shining down made it sparkle and appear dazzling from a distance.

But when you get closer, you'll find that the half-melted snow has obvious dust on it, making it look rather dirty—just like those energetic teenagers running around Black Lake right now.

"Hurry up, or the people behind will be swallowed by the water!"

William ran alongside them, chuckling and encouraging the first-year students.

He wasn't joking. At the very back of the line, two somewhat dirty-looking clumps of water were chasing after them, slowly but steadily rolling along with the group.

Although William must personally control the water mass due to the spell and manipulation, it is sufficient for teaching first-grade children.

They can use any spells they can think of to slow down the water mass's crawling speed when they fall behind, but if they fail, they will be severely punished by the cold water of early spring.

There's no need to worry about catching a cold. William prepared a whole pot of medicine to ward off the cold in advance. Apart from the unusually spicy taste, it was of excellent quality in every other aspect.

Add to that a magic trick to dry clothes, and this is what a first-year student's classroom looks like.

"Alright, let's stop here!"

William shouted to the children at the front while directing the water swarms behind him to release the unfortunate ones who failed before the finish line.

"Tony, come on, drink the potion."

As he tossed the potion over, he waved his wand to clean the water off the poor little guy.

After watching him drink the potion and see wisps of white smoke rising from his head, William finally felt relieved and walked over to the other students.

"Hmm, this week's results are a little better than last week's—Ravenclaw gets five points, it seems like you've found another very effective spell."

He didn't hold back his praise—the three Ravenclaw kids who were lagging behind had just trapped those water spheres for almost half a minute with a very creative variation of Transfiguration spell, which couldn't be more perfect for first-year students.

William nodded as he looked at the students who were laughing unusually happily.

'Although this is unfair to older students, students still have to be taught from first grade, after all. I can even change the curriculum and adjust the learning scope myself.'

Last year, Professor Lockhart gave William two great treasures: first, Lockhart's chaotic teaching methods made William's teaching methods seem more formal; and second, the professor's chaotic course arrangements gave William a great deal of imagination.

Honestly, he had never imagined that Hogwarts' curriculum could be changed so drastically, but after Professor Lockhart did those things, William suddenly understood.

"Last year, I certainly wouldn't have made the students run laps like that, and I even made major changes to the textbook."

In fact, the first-year students' coursework was almost completely different from the past. William drastically revised the theoretical knowledge—the freshmen like to use wands, right? Very good. This whole school year you will learn to make mistakes. Apart from the way to hold and position the wand and a summons spell, the rest of the class time will be given to them to make mistakes.

Of course, William also believes that physical exercise is essential, but he made some slight modifications to make it a little more interesting.

Except for the fifth and seventh years, the final exams for the other grades were set by the school itself, and there was nowhere in the entire British magical community to compare them. This provided an excellent environment for William to carry out sweeping reforms.

Although Lupin has come to Hogwarts, he is the senior professor of this course in terms of seniority.

'Yes, very effective. Hopefully, you can maintain this pace until the final exams.'

If the exam papers from previous years were used again, these kids would probably do terribly—they really didn't learn any theory this semester, they mostly learned random little curses and how to apply the spells taught in other courses.

'Incomplete'

Looking at the chaotic students below, William smiled. 'But they really can fight… second-year students definitely couldn't beat these brats!'

Although this would lead to more violations of school rules, William wasn't afraid of that—Professor Binns kept saying they were short-staffed.

Last year, teaching senior students laid a good foundation for him. After figuring out what the OWLs exam required, the first five years of courses, while not necessarily split up arbitrarily, were not difficult to divide up if desired.

He managed to recover from such a poor foundation in fourth grade last year, so he has no worries about messing things up.

'Next year we can revise the first-year curriculum again. The existing magic is still a bit chaotic. It would be best to add some core elements, core magic that can form a magic system... This is another daunting task...'

There are probably so many kinds of magic spells that even Dumbledore couldn't possibly know, but the concept of a magic system certainly exists.

Take Professor Lockhart from last year, for example. He was only good at a few spells, but his Oblivion Charm made William quite envious, and almost all of his skills revolved around his Oblivion Charm.

The position of the wand, the way it is held, the habitual standing position, even the smile and attire are all in service of that Oblivion Charm.

William himself is most proficient in the Ironclad Charm. He can now easily snap his fingers to cast a protective spell on himself, followed by coordinated dodging maneuvers and unexpected attacks, and finally various offensive methods including black magic.

As for Dumbledore, although William had never seen him in person, judging from the information on the cards, the core of his magic must be the Animation spell from Transfiguration—of course, there could be more, but it must include the Animation spell that can bring various objects to life for attack, defense, or even movement.

However, not all magic is suitable as the core of a system. He was only just beginning to understand it and could only offer his students some advice before presenting them with various possibilities.

They may not know the systemic knowledge, but as they use it, they will definitely find their best magic and then learn to use other spells to complement it.

With a little more theoretical knowledge, their self-defense skills would then be at a passing level for OWLs (Overwatch League).