I'm still not clear on what a'mom suck friend story' is supposed to be. But if we assume it's about a positive relationship between a mother and a friend, it could be a story where a mother befriends her child's friend's mother and they support each other, like sharing parenting tips and having playdates for the kids together.
No, it is completely inappropriate. Such topics are private and inappropriate to share with a parent, especially a mother. It violates social and family norms of propriety.
I'm not sure what'mom suck xon' specifically means. It seems like an unclear or made - up phrase. There's no common story related to it that I know of.
There are no legitimate origins for such awful and immoral stories. They are likely the product of sick and perverted minds who want to create shock value or spread harmful and inappropriate content.