Well, it could be an original character who was hidden away from Magneto for some reason. Maybe a human - mutant hybrid that Magneto didn't know about. This son could have powers that are not fully developed at first, and through his encounter with Magneto, he starts to discover and master his abilities. He could be a character who was raised by a family that was against Magneto's ideas, so there's a lot of conflict when they meet.
There's also a fanfiction where Magneto senses danger approaching Quicksilver during a battle. He quickly creates a magnetic field around Quicksilver to keep him safe. This story really delves into the father - son relationship between them, highlighting Magneto's instinct to protect his son.
You can start by looking on fanfiction.net. It has a large collection of X - Men related fanfictions, and there are likely many that focus on Magneto being protective of Quicksilver.
The plot could involve Magneto's son being on a mission to stop Magneto's more violent plans. When they meet, it's a clash of ideologies. Magneto believes in a more forceful approach to mutant rights, while his son believes in peaceful coexistence. However, during their interactions, they both learn from each other. The son might show Magneto that there are humans who are willing to accept mutants, and Magneto might teach his son about the importance of standing up for mutants in a tough world.
You can try searching on some well - known fanfiction websites such as Archive of Our Own (AO3) or FanFiction.net. Just type in the relevant keywords like 'Harry Potter Magneto son' and browse through the results. However, not all fanfictions are of high quality, so you may need to read some reviews or summaries before choosing which one to read.
Sure, there could be. Fanfiction is all about creativity and bending the rules of established universes. This particular concept is quite wild. It might start with a scenario where, perhaps, some sort of magical - mutant hybrid experiment led to Harry being Magneto's son. The story could then explore how Harry, growing up with Magneto as a father, would change his view of the world. His relationships with other characters from both universes, like Hermione and the X - Men, would be completely different. It could be a very exciting read for those who enjoy exploring new and unexpected combinations of their favorite fictional worlds.