A possible plotline could be that it's part of a time - travel story. Harry or Draco (or both) are sent back in time, and they realize that in order to change the future for the better, they need to break the barriers between them. The kiss in the Great Hall is a symbolic act of unity and love that starts to shift the balance of magic in the wizarding world. It could also be a situation where they are under the influence of a love potion, but as they come out of the potion's effect, they find that there are real feelings there that they were suppressing before. This could lead to a complex relationship journey filled with self - discovery and acceptance within the fanfiction.
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.
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.
Yes, there are likely some fanfictions with such a plot. You can try searching on popular fanfiction websites like Archive of Our Own (AO3). Just type in the relevant keywords, and you should be able to find some works that feature Harry and Draco kissing in the Great Hall. However, the availability may vary depending on the popularity of the concept within the fanfiction community.
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.
In fanfiction, their kiss might be a way to break free from the expectations placed on them. Harry is always seen as the hero and Draco as the villain's sidekick. By kissing, they are defying those roles and expectations. It could also be a way to gain power over each other in a different sense. Instead of the usual power struggle based on magic or family name, the kiss becomes a new form of power dynamic between them.
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.
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 Harry has some sort of misunderstanding. Maybe he believes Draco is involved in a dark plot that endangers Hogwarts. So, in a rash moment, he kidnaps Draco to interrogate him. But as he does this, he realizes that Draco might be innocent and then has to deal with the consequences of his actions.
Well, it could be for the sake of exploring an alternate reality. The Great Hall is a place full of magic and tradition in the 'Harry Potter' world. The writer might want to create a scenario where the usual boundaries between Harry and Snape are broken. It could also be a way to show a more complex side of their personalities. Maybe Snape has a side that is attracted to Harry's courage and Harry sees a different, more vulnerable side of Snape, leading to this kiss.
In some fanfictions, it could be a case of a powerful curse that forces Harry to act against his will. The curse might be placed on him by a powerful dark wizard who wants to create chaos in the wizarding world. Draco is just an unfortunate victim of this curse as Harry, unable to control himself, kills Draco. This then sets off a chain of events where Harry has to deal with the guilt and the consequences of his actions.
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.