It is generally not considered ethical. Such a situation often involves betrayal and violation of trust in a relationship. In a committed marriage, there should be loyalty and respect between the partners, and creating stories around a situation that undermines this is not morally right.
There was a bi guy who had a wife. His best friend was always around, and they were all into some alternative relationship styles. The bi guy, after much communication with his wife, introduced his best friend into their relationship in a more intimate way. They shared hobbies, evenings together, and gradually, the relationship evolved into something more complex. The three of them learned to communicate openly about their boundaries and feelings, which made the situation work for them.
Well, a wife's best friend could be involved in stories like helping the couple during a difficult time in their marriage. For example, when the husband lost his job, the best friend might have supported the wife emotionally and also helped them find resources to get through the financial hardship. Another story could be about how the best friend and the wife planned a surprise birthday party for the husband. They secretly coordinated all the details, invited all his friends and family, and made it a truly memorable event for him.
It is not ethical at all. A best friend's relationship is based on trust, and an erotic story about his wife is a huge betrayal of that trust. It can lead to the breakdown of the friendship and create a lot of emotional turmoil for all parties involved.
There could also be a story where the wife's best friend introduced the couple to a new hobby. For example, she was into painting and invited them to a local art class. At first, the couple was a bit hesitant, but they ended up loving it. This new shared hobby brought the couple closer together and also strengthened the bond between the wife and her best friend as they all had something fun to do together.
One of my guy best friend stories is when we went on a road trip. We got lost in the middle of nowhere but instead of panicking, we just laughed it off. We ended up finding this small, charming diner and had the best meal ever. It was a simple moment but it really strengthened our friendship.
My guy best friend and I used to play basketball every weekend. One day, there was a local tournament. We decided to enter as a team. We were the underdogs but we supported each other throughout the games. In the final, we were losing by a large margin. However, we didn't give up. We encouraged each other and made an amazing comeback to win the tournament. It was a story of true friendship and perseverance.
There could be jealousy issues. The bi guy might feel jealous if his wife and best friend become too close without including him. Also, the wife could end up feeling used or confused about her place in this complex relationship.