Well, perhaps the 'best friend' is jealous of the woman's relationship and tries to steal her partner. Maybe she uses her charm and knowledge of the woman to manipulate the situation.
Well, perhaps the 'best friend' has some hidden motives. It could be that she has always been secretly in love with the woman but never showed it. Then, due to some event or change in circumstances, she decides to try and seduce the woman. For example, if the woman is going through a tough time in her relationship and the best friend sees an opportunity to be more than just a friend, she might start using her closeness to the woman in a more seductive way.
There's also a possibility that the two of them work through it. The woman might tell the best friend that she values their friendship but not in this new, seductive way. They could then try to re - establish their friendship on a more normal and healthy footing. However, it would be a long and difficult process filled with lots of emotions like guilt, anger, and confusion for both of them.
A woman knew a friend who had a son. The son was a bookworm. One day, the woman visited her friend and saw the son completely engrossed in a thick novel. She asked him about it, and he started to tell her all about the story, the characters, and the hidden meanings. The woman was amazed by his knowledge and passion for reading. They then started a small book club together just for the two of them.
Well, the plot could be that the married woman and her best friend start a business together. They face challenges like financial problems and differences in management styles. But through their strong friendship, they support each other and finally make the business a success. This shows how their friendship can thrive despite the married woman having family responsibilities as well.
There are very few such stories in mainstream literature as this is an inappropriate and unethical topic. However, if we consider some works that explore complex and dark family relationships in a more metaphorical or symbolic way, for example, in some gothic novels, there might be situations where a mother figure's over - possessiveness or improper influence over a daughter could be seen as a form of 'unhealthy seduction' in the sense of leading the daughter astray. But this is not in the literal sense of the phrase.
The friend could firmly and clearly state their discomfort and boundaries. For example, they can say something like 'I'm not comfortable with this behavior, and I consider you my friends. Please stop.' Another option is to simply cut off contact with the couple if they continue to be inappropriate.
While it's a very disturbing concept, unfortunately, there may be some real - life cases that are somewhat related, but these are extreme and unethical situations. Such cases are often related to issues of abuse of power and inappropriate boundaries in relationships. However, these are not common occurrences and are widely condemned in society.