Maybe in the fanfiction, as they grow, they start a secret magical project. They combine their knowledge of different magical subjects, like Hermione's expertise in Transfiguration and Harry's talent in Defense Against the Dark Arts, to create something that changes the wizarding world for the better. For example, they might develop a new spell that can protect against all kinds of dark magic without harming the caster. And they have to keep it a secret at first because they don't know how others will react.
One interesting plot could be that as they grow up, they discover a new magical ability together that no one else has. This new power helps them solve mysteries in Hogwarts that even Dumbledore couldn't figure out.
One interesting plot could be Hermione's growing friendships. She might form closer bonds with some characters that were just acquaintances in the original story. For example, she could become really good friends with Neville and help him gain more confidence in his magical abilities.
Well, clearly Harry and Hermione are the main characters. Harry, the boy who lived, with his courage and natural talent for facing dark magic. And Hermione, the brilliant witch, with her vast knowledge of magic and her logical thinking.
One possible plotline could be Harry learning all the unique Weasley family traditions. For example, he might participate in the annual Weasley family Quidditch match and discover new strategies from the Weasleys. Another could be his relationships with each Weasley sibling growing in different ways. He could have a really close bond with Ron as they grow up together, and also form special friendships with Ginny, Fred, and George. Maybe he gets to help Molly Weasley in the kitchen and learns some secret family recipes too.
One interesting plotline could be Sirius teaching Harry advanced magic in secret. For example, Sirius might show Harry how to perform Patronus charms earlier than he does in the original story. This would give Harry an edge in dealing with Dementors and other dark creatures.
One interesting plotline could be their adventures at Hogwarts together. They might study for exams in the library, and Harry could discover new spells with Daphne's help. Another could be them facing challenges like the Triwizard Tournament side by side.
One possible plotline could be Harry making new and unexpected friendships. For example, he might befriend a shy Hufflepuff student who has a hidden talent for magic that helps Harry in some way. Another could be Harry exploring parts of Hogwarts that are usually off - limits, like a long - forgotten attic filled with old magical artifacts.
In this type of fanfiction, a common plotline is Harry dealing with the after - effects of the war. He might have PTSD and have to learn how to cope with it while also trying to move forward in his life. His growth as a person could also involve him mentoring younger wizards, passing on his knowledge and experiences. And perhaps there are stories where he delves deeper into the history of magic, uncovering secrets that were previously unknown.
A possible plot is that Hermione, as a succubus, discovers a connection between her new form and an ancient magic in the wizarding world. Harry and Hermione then team up to explore this connection and in the process, they uncover secrets about the origins of magic that were long forgotten. This could involve delving into ancient texts and visiting mysterious places.
One interesting plot could be them exploring the wizarding world together as a married couple, solving mysteries that were overlooked in the original books. For example, they might discover a hidden chamber in Hogwarts that has secrets related to ancient magic.
One interesting plot could be Harry and Hermione getting married and having to deal with the challenges of raising a magical family in a post - Voldemort world. They might face issues like how to educate their children about the dark past while still letting them enjoy their magical abilities.