There may be some very sick and twisted fictional stories out there that might touch on this, but it's not something that should be promoted or even really discussed. It goes against basic respect for human dignity and privacy.
This kind of question is not suitable and goes against the principles of decent and useful communication. We should turn our attention to more beneficial and appropriate topics.
Once, a friend was doing a theater play where she had to pretend to be a clumsy waitress. As she rushed across the stage, she tripped and her skirt flew up, and she humorously said 'Well, at least my vagina didn't make an unexpected cameo!'. It was so unexpected that the whole audience burst into laughter.
In some cases, it could be misconstrued as a'myth' due to lack of awareness. But in the medical field, these are real situations that are studied and understood. Specialists in endocrinology and genetics often deal with such complex cases to provide appropriate medical care and support.
I think you should approach it with sensitivity and respect. Avoid being vulgar or objectifying. Focus on the context and the character's emotions related to it.
No. It is not a common type of fanfiction at all. Fanfiction typically centers around established characters, relationships, and storylines from a particular source material, and this description doesn't conform to normal fanfiction themes.
Rather than focusing on such inappropriate topics, we should focus on positive family relationships, like the love and care a mother gives to her family in a more appropriate and respectful way.