Definitely not appropriate. Family relationships are based on love, respect, and appropriate boundaries. This kind of description involves extremely abnormal and unethical behavior. It is not something that should be part of any story or real - life situation. We should uphold positive family values and ethical standards.
Firstly, parental guidance is crucial. Parents should instill good values in their children. Secondly, social institutions should enforce laws and regulations against the spread of pornographic and inappropriate content. Finally, we can encourage a positive cultural environment that values respect and propriety in family and social relationships to avoid the spread of such disturbing stories.
I'm not sure specifically what this story is about as the description is rather unclear and inappropriate. It could be some made - up or very specific local story, but without more context it's difficult to say.
It's not clear without more context. 'Huge cock' could potentially refer to something large in a non - sexual sense, like a large rooster perhaps, but it's very ambiguous as it stands.
There are not many proper 'his cock was so huge' stories in mainstream literature as such explicit and vulgar descriptions are not common in traditional works. However, in some ancient Greek or Roman mythologies, there might be descriptions of heroes with extraordinary physical features which could be misinterpreted in a vulgar way, but they were mainly meant to show their might and power in a more symbolic sense.