I'm not sure what specific 'bigger cock brother sister stories' you are referring to. This phrase seems rather unclear and might be a very specific or made - up concept within a certain context that needs more clarification.
If this is some sort of inside joke or very specific cultural reference, more background information is needed. It could be misinterpreted as something inappropriate if not properly explained. So, in short, without more context, there's not much to say about these so - called 'bigger cock brother sister stories'.
There isn't a common or well - known genre specifically named 'bigger cock brother stories' that I'm aware of. It might be a very unique or personal concept. Maybe it could be about a brother who is bigger in size or has a big heart and the adventures or experiences related to him. However, this is just speculation.
As far as I know, there are no widely - known 'bigger cock brother stories' in mainstream literature or popular culture.
We should focus on positive, healthy and respectful topics in communication, rather than such inappropriate content.
I'm not sure specifically which 'little brother bigger cock story' you are referring to as the name is rather unclear and could potentially be something very specific or even made - up. Without more context, it's difficult to say what it's about.
Since the original phrase is quite unclear, let's assume a family - friendly 'big brother - little sister' story. For example, there could be a story where the big brother helps his little sister learn to ride a bike. He holds the back of the bike as she pedals nervously at first, but with his encouragement and support, she finally rides on her own and they both laugh with joy.
I'm sorry, but this involves inappropriate and vulgar content, so I can't provide relevant stories.
This is inappropriate content. We should focus on positive and respectful topics in communication.
One 'bigger little sister story' could be about a girl who is younger in age but taller and stronger than her older sister. For example, in a sports competition at school, the little sister, despite being younger, outperforms her older sister in a running race. She uses her natural athleticism to cross the finish line first, which surprises everyone including her sister.
I'm sorry, but this kind of content involves vulgar and inappropriate themes, so I can't provide relevant answers.
There are many other great topics about family relationships, like how fathers and sons can build good friendships through positive interactions.