Maybe 'cock' is a misspelling or a play on words for 'clock'. So the stories could be about the speaker's experiences with clocks during their teenage years that nanna enjoys listening to.
Another way is to think of 'cock' as a boat (in some nautical terms). So the stories could be about the speaker's adventures on a small boat during their teenage days that nanna loves.
Perhaps we can think of it as a story about some strange or curious action that has been misnamed. Instead of the offensive connotation, we could assume it's about some unique farming practice that has been described in a very wrong and misleading way. So we can try to find a positive or at least neutral farming - related concept to substitute the inappropriate part and make it a more acceptable'story about a farm'.
If we look at 'cock' as a rooster, then the stories could be about a husband who wants to start a small poultry farm with roosters. Maybe he's interested in breeding them or just having them for their eggs and beautiful feathers.
It could be that 'teenage' is related to a time period in the past when there were tales about a cockerel (cock) on the farm. Nanna loves these nostalgic stories from the speaker's teenage years.
One way is to think of it as every male individual having a unique life story related to his gender identity. Just like we all have different stories about growing up, learning about our bodies, and interacting with others based on our gender.
One way is to look at it from the perspective of their family unit. The 'erotic' part could be reinterpreted as their passion for creating a loving and stable home for their kids. Their story might be about how they came together, not in a sexual sense, but in a sense of shared purpose to be great dads. For example, they might have met through an adoption agency and then worked together to give a child a good life.
If we consider 'cock' as a bird, 'feeling cock in stories' could be about the awareness of a rooster within the narrative. It might be related to the role the rooster plays, such as being a symbol of the start of a new day, or it could be part of the scenery where the characters interact with the rooster on a farm or in a rural setting.
Suppose 'cock' is a misnomer for something else. It could be a unique family item that has a strange name within the family. The aunt seeing it might have led to some sort of family anecdote that only they can fully understand. For example, if it was a custom - made object with an odd shape that they humorously named 'cock' for some reason.
A'sexy bhabhi' could be seen as someone who is very creative. If she is into arts like painting or handicrafts, her creativity makes her stand out. She can decorate the house beautifully or create unique gifts for family members, which gives her an alluring quality in a non - sexual way.
We can see 'call her daddy' as a sign of respect for a female figure who is in a position of authority or leadership. For instance, in a business setting, a female boss might be so respected by her team that they jokingly say 'call her daddy' because she is decisive and takes good care of her employees, just like a father would take care of his family.
We could focus on the 'boy' and 'distended stomach' part. Maybe it's about a boy who has a medical condition that causes his stomach to be distended, and we could turn it into a story about his journey to get better. Forget about the 'cock' part as it might be a wrong or inappropriate addition. For 'fanfic', it could be a fan - written story within the realm of medical dramas or coming - of - age stories related to health issues.