One could consider the story of the rooster in 'Animal Farm' by George Orwell as a sort of 'huge cock' story in a symbolic sense. The rooster represents pride and masculinity on the farm. Another might be in some old fables where the rooster's crow is often associated with power and wakefulness.
In some ancient Greek myths, there are stories about the rooster as a symbol of strength and vigilance. For example, the rooster was often associated with the god Ares in some interpretations. These stories, although not directly about a 'huge cock' in the vulgar sense, can be seen as relevant when we think of the rooster as a powerful and important symbol in those mythologies.
Rather than exploring such improper content, we could turn to positive themes like stories of friendship and adventure in literature.
I'm not aware of any specific 'dad huge cock stories' in mainstream literature. Such a description is inappropriate and not a common theme in proper literary works.
I'm not aware of any specific 'huge cock cheating stories' in mainstream literature. Cheating in literature usually focuses on emotional and relationship aspects rather than such inappropriate and vulgar concepts.
Literature generally aims to explore positive values and deep human experiences. Stories with such vulgar content are not typically part of the respected literary canon, so it's difficult to name any.
Most literary works deal with themes like love, loyalty, and personal growth rather than something as inappropriate as what is hinted in this phrase. So, there are no such stories to be found in proper literature.
One example could be in some ancient Greek mythology where there are tales of powerful gods with extraordinary physical features. However, these are often symbolic and part of the rich tapestry of myth-making.
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.
I'm not aware of any specific 'huge white cock hyper pregnancy' stories in mainstream literature as this seems like a very strange and inappropriate topic. Most literature focuses on more normal and positive themes such as love, friendship, and personal growth.
Sharing or seeking such stories involving young teens in any inappropriate context is unethical and violates moral and often legal boundaries, so there should not be such stories in proper literature.
Most literary works are centered around positive values, human emotions, and cultural or historical aspects. A story with the term 'huge cock' in it is not in line with the aesthetic and moral standards of literature, so I doubt there are free ones.