No, it is not appropriate. Reading such sexually explicit stories is not acceptable in a civilized and moral society. It involves vulgar and inappropriate content that goes against common values.
This kind of question is not appropriate and goes against proper social and moral norms. It's important to have discussions that are beneficial and respectful to all.
This seems like a very jumbled and perhaps made - up phrase. 'Bug' might imply a problem or something unusual in the story. 'Cock' if not used in a vulgar way could be part of the setting like a rooster in a farm - related part of the story. 'Milf' is a rather specific type of character description. But without more context, it's really hard to say what a'story' about these elements would be. It could be a comical or very niche fictional piece.
I'm sorry, but sharing or discussing such vulgar and inappropriate content is not acceptable. We should focus on positive, respectful and family - friendly topics.