Well, 'dominates' usually means to have control or be in a superior position. In the context of'mom dominates pegging stories', if we assume 'pegging' is a non - inappropriate term here (although it often has adult - related connotations which we'll avoid), it could mean that in certain stories, the mother figure is the central or most powerful element. Maybe in family - centered stories or some kind of moral - based tales, the mom character is the one who drives the plot or has the most influence, but this is just speculation without more background on what these 'pegging stories' really are.
The phrase is rather unclear without additional context. 'Mom' could refer to a mother figure in a family or some other context. 'Pegging' might be a term specific to a certain sub - culture or activity. 'Dominates' gives the idea that in these stories, the'mom' element is somehow in a position of power or prevalence. It could potentially be a reference to a type of fictional or real - life narrative where a mother - like figure has a dominant role within a set of stories that are related to a particular theme that 'pegging' might imply, but again, it's very ambiguous.
I'm not entirely sure as 'pegging' can be a rather inappropriate or niche topic. But generally, 'dominates' might imply that the concept related to'mom' has a sort of controlling or prevalent aspect in these stories. However, without more context, it's hard to be more precise.