It is not appropriate at all. This kind of story belongs to the realm of inappropriate and private behavior. In a civilized society, we should focus on positive, respectful and ethical topics.
Sharing this kind of story is not acceptable. Intimacy within a marriage is a private matter. It violates the privacy and respect that should be maintained in a relationship and in society in general.
First, it is disrespectful to others. Everyone has the right to privacy. Second, it is against moral and ethical standards. We should promote positive and healthy content.
Rather than exploring this inappropriate topic, we could talk about positive relationship stories like how two people build a healthy and loving relationship.
Well, in the world of fanfiction, there are various genres and themes. However, this doesn't seem to be a regular one. Fanfiction is mostly about exploring relationships, new adventures of known characters, or alternative universes related to the original work. The given phrase doesn't really fit into any of the common fanfiction molds.
I'm not sure specifically which 'huge cock story' you are referring to. There could be many stories that might use this phrase in a non - vulgar way, like a story about a large rooster perhaps.
There is no well - known 'huge teen cock story' in mainstream literature or common knowledge. However, if we take the nautical meaning of 'cock' as mentioned before, there might be local tales in fishing communities about a large teen - sized boat that was significant in some way, like saving a village from a storm.