One idea could be that they face opposition from some in the wizarding world who still hold onto the traditional views of pure - blood and half - blood relationships. They then have to fight to prove that their love is stronger than these archaic beliefs. Another plot could involve them having to deal with a new dark threat while also planning their wedding, adding a lot of tension and drama to the story.
One idea could be that they are forced into an arranged marriage for some magical political reason. At first, they dislike each other but as they start to understand the other's past and insecurities, they gradually fall in love. For example, Hermione could learn about Draco's fear of not living up to his family's expectations and Draco could see Hermione's struggles in the wizarding world as a Muggle - born.
One idea could be them having to deal with the reactions of their friends and family. For example, Harry's friends from Gryffindor might be initially shocked but then come to accept it as they see how happy Draco and Harry are together. Another plot could involve them facing some sort of magical mystery or threat that only their combined skills can solve, which also strengthens their bond as a married couple.
One plot idea could be that they face opposition from the wizarding community due to their past enmity. But they work together to overcome it. For example, they might hold a press conference in Diagon Alley to explain their relationship. Another idea is that Severus, being pregnant, discovers a new potion related to the health of the baby and the magical bond between him and Harry. And they could also go on a journey to find a magical artifact that will protect their unborn child from dark forces.
One plot idea could be a time - travel fanfiction where they get married in an alternate timeline. Maybe Harry accidentally activates a time - turning device and ends up in a world where he, Ginny and Hermione all decide to have a triple wedding for some magical reason. Another could be a post - war fanfiction where they get married as a symbol of new beginnings and unity among the wizarding community. For example, their weddings could be grand events that bring together all the different houses and factions that were once divided during the war.
One idea could be a story that focuses on their wedding planning. Hermione wants a small, intimate ceremony, but Ron's large family has different ideas. It could be filled with humorous moments like Ron trying to keep the peace between Hermione and his mother. Another plot could be set after their marriage, where they go on a magical honeymoon and discover a new, hidden magical place. They could have adventures there and learn more about each other in the process.
They could start a magical school of their own. As a married couple, they would pool their resources and knowledge. Hermione's love for learning and Harry's practical experience would make for a great curriculum. They would face opposition from the traditional wizarding schools at first, but eventually prove that their new way of teaching magic is beneficial for young wizards and witches.
In this kind of fanfiction, a possible plot is that Hermione gets involved in a magical mishap that damages Snape's classroom. As a punishment, Snape forces her to stay after class every day for a month to help him organize his potion ingredients. Another situation could be that Hermione challenges Snape's teaching methods in front of the class. Snape then gives her the task of teaching a potions class herself under his strict supervision as a form of punishment. Also, if Hermione is caught using a spell without permission in Snape's class, he might punish her by making her copy out a long list of complex potion - making rules a hundred times.
One interesting plot idea could be a story that focuses on their wedding preparations. It could show how Naruto, who is not used to all the formalities, struggles with choosing the right wedding kimono or learning the proper wedding etiquette. Hinata, on the other hand, is more in tune with the traditional aspects but is nervous about becoming the wife of the Hokage. Another idea could be a time - travel fanfic where they go back in time to their first meetings and relive those moments with the knowledge of their future together. It would be a chance for them to see how far they've come and how their relationship has developed over the years.
One interesting plot idea could be the wedding planning itself. Edward might be clueless about most of the traditional wedding stuff, like choosing the right flowers or the color scheme, and Winry has to patiently guide him. Another idea could be a pre - wedding adventure where they have to overcome some final alchemical or mechanical challenges together, which strengthens their bond even more before the big day. Maybe there could also be a sub - plot about their friends' reactions to the wedding, with some humorous moments like Alphonse being overly excited and trying to help in his own unique way.
A possible plot is that Amy discovers she is pregnant again right before the wedding. This causes a lot of chaos and self - doubt. Ricky, on the other hand, is very supportive and it makes their bond even stronger. Or perhaps they decide to have a destination wedding and during the journey to the destination, they face various challenges that test their relationship.