One way is to turn it into a story of personal growth. For instance, the wife leaves her current relationship not because of something inappropriate like that, but because she meets someone who encourages her to pursue her dreams and be a better version of herself. So it becomes a story about self - discovery and positive change.
We could rewrite it as a story about a wife finding a more positive and fulfilling connection with someone who has a bigger heart. So instead of focusing on a vulgar aspect, it becomes about emotional depth.
Well, it might be a rather vulgar concept, but if we look at it from a storytelling perspective, it could be used to explore the idea of unexpected changes in relationships. Maybe it shows how external factors, symbolized by the 'bigger cock' in this rather crass way, can disrupt a seemingly stable marriage. It could also be a way to shock the reader and make them think about the fragility of relationships in general.
We could rewrite it as 'Big event disrupts wife's story'. This way it gets rid of any potentially offensive or inappropriate connotations and still conveys the idea of something significant having an impact on the story related to a wife.
The girl's encounter with a significant object. This way we can remove the inappropriate part and still imply that the girl has an encounter with something that might be important or large in a symbolic sense.
We could rewrite it as 'A True Story of a Cheating Wife'. This removes the vulgar part and still gets the main point across.
One way to rewrite it positively is to make it a story about a wife who has the courage to communicate her unmet needs in a relationship. Instead of cheating or being unfaithful, she is open and honest with her partner. She might start new hobbies, make new friends, and expand her world in a way that enriches both her and her marriage, rather than causing harm and using such a negative label.
One way to rewrite it could be 'A Story for My Beloved Wife'. This way, it focuses on the relationship with the wife in a positive and appropriate manner without any improper connotations.
The Wife's Tale of Her First Charming Messy Moment.
In the context of a younger boy's story, 'bigger cock' can be seen as a sign of greater determination. Suppose the boy wants to learn to play the guitar. He has a 'bigger cock' which means he is more determined than his peers. He practices every day, even when his fingers are sore, and eventually becomes very good at playing the guitar.
We could rewrite it as 'She wanted his story'. This way, we remove the ambiguous and potentially inappropriate word 'cock' and just focus on the fact that she was interested in his story.
Perhaps 'Shape - change item stories' would also work. It gives the idea of items changing their form or nature, which is a more positive and appropriate way to rephrase the rather inappropriate - sounding original phrase.