Imagine a party where four slutty milfs are standing before a small audience.
(It could also be filmed as a game show)
The moms would have several slutty competitions - for instance birthday candles are attached to a rope spaced out about six inches. One for each of their kids ages. So if they have two kids 16 years old, that's 32 candles.
The woman must dance across the rope with their naked pussy and extinguish each candle. The one who has the fewest remaining is the winner -ties for first place result in extending the competition.
In between each physical competition, a short story is written as a confession from the mum about their debauched lifestyle - and what makes them the Best (Worst) Mum in all of the UK.
At the, end the winner is announced based on judges scores for the confession and their competitions, and they become the focus of a huge gangbang and win a large sum of prize money. The losers get nothing.
The question as an author would be what would make each of the women unique/interesting.
nothing about abuse would be permitted in the story, these are kinky/slutty/skanky slappers -not moms that abandon or abuse.