One possible storyline could be that they collaborate on a research project about magical creatures. Arthur's extensive knowledge of the wizarding world and Hermione's thirst for knowledge could make them a great team. They might travel to different parts of the wizarding world to study various creatures and document their findings.
Perhaps a storyline where they both are involved in a magical education reform. Arthur, with his family values and Hermione with her academic excellence, could come together to suggest changes to Hogwarts' curriculum. They might want to include more practical magic related to everyday wizarding life or more in - depth studies of magical history and its relation to modern - day magic.
One idea could be that they collaborate on a project to improve the living conditions of house - elves. Arthur could bring his knowledge of the wizarding world's traditions and Hermione her passion for social justice.
Another idea is that they meet during a time of crisis in the wizarding world. Bill, being an experienced wizard, and Hermione, with her quick thinking and vast knowledge, are brought together to help solve the problem. They initially clash because of their different approaches. Bill is more of a hands - on, practical type, while Hermione likes to research thoroughly first. However, as they face various challenges, they learn to combine their strengths. Bill might teach Hermione some self - defense spells that are not commonly known, and Hermione could help Bill understand the political implications of their actions within the wizarding community.
Another storyline might involve Ginny and Hermione teaming up to solve a mystery within Hogwarts. Maybe there are strange disappearances of students and they use their combined skills, Ginny's Quidditch - related quick thinking and Hermione's vast knowledge, to get to the bottom of it. They might suspect a hidden chamber or a rogue spellcaster. They start by interviewing students and staff, gathering clues from different parts of the castle, and finally unmask the culprit.
One idea could be a time - travel plot where Hermione somehow gets sent back in time and meets a younger Arthur Weasley. They could team up to solve a mystery that is related to the Weasley family's past and the wizarding world at large. This would allow for a lot of exploration of the wizarding world's history and the early days of the Weasley family.
One possible storyline could be that Hermione initially tries to suppress her feelings because she's aware of Bill's relationship with Fleur. But as they work together on some dangerous magical research, their mutual respect turns into deeper affection. Bill might start to see Hermione in a new light as well, which could lead to a love triangle situation with Fleur.
A storyline could involve the baby getting lost in a magical world. Arthur and Selenia then have to embark on a quest to find their baby. Along the way, they meet various interesting characters who either help or hinder their search. This would add an element of adventure to the fanfiction. It could also show how their love for their baby drives them to overcome all obstacles in their path.
One possible plot could be that Arthur Weasley accidentally uses some experimental magic that causes an unexpected interaction with Hermione. For example, his fingers might emit a strange energy that transfers some of his knowledge to Hermione in an unorthodox way, leading to a series of adventures where they have to figure out how to reverse or control this new connection.
It could imply a rather strange or non - canonical power dynamic in a fan - created story. In fanfiction, authors often explore unusual relationships and scenarios that deviate from the original source material. Maybe it's a story where Arthur Weasley has some form of control or ownership over Hermione in a very specific, fictional context.
The character dynamics can also be a challenge. Hermione is a very headstrong and intelligent character, while Arthur is more laid - back and family - oriented. Writers need to find a way to make their relationship work in a way that doesn't seem forced. They need to explore how their different personalities can complement each other and drive the story forward.
There may be some, but it's not a very widespread theme. Most fanfictions tend to focus on more common pairings or plotlines. However, in the niche corners of the fanfiction community, there could be a writer or two who have explored this idea. You could start by looking on large fanfiction websites and using specific search terms to see if anything comes up.