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Magic in Harry Potter's world is innate and inherited by blood, although sometimes children will be born to wizards who will not have magical power; but in this world where Kamar-Taj is also found, Sebastian did not know if those non-wizarding children would be disowned, after all in marvel there are ways to acquire magical power from other sources other than innate.

Besides Sebastian did not know the history of the magical world, and to think that the magical world would be the same in this world was a bit silly. Sebastian now regretted a little bit mixing the two worlds... the limits of magic in this world were high, which was good for him, but it meant that they were also high for people like Voldemort and other villains.

Although with Ancient One's existence it was impossible for someone to do something like global domination or something like that, but Ancient One wasn't interested in local or small conflicts, so it was hard for her to deal with Voldemort level characters, unless they did something too terrible to the world.

She also had to understand the situation of pureblood families, in the marvel world there are many dimensional lords and it wouldn't be uncommon for some wizarding families to worship him or get powers from them. In the Harry Potter book there doesn't seem to be much difference between being Muggle born and pureblood, but this is a more complex world and Sebastian had to be careful and act with caution. 

"Maybe I should have gone to the more fun and peaceful world..." said Sebastian with a sigh.

"I just hope it's not something too crazy... I don't want an evil Dumbledore or something..." he thought as he looked at the woman sitting in the living room with her parents.

The woman had arrived a short time ago and her name was very familiar to Sebastian, Minerva Mcgonagall.

This had been a relatively normal day for Mr. and Mrs. Granger, until a guest arrived at their house. 

We were all my family and Professor Mcgonagall, when she came back to introduce herself and say the reason for her visit.

"I am Professor Minerva Mcgonagall of Hogwarts School, and I came this afternoon to invite young Mr. Granger to attend our school," she said in a formal tone.

"I'm sorry Professor Mcgonagall, but I have never heard of Hogwarts school before" said Mr. Granger somewhat uncertainly.

Both Sebastian and Hermione were top students in their homerooms, and it was normal to go to a well known and prestigious school, but both Mr. and Mrs. Granger were unfamiliar with Hogwarts.

"That's normal, our school only accepts a few students and is not known in your world" the teacher answered him.

"Our world?" asked Mrs. Granger in confusion.

"Yes, you see our school is a school of magic, and it only accepts young wizards or witches" said Professor Mcgonagall.

 As she spoke she pulled out a wand and with a wave a cup that was on the table transformed into a small hamster, everyone could not help but be surprised by this. It was the first time they saw something so magical and that included Sebastian, really the magical branch of transfiguration is impressive, transforming objects and even making them move, is to tell the truth incredible.

Hermione couldn't help but reach over and pick up the little hamster in her small hands, it was a brown hamster and looked quite adorable.

"As you can see, magic is real and has always existed but it is a secret to most people" continued Professor Mcgonagall with a smile.

After some explanations about the magical world and some rules about how to keep everything secret, they agreed on a date to go shopping for the materials in Diagon Alley and then Professor Mcgonagall said goodbye.

From Professor Mcgonagall's explanation, I know that every child born before August 31 will receive a letter of acceptance to Hogwarts, and that the student will have to respond before July 31.

Today is August 1, and classes start on September 1, so I have a month to prepare for my future student life at Hogwarts. According to my calculations, I am one year older than the Weasley twins and one year younger than Percy Weasley, and when Hermione enters the school I will be in my fourth year.

*August 9th

Today was the day we would go to the famous Diagon Alley, the whole family was excited and so we got up early that day and then went to the meeting point given to us by Professor Mcgonagall. When we arrived at the place we had to wait a bit until the teacher arrived and took us to a pub called Leaky Cauldron, my parents couldn't see it as it had to was enchanted to keep muggles away, but both Hermione and I could see it.

"This is the Leaky Cauldron, usually only wizards can come then I recommend you come in the company of one of your children" he said as he came as Hermione was also a witch.

It was rare for a Muggle family to have a wizard born and in our family there were two, although if Sebastian remembered correctly there was one such case in the plot.

Leaky Cauldron was a somewhat old-fashioned pub, it was somewhat dark and in disrepair, which was reasonable considering it was built in the early sixteenth century. It was located on Charing Cross Street, Professor Mcgonagall didn't stop long in the old pub, and took us straight to the entrance of Diagon Alley. The entrance was behind the Leaky Cauldron in a small walled courtyard with a garbage can. Diagon Alley can be accessed by touching the correct brick on the wall behind the Leaky Cauldron (from the dustbin, three up and two across).

"You must remember the entrance well, after all next time they will have to come on their own" he said as he pointed out to Sebastian how to open the entrance.

"Welcome everyone to Diagon Alley" he continued with some excitement.