One possible plot twist could be that Stiles has been a werewolf all along but has been using some sort of magic or potion to suppress his werewolf side. This could be revealed when he is put in a life - or - death situation and his true nature emerges to save the day.
In Stiles werewolf fanfiction, Stiles is often depicted as intelligent. He uses his smarts to navigate the complex world of werewolves. For example, he might figure out a way to break a werewolf curse using his knowledge.
If his friends found out, they would all react differently. Isaac might tease him a bit about it, but in a friendly way. Derek, on the other hand, would be more stoic and might wonder if there was something deeper behind Stiles' interest. Stiles would have to defend himself, saying that he just finds the werewolf concept in fanfiction fascinating. His friends would then start to notice little things about Stiles that they hadn't before, like his knowledge of werewolf lore that he's picked up from the fanfiction, and it could change their dynamic in an interesting way.
His best friend could discover it. Since they are so close, they might notice something different about Stiles that makes them suspect he's actually a girl.
Well, it could be that Stiles is secretly a girl and in the fanfiction, this secret is slowly revealed as he falls in love with someone. And the person he loves starts to notice little things that don't quite add up with his supposed male identity, like his more delicate features or his different style of communication.
Some of his friends might be really surprised. Scott, for example, might be a bit worried that Stiles' vampire obsession could lead him into dangerous situations. Lydia, on the other hand, could be more intrigued and might want to know more about the fanfiction. She might see it as an interesting intellectual pursuit.
One common theme is the struggle to maintain a normal life. Stiles often has to deal with hiding his fame from those closest to him, like his friends and family. Another theme is the allure of the fame itself. Sometimes he's tempted by the perks of being famous, but also realizes the downsides.
One popular Stiles werewolf fanfiction is 'The Alpha's Mate'. It has an interesting plot where Stiles discovers his unique connection to the werewolf pack. Another great one is 'Stiles: The Hidden Werewolf'. It focuses on Stiles hiding his werewolf nature from his friends at first.
A plotline might be that Stiles got secretly married while on a trip away from his friends. When he returns, he has to figure out how to integrate his new married life into his old friendships. There could be comical moments like trying to hide his wedding ring or coming up with excuses for why he can't hang out at certain times. Also, the relationship within the marriage could be explored. Is it a marriage of convenience that slowly turns into love? Or was it a passionate love - at - first - sight kind of marriage that they now have to deal with in secret.
Well, it could be that Stiles' secret vampire fanfiction is actually a premonition. He starts writing about a particular vampire who then shows up in real life. But this vampire is different from the typical ones in the stories. Instead of being evil, it's trying to find a way to co - exist with humans. Stiles then has to use his knowledge from the fanfiction to help this vampire, all while still keeping his vampire - loving side a secret from his friends.