You should recognize it as an improper expression and not engage with it further. Instead, focus on using and promoting language that is respectful, positive, and family - friendly. If it was said in a public or shared space, you could even bring up the importance of appropriate language to those around you.
Literature usually focuses on more positive and profound themes rather than this inappropriate content. So, no, there are no such 'enormous cock stories' in proper literature.
Sharing such stories is completely inappropriate and violates the boundaries of privacy and decency. Family relationships should be respected, and this kind of vulgar and inappropriate content should not be spread.
I don't have a specific story like that. But in general, stories of a wife cheating can involve many complex elements such as relationship problems, lack of communication, and personal insecurities. However, focusing on an 'enormous cock' in such a context is inappropriate and vulgar.
I'm not sure what specific 'dads cock story' you are referring to. It could potentially be a story about a father's pet rooster. Maybe it's a story about how the dad takes care of the rooster, like feeding it, building a coop for it, and the funny or interesting things that happen around the rooster.