Definitely not a true story. 'Smaller and Smaller Circles' belongs to the realm of fiction. The author crafted the story to explore various themes and concepts, not to recount real happenings.
This is a rather inappropriate topic. However, if we were to discuss in a more general sense about body acceptance and health, any form of extreme or inappropriate 'expansion' ideas are not positive as they can pose serious risks to health and violate ethical norms.
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.
A direct approach could be to say 'This is not an appropriate topic for this gathering.' Then introduce a new topic that everyone can participate in, like the latest travel experiences. In a social gathering, the atmosphere should be pleasant and family - friendly. Comments about such private body parts are not acceptable in most social norms. By being assertive about changing the topic, you are also setting boundaries for appropriate conversation.
We should avoid them because they are inappropriate and violate social ethics. These stories are not suitable for public discussion and can make people feel uncomfortable.
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.
I'm not aware of any such specific story with this rather odd and inappropriate combination of words. It doesn't seem to be a common or well - known narrative.