Draco could be acting on orders from someone else. For example, if a more powerful dark wizard or a Slytherin senior told him to do it as part of a scheme to disrupt Harry's focus and make him more vulnerable to attacks, either physical or mental.
Maybe it's a form of power play. By taking Harry's glasses, Draco is asserting his dominance. In the wizarding world, status and power are important, and this could be Draco's way of showing that he can take what he wants from Harry, who is often seen as his rival.
In fanfiction, Harry might slap Draco because of Draco's constant taunting. Draco is often portrayed as a bully, and there could be a point where Harry just can't take it anymore.
On the other hand, it might lead to a more complex relationship. Maybe Harry starts to see Draco in a different light, as someone who is more than just a one - dimensional bully. He might start to wonder what deeper issues Draco has that would make him do such a thing.
Well, it could be anywhere! Maybe you dropped them in the common room or left them in a classroom.
In some fanfictions, it might be due to a prophecy or some magical bond. For instance, there could be a prophecy that Draco's life is intertwined with Harry's in a way that if Draco dies, something bad will happen to Harry or the wizarding world. So Harry takes on this overprotective role to ensure Draco's safety. It also adds an interesting layer to their relationship, changing it from the typical rivalry in the original books.
Maybe it was an accident. Like a wrong Floo Powder destination or some kind of misfired spell that landed Draco right at the Dursleys' doorstep just as Harry was there.
They might go to the Burrow to reconcile. Fanfiction often explores the idea of enemies becoming friends. The Burrow, being a place full of warmth and family, could be a good setting for them to start over. It's a place where they can put aside their differences and get to know each other better without the pressure of Hogwarts politics.
Well, it could be that Draco steals Harry's glasses as a prank. Maybe he wants to embarrass Harry in front of their classmates. He might hide the glasses in a secret place in Hogwarts, like in an old unused classroom, and Harry has to search for them while dealing with his blurry vision.
One possible reason could be to annoy Harry. Draco is often portrayed as a bully in the Harry Potter series, and stealing Harry's glasses is a way to make his life difficult. It could also be a power play, showing that Draco can take something important from Harry.
I'm not sure. Maybe they got lost in the magical chaos or were hidden by a mischievous spell.