As soon as Christmas passed, it was time for Sherlock to give Harry a tutoring time.

When Harry came to Sherlock's office that night, he was in a bad mood.

Because Hermione reported to Professor McGonagall, the professor asked him to take away the "fire crossbow" he received and checked the broom "spotted" of the flying broom.

Although Harry knew Hermione was for his own good, he still couldn't help but get angry with her in his heart.

Sherlock obviously noticed Harry's emotions, and he said with a magic wand knocking on the table.

"I suggest you better clean up your mood and adjust your mood to be more pleasant, because I invited a special gentleman to be your sparring student today."

Harry was immediately attracted by Sherlock's words.

"Who is it? Professor Lupin?"

"How could Lupin be the coach of your patron sage?"

Sherlock shrugged. Instead of keeping a secret, he waved his wand gently at the cabinet at the corner of the wall. The silver thread tied to it disappeared immediately, and a black-robed creature like mud rolled out inside.

Harry was stunned at first when he looked at this thing. After he carefully observed the creature that had collapsed into a circle on the ground, he realized that this was actually a living dementor!

After seeing its species, Harry stared at him and subconsciously jumped back.

"Teacher, professor! What you mean by sparring is it!"

The half-dead dementor, who had been tortured by Sherlock for the past two days, wriggled on the ground for a long time before floating around.

It will not die, and it has extremely strong self-healing ability. Even if it does not eat, it will slowly recover its strength. Of course, if you eat enough food, it will recover faster.

Hearing Harry's question, Sherlock nodded.

"Some time ago, I invited this gentleman to visit my office outside Hogwarts. Not only did he agree generously, he also politely expressed his desire to repay me. Then I asked it to help me a little, and by the way, he became your sparring training."

Hearing Sherlock's words, Harry showed a look of believing you.

These days he also knows how well the creatures like Dementor are, and knows that they cannot communicate at all under normal circumstances, let alone invite them to come back as guests, and they will also have to pay back.

This must have been captured by Sherlock directly.

Just as they were talking, the dementor had slowly recovered some energy. It felt that in this room, in addition to the demon, there was also a fresh and delicious food producer.

It dared not provoke the evil demon, but it greedily wanted to absorb the fragrant happiness and hope of Harry.

Harry also felt his body was so cold that his mother's pleading before her death sounded in his ears again.

The dementor floated over from the cabinet, a vague, transparent tulle-like thing connected it and Harry.

Sherlock did not take action to stop the Dementor from absorbing Harry's positive emotions, but instead shouted loudly to wake Harry, whose eyes had become disintegrated.

"Use the patron saint spell I taught you!"

Harry suddenly woke up from that state of loss of consciousness, but he still felt the coldness from the bottom of his heart, and his whole body couldn't help but tremble.

He gritted his teeth and raised his wand to aim it at the dementor who was still slowly floating towards him, waved his arms and recited a spell.

"Hu God Guard!"

But no light thread emerged from the tip of his staff, and the dementor was not affected at all, but had already floated in front of Harry!

At this moment, a silver light wire suddenly tied it up, then the thread retracted, and the next moment it pulled the dementor back into the cabinet, and finally closed the cabinet door again.

Harryna's already empty eyes regained his spirit, and he gasped for breath as if he had just walked back from the brink of death.

Sherlock put down his wand and handed him a cup of hot cocoa that had been prepared on the table.

Harry took the cup with his trembling hands and said sadly.

"I'm sorry, professor, as soon as I saw it, my mother's voice sounded in my ears, making it impossible for me to concentrate and use the guardian spell."

Sherlock had long expected this.

The feeling and experience of using the patron spell under normal practice is completely different from using the patron spell when facing dementors.

The despair aura emitted from the dementor was enough to shock the wizard.

It made them unable to recall any happy emotions from their minds, which led to the spell that might have been used, but at the critical moment, they could not use it.

But also under the high pressure of the dementors, it will be easier to stimulate the potential of the wizards. When they overcome the influence brought by the dementors themselves, it will be of great help to the learning and use of the guardian spell.

Sherlock comforted Harry.

"When you face a dementor, you have to bear much more fear than others. But such emotions can also become your motivation, Harry. Don't think about the despair when your mother begged, think about the courage and strength she showed when she wanted to protect you. She should not be the resistance to your patron curse, but your motivation."

Harry held the hot cocoa from the cup and listened to what Sherlock said to him, his eyes gradually became more and more firm.

He sat in the chair and rested for a while, and stood up.

"I want to try again, professor."

Sherlock naturally met his request. He waved his wand again, the cabinet door was opened again, and the dementor was untied again and slowly floated out of the cabinet.

But after it came out this time, it shrank aside and didn't dare to move forward at all.

Even if your thinking is simple, it does not mean that the dementor is just a fool.

It clearly knew that the tempting food was simply a bait! It could only be watched, and before it could be sucked into its mouth, it was about to be locked back into the cabinet by the demon.

So this time it is not going to be fooled again.

Seeing that it did not cooperate, Sherlock couldn't help but raise his eyebrows, and a silver thread shot out from the tip of his staff, trapping it directly in front of him.

But even so, the dementor still did not cooperate. It restrained its desires and no longer showed a eating posture, but just exuded the coldness it could not control.

Faced with its non-violent and non-cooperating attitude, Sherlock naturally did not swear by it, and directly tightened the light wires that tied it, and threatened.

"You cooperate honestly. When my students learn the spell, I will let you go. But if you don't cooperate, then when my experiment is over, I will throw you into the black market and sell it to other wizards!"

The dementor seemed to understand his words, trembled all over, and hesitated to show Harry's preparation for eating again.

When Harry saw Sherlock bullying this dementor like this, he couldn't help feeling pitiful for it, and his fear of it was not that strong.

It was the biting cold again. This time Harry tightened his wand. When the dementor began to suck the positive emotions in his body, his mother's voice sounded in his mind again.

He did not tremble anymore, but instead tightened his body and steadily waved his wand.

"Hu God Guard!"

The pronunciation of the mantra is perfectly in line with the tone that Sherlock taught him, without any error.

The next moment, a huge silver shadow suddenly ejected from the tip of his wand, which hovered between him and the dementor. Although Harry felt his legs were so weak, he was still standing by himself, although he didn't know how long he could stand.

At the same time when Harry's patron spell came into play, the dementor was extremely skillful and desperately dodged backwards, and finally retracted into the wooden cabinet that was usually used to store it.

After seeing that Harry had taken a huge step towards success, Sherlock did not hesitate to praise him and clapped his hands.

"Very good Harry, I didn't expect you to make progress so quickly while bearing the pressure!"

This was indeed beyond Sherlock's expectations. He thought it would take some time to summon the prototype of the guardian god, but he did not expect that it would be so effective under the pressure of facing the dementor, which made Harry do this now.

He took another piece from the drawer and handed it to Harry for the chocolate he had prepared before.

"Eat these, you've done it well, and the rest is just a long-term practice and familiar with that feeling."

But Harry didn't seem very excited.

"I still haven't summoned the guardian like you, Professor."

Sherlock laughed in silence.

"Don't be too harsh on yourself. Do you know how long it took me to learn the patron sacred spell?"

Harry looked at him in confusion, and Sherlock stretched out a finger at him.

"It took me a year to fully master this spell. If you can use it in less than a month of learning, wouldn't it seem like my talent is awful?"

Harry said in a depressed manner.

"You must have no one to teach you, and no one will capture the dementor as a sparring training for you."

Sherlock shrugged.

"Even if you include these, you are already excellent enough Harry. There is no shortcut to achieve it overnight. If you want to master the power you can control, what you need is long-term persistence."

Harry looked around at the magic books in the three rows of bookcases in Sherlock's office, and could feel that what Sherlock was talking about was what he was doing.

"I will work hard, professor!"

"Let's work hard next week. It's too late now, and you're very tired. Let's go back and rest first."

In the darkness, Harry returned to the lounge in Gryffindor.

He did not tell Sherlock about Black's discovery. He did not mention this matter again these days. Hermione and Ron thought he had forgotten it, but in fact he had always kept it firmly in his heart, but he could only remember it in his heart.

After the Christmas holiday, the students returned to the castle, making Hogwarts lively again.

With the start of the second half of this year, students in fifth and seventh grades have also entered the final sprint stage before the grade exam.

Sherlock made an orderly study plan for them so that they could almost waste their time every day.

Even George and Fred, who are usually the most naughty, are now working hard. This is not their conscience. They want to get a good grade and find a job in the Ministry of Magic.

But the learning atmosphere around has changed.

When all the fifth-grade students were learning, no one appreciated their pranks, and no one cheered their creativity, Fred and George unknowingly joined everyone.
To be continued...