Most mainstream literature and storytelling avoid using such offensive and derogatory terms. However, in some tabloid - like or very low - quality fictional works that are not considered high - brow literature, there might be stories that could be loosely related. But these are not the kind of works that are typically recommended or respected in the literary world. Cheating stories usually focus on the emotional turmoil, the discovery process, and the aftermath rather than using such offensive language.
Yes, they can be. These stories often go against traditional sexual and gender norms. Society has certain expectations of straight men, and when a story depicts a straight man changing in such a radical way sexually, it can make some people uncomfortable.
I'm not aware of any such specific stories in mainstream literature or movies that carry this rather inappropriate and unclear concept. It might be a very niche or made - up idea that doesn't have common representation in proper works.
This phrase is rather ambiguous. It might be a very local or even self - created concept for stories. It could potentially be related to some sort of secret or hidden relationship between a black - haired person (if 'black cock' is misused in that sense) and a white boy in a closet - like a secret friendship or adventure that takes place in a confined space. However, this is all just conjecture as the phrase is so open - ended.