In some 'Harry married Lily' fanfictions, the plot might revolve around a prophecy that was misinterpreted. Instead of Harry being related to Voldemort in the way it was originally thought, the prophecy could be related to his connection with Lily in a romantic way. This could lead to a whole new set of events where they get to know each other on a deeper level, overcome various obstacles in the wizarding society that would oppose such a relationship, and eventually get married. There could also be elements of family drama, like how James Potter would react in such a scenario, or how Harry's friends would view this relationship.
Well, a plotline might involve them facing challenges from the wizarding world. For example, there could be threats from dark wizards which they have to fight together as a married couple. Or perhaps they get involved in some sort of magical research as a team in their married life. Also, their relationship growth is a big part. They could have little arguments and then make up in the most romantic ways, like James bringing Lily her favorite flowers after a fight.
Well, one plotline could be that Lily uses her influence to change the way Hogwarts is run. Since she was a brilliant witch, she might introduce new spells and teaching methods. For example, she could start a special class for students to learn advanced defensive magic earlier.
One plotline could be that they secretly married to protect Ginny from a dark wizard who has a vendetta against Harry. By being secretly married, they think they can keep Ginny out of harm's way. Another could be that they did it on a whim during a romantic getaway and then decide to keep it a secret just for a while to enjoy their private time together.
One possible plotline could be that they keep their marriage a secret to avoid the chaos it would cause in the wizarding world. They might have some sort of deep understanding that developed over time, which led to their union. Another could be that they got married for some sort of strategic reason, like protecting each other from certain threats.
One plotline could be that Harry discovers a prophecy that ties his future to Severus in a way that leads to them getting secretly married. They then have to navigate through the political intrigue of the wizarding world, with some characters suspecting their relationship and others being completely oblivious. Their relationship grows as they fight against those who would try to break them apart.
A possible plotline is that Bellatrix is actually an undercover agent for the Order of the Phoenix all along, and her relationship with Harry is part of her cover. They get married as part of a larger plan to infiltrate the Death Eaters more deeply. As they live together, they start to truly care for each other. Another plotline could be that a powerful magical artifact forces them to marry. They initially hate each other but as they are forced to co - exist, they discover hidden sides of each other. Harry might see the broken and conflicted person inside Bellatrix, and Bellatrix might see the true hero in Harry. This could lead to a very complex and emotional story of love and redemption.
One possible plotline could be them fighting supernatural threats together. Since both Harry and Dean are used to dealing with the supernatural in their respective universes, they could combine their skills and knowledge. For example, Harry's magic could be a new weapon against the demons Dean usually hunts.
Perhaps in a fanfiction, Clementine and Lily meet in a school setting that's not like a normal school. It could be a school for training people with special abilities. Clementine is new and Lily is one of the more experienced students. At first, Lily is a bit of a bully to Clementine because she's new and seems to be getting a lot of attention. But then they are paired up for a project and through that, they discover that they have a lot in common. They end up becoming friends and standing up for each other against the real bullies in the school.
One possible plotline could be that Lily, now as a girl, has to navigate the wizarding world all over again. She might face different challenges and opportunities than she did before. For example, she could form new friendships or rivalries at Hogwarts.
One possible plotline could be that Lily and James return during the time of Harry's battle with Voldemort. Their return could give Harry new strength and hope. They might use their old magical knowledge and skills to help in the fight. Maybe they could also reunite with their old friends like Sirius and Remus, and together they form a powerful force against the Dark Lord.