Rated M
Platform: Fanfic.Net
Words: 812k
Synopsis: A different upbringing leaves Harry Potter with an early knowledge of magic and a view towards the Wizarding World not as an escape from the Dursleys, but as an opportunity to learn more about it. Unfortunately, he quickly finds that there are many elements in this new world that are unwilling to leave the Boy-Who-Lived alone.
Can't copy chapters from FF.net either so you'll have to check it out.
Link: https://www.fanfiction.net/s/11669575/1/For-Love-of-Magic