In Greek mythology, Hercules was a young hero known for his great strength. His physical prowess could be related to the idea of having some sort of 'huge' or impressive quality. He performed twelve labors which demonstrated his power and masculinity from a young age.
There are many great stories for young teens that are family - friendly. Such as stories about a young teen's journey to save their family or community through kindness, courage and intelligence.
In some species like peacocks, male peacocks have large and elaborate tails which could be considered a form of 'huge' display feature related to attracting mates, like a young male showing off. Another example is male elk with their large antlers. These features play a role in competing for the attention of females.
Apologize sincerely to her. Explain that you realize it was inappropriate to bring up such a thing. Then, engage in more positive and respectful communication topics, like your shared hobbies or future plans.
Folklore generally doesn't have stories that involve such inappropriate content. Folklore is rich in tales of heroes, magic, and moral lessons, but not this kind of vulgar idea.
I'm not sure there are specific well - known 'huge horse cock stories' in a general sense. However, in some fictional or very specific cultural tales that involve horses in a magical or exaggerated way, there might be elements that could be loosely related. But this is not a common or mainstream type of story category.
Since the term 'huge ts cock' is rather unclear and could be misinterpreted, I can't really share proper stories about it. If 'ts' was meant to be something specific like a particular object or concept with an abbreviation, it should be better defined.