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.
It could also be a scenario where Harry is magically bound and his glasses are removed by a powerful spell. The antagonists think that without his glasses, he'll be more vulnerable and easier to manipulate. But Harry, using his strong will and some basic magic skills he's mastered over the years, tries to break free from the bonds while also finding a way to get his glasses back so he can see clearly and fight back.
Another plotline might be that a character without glasses gets mistaken for someone else in the Glee club. This mix - up causes all sorts of funny misunderstandings and relationship drama within the group. It could also be a chance for the character to re - evaluate their identity within the club and how they are perceived by others.
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.
A possible plotline could be that during an eclipse, Harry's glasses become a portal to another dimension within the wizarding world. He steps through and finds himself in a place where the rules of magic are different. Another plotline might involve the glasses being enchanted by an eclipse - influenced spell that causes Harry to see things that others can't, like hidden messages on Hogwarts' walls.
Perhaps in this fanfiction, without his glasses, Harry's vision is magically enhanced in Azkaban in a different way. Maybe he starts to see auras or some sort of magical energy that was hidden from him before. This new vision could be related to the dark and gloomy atmosphere of Azkaban. He could use this new ability to find a way to escape or to help other prisoners. For instance, he might be able to see the weak points in the prison's magical defenses through these new 'visions' that his lack of glasses has somehow triggered.
One possible plotline could be that Harry loses his glasses during a crucial event, like a battle or a chase in the Forbidden Forest. Malfoy finds him in this vulnerable state and has to decide whether to help or hinder him. This could lead to a moment of unexpected kindness from Malfoy or a new level of animosity.
One possible plotline could be the Hogwarts students being transported to the world of Game of Thrones and having to navigate the political intrigue and power struggles using their magic. For example, Hermione could use her intelligence and knowledge of spells to outwit the scheming lords in Westeros.
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.
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.
He might be very frustrated. Without his glasses, he can't see well, which is a big handicap for him. He could be trying to use his other senses more acutely, like listening for any approaching footsteps or voices. He might also be thinking of ways to break free from the bindings using some basic spells he can do without clear vision, like a simple levitation charm to try and reach for his glasses if they're nearby.
There could be a plot where Futa Hermione becomes a key figure in the fight against dark magic. She might develop a new form of defensive magic that is based on her own characteristics. Also, her relationships with other characters could be explored in a non - romantic, but deep and meaningful way. For instance, her mentorship of younger students, or her cooperation with other Hogwarts professors to improve the curriculum to be more inclusive of different magical beings and identities.