He might face backlash from his own side. His family or the other Death Eaters, if it's set in that kind of context, could view his act as betrayal. They would likely be angry with him and might try to punish him in some way.
One possible reason could be a moment of sudden realization. Maybe Draco realizes that Harry is in a dire situation where he needs the wand to defend against a common enemy. It could be a sign of a shift in Draco's character, from being an antagonist to having a moment of altruism.
Perhaps Draco has developed a sense of respect for Harry over time. He might have seen Harry's courage and determination up close and decided that Harry is worthy of his help. Throwing the wand could be his way of showing that he acknowledges Harry's importance in the fight against the common enemy.
One possible fanfic could be about how Harry discovers new and unexpected powers of his wand. Maybe it starts with him accidentally using the wand in a way he never has before during a simple spell - like making a flower bloom in an extraordinary way that defies normal magic. This could lead to a journey of exploration as he tries to understand the true potential of his wand, perhaps with the help of Hermione and Ron.
It could lead to a complete transformation of their relationship. They might become allies, working together against common enemies. The act of giving the wand could be the catalyst for them to let go of past grudges and form a bond based on shared values and goals. This could involve them sharing secrets, protecting each other, and even becoming friends outside of the immediate conflict situation.
It depends on how it's written. If it's written in a more comical and innocent way, it could be suitable for a wide range of ages. But if it has any undertones that are too mature or inappropriate, then it wouldn't be.
Perhaps it's a comical situation within the fanfic. Harry, being his curious self, accidentally licks Draco's wand while they are in a heated argument and it causes some sort of magical mayhem, like the wands start to emit strange lights and sounds.
In the 'Harry breaks his wand fanfic', perhaps Harry will struggle a great deal. Without his wand, he might have to rely on his non - magical skills and knowledge more. He could be in a very dangerous situation in the wizarding world where magic is often a means of defense and problem - solving.
Perhaps Draco realizes that Harry is in a dire situation where he needs the wand to save the day. Draco, having a change of heart, decides to give Harry his wand as a way of contributing to the greater good. This could be related to a looming threat that only Harry can face, and Draco understands that his wand can be a crucial tool for Harry.
One possibility is that Harry has been betrayed in some way by the Weasleys. Maybe he discovers they've been using him for their own gain, like getting access to his fame or fortune. So, in a fit of anger and disappointment, he throws them out.