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.
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.
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.
Another possibility is that Stiles is there because of a sense of obligation. Perhaps Peter has done something for Stiles in the past, like saving his life or helping him out of a difficult situation. So, Stiles feels like he owes it to Peter to visit him in the hospital and make sure he's okay.
Peter might be initially suspicious. He's not always the most trusting character. He could wonder what Stiles really wants or if there's some kind of ulterior motive behind Stiles' request for help.
One common theme is the exploration of their complex relationship. Since they have different personalities and backgrounds in the show, fanfiction often dives into how they interact and influence each other. Another theme is the supernatural elements. Given the nature of the show, stories might involve them facing supernatural threats together or having unique supernatural abilities related to their bond.
One great Peter Stiles fanfiction is 'Peter's Journey'. It delves deep into his character development, showing his growth from a shy and reserved person to a confident individual. The story has a great plot that keeps you hooked from start to finish.