The plot might start with Draco having some strange dreams about a connection to Harry. He initially dismisses it as just a dream, but as time goes on, he can't ignore it. Meanwhile, Harry is also having some unexplained feelings towards Draco. Eventually, they come across an old wizard who knew their parents well. The wizard reveals that they are brothers. This revelation shakes the wizarding world as they are from two very different 'sides'. They then have to work together to bring about a new era of peace in the wizarding community, uniting the Gryffindors and Slytherins in a way that has never been done before.
One possible plot could be that Harry has always felt a strange connection to Draco. As the story unfolds, they start to notice similarities in their magic that are not common. After some investigation, they find out they are brothers. This then leads to a whole new dynamic where they have to protect each other from the dark forces in the wizarding world. They might also have to face the reactions of their respective families, like Harry's friends at Hogwarts and Draco's family in Slytherin.
Obviously, Harry and Draco are the main characters. Since the story is about them being brothers, they are the focus. But other characters like Hermione and Ron from Harry's side, and Lucius and Narcissa from Draco's side could also play important roles in how they react to this new relationship.
Maybe the twin brother has a special power that Draco doesn't. For example, he could be a seer like Trelawney but more accurate. His visions could show him the future of Hogwarts and the wizarding world during the dark times of Voldemort's return. He then tries to use this power to prevent bad things from happening, but Draco is suspicious of his actions and tries to stop him, thinking he's going against their family and the Dark Lord.
One possible plot could be that Harry would grow up in a very different environment. He might be influenced by the Malfoy family's pure - blood supremacist views at first. But then, as he discovers his own values, he could face a huge internal conflict. He may also have a different relationship with the other Hogwarts students. For example, he might not be as close to Ron and Hermione as in the original story because of his family ties to Draco.
In the 'Harry and Draco in Prison' fanfiction, it could be that the wizarding world has a new, strict regime. Harry, being the symbol of the resistance against dark forces, is imprisoned to silence him. Draco, who has always been on the fence between good and bad, is also thrown in prison for not fully conforming. Inside, they initially clash due to their long - standing rivalry. However, as time passes, they realize that the real enemy is the unjust system that put them there. They combine their skills, Harry's courage and Draco's cunning, to start a prison - wide revolt and try to bring about change in the wizarding world.
The plot might involve the brother's transformation into a Phoenix - like form in the fanfiction. This could be a result of some magical event or a hidden heritage. As a Phoenix, he would have to deal with the new responsibilities and powers. He could face challenges from other supernatural beings who either fear or envy his new form, all while trying to keep his sister safe and uphold the values of the Lost Girl world.
Well, it could be that Draco is initially shocked and maybe a bit remorseful when he sees Harry's scars. He might start to see Harry in a new light, realizing the hardships Harry has faced. This could lead to a change in their relationship, perhaps from enemies to something more complex like reluctant allies or even friends.
Well, one possible plot could be that in a world where magic allows for such things, Harry and Draco might have had a secret relationship. Maybe they were forced to work together on a dangerous magical task and during that time, their feelings changed. And this led to Harry becoming pregnant, and then they would have to face the reactions of their friends and the wizarding community which could range from shock to outright hostility.
Well, it could be that Draco steals Harry's glasses as a prank. Maybe he wants to embarrass Harry in front of their classmates. He might hide the glasses in a secret place in Hogwarts, like in an old unused classroom, and Harry has to search for them while dealing with his blurry vision.
One possible plot could be that Draco has a change of heart towards Harry. Maybe he sneaks into Harry's bed to apologize for past wrongs in a very private and intimate way. He might want to start a new chapter in their relationship, moving from enemies to friends or something more.
The plot might involve a magical accident or a prophecy that binds Harry as Draco's dominant mate. Harry then has to help Draco through some difficult challenges. Maybe Draco is in danger from some dark forces, and Harry, being his dominant mate, uses his Gryffindor courage and powerful magic to keep Draco safe. They gradually learn to trust each other more than they ever have before, and this new bond changes their relationship dynamics completely.