Perhaps he's being dragged by a group of bullies, like Draco Malfoy and his cronies. Since he can't see clearly without his glasses, he's having a hard time defending himself. This could lead to a situation where he has to rely more on his other senses and magic skills to get out of the predicament.
One possible scenario could be that he's being dragged by some dark magic force in a forbidden part of Hogwarts. Maybe he lost his glasses during a fight or while being chased, and now he's in a vulnerable state. Without his glasses, his vision is blurry, adding to the sense of danger and confusion.
It could be a situation where Harry has been wrongly accused. Some overzealous magical law enforcers chain him up and confiscate his glasses as a form of punishment before a proper trial. This would create a lot of internal conflict within Harry, feeling betrayed by the very system he has been fighting for.
For the drama. It creates a sense of vulnerability for Harry. His glasses are an important part of his identity, and without them, he's at a disadvantage. This can heighten the tension in the story.
It could be part of a magical curse. The curse made him lose his glasses and trapped him in a cage. Maybe it was cast by a jealous student at Hogwarts who wanted to get back at Harry for always being in the spotlight. In the cage, Harry has to figure out how to break the curse and get his glasses back, all while dealing with the limitations of his impaired vision.
Hermione could be one of his allies. She's smart and resourceful, and she would do everything she can to get Harry out of the cell. Even without his glasses, Harry would recognize her voice and know he can trust her. Another possible ally could be Dobby. Dobby has a special connection with Harry and his magic could be useful in getting Harry out of the cell, like apparating in to bring Harry his glasses or help him escape directly.
One possible plotline could be that Harry is captured by some dark wizards who want to interrogate him about the Order of the Phoenix. Without his glasses, he's at a disadvantage, trying to sense his surroundings magically while tied up. They might be trying to find out the location of the Order's secret hideout.
Perhaps in the fanfiction, Harry discovers a new spell or a magical item that can temporarily enhance his vision without glasses. But there could be a catch, like it only works for a short time or has some side - effects. This would lead to a whole adventure of him trying to find a more permanent solution while also dealing with the normal challenges in the wizarding world.
In fanfiction, if Harry Potter were without glasses, it would likely have a significant impact on his character arc. His glasses are not just a visual accessory but also a symbol of his 'nerdy' or 'outsider' status at the start. Without them, he could be more integrated into the 'cool' crowd at Hogwarts. He might also be more daring in his adventures as he wouldn't have to worry about his glasses getting broken or lost during battles or dangerous situations. This could lead to a more confident and perhaps even a more flamboyant Harry Potter in the fan - created stories.
One possibility could be that in this fanfiction, Harry's glasses are some sort of magical anchor. Without them, he might accidentally slip into a different dimension. Maybe he was in the middle of a battle at Hogwarts, his glasses got knocked off, and suddenly he vanished. It could be that the glasses were enchanted by Dumbledore long ago to keep Harry in the 'right' magical space, and without them, he's lost in a sort of limbo.
A fanfiction idea could be that without his glasses, Harry's world becomes a bit of a blur. He starts to rely more on his other senses. In the Forbidden Forest, this could be both dangerous and enlightening. He might be more attuned to the sounds and smells of the forest, but at the same time, he could easily walk into a dangerous area. His friends, Hermione and Ron, would have to be extra vigilant in protecting him. This new dynamic could change the relationships between them and lead to new adventures.
Another possibility is that there is some sort of crossover magic. Maybe a spell goes wrong and links the NCIS world to the Harry Potter world. The NCIS agents, being the resourceful people they are, quickly adapt to the situation. They learn about the danger Harry is in, perhaps from Hermione who has some knowledge of both worlds now. Then they use their own brand of justice and skills to save Harry from whatever dark forces are after him.