The Perfect Poo: A Fiery Fecal Romance by M.J. Edwards
I got this as a freebie through Kindle Unlimited. It made sense to me up until about halfway through. I thought that was the end. Oh, noooo, it got weird. Then weirder. Then it started to almost make sense again. And then strange again.
I don't know that I would recommend this to anyone, but after the first half of the book, I was invested. I needed to finish it.