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They claimed me. Then they bred me.

By the time these alpha shifters surrounded me, their breath hot on my sweat-slicked body as they stripped me bare, I'd already tried fleeing and I'd already done my best to fight them off.

So as these brutes take turns mounting and rutting me like feral beasts, all I get to decide is whether to take every drop of their seed like a good girl or take them all at once with my ass spanked red like a bad girl.

Because I'm their mate.

And one way or another they're going to breed me.

Publisher's  Feral Mates is the first book in the Ruthless Instinct series but can be read as a standalone. It includes spankings and rough, intense sexual scenes. If such material offends you, please don't buy this book.

416 pages, Kindle Edition

Published October 2, 2025

446 people are currently reading
59 people want to read

About the author

Piper Stone

219 books1,299 followers

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5 stars
78 (53%)
4 stars
32 (21%)
3 stars
26 (17%)
2 stars
10 (6%)
1 star
1 (<1%)
Displaying 1 - 30 of 36 reviews
Profile Image for Athanasia ♥︎ .
390 reviews28 followers
September 30, 2025
It was hard to actually rate this book because the writing itself was not that bad, but rather the structure did it a disservice.
It appears that the author divided the story into three parts:

1st part—sex, which consists of the 2-3 orgies that feel way too CNC.

2nd part—some plot and some more orgies.

3rd part—trying to conclude the story.

instead of trying to blend the story and see the relationship flourishing through the hardship. As a result, the writing was strangely hard to read and at times boring. The "romance" was nonexistent, as these men had the emotional capacity of an angry chihuahua, and the spice occasionally felt like a biologically infused rape. The "action" part would have been more intriguing if I actually cared about the characters.


Tags:
Paranormal MMCs🧛‍♂️🧞‍♂️ 🧜‍♂️
Reverse harem/MMFM
Poly Relationship 👁👅👁
Insta love-matehood❤️‍🔥 ❤️
Heats/Ruts🥵 🥴👋
Orgies🎀 🎉⭕️
Interesting Anatomy👀✨🥵
Primal play 🥵🔞✨
Miscommunication😵‍💫⚠️
Angst😐😑😬
Dirty talk😈🎇🗣
Unprotected $e)(😵‍💫😈
Possessive MMCs💞 💓 💗
Explicit Content 👀✨😈
Dystopian 💉 🩸🪒
Size difference 😲😵🥵
Discrimination😐 😑 😬
Violence 🛑 ⛔️ 📛
Morally grey characters 👤 👥🗣
Murders 🧨🧫 🧪
War themes/vendetta 🔫 💣 🪒
HEA🌠 🎇 🎆
441 reviews
September 24, 2025
The start of a new series of standalone dark shifter romances, Ruthless Instinct, Feral Mates. Savannah, a research scientist at Blackwell Industries, has an unfortunate accident in the middle of the forest late at night when she came upon three naked men. So, she runs! And has the most intense steam between her and the three men. When she wakes up on the forest floor, she’s convinced herself that it was all a fever dream. Until she sees an article about the Serenity Wildlife Refuge. Apollo, Kai, and Roman have all been tested on by James Wheeler, a demented scientist. After escaping they latched on to Savannah’s scent. Mate! This was an intense read by Stone, she’s so versatile in what she writes. The characters are great and the spice was spicy! I’ll be patiently waiting for Savage Mates to read about the next group of mates!.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
3,133 reviews
September 10, 2025
Simply wonderful read, wonderful characters and shifter romance that has riveted from start to finish
A simply captivating read as we follow the scientist Savannah that is working in a laboratory that has been testing the possibility of cells changing Ing when exposed to very specific conditions but up until now she has not found any positive confirmation.
Then one night on the way home she had been unfortunate enough to have a puncture as she was driving through the woods, as she endeavoured to change the spare, she had three men all naked make their way out of the woods. had been completely horrified and had run as far and as fast as she could and had unfortunately been captured and then had been passionately and wildly used by each of the men before they had left her in the woods at daybreak.
Roman, Apollo and Kai are surprising able to provide the name of one of the scientists from the place they have been being held and tested on and that is James Wheeler, she is horrified as this is one of the scientists that are believed to be working for her company on the secret Portal experiment she is not supposed to know about.
As the three men meet up with Savannah who they now are certain is their mate and once again they feel the need to watch over her as they know she is employed at the laboratory they know has been holding them prisoner and carrying out all kinds of unknown tests on them.
I know that you will be captivated by the intrigue and the risks that each of them has taken to look after their mate and to discover what has been happening at Savannah’s lab. It is obvious that there is some very strange things happening and they are all to do with the portal that is supposed to be a closely guarded secret but it seems has obviously previously drawn unwanted attention on previous occurrences.
I thoroughly enjoyed the book and look forward to reading any future publications; keep up all the wonderful writing.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
487 reviews4 followers
November 4, 2025
Feral Mates
A Dark Wolf Shifter Romance (Ruthless Instinct, Book 1)

By: Piper Stone
Narrated by: Skyler Morgan

So Different, So Good, I Loved it ALL!

Overall: 5 of 5 stars Performance: 5 of 5 stars Story: 5 of 5 stars
Reviewed: 11-3-2025

Savannah, a dedicated research scientist, thought her work at Blackwell Industries was moving mankind forward … until she met Kai, Apollo, and Roman! Clearly someone has some serious explaining to do … assuming she lives long enough to hear the answers … “Feral Mates” hawt, engrossing, stunningly thought provoking, and SO very DIFFERENT from any other shifter story I’ve experienced! From the amazingly well designed, meticulously defined characters, to the smooth flowing cohesive storyline - “Feral Mates” is perfection! The shifter “science” behind the story is delightfully different AND beautifully explained! Throughly delighted, I found myself hanging on every perfectly timed, perfectly emoted, sultry smooth word! This emotional, thought provoking, hawt as blazes story is an absolute win in every single category! Five fantastic stars! I LOVED it!
961 reviews4 followers
September 11, 2025
A exciting and different read where science meets shifters. Savannah, a scientist, discovers that more is going on than meets the eye at the laboratory where she works. When an encounter with three wolf shifters, Kai, Roman and Apollo, leaves her wanting more, her discovery puts her in danger as well as them. On the run they find themselves at the mercy of a man who is truly evil and thinks he is invincible and wishes to take advantage of the connection that Savannah has, not only with the wolves, but the new life forms that have been discovered, to create something more. Something that Savannah and her wolves will die, if necessary, to stop. This very hot and steamy read has so many twists and turns, drama and suspense and every page will leave you on the edge of your seat as you read it. This book is something else and I loved the slight twist at the end.
918 reviews3 followers
September 13, 2025
Not Bad!

I want to explain that I'm not much for shifter story's or werewolf, sorry! But being a Piper Stone I had to try and it wasn't bad,not gorey.Kia,Roman and Apolo were werewolves that were captured by Dr.Blackwell and was tested like test tube rats,they escaped but came across Savanah or Dr.Morgan who had a heart for animals especially for the ones who were captured and tortured. Savanah knew something was wrong when she went to work one morning and notice some of work wasn't right and after that her life wasn't the same,she felt like she was being watched.She did fine out what Dr.Blackwell was doing and if he kept up it would change the world.This has heat,filled with lies and secrets and compassion, please read and make your own opinion,but enjoy I did.
Profile Image for Toni.
2,354 reviews24 followers
September 18, 2025
Savannah is a research scientist and working on a project that is being stubborn. She heads home only to get a flat tire. As she's replacing it she hears sounds then sees yellowish eyes. What follows that night is like a page out of a pnr story.
Apollo,Kai and Roman are wolves but they were captured and turned into something more. They all know this female is theirs.
As she starts to add insights together a picture emerges. Then she learns her wolves are in danger.
The hunt is on for her wolves while her hunt for the truth starts.
Will the four manage to survive whatever nefarious scheme is in motion?
A story that grabs the reader's interest and as the story unfold keeps it. The suspense is heightened and the reader is as much invested in the truth as Savannah is!.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Susan Cox.
650 reviews6 followers
September 18, 2025
Alphas, Wolves, Aliens

Whoa, this is a wild read. Piper packed it full of hot and wild adventure. Savannah is a workaholic scientist at a top-secret type of research facility. Her laser project may finally be working. She leaves for the night dead tried but still wound up. She gets a flat tire, just what she needed. Suddenly the night is spooky and filled with yellow eyes staring at her. What are they? Who are they? Her mind is in hyper drive. Are they connected to the portal? She is running from them, but she can’t seem to escape. There are too many questions...they’re wolves? Giant wolves. They say she is theirs. But how can that be? What happens after they catch her is hot, rough and wild. Please check the trigger warnings before reading.
186 reviews
September 21, 2025
Unique wolf shifter story

Spice was 3.5/5 warning beasts driven to claim no consent yet our fmc wants them and says so in her Internal dialogue, it's still fairly graphic.
This was a science, parallel universe wolf shifter book unique explanation of how shifters come about.
The sex was great, intense primal...breed kink.
You also have the main storyline humans are the real cruel animals, science, greed playing God...that kept the story moving adding in the fighting to survive parts, well balanced but I came for the smut and was pleased.
Unsure if the second book is their story continued or not. The
This has an epilogue, were unsure if the bad guy was truly killed and the epilogue makes it seem there is more to come.
Book was great. Worth the read.
687 reviews6 followers
September 26, 2025
Feral Mates is the first book in the Ruthless Instinct series but can be read as a standalone. This shifter story is different. Savannah, a scientist, gets a flat tire leaving work one night. She's in the middle of nowhere. When she gets out of the car, three large naked men approach her. She runs into the forest to get away. They are convinced that she is their mate. She wakes up in the forest and thought it was all a dream. A very SEXY dream. Nothing is the same after that. Her work has been tampered with at work. She feels like she's being watched. The situation gets dangerous. Very interesting storyline. Hard to put down.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
3,129 reviews47 followers
November 13, 2025
Brilliant narration from Skyler Morgan, who brings the emotions, drama, angst and spice to your ears.


Savannah, is a research scientist at Blackwell Industries. While having to go into the local forest one night Savannah comes across three naked men. What can a woman do but run but before there is a spice and spice. When Savannah wakes up on the forest floor, she details herself it was all a dream. That is until she sees an article about the Serenity Wildlife Refuge. Apollo, Kai, and Roman have all been tested on by James Wheeler, an off the wall and lets say insane scientist. The three wolf shifters escape and find Savannah’ scent and know that she is their mate.

Ohh the drama, action, and hot spice.
Profile Image for Mrs Reads Between The Lines.
200 reviews1 follower
September 10, 2025
Out of context quote:

“Mmm…” The single syllable he whispered was dark, vibrating against my skin.

Feral Mates is a twist on what is normally thought of in the shifter romance genre. Think sci-fi meets wolves meets humans with a dash of an evil vampire! Although sci-fi is not normally a genre I enjoy, Piper found a way to make it fun!

If you’re like me and sci-fi is not your thing, I’d still recommend giving this one a try. It might surprise you!

9/10 would recommend.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
1,948 reviews18 followers
September 12, 2025
Rating 4.5
I loved this story because it has a unique twist on shifters that was different from anything I have ever read which caught my attention at the very beginning. The main characters in this story Roman, Kai, Apollo and Savannah are devoted to each other in a unique way. The story is well written and presented in a way that was entertaining. I thought the ending added a bit of mystery to the story. It’s different and definitely worth reading.
I received a free copy of this book via Booksprout
and are voluntarily leaving a review.
Profile Image for Kimberly.
521 reviews13 followers
September 21, 2025
Wild, Dark, and Addictive
Piper Stone brings the heat and danger in Feral Mates. This dark wolf shifter romance is packed with intensity—gritty world-building, explosive chemistry, and just the right amount of bite. The characters are fierce and passionate, with enough tension and twists to keep the pages flying. If you love shifter stories with a darker edge and plenty of steam, this one will have you hooked from start to finish.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for SJ.
669 reviews10 followers
September 23, 2025
Three. Savage. Men.

Book 1 of Ruthless Instinct

I don't think there's any genre Piper Stone can write that I won't immediately be all over and devour. I LOVED this dark wolf shifter romance. It was a thrilling paranormal romance full of heart-pounding action and extra spicy why-choose heat. With three sexy alpha wolf shifters that had me melting from the heat and an amazing FMC, I ate this book up.

Explosive. Carnal. Primal.

Tropes:
Wolf shifters
Why choose
Paranormal thriller
Explicit
Kink
BA FMC
Stalker
Capture
Dub-con
Possesive
Touch her and ☠️
Multiple POV

Check TW
Profile Image for Leanne Bryson.
5,168 reviews22 followers
September 23, 2025
Savannah, a driven scientist at a secretive research facility, is exhausted but exhilarated by progress on her laser project. Leaving late, a flat tire strands her on a spooky night, where glowing yellow eyes—giant wolves—surround her. Panicked, she questions if they’re linked to her lab’s portal. Unable to escape, she’s caught by Roman, Kai, and Apollo, who claim she’s theirs. Their encounter is intense, primal, and wild. Check trigger warnings before reading. 4.5 stars from me

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
912 reviews1 follower
September 24, 2025
There's something so captivating about how this unfolds. Savannah initially runs from Apollo, Kai and Roman until they impress upon her their desire to mate. Along the way she discovers that they might be part of a conspiracy that she's investigating at work, putting herself in danger. With their help and their burgeoning relationship can they keep her from danger. Loved the storyline and world building. It's hot and steamy as well as full of danger and adventure. Bravo!.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Lisa A.
1,518 reviews13 followers
September 12, 2025
A unique and exciting shifter romance…
Savannah, a scientist on a controversial project, runs into trouble leaving work late one night. Afterwards, she has trouble believing the encounter really happened until she once again crosses paths with alpha wolves Apollo, Kai, and Roman. Her efforts to understand the complex dynamics draw unwanted attention from dark dangerous sources… I received a free copy of this book. This review was posted voluntarily.
1,401 reviews11 followers
September 13, 2025
Paranormal Shifter Read!

A fast-paced hot read, shifters and sci-fi mixed.

The storyline will keep you glued to every page as this entertaining and sizzling steamy read will take you on a roller-coaster ride of emotions.

This is a different take on a shifter read with lots of action and a satisfying HEA with a twist at the end.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for ltfrom bc.
537 reviews5 followers
September 16, 2025
There are many romances out there that have shifters and fated mate, but this is the first one that had a different story line as to how shifters came to be. This was really quite refreshing and enjoyable. It is an extremely fast paced story. It is non-stop action from the beginning right through to the end. There is lots of hot and steamy moments. Also lots of nail-biting suspense and danger. Such a good story line and I am excited to read whatever is next in this series.
Profile Image for Ruth.
485 reviews10 followers
September 24, 2025
Dr Savannah Morgan is working on a project in a laboratory, unknowingly in another part of the building there are unauthorized secret testing going on by the owner. Going home one night, she has a flat tire and feels like she is being watched. Seeing eyes staring at her from the forest she runs and is chased by three naked men. Love the steam, danger and surprises!

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
1,855 reviews23 followers
September 30, 2025
Savannah has opened a door into a world even she did not imagine. The alpha wolf shifters' have their eyes on her and are about to claim her. Will Savannah be putting this discovery in her notes? A good paranormal read.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for L KQ.
5,472 reviews21 followers
October 7, 2025
Weave of Emotions

A complicated weave of emotions, drama, and suspense, this story is exciting and heartpounding. Something shifty is going on, and the appearance of three handsome but animalistic men only ups the ante in this intense read. I could not put it down.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
1,733 reviews11 followers
September 16, 2025
Stonking

A cracking read from piper Stone, great characters and a well written story. Plot to maintain interest and lost of adults only romance.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
826 reviews2 followers
September 21, 2025
Experiments
Piper Stone does it again with this other-worldly shifter tale and the scientist involved. Savannah knows there’s something happening with the Portal but has no idea it will release three, hot, sinfully sexy and demanding Alpha males who are also wolves! And her mates!!
56 reviews
September 25, 2025
Wow love Feral Mates

This book I live the story the suspense to now how it was at the end I read it in 2 days it was so good love this book what to read more of Piper books thanks.
2,213 reviews
September 25, 2025
Savannah is found three werewolf shifters (Apollo, Kai and Roman), who claim her as their mate. But there is drama around them and things are not quite as they seem. A steamy, spanking, dark read.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for MsRoman.
1,131 reviews4 followers
October 7, 2025
Feral Mates: A Dark Wolf Shifter Romance (Ruthless Instinct Book 1) By: Piper Stone. Savannah comes across the unspoken and yet these delicious creatures are victims themselves. I still do not understand how Blackwell can be such a monster . loved this story
645 reviews
December 8, 2025
The description is misleading.

I almost skipped these books because stories that focus on breeding and/or pregnancy are not my thing. This is much more a paranormal thriller than it is about fated mates and breeding. There is also a unique take on the origin of shifters.
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