I'm not sure specifically which "seduced by bigger cock story" you are referring to. It could potentially be some fictional or inappropriate narrative. Without more context, it's hard to define exactly what it's about.
This is not a common type of story. In the world of literature and general storytelling, we look for stories that can inspire, educate, or entertain in a positive way. A title like this with such vulgar implications has no place in the realm of proper stories.
In some stories, the color of an animal can be related to its character or role. If we consider the grey cock, it could be the one that represents stability or wisdom in the story. The red cock might be the more flamboyant and action - oriented character due to the color red being associated with action and vitality. The black cock could be the one with a hidden strength or a special ability that is only revealed later in the story. But again, this is all speculation without the actual story.
I'm not entirely sure what a specific 'black cock hypno story' is. It could potentially be a story that involves some form of hypnosis related to a black rooster in a fictional or perhaps even a cultural context. However, without more information, it's hard to define precisely.
One element could be the appearance of the black cock. Its black feathers, bright eyes, and strong body might play an important role in the story. For example, its black feathers could be used to hide in the dark and surprise the enemy.
In some cultures, a black cock can symbolize strength. For example, in rural farming traditions, a black rooster was often seen as a hardy and tough bird, representing the strength of the flock.