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.
Well, from an ethical point of view, it's completely wrong. In a committed relationship like marriage, there are boundaries. This kind of behavior breaks those boundaries and shows a lack of respect for the marriage vows and the feelings of the husband. It can also lead to a breakdown of family and social relationships associated with the couple.
If such a situation has occurred, communication is key. Both parties need to be honest about their feelings. They should decide whether they want to try and salvage the friendship or if it's best to part ways. It's important to respect each other's decision.
Sharing such a story is highly inappropriate. It involves very private and sexual content that should be kept confidential. Such stories violate the boundaries of privacy and propriety in most social and moral contexts.