Perhaps a plotline where they discover a common enemy or goal that brings them closer together. This could be something related to the dark forces in the wizarding world. They then have to work together secretly to combat this threat while hiding their relationship.
Another plotline could involve the challenges they face due to their different backgrounds. Harry being a Gryffindor and Draco a Slytherin, their houses have long - standing rivalries. They would need to overcome these differences and the prejudices of their fellow students.
In some 'Harry and Draco secret child fanfiction', there could be a plotline where the child serves as a bridge between the two families. Harry's side, like the Weasleys, and Draco's family might initially be against the idea of the child. But as the story progresses, the child's presence changes their perspectives. The child might also struggle with its own identity, being part wizard from two very different backgrounds, and this internal struggle could be a central part of the story.
One possible plotline could be a story of redemption. Maybe Draco spanks Harry as a form of discipline in a situation where Harry has made a serious mistake that endangers others in their wizarding world. This could lead to Harry reflecting on his actions and growing as a person.
Well, a plotline might involve Tonks using her Metamorphmagus abilities to secretly meet Harry in different disguises. This adds an element of mystery and fun to their relationship. They could also be sharing secrets about their past traumas, like Harry's experiences with Voldemort and Tonks' insecurities, which deepens their bond on a more emotional level. Maybe there's a sub - plot where they have to keep their relationship from Tonks' family, especially her Auror colleagues who might not approve.
One possible plotline could be Draco secretly protecting Harry from dark wizards without Harry knowing. For example, he might use his knowledge of the Death Eaters' plans to foil their attempts on Harry's life.
Another plotline could involve the challenges they face in their relationship due to their different personalities. Booth being more impulsive and Brennan being more logical. They might have arguments about how to handle certain situations in their personal lives as well as in their work. But through these challenges, they grow closer and understand each other better.
One plot idea could be that they are secretly helping each other in their respective tasks. For example, Draco might be secretly passing information to Harry about some Death Eater plans while pretending to be on their side still. Another could be that they discover a hidden magical bond between them that draws them together in secret. They might meet in a secluded part of Hogwarts, like the Room of Requirement, to explore this bond without others knowing.
One interesting plotline could be them working together secretly on a magical project that could change the wizarding world. They might start off as rivals but gradually find common ground and develop a deep bond as they work towards the same goal.
One interesting plotline could be that they discover their twin relationship early on and try to keep it a secret from everyone at Hogwarts. They might secretly help each other out in classes and with their rivalries against other houses.
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.
One interesting plotline could be Harry and Draco being deaged and having to rely on each other in a world that seems new to them again. They might form an unexpected friendship as they don't have the pre - conceived notions from their older selves. For example, they could team up to solve a mystery in Hogwarts that only they, with their combined knowledge from before, can figure out.