One interesting plot point could be how they manage to keep their relationship a secret in the wizarding world full of gossips. For example, they might have to use magic to create false alibis or avoid being seen together in public places like Hogwarts. Another could be the reactions of their friends and families when they eventually find out. Harry's friends might be surprised as Daphne is from a different social circle in the wizarding world.
Well, a plot point could be the challenges they face due to their different backgrounds. Daphne is from a pure - blood family and Harry is famous for defeating Voldemort. Their relationship might face opposition from some pure - blood supremacists. Also, they could have secret meetings in the Forbidden Forest or in hidden rooms in Hogwarts, which adds an element of mystery and adventure to the story.
In some fanfictions, an interesting plot point is the development of their relationship from initial attraction to deep love. Maybe they start by sharing a common interest in a particular type of magic or a Hogwarts subject. As they get closer, they have to deal with the fact that their relationship is against the norms of the wizarding society. This could lead to a lot of internal conflict for both of them, as they struggle between their feelings for each other and the potential consequences of being discovered.
One interesting plotline could be them secretly helping each other with schoolwork. Harry, with his practical knowledge from his adventures, and Daphne, with her in - depth understanding of pure - blood magic. They might exchange tips and spells in a hidden corner of the library.
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 plot development could be how Harry and Daphne first come to terms with their betrothal. Maybe at first they are reluctant, but as they spend time together, they discover they have more in common than they thought.
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.
A frequent theme is the challenges they face. For example, dealing with the prejudices of their respective houses. People in Gryffindor might not approve of Harry being with a Slytherin, and vice versa in Slytherin. Also, there's often the theme of adventure within the relationship. They might go on secret quests together, which not only deepens their bond but also tests their relationship.
Hermione could be a main supporting character. She might be the one who first suspects something is going on between Harry and Daphne. She could be either supportive or a bit skeptical at first. Ron could also be there, maybe providing some comical reactions when he finds out. And Daphne's sister, if she exists in the fanfiction, could play a role. She might be the one who helps them keep their relationship under wraps or, on the contrary, she could be the one who accidentally reveals it.