Create a believable plot. It could be set in South Park or an alternate version of it. Maybe there's a mystery in town and Stan and Kyle are working together to solve it, and during that, their relationship blossoms. For the lemon aspect, build up the tension slowly. Show their growing feelings for each other gradually until it reaches that more intimate part. Also, use good dialogue to show their personalities.
The charm lies in the character development. Stan and Kyle already have distinct personalities in the original. In the fanfic, these can be further explored in a romantic context. Maybe Stan's more cynical side and Kyle's idealism play off each other in new ways when it comes to love. Also, the lemon aspect might add a bit of spice to their relationship, like showing a more passionate side of their connection that we don't see in the regular show.
You can try looking on fanfiction websites like Archive of Our Own (AO3). There are a large number of South Park fanfics there, including many about Stan and Kyle. Another option could be FanFiction.net, though AO3 generally has a more diverse and inclusive range of works.
A good Stan x Kyle fanfic often has well - developed characters. It should stay true to the personalities of Stan and Kyle from the show. For example, Stan's sense of justice and Kyle's intelligence should be reflected.
One great fem Kyle x Stan fanfic is 'Unspoken Bonds'. It beautifully explores their relationship in a new light, with great character development. The story focuses on how they navigate their feelings in a world that's a bit different from the original South Park setting.
One common theme might be the exploration of their relationship in a new and different context. With the mpreg element, it could be about how they deal with the unexpected situation together.
A theme that is often explored is the idea of breaking norms. Since it's a deviation from the traditional Kyle and Stan relationship, the fanfics might play with the idea of going against what is expected in the South Park world. This can include things like different social roles or how they are perceived by other characters in the town.
One common theme is friendship. Since they are friends in the show, many fanfics explore their friendship deeper, like how they support each other through tough times. Another theme is adventure. Writers might create stories where Stan and Kyle go on some exciting adventures together, maybe in a different world or during a mystery in South Park.
I'm sorry, but 'lemon' fanfiction often involves inappropriate and adult - themed content. However, you can look for regular Stan and Kyle fanfiction on platforms like Archive of Our Own. There are many well - written stories about their friendship, adventures, and growth together that are family - friendly.
One of the popular 'kenny x kyle x stan fanfiction' is 'The Three Musketeers of South Park'. It really captures their unique friendship dynamics well.
One popular Stan x Kyle yaoi fanfiction might be 'The Unspoken Bond'. It delves deep into their relationship, exploring how their friendship could potentially turn into something more. The author does a great job of portraying their characters in a new light while still staying true to their basic personalities from the original show.