Another possible reason is that they simply fall in love so quickly and passionately that they don't want to wait or deal with the formalities and public scrutiny. They choose to have a secret marriage as a way to seal their love immediately and privately, away from the prying eyes of the wizarding community which is always so interested in their family affairs.
Well, one reason could be to avoid the backlash from their respective families. The Malfoys and the Weasleys have a long - standing feud, so a secret marriage would be a way to be together without the immediate family drama.
They might be afraid of how their families will react. The Weasleys have their own ideas about who Fred should be with, and Hermione's parents, while muggles, might not understand a hasty and secret marriage. Also, there could be threats from dark forces. If the wrong people find out about their union, it could put them in danger, so secrecy is key.
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.
Maybe they meet in a secret place during their school years, away from the prying eyes of their classmates. They start to exchange ideas and knowledge, which gradually turns into a deep emotional connection. This connection then leads to a secret marriage, and they have to deal with the consequences of hiding it from everyone they know.
One interesting fanfiction could be 'Secretly Bound'. In this story, it explores how Draco and Ginny's secret marriage unfolds against the backdrop of the wizarding world's politics. The author beautifully weaves in the characters' growth and how they deal with the secrecy.
One reason could be family opposition. For example, if the families are from different social classes or have some long - standing feud. Another reason might be cultural or religious differences that the families would not accept.
One possible reason could be a curse that was placed on her secretly. Maybe an enemy from her past, someone she thought was defeated, managed to put a slow - acting curse on her. Another reason might be a side - effect of some powerful magic she used to save someone or solve a difficult problem. For example, if she used time - traveling magic in a wrong way, it could have negative consequences on her health.
There are several possible reasons. Draco might be trying to assert his superiority. Since Ginny is from a 'blood - traitor' family in his view, he could be making fun of her to show that he thinks he's better. Also, he could be doing it to get a reaction from Harry. By taunting Ginny, he knows it will likely anger Harry, which might be part of his plan in the fanfiction.
One possible plotline could be that they discover they have more in common than they thought. Maybe they start working together on a project in the wizarding world, like researching a long - forgotten magic. As they spend time together, they realize their feelings for each other have changed from hatred to love. To avoid the chaos that would ensue from their families and friends' reactions, they decide to marry secretly. Another idea is that they are forced into a situation where they have to pretend to be married for some magical reason, like protecting a powerful spell or object. During this time, they start to really fall for each other and end up making it a real, secret marriage.
One possible reason could be that Draco is scared of the responsibility. He might come from a family with certain expectations and the idea of having a child with Ginny, who is from a different side in the wizarding world, could be too much for him to handle.
Fear of family opposition. Maybe one's family doesn't approve of the partner due to various reasons like different social status or religion.