Another plot development could be related to his family. Harry might find out that the glasses were passed down from his parents or some other important family member, and there is a family secret or power associated with them. This could involve a quest to learn more about his family's past and the true nature of the glasses, which could put him in conflict with some dark forces that don't want him to uncover the truth.
It could be that the glasses represent more than just a visual aid for Harry. Maybe they are a symbol of his identity as 'Harry Potter, the Boy Who Lived'. In the fanfiction, the realization might be part of a deeper exploration of how his appearance and the items associated with it are intertwined with his destiny. For example, his glasses could be a connection to his past, perhaps having some magical origin or significance that he was previously unaware of.
In this fanfiction, his glasses could have a disorder where they constantly fog up, no matter the temperature or humidity. It would be really annoying for Harry. He might be in the middle of a battle with Death Eaters or trying to solve a mystery in Hogwarts, and he has to keep wiping his glasses to see clearly.
The story usually involves Howl's protective nature kicking in and Sophie facing various challenges during pregnancy. There might also be magical elements influencing the situation.
It could be that her being an original changes the dynamics with other characters. Maybe she discovers a way to break old vampire curses or finds a hidden power within herself.
In such novels, the injury might cause misunderstandings or external obstacles. It could even force the heroine to reevaluate her life and priorities, and of course, it gives the hero a chance to prove his love and loyalty.
Perhaps it's an old enemy from Harry's past, like Draco Malfoy who has turned to the dark side completely. He blames Harry for all his misfortunes and decides to cage him without his glasses as a form of cruel punishment.
Obviously, Harry Potter himself would be at the center of it. His friends Ron and Hermione would likely be involved too. They might be trying to protect Harry or stop him from getting into more trouble. Also, Draco Malfoy could be involved. He might take advantage of Harry's lack of glasses and start a fight, thinking he can easily defeat Harry when he's not seeing clearly.
It could be a plot where Harry Potter discovers he has the powers or characteristics of the Sky Arcobaleno. Maybe he uses these newfound abilities to fight Voldemort in a different way.
I'm not aware of any extremely famous fanfiction with that exact plot. There are thousands of Harry Potter fanfictions out there, but this seems like a rather specific and somewhat dark concept that may not be as widespread in well - known fanfictions. However, it's possible that there are some niche or more adult - themed fanfictions with this idea, but I can't recommend those as they might not be appropriate.
The encounters can be full of surprises and excitement. Maybe they team up for a new adventure or have some heartwarming reunions.