Well, perhaps Daphne and Harry are paired up for a dangerous mission. They have to rely on each other closely and develop a strong bond during the mission. Hermione, seeing this new closeness, gets jealous. She starts to act out of character, trying to insert herself into their activities. Maybe she even tries to convince Harry that Daphne has ulterior motives.
Harry might be really confused at first. He doesn't understand why Hermione is acting so strange. He might try to talk to her about it, but if Hermione is being stubborn, he could get frustrated. He could also be a bit oblivious and just think Hermione is being overprotective as a friend.
One idea could be that Harry and Daphne are paired up for a special project at Hogwarts. As they work together, they start to see each other in a new light. Daphne might initially be a bit cold towards Harry, but as she gets to know him better, she warms up. Their relationship could develop slowly as they face challenges within the school, like dealing with a new dark magic threat.
A really interesting plot could be that Harry and Daphne find a hidden chamber in Hogwarts that is related to an ancient magic that neither the Gryffindors nor the Slytherins knew about. They have to work together to keep it safe from dark wizards who are also searching for it.
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 possible plot is that they discover some magical property related to the baby during the pregnancy. For example, the baby might have a special connection to an ancient magic that no one has seen before. This could lead them on an adventure to find out more about it and also protect the unborn child from those who might want to use this power for evil. Also, they could struggle with how to balance their normal wizarding lives, like Harry's Auror training or Daphne's family obligations, with the upcoming parenthood.
One interesting plot could be Daphne discovering a hidden secret passage in the Chamber of Secrets that even Harry doesn't know about. She could then team up with Harry to explore it further.