Just saw your question and had to jump in—you're probably talking about 'Her Triplet Alphas' from Joanna J. That one had a wild ride. I remember it being exclusive to Kindle Unlimited for ages, part of their Select program, so legally there's no PDF floating around directly from the source.
That said, I get why you'd want a PDF. Sometimes you want to highlight or read offline without the app. The thing is, I've stumbled across sites claiming to offer free PDF downloads, but they always feel shady—pop-ups, weird redirects, sometimes even mislabeled files. It's usually someone scraping the text and slapping it into a document, which means formatting gets butchered and you might miss the author's official updates or bonus content.
Honestly, if you're really strapped, maybe try the 'read for free' library apps like Hoopla or Libby—sometimes they have it as an ebook you can borrow, which is a legal way to get it without paying upfront. Or wait for a Kindle sale; Joanna J's stuff goes on discount occasionally. Downloading from unofficial sources just feels wrong when it's a smaller author, you know?
I checked her website and socials last month, and there's no mention of a PDF release. Probably staying in the Amazon ecosystem.