A third plotline might be about Harry trying to break the betrothal contract. He could feel that it's restricting his freedom and preventing him from being with the person he truly loves. This could lead to a whole adventure of finding loopholes in the wizarding laws regarding betrothals and facing the consequences of going against an old and powerful contract.
One interesting plotline could be the discovery of the betrothal contract and how it throws Harry's life into chaos. Maybe he has to deal with a whole new set of expectations and relationships he never anticipated.
A great plot in this type of fanfiction might involve the betrothal contract being a key to unlocking some long - forgotten magic. Harry and the other character involved in the contract (let's say it's a character from a different magical school) have to work together to figure out how to use this magic to defeat a new dark threat. They start off not getting along because of the forced betrothal, but as they learn more about the magic and each other, they develop a real bond.
One idea could be that the betrothal contract is used as a political tool to unite two wizarding families or factions. This might lead to Harry having to navigate complex political alliances and power plays within the wizarding world.
One idea could be the challenges they face in accepting the betrothal at first. Harry might be hesitant due to his loyalty to his friends and the wizarding world's expectations. Daphne, on the other hand, could be dealing with her family's pressure and her own feelings towards Harry.
One interesting plotline could be how Harry and Draco initially react to the marriage contract. Harry might be shocked and resistant as he has always seen Draco as an adversary. Draco, on the other hand, might be more accepting due to his family's traditional views. Another plotline could involve them trying to keep the contract a secret from their friends and Hogwarts community, which would lead to some comical and tense situations.
Obviously, Harry Potter himself is the central character. His betrothed could be someone like Ginny Weasley in an alternate take on their relationship. Or it could be a completely new character created for the fanfiction, perhaps a powerful witch from a foreign wizarding school who has a betrothal contract with Harry as part of an international alliance.
There might also be other characters who play important roles. For example, Daphne's family members. Her parents or sisters could be involved in the story, perhaps influencing her decisions regarding the betrothal. And of course, Harry's friends like Ron and Hermione could also be part of the story, either supporting or being skeptical about the betrothal.
One possible plotline could be the chaos that ensues when a marriage contract is suddenly revealed and multiple characters are involved in the harem situation. For example, Harry might have to navigate his relationships with Hermione, Ginny, and perhaps some other female characters like Luna. There could be a lot of drama as they all try to figure out their places in this new arrangement.
One interesting plotline could be the political implications of multiple marriage contracts within the wizarding world. For example, how different families use these contracts to gain power and influence. Another might be the personal relationships that develop among the characters involved in the contracts. They might start off as reluctant partners but grow to care for each other in unexpected ways.
One common theme is the struggle against tradition. The betrothal contract often represents an old - fashioned wizarding custom that the characters have to come to terms with. For example, Harry might not be happy about being bound by such a contract in a modern - day Hogwarts.