It could be about a time - travel plot. Maybe Harry goes back in time and realizes that in order to prevent a greater evil in the future, he has to work with Voldemort in the past.
Perhaps it's a story where the magical world is under attack from an even more powerful and dangerous force from outside, like an alien - like magic that neither Harry nor Voldemort can face alone, so they have to join forces.
There probably is. Fanfic communities are full of unique and unexpected plot ideas. This kind of plot would completely turn the original story on its head. It might involve some sort of alternate reality where Harry and Voldemort have a common goal or where they are forced to work together due to some external threat. It could be a really interesting read for those who like exploring different interpretations of the Harry Potter universe.
Well, the plot might involve them facing a threat that only their combined skills can defeat. Harry Potter is good at spells and dealing with magical creatures, and The Doctor is a time - traveling genius. So they could be fighting an enemy that has the ability to manipulate time in the wizarding world, something that neither of them can handle alone. Harry could use his invisibility cloak to sneak around while The Doctor figures out the science behind the time - manipulation.
In such a fanfic, one possibility could be that the Armistice is brokered by an unexpected third party. Maybe a powerful magical creature that both Harry Potter and Voldemort respect. This creature could convince Voldemort that the continuous war is only weakening the wizarding world as a whole and that there could be a better way to achieve his goals without all the bloodshed. Harry, on the other hand, would be skeptical but might see it as an opportunity to finally end the war and start rebuilding the wizarding community.
Perhaps in this fanfic, there has been some major plot twist that makes Harry believe that bowing to Voldemort is the only way to save his friends or the wizarding world. For example, Voldemort may have threatened to kill all of Harry's loved ones if he doesn't submit, and Harry is sacrificing his pride for the greater good.
Perhaps in a world where the prophecy was misinterpreted. The original prophecy that linked Harry and Voldemort could have been misread. In this fanfiction, they discover that they were never truly enemies in the way they thought. Instead, they were meant to work together to bring balance to the wizarding world. Harry, with his compassion, would be more open to this idea, and Voldemort, seeing an opportunity for a different kind of power, would join forces with him.
One possible plotline could be that Voldemort realizes that Harry is the key to some greater power or knowledge that he wants to obtain. So, instead of killing Harry, he saves him from another dark wizard or a dangerous magical creature. Maybe he sees that Harry has a connection to an ancient magic that could help him rule the wizarding world in a more complete way.
One possible plotline could be that Harry discovers some sort of ancient magic or prophecy that binds him to Voldemort in a way that is not initially understood as a mate - like relationship. As they interact more, they start to see different sides of each other. Harry might try to change Voldemort, and Voldemort might find himself having unexpected feelings for Harry. Another plotline could involve a magical accident that fuses their magic in a way that creates this bond. Then they have to navigate their new relationship while dealing with the wizarding world's reactions.
Well, one possible plot could be that Harry is somehow transformed into the snake against his will. He then has to figure out how to break the spell while being in the form of the snake and also being close to Voldemort. He might use his knowledge of Voldemort's secrets to his advantage even in that form.
It could be a rogue Death Eater who wants to take over Voldemort's position and sees Harry and Bellatrix's new - found alliance as a threat. For example, a Death Eater who was always jealous of Bellatrix's closeness to Voldemort.
It's very possible. Fanfic is a place where people can play with the established characters and concepts in new ways. Maybe in this fanfic, Harry has some hidden power that makes him linked to Voldemort's snake. Or perhaps there's a time - travel or parallel - universe scenario where he becomes associated with the snake in a way that challenges our understanding of the original Harry Potter story.