One interesting plotline could be them teaming up to solve a mystery within Hogwarts that neither the Gryffindors nor the Slytherins are aware of on their own. For example, a hidden chamber that has secrets about the founders that could change the way the houses interact.
A possible plotline is that they are forced to work together on a project for a new class that combines both dark arts defense and potions. At first, they are reluctant, but as they start to understand each other's perspectives, they realize they have more in common than they thought. They might even find a way to create a new potion or spell together that helps protect Hogwarts from a new threat.
A great plotline is when they bond over their difficult family situations. Harry has his issues with the Dursleys and Draco has the pressure from his pure - blood supremacist family. They could find common ground in their struggles against the expectations placed on them. This might lead them to support each other in ways that surprise their classmates and teachers alike, like Draco standing up for Harry against Snape's unfair treatment, or Harry helping Draco break free from his family's dark influence.
One interesting plotline could be Harry and Cedric teaming up to solve a mystery within Hogwarts that the teachers are oblivious to. They use their combined skills, Harry's courage and Cedric's intelligence, to figure out what's really going on. For example, they might discover a hidden chamber that has been long forgotten and holds a powerful magical artifact. Another could be that they form a study group which then turns into a deep friendship. They help each other with their studies, especially in difficult subjects like Potions and Transfiguration. And finally, they could be united in trying to improve the relations between the different houses in Hogwarts. By being friends, they show that Gryffindors and Hufflepuffs can work together and be allies, rather than just competitors in the Tri - Wizard Tournament.
One possible plotline could be that they start to secretly help each other with their studies. For example, Draco might be struggling with a certain type of magic that Harry is good at, like Patronus Charms. In secret, Harry could give Draco some tips. Another could be that they team up to solve a mystery in Hogwarts that no one else is aware of. They might discover a hidden chamber or a secret spellbook together. They would have to keep their friendship a secret because of the rivalry between Gryffindor and Slytherin. Their friendship could also be tested when their respective houses are in competition, but they still find ways to support each other on the sly.
A possible plotline is that they are forced to work together due to their wolf mate bond in a situation that endangers the wizarding world. Maybe there is a dark magic threat that only their combined strength, as wolf mates, can overcome. This would not only test their relationship but also how the wizarding community views them. They could also face challenges from their families and friends who don't understand or accept their relationship.
One plot idea could be that they are forced to work together on a school project that requires them to explore each other's family histories. This makes them realize they have more in common than they thought. Another could be that they discover a secret magical realm only they can access together, and in the process, they form a bond. Or perhaps they are both framed for a crime and have to rely on each other to clear their names.
One possible plotline could be that Harry confesses his long - hidden feelings of friendship. Maybe after years of rivalry, he realizes Draco has a different side and he wants to start anew. He might confess in a moment of great danger, like when they are both facing a common enemy. This confession could lead to an uneasy alliance at first, as Draco is shocked but then slowly warms up to the idea of a real friendship with Harry.
One plotline could be them teaming up to outwit the Slytherins in a series of magical challenges. They use their combined skills, Harry's courage and Neville's knowledge of plants, to create obstacles for the Slytherins in a magical maze competition.
Another plotline could involve a magical accident that binds their fates. Hermione and Draco find themselves magically married against their will. At first, they are furious and try to find a way to break the spell. But as they get to know each other during this time, they start to develop real feelings. Hermione might teach Draco about the importance of equality and he could show her some of the more nuanced aspects of Slytherin culture.
One common plotline is a magical duel over a school competition. Maybe it's for the House Cup, and their fight gets intense as they both use their unique spells. For example, Harry might use his Patronus charm while Draco counters with some dark - arts - inspired hexes.
A great plotline might involve a magical competition where Draco, Blaise, and Harry are all forced to compete. As they face various challenges, they start to understand each other better. For example, they realize that they all have the same fears about the future of the wizarding world. It could also be a plotline where they are all transported to an alternate dimension and have to rely on each other to get back home.