There might be some misunderstandings. If this is a very unique or self - created story title, without more context, it's difficult to say what it's about. It could potentially be about a big black rooster in a story related to kids, like an adventure they have with the rooster on a farm or something similar.
Kids' stories should be positive and clean. Let's consider a story about a big black horse. The big black horse was strong and brave. It carried the knight in shining armor to faraway lands, and the children in the village would watch in awe as they passed by.
Using inappropriate terms is not acceptable. How about a story of a big black horse? There was a magnificent big black horse on a ranch. It was strong and fast, and it was the favorite of the rancher. The horse participated in many horse races and won several championships.
There was a big black dog. It was the friendliest dog in the town. Every day, it would wait at the school gate for the kids to come out. Then it would run around with them, wagging its tail joyfully. The kids loved to pet it and give it treats.
I'm not sure specifically what this 'first big black cock story' refers to. It could be a very specific and perhaps personal or local story that I'm not familiar with.
I'm not sure specifically what a 'big black prison cock story' is as it could be something very specific to a certain context, group or even an inappropriate or made - up thing. Without more information, it's hard to say.
I'm not sure if there is a specific 'big cock black panther she fanfiction' as it's not a very common or mainstream topic. Fanfiction can cover a wide variety of themes, but this one seems rather unusual. You might have to search through various fanfiction platforms very thoroughly.