That's right, Harry could indeed share his magic with others through a contract.
This ability was called "lending" by the Sorcerer Supreme, a unique power of Dimensional Lords.
The Chaos Magic within Harry was extremely special, primarily due to its incredible quantity.
According to the Sorcerer Supreme, the amount of Chaos Magic in Harry seemed to exceed that of some weaker dimensions, and it was growing exponentially with each passing moment.
If Harry could perfectly control the magic within him, he could easily destroy planets and become the most powerful Sorcerer Supreme.
But Chaos Magic was too disordered; chaos was its essence. In that other world, if Harry dared to use more magic than he could control, his magic would completely spiral out of control, causing irreversible and immense damage to the surroundings.
Once, the Sorcerer Supreme had taken Harry to a hell dimension. There, Harry had fully activated his magic, and his power had nearly torn that dimension apart.
Because of the disordered magic, there were many spells Harry couldn't use in that world, and lending was one of them.
It was impossible to know when Harry's magic would lose control. If it did, the borrower would be flooded with a massive amount of magic that their body couldn't handle, and they would explode like a balloon.
But in this world, although the amount of magic he could control had decreased, his control had greatly improved, making it almost impossible to lose control.
Therefore, after a period of study, he could lend his magic to others.
And Aunt Petunia, who longed for magic, would be his first borrower. This would not only fulfill her regret but also allow him to exact a "reasonable" revenge on the Dursley family.
The wicked smile on Harry's face grew more pronounced. "You must remember that the fundamental principle of the magical world is equivalent exchange. Since you are borrowing my power, you must pay a corresponding price. So, have you decided to borrow it and become a sorcerer?"
The Dursleys stared blankly at Harry's smiling, youthful face. It was the same face as always, but it no longer held any weakness, only a deep malice.
They felt as if they were signing a contract with a demon. Even knowing they might have to pay with their souls, they couldn't abandon their greed.
Gulp.
Aunt Petunia swallowed hard, looking fearfully at the nephew who was both familiar and strange to her. She asked in a trembling voice, "What price do we have to pay?"
Harry thought for a moment and replied, "Seeing as you're my relatives, I'll give you a 0.1% discount. Ten pounds for a low-tier spell, a thousand pounds for a mid-tier spell, and ten thousand pounds for a high-tier spell. You can also purchase permanent usage rights for a spell for a thousand times the original price. However, after casting a spell, you must shout 'I'm an idiot.' This is the price for casting!"
Hearing Harry's words, Aunt Petunia and Uncle Vernon looked at each other, asking with some confusion, "Is that all? No souls, lifespan, or anything like that?"
Harry rolled his eyes. "What would I do with your souls? How much are they worth? I'm not a dark wizard. Of course, if you want to use your souls as currency, that's also possible. I have a complete trading system, fair to all. Seeing as you're my relatives, each of your souls can be exchanged for the permanent usage rights of one high-tier spell."
"Permanent usage rights for one spell?" Aunt Petunia muttered, immediately starting to calculate. "One use of a high-tier spell is ten thousand pounds, so a thousand times that is ten million pounds! Oh my god, we're worth that much!"
Harry was speechless. Aunt Petunia's focus seemed a bit strange. He patiently explained, "You're not worth ten million pounds. It's only because you're my relatives that your souls are so valuable. So, what do you say? Want to trade with your souls?"
Harry's voice snapped Aunt Petunia out of her stupor over the huge sum of ten million pounds. She quickly shook her head. "No, no, no, we'll use pounds for the transaction."
Even though the purchasing power of the pound was strong at the time, just using mid-tier magic would be a heavy burden for the not-so-wealthy Dursleys. But it was definitely better than trading their souls.
After that, the Dursleys cleared out the room next to Dudley's and let Harry move in. After slightly modifying the contract's magic circle, Harry signed the contract with the Dursleys.
The contract had only one clause: The right of interpretation for this contract belongs to Harry Potter.
The Dursleys were very dissatisfied with this, but they were forcefully suppressed by Harry and could only sign it obediently.
Harry's exact words were, "You might as well sign it. You don't want to be Muggles for the rest of your lives, do you?"
Yes, the word "Muggle" was also something Harry had heard from Aunt Petunia.
It was clearly a derogatory term for ordinary people, which lowered Harry's impression of this world's magical community.
The Sorcerer Supreme would never discriminate against mortals, and as her closest disciple, Harry naturally felt the same way.
After signing the contract, the Dursleys spent fifty thousand pounds to purchase the usage rights for five low-tier spells: one each for his aunt and uncle, and three for Dudley.
It had to be said that his aunt and uncle spoiled Dudley too much. This was not good; it could easily lead to a child growing up crooked.
Therefore, Harry would teach Dudley a lesson whenever he had the chance, while his aunt and uncle watched, daring not to speak up.
After all, Harry had now completely replaced Uncle Vernon as the master of the Dursley household.
Soon, the neighbors and Harry's classmates noticed the change. The once-bullied Harry had suddenly turned the tables. The Dursleys, who used to hit and scold him, now treated him with the reverence of someone trying to please their boss.
Of course, what outsiders didn't know was that Harry had indeed become the Dursleys' boss, the kind who had signed a soul contract on the mystical side of things.
Time flew by. After receiving fifty thousand pounds in pocket money, Harry bought new clothes and threw away all his old things. In his redecorated room, Harry continuously studied magic circles, trying to modify them to master new spells.
With the help of his stable Chaos Magic, Harry successfully modified several magic circles, taking his power to the next level.
Time passed quickly. Just as Harry was starting to feel that life in this world wasn't so bad, he finally received the letter from the school Aunt Petunia had mentioned—Hogwarts!
"Harry, Harry, there's a letter for you!" Dudley came running over, handing the letter to Harry with a fawning expression.
After being repeatedly disciplined by Harry during this time, Dudley finally understood the pain Harry had once felt and was deeply remorseful.
Even though he was still being bullied by Harry, he now held him in the highest regard.
The magic Harry had bestowed upon him was too useful. Just telekinesis alone brought great convenience to his life.
Although his telekinesis was only a low-tier spell, capable of moving objects up to ten kilograms.
Harry took the letter from Dudley, glanced down, and saw the following words:
Mr. H. PotterThe Right-Side Bedroom, Second Floor4 Privet DriveLittle WhingingSurrey