One interesting plotline could be them sharing a flat in London after the war. They support each other through their post - Hogwarts careers, Hermione in the Ministry perhaps, and Harry as an Auror. There are little domestic moments like cooking together or discussing the latest wizarding news over breakfast.
Another plotline could be that they inherit a large wizarding manor together. They decide to live in it and renovate it. Along the way, they discover old secrets about the place and also about their own feelings for each other that they had been suppressing for years.
In some fanfictions, they live together as part of a secret mission. They have to pretend to be a couple to infiltrate a dark wizard's organization. This leads to a lot of awkward and also sweet moments as they get closer while trying to keep up the act.
One interesting plotline could be them working together to solve a mystery within Hogwarts that the regular faculty can't handle. They combine their unique skills - Harry's courage and leadership, Hermione's intelligence and Draco's knowledge of the Slytherin side of things. For example, they might be on a quest to find a hidden magical artifact that has been causing strange occurrences in the school. This forces them to put aside their differences and really function as a pack.
Some fanfictions explore a different relationship dynamic between them. Maybe Harry has a problem that only Hermione can understand and help him with, and this brings them closer in a way that's different from their normal friendship. It could be something related to his connection with Voldemort or his family history.
One possible plotline could be Harry trying to hide his wizarding past from his muggle friends and coworkers. For example, he might accidentally use magic in a moment of panic and then have to cover it up.
One interesting plotline could be Harry learning the pure - blood traditions from the Malfoys in a different way than he expected. He might gain a new perspective on the wizarding world's social hierarchy.
One interesting plotline could be them discovering their sisterhood in a magical way. For example, they might find a long - lost family heirloom that reveals their connection. Another could be them teaming up against a common enemy in Hogwarts, using their combined knowledge and unique skills. Hermione's academic prowess and Luna's out - of - the - box thinking would make for a great duo.
One interesting plotline could be Hermione struggling to control her new vampire instincts while still trying to be the top student at Hogwarts. For example, she might have a hard time resisting the urge to drink blood during her classes or exams, adding a whole new layer of difficulty to her academic life.
A possible plotline is that Hermione secretly marries a character who has a dark past. Maybe he was once involved with the Death Eaters but has reformed. They keep their marriage a secret because they know the wizarding community won't easily accept it. Hermione, being the strong - willed character she is, believes in his change and is willing to take the risk. In other fanfictions, Hermione might marry a character who is not from Hogwarts, like someone from Beauxbatons. They keep it a secret because of the potential rivalry between the two schools.
A common plotline might involve Hermione's unique magic abilities being enhanced or influenced by Snape. Since she is 'gifted' to him, he could take it upon himself to train her in more advanced magic. This could include teaching her some of his own self - created spells or guiding her in the study of dark magic defense in a way that the other professors haven't. Their relationship might become a mentor - mentee one at first, but then develop into something more complex as they grow closer through their shared magical experiences.
In some fanfictions, it might be a situation where they are forced to work together in a bathroom renovation project at Hogwarts. They enter the shower area to check on the new magical plumbing. There, they discover a hidden magical artifact. This discovery makes them realize they need to rely on each other's skills, Hermione's book knowledge and Draco's knowledge of dark artifacts. As they search for more information about the artifact in the shower area, their relationship begins to change.
One interesting plotline could be Hermione predicting major events in the wizarding world before they happen. For example, she might foresee a new dark wizard rising and start preparing the Order of the Phoenix for it. Another could be her using her seer abilities to help her friends in their personal lives, like seeing that Ron is about to make a big mistake and intervening. And sometimes, she might see visions related to the secrets of Hogwarts, leading to new adventures and discoveries within the school.