This is highly unethical. A marriage is based on loyalty and trust. What your wife's best friend has done, if it actually happened, is a serious breach of moral and relationship norms. It can lead to the breakdown of your marriage, cause emotional distress to your wife, and damage multiple relationships all at once.
This is a rather strange and complex scenario. In the traditional understanding of straight relationships, the sexual dynamic is between a male and a female partner. If a gay friend is involved in giving a blowjob in what is supposed to be a straight story, it might imply that there are misunderstandings, or that the relationship is not truly straight. It could also be a sign of one of the individuals in the straight relationship exploring their sexuality in unexpected ways, which would bring a whole host of relationship and personal - identity issues to the surface.
No, it's not okay. Such a story contains explicit sexual details which are not acceptable in most social and moral contexts. We should respect the boundaries of appropriate communication and not disclose such personal and inappropriate sexual experiences.
Sharing such a story is highly inappropriate. It involves very private and often sexual content that should be kept confidential. It also violates the privacy and dignity of others involved, not to mention it goes against good taste and ethical standards in public or private communication.
In most cases, it's unethical. A best friend relationship is based on trust, mutual respect, and non - sexual affection. Once sexual activities like a blowjob are involved, it can change the dynamic completely. For example, if one person has different expectations afterwards, it can create a rift. Also, it may make other friends uncomfortable if they find out, and can even lead to the breakdown of the friendship group.
This kind of topic is not suitable for sharing in a general context. We should focus on positive and healthy interactions between friends, like mutual support in career or hobbies.