In some fictional stories, a character might consider it because they are in a situation where they are feeling unloved or unappreciated in their own relationships. But this is no excuse. They might also be influenced by a sense of envy towards their best friend's relationship, thinking that having his wife would somehow make them feel better. However, all these reasons are just wrong and unethical justifications in the real world.
Maybe some people have a very abnormal state of mind. They might be attracted to the wrong person due to some personal issues they haven't dealt with properly, but this is still unacceptable. It could also be that they are in a state of extreme impulsiveness without considering the consequences.
One possible reason could be dissatisfaction in your relationship. Maybe there were issues that were not being addressed, like lack of emotional connection or sexual incompatibility. Another reason could be that your friend was overly persuasive or took advantage of a vulnerable moment for your wife. It could also be that there were some underlying issues with your wife's self - control or moral values.
In some fictional stories, a lack of emotional connection with her partner might be a reason. If she feels constantly ignored or unloved, she may be pushed towards the wrong path.
Perhaps some people with a very warped sense of morality might create such stories to shock others. They may be trying to break taboos for the sake of getting attention.
One important thing to consider is how it will affect your friendship. If things go wrong, it could potentially ruin a very precious relationship. Also, you need to think about your feelings clearly. Are you truly attracted to your best friend in a romantic and sexual way, or is it just a momentary impulse? Another aspect is the social circle you both are in. There might be a lot of gossip and reactions from mutual friends which could add pressure.
One possible reason could be a lack of emotional connection in the marriage. Maybe she felt neglected and found that connection with the best friend. Another reason might be attraction that developed over time due to shared interests or experiences. Or it could be a moment of weakness and poor judgment on her part.
There are multiple consequences. Firstly, it will destroy the friendship. Your best friend will feel betrayed and hurt deeply. Secondly, it can lead to the breakdown of the marriage. The wife may also feel guilty and conflicted. Moreover, your reputation will be severely damaged. People will see you as untrustworthy and immoral.
In a fictional 'wife's best friend sex story', perhaps it could be a situation where there are misunderstandings. For example, the wife might misinterpret an innocent interaction between her partner and her best friend as something more. It could lead to a lot of drama and conflict in the story, but ultimately end up with everyone realizing it was all a big mistake.
There are several consequences. Firstly, your social circle might be affected. Other friends may take sides if things go wrong between you two. Secondly, your emotional state could be in turmoil. You might feel confused about your feelings for your friend. And thirdly, if you value the friendship for non - sexual reasons, having sex could change the dynamic completely and you may end up losing a great friendship.
Well, the most obvious consequence is the end of the friendship. Imagine how betrayed your friend would feel. In a story I heard, the friend who was betrayed became extremely depressed and started having problems at work. And the relationship between the wife and her husband deteriorated so much that they ended up in a bitter divorce.