I've seen this question pop up a lot for 'She's Mine to Claim'. Straight talk: those 'free PDF download' sites are almost always illegal. They distribute copyrighted material without the author or publisher's permission. It's piracy.
What really grinds my gears is how this hurts authors, especially in the indie or serialized fiction space where a lot of these stories live. Every illegal download is a direct hit to their income, which can determine if they get to keep writing. The legal route isn't hard—many platforms like GoodNovel, WebNovel, or the author's Patreon offer official, often free, ways to read chapters through ad-supported models or freemium systems. The PDFs on sketchy sites are also notorious for malware, terrible formatting, and missing chapters.
If you loved the story, supporting the official release is the only decent way to ensure you get more of it.