Fanfiction about Harry and Draco being secretly friends: What could be the possible plotlines?

One possible plotline could be that they discover they have more in common than they thought. Maybe they start working together on a project in the wizarding world, like researching a long - forgotten magic. As they spend time together, they realize their feelings for each other have changed from hatred to love. To avoid the chaos that would ensue from their families and friends' reactions, they decide to marry secretly. Another idea is that they are forced into a situation where they have to pretend to be married for some magical reason, like protecting a powerful spell or object. During this time, they start to really fall for each other and end up making it a real, secret marriage.

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.

One possible plotline could be that Harry discovers Snape's true motives much earlier. Maybe he stumbles upon Snape's memories that show his complex relationship with Harry's mother. This new understanding makes Harry see Snape in a different light. They start to have secret meetings where Snape teaches Harry advanced magic, away from the prying eyes of others at Hogwarts. Their relationship gradually evolves from one of enmity to an unspoken bond.

One possible plotline could be that Natsu has been secretly married to a character from his past. Maybe it was a rushed decision during a dangerous adventure, and they kept it a secret to protect each other. As the story unfolds, his friends start to suspect something is different about him. He becomes more cautious and less reckless, which is out of character for him.

One possible plotline could be that Deidara has been hiding her true gender to fit into a male - dominated group or organization. She might be constantly worried about being discovered and having to face the consequences. Maybe she uses her art as a way to express her true self in a more subtle manner.

One possible plotline could be that Harry betrays Draco in a duel. Maybe there was some sort of misunderstanding or a secret deal that Harry made with someone else that required him to turn on Draco during the duel. For example, if there was a dark wizard threatening Harry's friends and the only way to save them was to sacrifice Draco in the duel by using a forbidden spell against him.

One possible plotline could be that they fall in love gradually. Maybe they start as friends who bond over shared interests or experiences in the wizarding world. As their relationship deepens, they decide to keep it a secret to avoid unwanted attention or interference. Another aspect could be how they deal with their families. Harry has his own complex family history and Daphne might have expectations from her family. They would need to navigate these challenges while keeping their marriage under wraps.

Maybe they meet in a secret place during their school years, away from the prying eyes of their classmates. They start to exchange ideas and knowledge, which gradually turns into a deep emotional connection. This connection then leads to a secret marriage, and they have to deal with the consequences of hiding it from everyone they know.

One possible plotline could be that Harry, through some magical accident or inheritance, comes to own Draco's family manor. Draco is then forced to interact with Harry on Harry's terms to regain his family's pride. Another could be that Harry wins a bet against Draco and the terms of the bet are such that Harry now has ownership over Draco's time, making Draco do tasks for Harry.

One possible plotline could be that Harry has some sort of misunderstanding. Maybe he believes Draco is involved in a dark plot that endangers Hogwarts. So, in a rash moment, he kidnaps Draco to interrogate him. But as he does this, he realizes that Draco might be innocent and then has to deal with the consequences of his actions.