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.
One should firmly stop them and tell them that this is not an appropriate topic. For example, you could say 'This is too private and inappropriate, please don't talk about it.'
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.
Sharing stories about such inappropriate and unethical content involving teens is unacceptable and against moral and legal norms. We should focus on positive, healthy and legal topics.
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.
The husband's reaction could vary. Some might immediately confront the wife and the friend, demanding an explanation. Others might be so devastated that they go into a state of denial at first. In the long run, he may choose to divorce as it's a very serious violation of the marital bond, or he could try to forgive if he truly loves his wife and believes in the possibility of rebuilding trust, but it would be an extremely difficult process.
This kind of story is often baseless and unethical. In educational institutions, there are strict ethical and professional boundaries. Teachers are expected to maintain a proper and respectful relationship with students, regardless of the student's gender identity. So, in most cases, such a story is likely to be false.