Well, perhaps Draco has some new-found knowledge or a secret weapon that gives him confidence to take on Harry for the Lord Black title. Harry, on the other hand, may be initially reluctant to engage in the duel but is pushed into it to protect the legacy of the Black family. During the duel, they both could discover things about the Black family history that changes their perspective on the whole matter.
In this fanfiction scenario, the duel between Draco and Harry for the Lord Black title could be a very complex affair. Draco might be influenced by his family's past association with the Black family and his own desire to prove himself better than Harry. Harry, being the hero type, would be more concerned about the well - being of the wizarding world and the implications of Draco becoming Lord Black. There could be magical artifacts involved that are tied to the Black family that both try to use during the duel. The duel could also attract the attention of other characters like Hermione and Ron, who might try to interfere or help Harry in some way.
In this fanfiction, Draco would flaunt his family's signature spells. His magic would be more calculated and strategic, like setting up magical traps before the duel even starts. Harry's magical abilities would be more about his connection to his friends and the positive energy that gives him. He could use magic that is enhanced by his loyalty and friendship, like a spell that gets stronger the more he thinks about protecting those he cares about. During the duel, both of them would have to constantly adapt their magical abilities to counter each other's moves.
A plot could involve Harry dealing with the Black family's old grudges and feuds. As Lord Black, he has to sort out the mess left behind by generations of Blacks. He might have to mediate between different branches of the family who have been at odds for centuries. Harry could use his own experiences of friendship and loyalty from his time at Hogwarts to try and heal the rifts within the Black family. This would not only change the Black family but also have a positive impact on the overall wizarding society as the Black family has a significant influence.
One possible plotline could be that Harry discovers he has a hidden connection to the Black family that makes him Lord Black. This could lead to him having new powers or responsibilities within the wizarding world, and he might have to deal with the complex politics and family secrets of the Blacks.
One possible plotline could be that Harry, through some magical accident or inheritance, comes to own Draco's family manor. Draco is then forced to interact with Harry on Harry's terms to regain his family's pride. Another could be that Harry wins a bet against Draco and the terms of the bet are such that Harry now has ownership over Draco's time, making Draco do tasks for Harry.
One possible plotline could be that Harry betrays Draco in a duel. Maybe there was some sort of misunderstanding or a secret deal that Harry made with someone else that required him to turn on Draco during the duel. For example, if there was a dark wizard threatening Harry's friends and the only way to save them was to sacrifice Draco in the duel by using a forbidden spell against him.
One plotline could be that Harry is influenced by the Dark Lord's ideology from an early age. Maybe he discovers some 'truths' as he sees them that make him believe the Dark Lord's way is the right one. For example, he might think that the wizarding world's current order is corrupt and only the Dark Lord can fix it.
Perhaps Harry is reincarnated as Lord Emrys in an alternate timeline. He then has to use his new - found identity and powers to reshape the wizarding world for the better. He might face challenges from those who oppose his new - found status and powers, while also trying to uncover the secrets of his past life as Lord Emrys.
One possible plotline could be that they discover they are brothers early on in their Hogwarts years. This would cause a huge stir among the students and teachers. They might initially struggle to accept it, especially given their past animosity. But as they get to know each other better, they start to form a bond and protect each other from the various threats in the wizarding world.
One possible plotline could be that it's a moment of unexpected playfulness between Draco and Harry. Maybe they are in a truce situation, and Draco, in a moment of light - heartedness, decides to tickle Harry as a form of friendly teasing. It could be a way to show a new side of their relationship, moving away from their usual rivalry.
Well, it could start with long - hidden feelings. Maybe Draco has secretly been attracted to Harry all along, and in a moment of courage in the Great Hall, he makes a move. This could lead to a series of events where they have to face the prejudice of their respective houses. The Gryffindors might be shocked that Harry is involved with Draco, and the Slytherins might think Draco is betraying them. Or perhaps it's a dream sequence that Harry has, and it makes him question his feelings towards Draco, leading to a slow - burn exploration of their relationship in the rest of the fanfiction.