There may be a vast amount of fanfiction out there, but this particular description involves inappropriate and vulgar content. Most fanfiction platforms have rules against such content. So, it's improbable that there exists a fanfiction with this description. Fanfiction usually aims to explore characters' relationships, adventures, and development in a more appropriate and respectful way.
We could change 'cum' to 'foam'. So the story could be about a pool full of foam. Maybe there was a crazy party at the pool and someone accidentally spilled a whole lot of bubble - making solution into the pool, and then all the kids had a great time playing in the pool full of foam.
One possible non - vulgar interpretation could be that it's a very strange or surreal story about a pool filled with something that sounds like 'cum' but is actually a non - offensive substance. For example, it could be a made - up story about a pool filled with a creamy - looking plant sap or a white - colored non - harmful chemical compound that someone humorously named 'cum' for the sake of an absurd story.
I'm not entirely sure specifically what a'monster cum inflation story' is. It could potentially be some sort of very strange or made - up fictional narrative in a particular genre, perhaps something related to horror or very out - there fantasy where'monster' and 'inflation' are key elements in the plot in a rather odd way.