What might happen next in the fanfiction where Harry Potter is asked by Draco to give back his glasses?

Well, it could be that Draco has some sort of bet with Harry. Maybe he wagered his glasses on a Quidditch match or a wizarding duel and lost. So he's demanding them back in a rather forceful way. This could lead to a lot of tension between the two, and their friends might get involved too, trying to either mediate or take sides.

Maybe Draco takes the glasses as a form of teasing. He shows them off to his Slytherin friends. But then, Hermione catches him with the glasses and scolds him. Draco, not wanting to be seen as a bully in front of Hermione (who he might secretly respect), decides to return the glasses. This could lead to a more complex relationship between Draco, Harry, and Hermione in the fanfiction.

He could discover a hidden power within himself while lying there. Since he's always in the midst of action, this forced rest might give him time to tap into some latent magic ability he didn't know he had.

Snape could be very cold at first, but then his natural instinct as a healer (since he is quite good at potions which are often used for healing) might take over. He might give Harry a potion to ease the pain and start to patch him up. All the while, he would probably be scolding Harry for being so reckless and getting into a situation where he got injured.

In fanfiction, the possibilities are endless. It could be that they go on an adventure to a previously unknown magical land or face a powerful dark wizard who was thought to be defeated.

Well, it could go in many directions. They might travel to a previously unknown magical realm or encounter creatures that were only hinted at in the original series.

Perhaps Snape would force them to work together on a task as punishment. This could be something like cleaning the Potions classroom without magic or helping in the Forbidden Forest. During this time, they might start to understand each other better. Harry could see that Draco isn't just a spoiled brat all the time, and Draco could see that Harry has more depth than he initially thought.

Naruto might get the sword and immediately face a challenge where he has to figure out how to use it. He could struggle with the sword's unique abilities at first.

Maybe Harry is unable to perform basic spells because he's so coddled that he hasn't had the chance to practice properly. So, his friends have to constantly protect him from minor threats like a pesky pixie.

In this fanfiction, Harry could be a player in the sense of being a political player within the wizarding world. He might be secretly forming alliances with different wizarding families to gain power and influence. He uses his status as 'the boy who lived' to his advantage. In relationships, he could be a bit of a heartbreaker. He goes on dates with Hermione, Ginny, and other girls, but is never fully committed, causing some drama and tension among his friends and the girls themselves.