Well, 'harry potter is a de fanfiction' could be a misphrased or misinterpreted statement. Harry Potter is a highly successful and original fictional series. Fanfiction usually refers to stories written by fans based on existing works. Potter has inspired a ton of fanfiction, but it itself is not fanfiction. Maybe 'de' is a wrong or unclear addition here. It could be that the person who said this has some very different understanding of what constitutes an original work versus fan - made work.
It's popular because it offers a new perspective. We get to see the familiar Harry Potter world through the eyes of a de - aged Harry, which is different and exciting.
Well, 'l'asservissement de harry potter fanfiction' might be about exploring themes of domination and subjugation in the world of Harry Potter through fan - written stories. It could involve a dark wizard taking control over other characters, perhaps using magic in a way that forces them into a state of servitude, which is a rather dark and interesting concept to explore in fanfiction.
One possible fanfiction idea could be that Albus Severus Potter is accidentally de - aged by a misfired spell in Hogwarts. He then has to navigate the school as a much younger version of himself, causing all sorts of chaos and confusion. His friends and teachers are initially shocked but then have to figure out how to reverse the spell.
Harry Potter himself is quite popular. Since he's the main character, seeing him in a de - aged state offers a lot of storytelling possibilities. Hermione Granger is also a common choice. Her intelligence at a younger age could lead to different adventures. And then there's Draco Malfoy. Writers like to explore his character when de - aged as it gives a chance to rewrite his early interactions with the other characters in a new light.
I'm not entirely sure what 'de' means in this context. But generally, if someone were to say Harry Potter is fanfiction, they'd be completely wrong. Harry Potter was created by J.K. Rowling as an original work. Fanfiction is when fans take existing characters or settings from a work and create their own stories. Harry Potter has its own unique plot, characters, and world - building that was all created from scratch, not as a derivative fan - based work.
One great 'de aged Harry Potter fanfiction' is 'The Boy Who Lived Again'. It has an interesting plot where Harry is de - aged and has to deal with the wizarding world in a new way. Another is 'De - Aged Harry's Adventure' which shows his interactions with his friends when he's younger again in a really fun way.
I'm not aware of any specifically named popular stories with this exact concept. However, the Harry Potter fanfiction world is vast, and there might be some out there that deal with themes of enslavement in one way or another.
One common theme is redemption. With Draco being de - aged, it gives him a chance to start anew and make different choices, often leading to a path of redemption. For example, in some fanfictions, he might befriend characters he used to bully.
One great fanfiction in this genre is 'The Younger Malfoy'. It shows an interesting dynamic between a young Draco and Harry. They end up having to work together in a situation where Draco's de - aging has caused a stir in the wizarding world.