I get why you want a straight path to the legal copies — I love supporting creators, too. If you want to read 'Playing With The Billionaire' online without sneaking around, start with the big ebook shops: Amazon Kindle, Apple Books, Google Play Books, Kobo, and Barnes & Noble's Nook store. Those stores often carry licensed ebooks or have links to the publisher's edition, and sometimes titles show up on Kindle Unlimited or subscription services for short periods.
If it's a serialized web novel or comic, check official serialization platforms like Webnovel, Tapas, Webtoon, Tappytoon, Lezhin, or MangaPlus — many series that began online end up hosted there legally. For libraries, try OverDrive/Libby or Hoopla; I’ve borrowed romance serials that way and it’s a great no-cost legal option. Finally, Scribd and subscription ebook services sometimes have licensed copies, and Bookshop.org will point you to buy physical copies while supporting indie bookstores. I usually cross-check a couple of those places and feel better knowing the author is getting paid.