One common theme is the power dynamic. Since Peter is often portrayed as a more experienced and powerful character in the Teen Wolf universe, and fem Stiles can be seen as a new or underestimated force. Their interactions can explore how power is shared or transferred between them. Another theme is the mystery aspect. Stiles is known for her curiosity, and Peter has his own secrets. So stories might revolve around them uncovering secrets together.
One popular fem Stiles x Peter fanfiction might be 'The Unexpected Bond'. It explores their relationship in a really interesting way, with great character development.
One great place to start looking for fem Stiles and Peter fanfiction is Archive of Our Own (AO3). There are many stories there that explore different dynamics between them. Some might focus on a romantic relationship, while others could be more about a platonic adventure or a mentorship kind of bond. You can also check out fanfiction.net, but AO3 generally has a wider range of content and better tagging system to help you find exactly what you're looking for.
There could be other members of Peter's pack such as Derek. Derek often plays an important role in stories related to packs. He might be initially skeptical of Stiles being part of the pack.
On the other hand, Stiles is also known for his quick thinking. He might start to try and bargain with Peter. He could offer to help Peter in some way if Peter lets him go. For example, if there's a problem in the supernatural community that Peter is facing, Stiles could say he'll use his human ingenuity to solve it. Also, Stiles could be angry. He might start shouting at Peter, calling him out on his actions, and trying to make Peter see how wrong this is.
Stiles usually reacts with a mix of fear and defiance. He's afraid because he's in a dangerous situation, but his strong - willed nature makes him defiant. For example, in many fanfictions, he'll shout at Peter, trying to show that he won't be easily broken.
I really like 'A New Alliance'. In this fanfic, fem Stiles is thrown into the world of Klaus. There are lots of action - packed scenes as they team up against common enemies. The chemistry between them is intense and the writer does a good job of portraying their complex personalities.
At first, it might be a tentative alliance. Stiles could be initially drawn to Peter for his knowledge. Peter, seeing Stiles' potential, starts to include him more in his plans. As time goes on, they might develop a mutual understanding. Stiles begins to trust Peter more and more, and Peter starts to value Stiles not just for his help but also as a friend or something more.
It could be that Stiles is in some kind of danger, perhaps from another supernatural being. And he goes to Peter because Peter has certain powers or knowledge that could protect him. For example, Peter might know how to defeat a particular enemy or how to get out of a tricky situation involving magic or some other supernatural element.