One common plotline is that Draco inherits some sort of ancient magic or a powerful artifact that gives him control over Harry. Another is that a dark wizard forces Draco to be Harry's master as part of a devious plan. Maybe to turn Harry to the dark side or use him for some evil purpose. And sometimes, it's just a result of a magical accident that binds them in this master - servant relationship.
One common plotline could be a healing scenario. Maybe Harry is injured and Severus uses his fingers to perform some kind of advanced healing spell on him. This could lead to a deeper connection between them as Harry realizes Severus isn't as bad as he thought.
In some fanfictions, the plotline could be that Draco and Harry adopt a child who is in danger from a dark wizard. They then have to go on the run, protecting the child and each other. It's a story of adventure and family. Also, there could be a story where they adopt a child who has a connection to an ancient magic, and they must figure out how to help the child control it while also dealing with their own relationship. Or perhaps they adopt a child who is a werewolf cub, and they face the stigma within the wizarding community while trying to raise the child with love.
A common plotline is how their friendship or rather new - found brotherhood affects the Hogwarts houses. Since Draco is a Slytherin and Harry a Gryffindor, their bond could start to break down the long - standing rivalries between the houses. They might work together to create a more united Hogwarts. Additionally, their relationship could change how they view the wizarding war. Instead of being on opposing sides as they initially were in the original story, as siblings they might try to find a more peaceful solution to the conflict.
One unique plotline is when Harry and Draco are magically bound to protect each other's families. It forces them to work together and Hermione is the mediator. They have to overcome their past enmity for the sake of their loved ones.
Well, a plotline might involve Snape trying to protect Draco more secretly. Since Draco is his son, he could be more involved in Draco's Hogwarts life. Also, there could be a plotline where Draco starts to question his identity and values. He has been raised as a Malfoy, but now with this new knowledge, he might try to understand Snape's side of things, like his loyalty to Dumbledore.
One common plotline could be in a romantic relationship context. Maybe Draco cheats on Harry with another Slytherin student, like Pansy Parkinson. This could lead to a big fight between Harry and Draco, with Harry feeling betrayed and angry. Harry might then go through a period of self - discovery, realizing he doesn't need someone who would be unfaithful.
Another theme is the exploration of different magical heritages. Draco from a pure - blood Slytherin family, Harry with his unique status as 'the boy who lived', and Daphne from another wizarding family. Fanfictions often look at how their combined magical knowledge and abilities are used within the marriage, like in 'Merged Magics' where they create new spells together.
A possible plotline is that they are forced to live together due to some magical circumstances related to their cousin - ship. This would make them get to know each other on a deeper level. Harry could learn about Draco's insecurities and Draco could see Harry's true self, not just the 'Chosen One' image. It could lead to a slow - burning friendship where they both have to overcome their initial prejudices. For example, Draco might start to see that Harry isn't just a Gryffindor hero but a complex person, and Harry could understand that Draco was a product of his upbringing and family expectations.
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.
One common plotline is the internal struggle Draco faces. He has been brought up in a family with certain beliefs that are against Harry, but his crush makes him question everything. For example, in some fanfictions, he might secretly protect Harry during a dangerous event at Hogwarts. Another plotline could be the slow - burn relationship. They start off as rivals but gradually Draco's feelings change and he tries to get closer to Harry in small, furtive ways like leaving anonymous helpful notes for him.