In one scenario, Ginny is cursed during a Quidditch match. The curse makes her forget her love for Harry. Harry tries everything to break the curse but fails. Heartbroken, he divorces her. The OC is an expert in curse - breaking who Harry meets while seeking a solution. She helps him through the tough time and they end up together.
Well, in fanfic scenarios, the divorce of Harry and Ginny could be a plot device to introduce drama. It might start with a misunderstanding between them. For example, Ginny could be wrongly accused of something and Harry, in his haste, doesn't believe her. As for the Harry - OC part, the OC could be a healer who treats Harry after a difficult battle and they gradually form a bond.
One possible plotline could be Ginny leaving Harry due to the pressure of his fame. She might feel overshadowed and decides to pursue her own life away from the spotlight. Another could be a misunderstanding. Maybe she misinterprets Harry's actions or words and in a fit of anger, leaves him. Or perhaps an external threat forces her to leave to protect Harry, like a dark wizard threatening her to stay away from him so as not to be used against Harry.
One possible reason could be the stress of Harry's fame. His status as 'The Boy Who Lived' might put a lot of pressure on their relationship. Constant media attention and public expectations could lead to arguments and a growing distance between them.
One possible plotline could be Harry initially resisting the marriage due to feeling forced into it, but as he spends more time with Ginny, he discovers new sides of her and gradually falls in love. For example, they might have to work together to face some new dark magic threat in the wizarding world, and through that shared experience, their relationship deepens.
One possible plotline could be that Harry initially acts very out of character under the influence of the love potion. He might become overly affectionate towards Ginny, which could cause confusion among their friends. Another could be that Ginny realizes the mistake she made in giving him the potion and tries to reverse its effects. Maybe she has to seek help from Hermione, who is well - read in potions and magic, to find an antidote.
Maybe in fanfiction, Ginny discovers that Harry still has some unresolved feelings for Hermione. This could create a rift between them and lead to a divorce. It's not uncommon in fan - created stories to explore complex love triangles that were not fully resolved in the original series.
One possible plotline is that Harry and Ginny plan a surprise for the Weasley family. They could use their magic to create a spectacular light show outside the Burrow. Another is that Ginny's old school friends come to visit during Christmas, and there's a bit of friendly rivalry between them and Harry over Ginny's attention. But in the end, it all ends with a big Christmas party where everyone has a great time.
One possible plotline could be that they disappear to escape a new dark threat that has emerged in the wizarding world. They might be seeking a powerful magical artifact to defeat this threat and have to go into hiding to find it.
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.
Another plotline might be their family life. They could be shown starting a family early, and dealing with the joys and challenges of raising children in the wizarding world. For example, teaching their kids magic at home, or dealing with the chaos of a family full of young wizards.