One consequence could be a change in the public's perception of Hermione. Some might see her as a hero for standing up against an unjust imprisonment, while others might view her actions as traitorous, especially if they believe Draco was truly guilty. This could create a divide among the wizarding community.
One possible fanfiction could involve Harry finding out that Draco was wrongly imprisoned in Azkaban. Harry might use his influence and his skills as an Auror to dig deeper into Draco's case. He could discover evidence that clears Draco's name, like finding out that Draco was framed by some dark wizards who wanted to get rid of the Malfoy family's influence. Then, Harry would have to fight against the bureaucratic system of the Ministry of Magic to get Draco released.
For Harry, his friends in Gryffindor could be a bit confused at first. They know Draco is not exactly a friendly character. But overall, it could lead to a more united front against real threats in Hogwarts. The teachers might also take notice. Dumbledore, for instance, would probably be proud of Harry for showing such selfless courage, regardless of who he was saving.
The wizarding world would be in shock. The Malfoys are known for their dislike of the Potters, so Draco saving Harry would go against the family's reputation. It could lead to Draco being ostracized by some in the pure - blood community.
One consequence could be that it creates a rift between Ron and Hermione. Hermione might be grateful to Lucius, which could make Ron jealous or angry. This could lead to a strain in their relationship, and they might have to work through their feelings about Lucius' interference.
One consequence could be that he gains an unexpected ally in Draco. Draco might feel indebted to Harry and start to change his views towards him, which could lead to some interesting interactions between them in the future. This could also cause some tension among their respective groups of friends.
In this kind of fanfiction, it could happen in various ways. Maybe Hermione discovers some evidence that Draco was wrongly accused. For example, she might find that certain spells were cast on Draco to make him seem guilty when he actually wasn't. So she uses her intelligence and knowledge of magic to expose the truth and save him from Azkaban.
She might face some magical backlash. Saving someone from the veil could be against the natural laws of magic in the fanfiction world, so she could experience some physical or mental exhaustion as a result.
He might face opposition from his own pure - blood community. Since Hermione is a Muggle - born, saving her could be seen as going against their traditional values. So he could be ostracized or face threats from some of the more extreme pure - blood families.
One consequence could be that Bellatrix becomes enraged and sets out to hunt Fred down. This would put Fred in constant danger as Bellatrix is a very powerful and vengeful witch.
Maybe Draco discovers that Severus is being framed for a crime he didn't commit. He then approaches Hermione for help as she is known for her intelligence and problem - solving skills. Together, they start to gather evidence to clear Severus's name and also protect him from those who want to harm him.