One evening, a few days after Christmas, Harry Potter and the two Weasley children huddled in the kitchen of the Burrow.

The kitchen is small and cramped, and near the inside is a dusty fireplace...... By the fireplace was a cleanly polished wooden table and a few chairs on which they sit.

Several of them were wearing hand-knitted sweaters of the same style, with Harry's chest showing off a shiny golden snitch, hand-knitted by Mrs. Weasley...... Despite the events that had befallen her the other day, Mrs. Weasley had not forgotten her Christmas present.

"I miss life in Grimmauld Place, it's at least ......spacious," Ron Weasley muttered as he looked unhappy, "and now it's as crowded as a canned sardine......

Harry Potter and Ginny Weasley looked at each other and smiled helplessly.

Because it is!

Since that horrific attack on Grimmauld Place XII a few days ago, the Weasleys' Burrow has become the temporary headquarters of the Order of the Phoenix......

This "crooked" small building may be the first time that it needs to receive so many guests at the same time...... As Ron said, it's as crowded as a canned sardine right now!

Outside the kitchen, Alastor Moody's roar could still be faintly heard, and the Mad-Eyed Man's temper had grown irritable since the attack on Grimmauld Place, where Remus-Lupin and Siris-Black seemed to comfort him. Above the ceiling, a few small moans could be heard in addition to the sound of the ghoul "humming" on the pipe, and several of the wounded who had been wounded in the attack had been moved to this side to prevent suspicion.

Ron Weasley's original bedroom was "requisitioned" in this way, and he now has to live in that black cupboard under the stairs.

Harry Potter's situation was not much better, although Mrs. Weasley had a room cleaned for him...... One of the innermost rooms in the basement was full of all sorts of messy things, and the whole room smelled of mold, and Harry even found the textbooks that Mrs. Weasley used when she was younger, the suit Mr. Weasley wore when she got married, and the relics left behind by Mrs. Weasley's two older brothers......

"Why do you think we're coming back here!" Ron said with a sigh.

"It's not that Mommy is worried about us!" Ginny replied, "Hogwarts was almost attacked, and she doesn't feel safe on campus anymore......"

"And there are at least ten members of the Order of the Phoenix at home at all times, so it seems safe?, but if someone does want to attack us, this must be the first target!" Ron said, looking like he was about to cry, "You're fine, you just need to huddle in a room with Tonks...... And what about me...... In that damn cupboard...... I spotted a big, big spider last night......"

At that moment, a small, excited-looking owl burst in from the fireplace, covered in dust.

At the same time, its mouth let out a piercing chirp.

"Piglet?" Ginny hurriedly ran over, grabbed the little owl from the ground, and patted it with dust: "It seems to have brought some letters from the school...... This is yours Ron Harry, you have two ......"

"Oh?" Ron and Harry hurriedly came over.

......

The first letter they received was the same, and its content was simple:

"Apparition class

If you are at least 17 years old, or 17 years old by August 31, you can attend the 12-week Apparition Course taught by Professor Wicky Tecros, a Phantasion instructor at the Ministry of Magic.

Interested participants are requested to sign below and submit the letter to the Dean of the College by January 10.

Tuition: twelve Galleons. ”

"This—Phantom Manifestation!" Ron's tone sounded visibly agitated, "It should be fun!"

"I don't know. Harry shook his head, "Professor Dumbledore took me to do it once before, but it felt terrible......"

"I forgot you did, Harry...... I'd better pass it all at once!" Ron suddenly whispered, looking a little worried, "Fred and George both passed in one go, otherwise they would have laughed at me for a summer vacation......"

"Phantom Manifestation class!" Ginny said with some disdain, as she leaned over to Harry and read the contents of the letter, "Who is this Professor Waiki-Tecros?"

"Presumably a teacher in the Department of Magical Education at the Ministry of Magic. Harry guessed, "Looks like the school has another professor!"

"That's the professor......" Ginny suddenly remembered something, "I heard Tonks say it yesterday...... Professor Slughorn has been admitted to St. Mungo's Hospital for Magical Injuries and Injuries. ”

The news didn't get much attention from Harry and Ron, as they had seen the Potions teacher knocked to the ground by the Durmstrang Dark Wizard that day.

"You don't realize it yet...... What does that mean!" Ginny said with some amusement and amusement, "Professor Slughorn is definitely going to be recuperating at St. Mungo for a while...... At this time, the position of Potions teacher at Hogwarts is going to be vacant!"

Hearing Ginny say this, Harry and Ron's faces suddenly changed.

Harry, in particular, kept his eyes on the Half-Blood Prince's Potions textbook (which he carried with him at all times).

If the position of Potions teacher was vacant in the middle of the semester, Professor Dumbledore naturally did not have time to find a new teacher, and he had to let another teacher come to the Age class...... Just like when Lupin was sick in the third year (actually when he became a werewolf on the day of the full moon), the Defence Against the Dark Arts class was temporarily substituted by Snape.

So this time the substitute Potions teacher, should it still be ......

Harry shuddered, if Snape taught him another Potions lesson, he would surely discover his secret......

......

"Harry, you still have a letter!" Ginny whispered as Harry woke up from a dream.

Harry hurriedly opened the second "letter" that Piggy the Owl had brought him...... More prepared, it's a note-

"Dear Harry,

I'm going to give you individual lessons from the next semester onwards. Please come to my office next Sunday at 8pm.

Also, I wish you a great Christmas holiday.

You are faithful

Albus Dumbledore

And: I love sour soda. ”