No, it's not appropriate. Cersei and Jamie's relationship in the original story already contains elements of incest, which is a controversial and unethical topic in most moral frameworks. Writing sexual fan fiction about them further crosses the line of propriety and can be offensive to many people.
Yes, in 'Game of Thrones' there are storylines involving an incestuous relationship between Cersei and Jaime Lannister. Their relationship is a complex and controversial part of the show's plot, which adds to the dark and morally ambiguous nature of the story.
It shows the moral depravity within the Lannister family. Their incestuous relationship affects their decision - making and their actions towards other characters.
One could explore their complex relationship in terms of loyalty and power. For example, how their loyalty to each other affects the political landscape in King's Landing. Their relationship is deeply intertwined with power struggles, and this could be a very interesting theme to develop.
Redemption is also a theme in some fan fictions. Given their often - immoral actions in the original story, some fan fictions explore the idea of Jaime and Cersei seeking redemption, either together or separately, and how this affects their relationship and their place in the world of Westeros.
There are no appropriate'sex stories' in a positive sense about Cersei Lannister. Her character is more about her ambition and her role in the power struggles of the Seven Kingdoms. Her relationships, like with Jaime which was incestuous, were part of her downfall and her complex character arc. It was a way to show the moral decay in the world of 'Game of Thrones' rather than just a titillating story.
In fan fiction, Margaery Tyrell and Cersei Lannister often have a complex relationship. Margaery is seen as a young, ambitious beauty who is a threat to Cersei's power. Cersei, on the other hand, is a proud and cunning woman. Their interactions can range from veiled hostility to open conflict. For example, Margaery's attempts to win over the people and the king are seen as direct challenges to Cersei's position in the court.
In fan fiction, Margaery is sometimes depicted as a symbol of new hope and change. Her family, the Tyrells, bring a different kind of prosperity to the kingdom. Cersei, on the other hand, is associated with the old, corrupt ways of the Lannisters. She is more focused on maintaining her family's power at any cost, while Margaery seems more interested in the overall well - being of the kingdom.
There are many great Cersei Lannister fanfiction stories that focus on her political machinations. For example, some stories might explore her rise to power within King's Landing, her relationships with other political figures like Tywin or Jaime in a non - sexual context. These stories can be found on popular fanfiction websites by using relevant tags such as 'Cersei Lannister, Politics' when searching.
I also like 'Cersei and Jaime: A Different Path'. This fan fiction explores an alternate universe where Jaime and Cersei make different choices early on in their lives. It shows how those choices could have changed their relationship and the entire course of events in Westeros.