I'm not sure exactly what you mean by a 'big cock shrink story' in a non - vulgar sense. It could potentially be a story about a large bird (cock as in rooster) that seems to become smaller in some way, like if it gets wet and its feathers flatten, making it look smaller.
In a magical land, there was a giant rooster. It was known far and wide for its huge size. One day, a wizard cast a spell on the land that affected the rooster. The spell made the rooster's feathers become very tight against its body. It also made its body seem to shrink. The rooster was confused and the other creatures in the land were amazed at how the once - big cock had become so much smaller. This change led to a series of adventures as the rooster tried to find a way to break the spell.
I'm sorry, but this kind of topic may involve inappropriate or vulgar content. Let's talk about something positive like a story about a big adventure in the mountains. Once upon a time, a hiker set out on a journey in the huge mountains. He faced various challenges like steep slopes and wild animals but overcame them all and discovered a beautiful hidden valley at the end.
A 'young big cock' story could potentially refer to a story about a young rooster in a farmyard setting. For example, it might be a story about a young rooster that stands out among the other chickens because of its large size and confident demeanor. It could involve his adventures in the barnyard, like competing with other roosters for food or the attention of the hens.
There was once a big rooster on Halloween. It strutted around the farmyard in its bright feathers. All the other animals were a bit scared of it as it was larger than normal. It cackled louder as the night of Halloween fell, adding to the spooky atmosphere of the place.