Harry followed George and Fred into an empty classroom next to him.

"Why didn't you go to Hogsmeade?" Harry asked strangely.

George and Fred looked at each other and said with a mysterious smile.

"Because we are going to give you a Christmas gift in advance, Harry, we'll leave after we've finished delivering this gift."

As they said, Fred took out a piece of shabby parchment from his pocket—a map of live spots.

Then they taught Harry how to use it. Harry looked at the map that recorded all the routes of Hogwarts and also saw all the actions of the people in the castle, and was stunned.

George is still giving him some popular science on the taboos when using this map.

"Remember, except Professor Forrest, no teacher can see the existence of this map."

Harry came to his senses when he heard his words and asked in confusion.

"Why can Professor Forrest know?"

"Because last year, the professor already knew about the existence of this live spot map." Fred shrugged.

George followed his words: "Yes, it was the first day of school. We had just finished teasing Felch, who was going to come and catch us. When we opened the map of the live spots in the Gryffindor lounge, we saw Professor Forrest staring at us in front of the door."

Fred was shuddering when he recalled the terrifying scene now.

"We were frightened when we saw the professor and even forgot to hide the map, and then the professor took it away."

"But Professor Forrest gave us a chance at that time. He promised that as long as we performed honestly and properly, we would return the map to us."

"Yes, that period was almost the most well-behaved day in school when George and I were in school." Fred sighed, "If my mother saw her, she would definitely be very pleased and felt that we had become better."

"Although the professor extended the time for a while, at the end of the semester, he returned the map to us."

"It's just that before he returned the map to us, he seemed to have used some magic on it and removed his name."

Hearing them say this, Harry realized that there was really no Sherlock's name on the Living Points map.

George patted his shoulder.

"It's just missing Professor Forrest's name, and it's still very useful. We no longer need it, so I decided to give it to you!"

The two of them handed the map of the living spots to Harry, and said goodbye to him and prepared to go from the gate to Hogsmeade.

Harry looked at the map of the live spots in his hand, and his eyes gradually lit up!

Although he had experienced a lot of preaching from Sherlock, Harry's restless heart would not be easily changed like this.

He has always envied others for relaxing weekends in Hogsmeade Village, but he can only stay in the castle alone.

And now his chance to escape from here is finally coming.

The map of the Living Spot records all the secret passages from Hogwarts to Hogsmeade, and Harry can easily leave.

Where he is now, there is an entrance to a secret passage behind the hunchbacked old witch.

With excitement and a little guilt in his heart, Harry walked into the secret passage.

But this Hogsmeade trip was not as pleasant as he thought.

Just as Harry was heading to Hogsmeade through the secret passage, Sherlock was gently knocking on the door of Snape's office.

After the gloomy voice inside sounded "Come in", Sherlock pushed the door and walked in.

Even as Christmas approached, Snape was not idle. There was a crucible burning on the fire in front of him, and the potion in the pot was steaming "gudong gudong".

After seeing that the person coming was Sherlock, Snape looked a little surprised and had a mysterious smile on his lips.

"What are you looking for me?"

Sherlock didn't care what Snape was feeling now, so he took out a list from his pocket and put it on his desk.

"I need these materials, of course I won't take them in vain. I will give you how much I should pay."

Snape took the sheet of materials from the desk.

Sherlock did not cover up the potion materials. With Snape's eyesight, he could naturally tell which potion Sherlock was preparing to prepare based on these materials alone.

"Billy Viggo's sting needle, the secretion of the spotted earth, the flowing grass picked on the day of the full moon... Do you want to install the sad potion?"

Sherlock didn't comment.

“So do you have these materials here?”

Snape looked at him proudly, his eyes remained empty and cold, his drooping hair seemed to be painted with oil, and it seemed that he hadn't taken care of it for a long time.

"Ah, is it true that Forrest, you asked me for three such materials. As a colleague working in the school, how about I only accept you fifty Gallons?"

Sherlock looked at him with contempt.

"You're so dark."

"Do you want it?"

Sherlock took out his purse from his pocket and placed it on the table.

"There are thirty gallons here, and I'll give you the remaining twenty next time."

These materials are actually not worth the money at all, but several of them are difficult to buy in the magic world, not because of their scarcity, but because of the season when this material can be used. It is estimated that only magic potion masters like Snape will have backups in every season.

So even if he charged more than the normal market price, as long as it was not too much, Sherlock pinched his nose and accepted it.

Snape brought Sherlock three pieces of sad potion materials from his inventory of his potion materials. Just as he took the materials and was about to leave, Snape suddenly stopped him.

"Don't you want to know what potion I'm making?"

It is really rare to say this kind of seduce others to continue asking questions along with him and say them out of Snape's mouth.

Sherlock stopped, and he turned around and looked carefully at the boiling potion in the crucible. After thinking for a moment, he knew what Snape wanted to do.

The corners of his mouth curled up slightly, so he didn't rush to leave, so he sat directly on a chair in Snape's office.

"Oh, I'm sorry I don't have such a deep study of potions as Master Snape, but maybe I still have some understanding."

Sherlock pretended to look at the potion.

"If I'm not mistaken, this should be a pot of wolf poison, right?"

Snape's tone could be heard vaguely, and he couldn't wait.

"Yes, the effect of this potion is very uncommon."

"It's not common." Sherlock nodded, "Although werewolf cannot be completely cured, it is enough to be called the savior of werewolf."

Snape's impatientness seemed to be uncovered.

"Yes, the werewolf's savior. If all the people in the castle are normal, why would I still boil this pot of potion?"

Sherlock shrugged.

"How do I know?"

The expectation on Snape's face froze immediately, and he had a gloomy face.

"You can't use your brain to think about it!"

If this were not done before traveling through time, Sherlock would have pointed at his face and mocked him hard: He was anxious, he was anxious.

But now in Snape's office, if he really said that, the headlines of the Prophet Daily tomorrow will turn into the tragedy of magic education and the truth about the fight between two professors Hogwarts.

"I'm very busy every day, but I don't have much time to think about this. Why don't you tell me the answer directly, Snape, tell me why you want to make this pot of wolf poison potion." Sherlock said slowly.

Snape looked at Sherlock who was pretending to behave. Of course, he was not a fool, so he naturally saw the problem.

"You've guessed it long ago?"

Seeing that he found out, Sherlock stopped pretending to him.

"Thanks to your reminder, I have tried my best to talk so much about werewolf during the substitute class."

Snape stared at him.

"Since you know, why don't you reveal his true face? Don't you think that having a werewolf in Hogwarts is a hidden danger to the students!"

Sherlock sneered.

"You're earlier than I know? Why don't you go out and make me become this pioneer?"

Snape seemed to be gritting his teeth, but his face was invisible.

"I promised Dumbledore that I would hide this matter and not tell anyone."

"You have broken your promise. Even if you are just a reminder, it is a reminder, which makes me an insider."

Sherlock suddenly looked at him curiously.

"What kind of hatred do you have with Lupin? He looks pretty good. Why do you hate him so much? I wish you were exposing his identity and was kicked out of Hogwarts. Are you jealous of the position of professor of defense? No, he is just an assistant teacher, and you should be jealous of me if you want to be jealous of you."

In the office, the boiling potions were steaming. Snape stood in the dim light and clenched his hands tightly into his fists.

"Good person? Is this what you think of him?"

He did not drive Sherlock out of here in anger, or let him get out in a cold manner.

"Do you know what he almost did? He turned into a werewolf. His friends lured me over and locked me in the same room as him who was transforming! If it weren't for the last moment, one of them was afraid that they would drop out of school because of my death and let me go, then there wouldn't be Severus Snape standing in front of you now!"
To be continued...