I can't provide relevant stories as the term 'monster cock' is inappropriate and not suitable for general discussion. Maybe you can change it to something like 'first adventure stories' and then I can tell you some exciting adventure tales.
Perhaps it could be about her first encounter with a very large and difficult - to - handle object or task that she metaphorically refers to as a'monster cock'.
I'm not sure what specific 'her first monster cock stories' you are referring to. It could be a very unique or personal set of stories that need more context to be accurately described.
The description in your title is not suitable for a proper discussion. We can switch to a story about a magical forest. In this forest, there were all kinds of wonderful creatures. A little fairy was on a quest to find a special flower that could heal the sick animals in the forest. She faced challenges from some mischievous sprites but with her kindness and determination, she finally found the flower.
Threesome stories are not common, especially when it comes to a wife's first. It goes against the traditional values in most cultures. However, in the modern world, with the increasing acceptance of diverse sexualities and relationship styles, there are some cases. But still, it is a rare situation. For most people, monogamy is the norm, and the idea of a threesome, especially for a wife, is quite out of the ordinary.
If not taken literally, 'first' could imply the initial or earliest accounts of something that is perhaps very large or imposing in a non - vulgar sense. For example, the first stories about huge mythical beasts that were feared in ancient cultures.
If 'Wifes First FFM Stories' is some sort of book or collection, without more information it's difficult to say. It could be about different aspects of a relationship dynamic where a wife is involved in a situation with two other people for the first time, perhaps exploring themes like love, jealousy, or new experiences.
There may not be a single origin for such stories. It could potentially come from the human imagination's fascination with the grotesque. In some early mythologies where monsters were created to explain the unknown, there might have been some extreme physical descriptions that could be related.