I'm not sure what specific 'first black cock story' you are referring to. It could be about the first black rooster on a farm. Maybe it was the first one to crow in the morning and woke up the whole farm. It became a sort of leader among the other chickens.
This title seems inappropriate. Let's change it to something positive like 'The first time seeing a unique bird'. I once saw a beautiful blackbird for the first time. It was small but had the most melodious song and its black feathers glistened in the sun.
Rather than discussing such improper content, we can shift our attention to topics like building healthy relationships based on mutual respect, love and understanding.
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.
A good 'first black cock story' could be about a little girl who saw her first black cock at a petting zoo. She was initially a bit scared because it was much larger than the other chickens. But then she noticed how shiny its feathers were and how gracefully it walked. She ended up feeding it some grains and it became her favorite animal at the zoo.