A really interesting plot would be the development of their relationship. At first, they might start as strangers bound by a contract. But as they get to know each other, they could discover shared interests. For example, they might both be interested in certain magical theories. Their relationship could grow from obligation to true love, with lots of ups and downs along the way, such as misunderstandings caused by the secrecy of the betrothal contract.
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 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.
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.
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.
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 they initially resist the betrothal. Harry is suspicious of Daphne because of her Slytherin heritage, and Daphne thinks Harry is just a fame - seeking Gryffindor. But as they are forced to spend time together for various magical tasks assigned by their families, they start to see each other's true natures and gradually fall in love.
Maybe there could be a plot where they face opposition from some quarters. Some might not approve of a union between Harry and Daphne due to their houses' historical rivalries. They would then have to overcome these prejudices and prove that their love is stronger than the old grudges. This could involve them going on a quest together to show that they are a united front and are meant to be together.
One idea could be that they meet in a magical library. Harry is researching a rare spell and Daphne is there looking for knowledge on potions. Their eyes meet, and from that moment, a connection begins. They start secretly meeting to exchange their findings, and slowly, their relationship blossoms into love, leading to marriage.
One plot idea could be that Harry and Daphne are both orphans in the wizarding world, though Harry's situation is more well - known. They meet at an orphanage for magical children. Daphne is often overlooked because she is a girl and from a family that has some dark rumors. Together, they discover a hidden room in the orphanage that has a magical portal to a world full of strange and wonderful magical creatures. This shared discovery bonds them and they start to rely on each other for support and friendship.
One idea could be that Harry and Daphne's baby has some unique magical abilities that are a combination of their genetics. For example, the baby might be able to communicate with magical creatures in a way that neither Harry nor Daphne can. Another plot could be centered around the challenges they face as new parents in the wizarding world, like dealing with over - protective relatives or the paparazzi - like wizarding press.
Well, one possible plot development could be the initial struggle between Harry and Daphne as they are forced into this marriage contract. Harry, being 'evil' in this context, might try to use the contract to his advantage in the wizarding world's power games, while Daphne has to find a way to protect herself and her family's interests. Another aspect could be how they gradually learn about each other's true selves beneath their public personas, leading to unexpected alliances and perhaps even a real relationship developing despite the rocky start.