A plot could involve a magical curse that affects the three of them. Hermione and Malfoy start to see each other's perspectives more as they struggle to break the curse, with Harry being the one who discovers the key to the solution. Or perhaps there's a new magical tournament at Hogwarts and they have to team up. Malfoy's Slytherin cunning, Hermione's intelligence and Harry's bravery would all come into play as they compete against other teams.
One idea could be a time - travel plot where Hermione and Malfoy are sent back in time together and have to rely on each other to get back, while Harry is somehow involved in the events that led to their time - travel. Another could be a story where they are all part of a secret magical project that forces them to work together despite their differences. Malfoy might have some unique knowledge that Hermione respects, and Harry could be the mediator between their clashing personalities.
One plot idea could be that Abraxas Malfoy, being from an older generation, has some long - forgotten knowledge about Hogwarts' secrets. Harry discovers a diary or an old parchment left by Abraxas that leads him on a quest to find a hidden magical artifact within the school. This could involve Harry having to interact with the ghosts of Hogwarts who knew Abraxas personally.
One idea could be a time - travel plot where Harry Potter accidentally travels back in time and meets Abraxas Malfoy. He could try to change certain events related to the Malfoy family's future actions in the wizarding world. Another plot could involve Abraxas Malfoy leaving behind a mysterious magical artifact that Harry discovers. Harry then has to figure out what it does and if it has any connection to the dark past of the Malfoy family.
One plot idea could be that Lucius is forced to work with Hermione on a secret magical project for the Ministry. At first, they are at odds due to their different backgrounds and beliefs. But as they face various challenges together, they gradually come to understand each other. For example, they might have to deal with a powerful dark magic artifact that is causing chaos. Another idea is that in an alternate universe, Hermione is a spy in the Malfoy household and she has to pretend to befriend Lucius while secretly gathering information. This could lead to some tense and interesting interactions as Lucius is a shrewd character and Hermione has to be very careful not to be discovered.
One interesting plot idea could be that Harry teaches Scorpius advanced defensive magic. Since Scorpius is a bright young wizard, Harry sees potential in him and decides to pass on some of his own unique skills. Another could be Harry teaching Scorpius about the importance of friendship across house divides, using his own experiences with Ron and Hermione as examples.
Perhaps in a post - war scenario, Hermione is working on reforming the wizarding laws. Lucius, who has lost much of his power and status, is begrudgingly involved in the process. Through a series of debates and interactions, they develop an unexpected connection that challenges their long - held beliefs about each other.
One idea could be a time - travel plot where Hermione somehow gets sent back in time and has to deal with a younger Bellatrix. Maybe she tries to change Bellatrix's path to the dark side. Another could be a magical duel between Hermione and Bellatrix where Harry is caught in the middle, forced to choose which side to help. Or a plot where Bellatrix, under some sort of spell, has to team up with Hermione and Harry to fight a greater evil.
One idea could be that Harry discovers Narcissa has a secret mission to undermine Voldemort from within. Maybe she's been secretly helping the Order of the Phoenix all along and Harry stumbles upon this knowledge.
One idea could be that Female Draco, being a Slytherin, is initially at odds with Harry but then they are forced to work together on a secret project to save Hogwarts from a new dark threat. This would involve them gradually getting to know each other better and realizing they have more in common than they thought.
One idea could be that Harry is sorted into Slytherin instead of Gryffindor. He then has to deal with the prejudices within his own house as well as from other houses. Draco could initially be hostile but then they gradually become friends as they discover they have more in common than they thought, like their ambition and a desire to prove themselves. They could team up to solve a mystery within the Slytherin common room that is linked to the dark history of the house.
Well, they could be transported to an alternate magical dimension where the rules of magic are completely different. In this new place, they are seen as the only hope to restore order. Harry's quick thinking in dangerous situations and Hermione's vast knowledge of magic would be put to the test. They'd have to learn the new magic fast and find a way to get back to their own dimension while also saving this new one.