Often in these fanfictions, a change in the overall plot of the wizarding world can impact their relationship. Say, if Voldemort never existed in the alternate universe. They might be academic rivals instead of the more hostile enemies from the original story. They could end up respecting each other's magical abilities and form a bond over that. Another way is if they are both part of a prophecy in the alternate universe that forces them to work together, which can lead to a whole new dynamic in their relationship.
One great 'Harry Draco alternate universe fanfiction' is 'All Our Secrets Laid Bare'. It explores a world where they are on opposite sides of a political struggle in Hogwarts. Another is 'Away Childish Things' which gives a really different take on their relationship, with them being forced to work together in a Muggle - wizard cooperation project.
It often changes for the better. After Harry apologizes, Draco might be initially skeptical. But as they start to interact more, they could become friends or at least develop a mutual respect. For instance, they might start sharing their experiences during the war, which helps them understand each other better.
Harry might become more cautious. With Draco as his brother, he'd be exposed to Slytherin - like thinking more often. He could start to weigh his actions more carefully and think about the long - term consequences. Draco, on the other hand, might become a bit more empathetic. Growing up with Harry, he'd see the Gryffindor values up close and might start to care more about others.
In an alternate universe, their relationship could develop in a very different way. For example, if the wizarding world had no concept of pure - blood supremacy, Draco would not have the same prejudices he had in the original story. He might meet Tonks in a more positive setting, like at a magical research facility where they are both working on a project to improve inter - magical creature relations. Their relationship could start as a friendly professional one, and over time, they could develop deeper feelings as they discover each other's strengths and vulnerabilities.
One way they could be brothers in a fanfiction is if there was a mix - up at the orphanage or some sort of magical interference in their early lives. Maybe a powerful spell was cast that made them related, and as they grew up, they had to deal with the strange connection while still having their different personalities and allegiances at Hogwarts. Draco, with his pure - blood family values, and Harry, with his own sense of justice, would have a very complex relationship.
At first, it would become more strained. Harry would likely be angry and hurt by Draco's actions that made him cry, so he might avoid Draco even more than before. He might also be more on guard around Draco, not trusting him at all.
Their relationship would likely become more collaborative. They would have to communicate regularly about Teddy's needs, like his schoolwork, his magical training, and his emotional well - being. This would force them to put aside their past grudges and start seeing each other in a new light.
Perhaps he meets a version of his parents who are still alive. This would be an incredibly emotional encounter for Harry. He would get to know them, and they could teach him things about magic and life that he never had the chance to learn before.
Well, in these fanfictions, they go from being rivals to soulmates. Instead of the constant bickering and animosity, there's a newfound understanding. They start to see the good in each other that was hidden before.
He might meet different versions of his friends. For example, a Hermione who is a powerful sorceress ruling a magical kingdom. It would be exciting as he could learn new magic from her and be part of her adventures in this alternate reality.