It might focus on their adventures in a new setting or alternate universe. Or, it could delve into their past and how it affects their present interactions.
Common themes could include how they overcome challenges together, or how their connection deepens over time. The storylines might focus on their shared experiences and how they support each other through difficult situations.
The fanfiction might explore alternate endings or fill in gaps in the original story. Maybe there could be romantic plots or friendship developments not shown in the show.
Justin might have abused fanfiction because he was going through a personal issue that affected his judgment or he simply didn't appreciate the creativity involved.