Zach stopping Hannah could be due to a variety of factors. Maybe he was scared of the consequences of their interaction or was dealing with his own internal struggles that made him act that way. It's possible that new information came to light that made him change his mind about supporting her.
Well, it could be because of a deep connection they have that wasn't shown in the original story.
Well, you could find fanfictions where they team up for a special project, or maybe there's a forbidden love angle. Sometimes, it's about them finding support in each other during difficult times.
Maybe it's for a fresh start or to escape some past trauma. It could be a plot device to introduce new developments.
Well, there could be a storyline where they have a secret romance that nobody expects.
The relationship between Hannah and Zach in fanfiction is highly diverse. It could be a mentor-mentee kind of bond, or they could be rivals who eventually grow closer. It's really up to the creativity of the fanfic writer.
It could be that Zach realizes he missed out on something important or acted wrongly in a situation. That's why he has regrets.
Maybe it's because Clay has deep feelings for Hannah and wants to protect her at all costs.
Maybe it's to create more tension and emotional depth in the fanfiction. Pregnancy often brings a lot of changes and challenges that can drive the plot forward.
There could be various reasons. Sometimes fans are drawn to creating such fanfiction to give characters new experiences or to fulfill their own fantasies. In the case of Zach in 13 Reasons Why, it might be because they saw certain qualities or potential storylines that could be developed in a gay context.
Well, sometimes in fanfiction, writers take liberties to create unexpected plotlines. Maybe this pregnancy was a way to bring a fresh perspective or add more layers to the story of Hannah and Bryce.