In the fanfiction, Harry wearing Draco's clothes can be a significant step in his character arc. It could represent his journey towards unity and breaking down the barriers between Gryffindor and Slytherin. As he puts on Draco's clothes, he's not just changing his appearance but also challenging the pre - conceived notions he had about Draco and the Slytherin house as a whole. This act could lead to him becoming more inclusive and open - minded, which are important aspects of his character development.
Draco may become more empathetic. Harry's clothes could serve as a reminder of Harry's experiences and struggles. This could make Draco more understanding towards Harry and others in similar situations. For example, if Harry has faced a lot of prejudice in his life and Draco is now wearing his clothes, Draco might start to think about how he has contributed to that prejudice and want to change.
In some fanfictions, it could be a prank gone wrong or right. Maybe Draco lost a bet and has to wear Harry's clothes as a consequence. Or it could be a mischievous plot by his friends to see his reaction when he's in Harry's attire. It might also be a way for the author to show the contrast between their personalities. Harry's clothes on Draco could highlight how different they are in nature while also showing that they might not be as far apart as they seem.
One possible scenario could be for a disguise. Maybe Harry needs to blend in among Draco's group for some sort of undercover mission at Hogwarts. Another could be as a result of a magical mishap, like a spell gone wrong in a transfiguration class that swaps their clothes. Or perhaps it's part of a bet or dare within the fanfiction's plot.
Draco becomes more empathetic. Adopting Harry makes him look beyond his old pure - blood supremacist views. He starts to understand the struggles Harry has faced.
The relationship between Harry and Draco in this fanfiction would be greatly affected. Since Harry has a connection to Draco's mom, Harry could become more empathetic towards Draco. He may realize that Draco is not just the bully he once thought. Draco might struggle with the idea that Harry has this special connection to his mom. However, as the story unfolds, they could learn to communicate better. Harry could share insights about Draco's mom that Draco never knew, and this could bridge the gap between them, leading to a less hostile and more nuanced relationship.
Another reaction could be confusion. Draco might not know how to feel. On one hand, he has his Slytherin pride and his clothes are part of that. But on the other hand, seeing Hermione in his clothes gives him a strange feeling in his stomach. He might end up being more curious about Hermione and her reasons for wearing his clothes.
At first, it's likely to be full of hostility. Draco would probably enjoy lording over Harry as his slave, and Harry would resent it. But as the story progresses, they might start to understand each other better. For instance, Draco could see Harry's strength and determination even in his slave position.
Harry might be confused at first. He doesn't understand why Draco would think he's a doll fan. So he might just shrug it off and not pay much attention, thinking Draco is just being his usual difficult self.
In many fanfictions, Draco and Harry's friendship often starts from an unexpected encounter. Maybe it's a situation where they have to work together for a common goal, like saving Hogwarts from a new dark threat. At first, they're hesitant and full of distrust because of their past rivalry. But as they get to know each other better, they start to see the good in each other. For example, Draco might show his loyalty and intelligence that Harry never noticed before, and Harry's courage and kindness could also change Draco's view of him.
He could also develop a better understanding of the 'light side'. Taking care of Harry, who represents so much of what the 'light side' stands for, even in his deaged state, makes Draco question his own alignment with the 'dark side'. This internal struggle can lead to significant character growth.