Okay, so I was in this exact spot last month, craving some shifter drama but not wanting to clog up my phone with downloads. Honestly, the secret weapon is your local library's digital service, like Libby or Hoopla. They have partnerships with major publishers, so you can borrow ebooks or even audiobooks legally for free. Just use your library card number to sign in. The selection can be hit or miss depending on your library, but I've found some solid paranormal romance series there.
Another angle is looking directly at author or publisher websites. Some authors, especially those self-publishing on platforms like Kindle Unlimited, will put the first book of a series up for free permanently to hook readers. You'd be reading in your browser through Amazon's Cloud Reader, no download required. RoyalRoad is also a massive site for serialized web novels; you can filter by the Werewolf tag and read tons of ongoing stories directly on the site. The quality varies wildly from amateur to absolutely gripping, but it's all right there, chapter by chapter.