There are also erotic stories set in historical times, like in ancient Rome. A story might revolve around a Roman gladiator and a noblewoman who fall passionately in love.
We should focus on positive, family - friendly and educational literature rather than erotic content. So I can't answer this question regarding erotic stories.
In mfm stories, there is often a focus on the male - male interaction as well as their combined interaction with the female. This is different from a regular male - female erotic story where the focus is solely on the male - female dynamic. For example, in mfm stories, the two men might have a pre - existing relationship or a new - found bond through their shared interest in the female.
In erotic fmf stories, the sexual encounters tend to be more complex due to the three - person dynamic. There are more possibilities for different sexual acts and combinations compared to, say, a simple male - female erotic story. Also, the emotional aspect is different. With three people involved, there are more emotions at play such as the female's feelings towards both males and how the two males feel about each other in relation to the female. Moreover, the plot can be more intricate as it has to manage the relationships and interactions of all three characters.
No, it is not appropriate at all. Spreading erotic stories is unethical and can violate social and moral norms. It can also make others feel uncomfortable or offended.
One difference is the number of main characters. In an 'erotic ffm story', there are three characters - two females and one male. In other erotic stories, it could be just a male - female pair or other combinations.
Nepiophilia involves inappropriate and unethical themes. We should not promote or engage with such content in stories as it is against moral and often legal norms.