So I been looking for awhile now for a stor series where the protagonist, she is unable to afford to pay to go to the convention with her friends but she volunteers to be a subject at the convention, on day one she is used as a table at the opening ceremony thing, the 2nd day she is turned into a pooltoy and I forget the rest
The story you're referring to is called 'Hope Floats' by Nate Wallis. Chapter 1 is called 'Table Service' and chapter two is called Pool Toy'. It's one of my favorites.
https://www.latexstories.net/storiesek/hopefloats.html
https://www.latexstories.net/storiesek/hopefloats2.html
https://www.latexstories.net/storiesek/hopefloats3.html
I wrote a story from a different perspective, Titled 'Unconventional'. You might find it interesting.