In a more creative fanfiction, Harry's squint at Nagini could be part of a vision or a prophecy - related event. He squints as if seeing through Nagini to a future or past event that holds the key to defeating Voldemort. This could involve time - travel elements or revelations about the origin of Nagini's power.
There might be a fanfiction where Harry's squint at Nagini occurs during a tense moment in a battle. He's squinting because he's trying to anticipate Nagini's next move, as she's a dangerous weapon in Voldemort's arsenal. This could lead to a series of events where Harry uses his knowledge of Nagini to gain an advantage in the fight against the Dark Lord.
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.
A great fanfiction idea could be that the squinting Death Eater has a special power related to his squinting. For example, he can see hidden magical auras that others can't. This power could put him in a unique position within the Death Eater ranks. He might use this power to either further the Death Eaters' goals or, if he has a moral awakening, to undermine them.
There might be a fanfiction where Harry Potter is at a Quidditch match without his glasses. He's squinting to try and spot the Snitch. This could lead to some interesting situations, like misidentifying other flying objects as the Snitch at first, and his team having to cover for him while he struggles without his proper vision.
I'm not sure of a specific one titled exactly like that. But you could check out popular Harry Potter fanfiction websites like Fanfiction.net or Archive of Our Own. Search for tags like 'Harry Potter', 'Nagini', and'moment of realization' which might lead you to a story where Harry squints at Nagini in a significant moment.
There's also 'The Lost Magic' in this genre. This fanfiction takes the idea of squinting hard at the existing magic in the Harry Potter world and expands it. It shows how there could be whole new areas of magic that the characters are just on the verge of discovering. It's really exciting as it combines the familiar elements of the series with new and innovative magical concepts.
A fanfic could also focus on a scenario where Nagini has a change of heart. For example, she could start to resist Voldemort's control due to some unforeseen bond with a character in the Harry Potter universe, like a kind wizard who tries to communicate with her on a deeper level.
One possible plot idea could be that Harry Potter's squinting at Shacklebolt is a sign of his suspicion. Maybe he has noticed some strange behavior from Shacklebolt that makes him think there is more going on. For example, Shacklebolt could be involved in a secret mission that Harry initially misinterprets as something more sinister.
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 possible fanfiction could be that Harry Potter is kidnapped by a dark wizard who has some strange power that makes Harry squint. Maybe this wizard is trying to use Harry's unique connection to Voldemort for some dark ritual. Harry has to use his wits and the few spells he can manage while squinting to try and escape.
One great fanfiction could be where Harry and Neville team up to discover a hidden magic within Hogwarts. They might find a secret chamber that holds ancient spells and have to work together to unlock its mysteries. This could show their different strengths - Harry's courage and Neville's knowledge of plants and Herbology coming together in an exciting adventure.