Perhaps it's a young writer who is just starting out in the world of fanfiction. They might be using Harry as a way to practice their writing skills and explore their creativity. They could be a student at Hogwarts in the fanfiction world, writing about their idol, Harry.
Maybe it's a fan who has been observing Percy from afar. This person could have created the fanfiction based on their own interpretations of Percy's personality, actions, and the things they've heard about him. They wanted to create a story that they felt was true to Percy in some way.
It could be a die - hard Percy Jackson fan who has a lot of creative ideas and wants to explore new aspects of the story. Maybe someone who has been reading the books since they were young and has always dreamed of adding their own twist.
It could be a new dark wizard who is secretly operating within Hogwarts. He might be trying to steal powerful magical artifacts and Harry and Luna get in his way.
It could be an experienced fanfic author who has written a lot about the Harry Potter series. They might have decided to write this particular story to add a different kind of interaction between the two characters. Maybe they noticed that there are not many stories about Harry helping Snape in such a specific way.
There could be many authors who might write such a fanfiction. It could be an amateur writer who just had a creative idea about this unique situation between Snape and Harry. Maybe someone who really likes to explore different relationships between characters in the Harry Potter universe.
It's hard to say who the author could be specifically. There are many fanfiction writers out there. It could be an amateur writer who is a big fan of the Harry Potter series and just wanted to explore this unique scenario with Astoria and Harry.
Lucy herself would surely be one of the main characters. And maybe she has a best friend in the story, like a character named Lily who helps her through all the challenges.
To protect the person she loves. If she's in a dangerous situation, like there are still dark forces around, a secret marriage could be a way to keep her loved one safe from being targeted by the enemies.
His wife could be a former Hogwarts student he met during his own school days. She might be from a different house and they fell in love secretly.
Edward is a likely candidate. Since he is so attuned to Bella, he might pick up on some strange behavior or scent that leads him to suspect she is hiding something.