He might start to compare the real Hermione with the versions in the fanfiction, which could cause some confusion in their real - life relationship.
Ron's obsession could also affect his relationships with other friends. If he's constantly thinking about Hermione in the context of fanfiction, he might neglect his friendships with Harry or other classmates. Also, it could potentially create an awkward situation if Hermione ever finds out about his obsession, as it might make her feel objectified in a way.
She might start to compare the real Percy (if he exists in the same universe) to the fan - created versions. This could lead to misunderstandings or unrealistic expectations.
Piper could become so engrossed in the fanfiction that she neglects her own real - life relationships and responsibilities. For example, she might skip out on meetings with friends or not do her schoolwork (assuming she's a student) because she's too busy reading Percy fanfiction.
He might start to compare the fanfiction world too much with the real Naruto story, which could lead to some confusion. For example, if a fanfiction has a completely different view of a character's personality, he may struggle to separate it from the original.
She might spend a lot of time reading and writing fanfiction, which could lead to less time for other activities like socializing or doing school/work - related tasks.
Dudley could become more interested in the magical world. He might start to learn more about magic, spells, and the wizarding community, which could open up new perspectives for him.
Hermione might seek revenge. Given her intelligence and magical abilities, she could use her skills to get back at Harry and Ron for their betrayal. This could lead to a big rift in their friendship and even endanger their common goals in the wizarding world. She might also side with other characters who are against Harry and Ron, changing the whole dynamic of the story.
Maybe it's because he has deep, unexpressed feelings for Hermione in the original story. Fanfiction allows him to be in different scenarios with her that he might have secretly desired in the real plot.
One reason could be his status as the Boy Who Lived. In the original story, Harry has this special aura about him, and in fanfiction, Hermione might be drawn to that in an obsessive way. Also, his bravery and leadership qualities could be factors that make Hermione overly interested in him.
There could be a break in their friendship. Ron might realize he made a mistake, but Hermione might not be so quick to forgive. It could take a long time for them to get back to the way they were, if they ever do. They might have to go through a lot of awkward moments and difficult conversations.
Sometimes, the plotlines in fanfiction can be a bit outlandish. If Ron is constantly getting into trouble in a way that Hermione has to constantly clean up after him, it would be understandable for her to be fed up. This could be different from the more equal partnership they had in the original series.