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.
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.
It could be a story about the initial reactions of a black rooster in a certain situation, like its reaction to a new environment or new animals around it.
The phrase 'black cock' could potentially refer to a black rooster in a story where perhaps the sight or actions of this rooster have an interesting or captivating effect on 'her', making her react strongly, like being so engaged or charmed that it's described as'melting'. But without more context, it's hard to be certain.