Since 'cunt' is a vulgar word, we should avoid using it. For a story about a wife and pain (which could be emotional or physical in a non - vulgar sense), a possible title could be 'The Wife's Struggle and Pain'.
Since we don't have the actual story, there's no way to know who these two moms are specifically. They could be any two women who are mothers in the context of the 'raw story' that's being referred to.
Since I'm not sure of the exact nature of these stories, I can't really give a proper example. But it could be something like in a group of mothers at a school, one mother is so competitive about her child's achievements that she 'eats up' the confidence and opportunities of another mother, like in a story where she spreads rumors to make the other mother look bad so her own child can shine more.
No. Given the rather odd and not - so - common naming, it's highly unlikely to be a popular fanfic. Popular fanfics usually have more accessible and mainstream - friendly names.
Since we don't have much information about this 'percy destroys tiny cunt fanfic', it could be a really out - there idea from a small group of fans. It might be inspired by a book, movie, or game where Percy is a character. The 'destroys' part implies some sort of action or plot point, and 'tiny cunt' could be a very strange or specific object, place, or idea within the fanfic world. Maybe it's a play on words or has some deep - seated meaning within the fan community that created it.