Well, it could completely shift the relationships in the story. Instead of Hermione being in a difficult situation with Ron, she now has an unexpected ally in Draco. This might lead to a new friendship or even a different kind of relationship between them. It could also make Ron realize his mistakes if he was indeed being abusive in the fanfiction.
In the context of the fanfiction, this event could be a turning point. It could open up new plotlines such as Draco and Hermione teaming up to deal with whatever made Ron act abusively. Maybe they discover some dark secret or influence that was affecting Ron. This could also have implications for the other characters in the story. For example, Harry might be caught in the middle, having to choose between his loyalty to Ron and his respect for Hermione and Draco's newfound bond.
If Draco steals Hermione from Ron in fanfiction, it might show a different side of Hermione. She might be attracted to Draco's intelligence in a different way than Ron's loyalty. This could lead to new magical adventures where Hermione uses her knowledge in a more Slytherin - like way, influenced by Draco. It could also make for some interesting interactions between the Gryffindors and Slytherins, as now there's a connection between them through Hermione. The story could explore how love can cross house boundaries in a more extreme way than what we see in the original books.
One possible motivation could be that Draco has changed. He might have seen the error of his ways and decided to do the right thing. Another motivation could be that he has feelings for Hermione, even if they are not fully realized yet. He doesn't want to see her in a bad situation, so he steps in.
Over time, if the fanfiction progresses, Hermione could become a sort of bridge between Ron and Draco. She might encourage them to get along, now that Draco has shown that he can be on Hermione's side. Draco might also start to see Ron in a different way, realizing that Ron's jealousy or rudeness towards Hermione was born out of his own insecurities. This could potentially lead to a more complex and interesting dynamic between the three of them.
Draco might be motivated by jealousy. He could be jealous of Ron and Hermione's friendship or a possible romantic relationship between them. So he tries to harm Hermione out of spite.
Well, in some versions, Ron might use his quick wit and knowledge of Hogwarts' secret passages to outmaneuver Draco. He could lead Hermione to safety through a passage that Draco doesn't know about.
Well, it definitely makes things more complicated. Ron would probably be very confused and angry at first. He might see Draco's actions as a form of interference or even an insult. He may think Draco has some ulterior motives towards Hermione.
They often change the original storyline by altering the character traits. Maybe Draco is not as much of a bully as in the original, and this new side of him attracts Hermione, leading to the cheats scenario with Ron. This change can make readers see the characters in a new light and also explore different possible endings to the relationships that were not possible in the original story.
It changes the whole dynamic. Since Cedric doesn't die, it means that the events following his supposed death in the original plot would be different. For instance, Harry might not be as deeply affected by Cedric's death, which was a major turning point in his character development.
If Hermione and Draco were siblings in fanfiction, it would completely turn the original story on its head. For one, Hermione's Gryffindor nature and Draco's Slytherin one would create a really interesting family dynamic. Their parents must have had a very complex relationship for this to be possible. It could lead to Hermione having a different view of the wizarding world from the start. Instead of being a Muggle - born advocate in the way she was, she might have had some internal conflict due to her Slytherin - influenced family ties. And Draco might not be as much of a bully as he was originally, or at least he would have a different kind of relationship with Harry, Ron, and Hermione.
If Lucius wants Draco to marry Hermione, it could lead to a lot of political implications within the wizarding world. The Malfoys are a powerful pure - blood family, and Hermione's friendship with Harry Potter and association with Dumbledore's side could be seen as a way for Lucius to gain some sort of advantage. For Draco, this could be a way out of the dark path he was on in the original story. He could become more of an ally to Hermione and her friends. And Hermione might find herself in a very strange position of having to balance her own values with the expectations of the Malfoy family.