Another possibility is that it's a misnomer or a play on words. Maybe there was a misunderstanding at some point that led to this phrase being used in your family stories. It could be that a small item was thought to look like a part of a rooster in a very humorous and innocent way, and that's how the 'little cock' stories started.
It might also be that the stories are a way of connecting with others. By sharing these stories about your husband and the 'little cock', you are giving people a glimpse into your family life or your husband's character. Maybe your husband has a special way of dealing with the 'little cock' that shows his kindness or sense of humor.
The following are a few recommended ancient novels, in which the male protagonist has an inferiority complex: 1. " Thousand Years, Thousand Years, Thousand Years ": This novel is about a humble and pitiful male protagonist. He has low self-esteem and a sense of insecurity, but he loves the female protagonist deeply. The story depicted the darkness of officialdom and the complexity of human nature. The relationship between the male and female protagonists was pure and warm. I hope these recommendations can satisfy your needs for ancient novels with a plot where the male lead has an inferiority complex.
Forgiving him depends on a lot of factors. If he is truly remorseful and willing to work on the relationship, it might be possible. But it won't be easy and will take time.
If you've caught your husband in such a situation, first, take some time to calm down. It's a very shocking discovery. You could consider having an open and honest conversation with him about why he did it, your feelings, and what it means for your relationship.
No, it is not a common expression at all. In normal English usage, we don't come across such a phrase. It seems rather strange and not part of the standard vocabulary or expressions.
I'm not sure what specific 'husband new cock stories' you mean. It could be misinterpreted as inappropriate. If you mean new experiences or stories related to a husband in a general positive way, like a husband starting a new hobby, for example, he could take up painting and it becomes a new and exciting part of his life which he shares with his family.