One interesting aspect is the exploration of forbidden or unlikely love. In the Harry Potter universe, there are clear lines between good and evil, and Harry and Nagini are on opposite sides in the original story. Fanfiction about their love can delve into how love can cross those boundaries, and how the characters might grow and change as a result. It also gives room for creative interpretations of the characters' personalities beyond what we know from the books, like maybe Nagini has a more complex and sympathetic side that could attract Harry.
Yes, there are some out there. You can try searching on fanfiction - specific websites like Archive of Our Own. Just be aware that the concept is quite unusual as Nagini is a snake and in the original series, not really a typical love interest for Harry.
Another plot could be set in an alternate universe where Nagini has a different origin. Maybe she was an ordinary snake that was experimented on by dark wizards, and Harry stumbles upon her during his travels. He then decides to help her break free from the dark magic that binds her, and in the process, they form an unlikely bond. This bond could then be tested as they face various threats from both the wizarding world and those who want to use Nagini for their own evil purposes.
A really cool plot in some fanfictions is when Nagini has a secret power that even Voldemort doesn't know about. This power could be something that has the potential to change the outcome of the wizarding war. Maybe it's a power that can only be unlocked by a certain person, like Harry, and this creates a whole new set of adventures and challenges.
One interesting 'Harry Potter Nagini' fanfiction could be about Nagini's backstory before she was Voldemort's snake. It might explore how she came to be an Animagus in the first place. Another could be a story where Nagini has a change of heart and decides to help the Order of the Phoenix against Voldemort. There are also fanfictions that focus on the relationship between Nagini and other characters like Snape, imagining how they might interact in different scenarios.
Perhaps in this fanfiction, Nagini has a hidden past that is related to Harry's family. For example, she could have been an experiment of some dark wizard long ago that was somehow connected to Harry's ancestors, and this discovery leads to a complex relationship between Harry and Nagini as they try to uncover the truth.
The contrast in their characters makes it interesting. Harry is known for his bravery and self - sacrifice, while Astoria has her own charm and grace. Seeing how these two different personalities interact and fall in love can be captivating.
It could start with hostility. Harry sees Nagini as a tool of Voldemort, and Nagini is loyal to Voldemort at first. But then, some unexpected events might force them to interact more. For example, they could be trapped together in a magical place, and they have to rely on each other to get out.
One common theme is Nagini's humanity. Many fanfictions try to give her more depth and show that she has feelings and thoughts beyond being just a tool for Voldemort.
It could have Nagini in a more human - like form at times, having conversations with other characters. The lemon aspect might be in the form of a romantic or sensual undertone between Nagini and another character, like a Death Eater. For example, they might share some intense glances during a meeting at Voldemort's lair.
One common theme could be the exploration of the relationship between Harry and Nagini in a more romantic or sensual context, which is quite different from the original story. Another might be the power dynamics, as Nagini is a powerful and somewhat mysterious creature in the Potterverse.