Theirs to Possess: The Marriage Claim

by Sierra Cartwright

A wedding dress. A contract. A lie. Now two ruthless billionaires own a bride who was never meant to be theirs...

I’m the devil Houston society whispers about—the man with too much money, too much power, and zero patience for liars.

I was supposed to marry her sister.

A calculated transaction, sealed with a contract and a carefully curated smile. But when the woman walking down the aisle isn’t the one I bargained for, I don’t stop the wedding.

I see an opportunity.

Isla Davenport is soft, bookish, untouched—and now mine.
A pawn in her family’s dangerous game, handed over to settle their debts and clean their sins. But they didn’t count on me wanting to keep her.

Or my business partner, Brennan, the criminal with blood on his hands and loyalty only to me.

She thought she could survive one ruthless billionaire.

Now she’s all we hunger for—innocent, defiant, dangerously irresistible. We’ll crush anyone who dares challenge our claim.



Theirs to Possess is a dark, sinful standalone in the Titans secret society world. It features two obsessed, controlling billionaires, a forced marriage, a runaway sister, a morally gray antihero, an actual criminal, age gap, innocent heroine, forced proximity, and the ultimate possessive "touch her and die" energy.

Because when we say “I do,” it’s forever.

Genres: BDSM, Billionaire Romance, Menage, M F M

492 pages, Kindle Edition

Published September 30, 2025

About the author

Sierra is a USA Today, International Best-Selling author who wrote her first book at age nine and hasn't stopped since.
Sierra invites you to share the complex journey of love and desire, of surrender and commitment.
Her own journey has taught her that trusting takes guts and courage, and her work is a celebration for everyone who is willing to take that risk.

Reviews

[Cécile Smits · Rating 4 out of 5]

Sierra Cartwright’s Titans is a wonderful world,with delicious men,and the beautiful women they fall for.
Each story i’ve read was delicious,and i enjoyed every single one i’ve read so far.
This time,i decided to share how i felt,and why.


Theirs to Possess tells the story of Isla,who’s forced by her father to take her sister’s place in marrying Dorian Vale.
Marqaux fled because she found out things about their father,bad things.
And she knew Dorian wasn’t a good man,nor was the man who was always by his side,his best friend,Brennan.
She didn’t know their father would simply replace her with her sister,though….
Isla thought she’d made it,she’d walked away from everything her father had put her through since childhood.
He may have kept her trustfund from her,but she got her PhD in liturature on her own strenght.
She had the job she wanted,and loved.
And now she saw it all fall apart…..because Dorian needed a wife to give him a sense of respectability as he ran for the job of Senator of Texas.
And that wasn’t the only bomb that was dropped….no,he was going to share her with Brennan.
Dorian didn’t care which sister he got,he just needed to get married.
But Isla surprised him,and Brennan,and she kept surprising them.
She may have been a virgin,but she wasn’t meek.
She may have been innocent,but she wasn’t stupid.
And he feared she might start to mean more to him,and Brennan,then he’d thought.
But Dorian and Brennan have secrets,and even though Isla wants their honesty,they’re not ready to share…..

A wonderful story that shows what’s important in life.
Spoiler alert,it’s not money,nor is it power.
It’s caring,sharing,trusting and being honest with the ones you love.
And Isla,Dorian and Brennan learned that lesson must in time.

[psych0_4books · Rating 4 out of 5]

The men and the spice?! Theirs to Possess was a sexy read with a few things that irritated me but overall it was a great read.

Isla Davenport is forced to marry her sister's fiance and enters a world far away from her simple life as a literature grad student and teacher. Her spouse, Dorian Vale, is an imposing force and determined to bend her to his will and mold her into the perfect wife as he pursues a seat on the US Senate. Brennan Weston is Dorian's best friend and bodyguard who also happens to share *everything* with Dorian, which Isla is equally unnerved and excited about.

The plot doesn't pick up until around the middle of the book and the spicy moments are hot but I was turned off by Dorian's controlling behavior outside of the bedroom. Isla grows into her strength eventually and when she finally stands up to her men, I snapped my fingers in salute.

The end was okay but it was like a quick mention of the aspirations of the trio and their associates. I wish there was more plot or depth to the story and less spice. I did appreciate the growth of the three main characters.

[Nicole · Rating 5 out of 5]

Theirs to Possess is the sixth book in the Titans Captivated Series. A dark, sinful standalone in the Titans secret society world. It features two obsessed, controlling billionaires, a forced marriage, a runaway sister, a morally gray antihero, an actual criminal, age gap, innocent heroine, and the ultimate possessive "touch her and die" energy. This Isla, Brennan and Dorian's story which is told from multiple point of view. Captivating. Decadent. Sinful. Dirty. Filthy. Raunchy. Smutty. Twisted. A beautifully written story with complex individuals and a twisty and fascinating storyline that captures the reader attention from the beginning and keeps you riveted and on the edge of your seat and turning the pages until the end. A fast paced, thrilling, tantalizing and spicy story. Immerse yourself in this mesmerizing rollercoaster ride filled with secrecy, revenge, suspense, mystery, and deception. An unputdownable and absorbing read.
A bodygyard romance, billionaire romance, contemporary romance, touch-her-and-die romance, protective alpha hero romance, morally-grey antihero romance, OTT alpha hero story, forced proximity romance, why-choose romance, polyamory romance, dark romance, virgin heroine romance, lust-at-first-sight romance, insta-love romance, insta-everything romance, they-fall-first romance, aged gap trope romance, taboo romance, MFM romance mafia romance, crime thriller story, romantic suspense story, with action, lies, sex and sin, submission, consensual intense rough sex, dominance, dirty talking, revelations, power and control, murder, bloodshed, fear, drama, possessiveness, obsession, family issues, betrayal, pawn, corruption, threats, resilience, survival, and love.
Isla Davenport older sister had an arranged marriage set up by their dirty and corrupt father whose a sitting judge with Dorian Vale. However, her sister bail on the arrangement before the ceremony and her dad had to come up with on alternate plan because he was also getting something out of the arrangement. He didn't tell Dorian that his intended bride had fled and that her sister Isla would be taking her place down the aisle.
Dorian was in shock when he unveiled his bride at the alter and realized that she wasn't the woman that he was promised but he wasn't disappointed with it either, in fact he preferred it this way and found that he was very attracted to her. Isla is a nerdy college professor who stay away from her influential family and their power moves. She's being forced into a marriage that she doesn't want any part of but her dad didn't give her any option. Isla as heard rumors around town about the powerful and ruthless Dorian Vale and his illegal criminal activities.
Dorian as his eyes set on becoming a Senator and with her dad's connections and Isla coming from an influential family it helps his chances of winning. Isla knew that she was getting married to Dorian but what she didn't know was that she would cared between him and his bodygyard and partner Brennan who shares everything together. This took her for a loop, but she also felt attracted to both men which was surprising and unnerving. They started their world winding relationship and she found that she was glad to Brennan was apart of the deal, since Dorian was distant and self serving at times while Brennan was always there and very attentive to her needs. Dorian was surprised that Isla actually wants to be a wife once she got settled into the relationship. Their power dynamics was hot and three practically burn up the sheets.

I received an advanced copy of this book via Booksprout and I am voluntarily leaving a review.

[Susan · Rating 5 out of 5]

A wedding dress. A contract. A lie. Now two ruthless billionaires own a bride who was never meant to be theirs...

I’m the devil Houston society whispers about—the man with too much money, too much power, and zero patience for liars.

I was supposed to marry her sister.

A calculated transaction, sealed with a contract and a carefully curated smile. But when the woman walking down the aisle isn’t the one I bargained for, I don’t stop the wedding.

I see an opportunity.

Isla Davenport is soft, bookish, untouched—and now mine.
A pawn in her family’s dangerous game, handed over to settle their debts and clean their sins. But they didn’t count on me wanting to keep her.

Or my business partner, Brennan, the criminal with blood on his hands and loyalty only to me.

She thought she could survive one ruthless billionaire.

Now she’s all we hunger for—innocent, defiant, dangerously irresistible. We’ll crush anyone who dares challenge our claim.

This contemporary billionaire dark, sinful standalone age-gap romance is page-turning with exceptional world-building and characters that are a morally gray antihero/actual criminal, an innocent heroine who is defiant, innocent, and dangerously irresistible, who are both captivating, and resilient. Their journey is enthralling with theirs to possess, a wedding dress, a contract, a lie, two ruthless billionaires own a bride who was never meant to be theirs, the marriage claim, mature, explicit romance that is consumed by steamy, sizzling passion, lust, desire, and spice, with all the feelings to leave readers breathless and begging for more, forced proximity, the ultimate possessive "touch her and die" energy, a forced marriage, a runaway sister, two obsessed controlling ruthless billionaires, chaos/drama, suspense that will leave readers on the edge of their seats, heartfelt emotions/emotional depth, action, adventure, and more. I recommend reading this book by an extraordinary author who knows how to captivate her readers' hearts and attention with theirs to possess the marriage claim and a mature, explicit romance that is sure to transport readers into a world that is wildly lustful, and unforgettable.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Michelle Frater · Rating 4 out of 5]

Secrets—so many secrets. Why do men always think keeping women in the dark will somehow keep them safe, when the truth is the only thing that truly could? But in Isla’s case, it’s not the danger that breaks her. But let’s rewind for a moment. Isla was never supposed to marry Dorian Vale. That honor (or curse?) was meant for her sister, who had the good sense to run. You’d think a man as ruthless and seemingly perceptive as Dorian would notice something was off—say, a wedding dress clearly designed for a curvier bride. Yet when the switch was discovered, Dorian was floored by Isla’s desperate plea to continue the ceremony. Poor Isla, she had everything heaped on her at once. Not only forced to marry Dorian by her father, but then finding out he came as a package deal, yet she never dissolves into a weepy mess (well, not the despairing kind, anyway). Despite her inexperience, she adjusts to her new poly life surprisingly quickly (maybe a bit too quickly?) but her strength and adaptability kept me rooting for her the whole time. I loved how Dorian and Brennan treated Isla as something precious, even while insisting love wasn’t part of the equation. Still, the shadows between them lingered; those nagging secrets that Isla couldn’t ignore. Dorian and Brennan were fascinating, if a little familiar in their archetypes. Dorian is the quintessential stoic alpha—control-freak tendencies, emotional walls thicker than castle gates. Getting him to open up was like squeezing blood from a stone. Brennan, on the other hand, was the soft center to Dorian’s hard edge—gentler, more emotionally tuned, even taking care of Isla’s cat, Calypso (major points there). Their triad dynamic was emotionally charged, full of push and pull, tenderness and tension. And when the final puzzle piece of Dorian and Brennan’s shared past clicks into place, it changes everything. The real question becomes: can Dorian finally let down his walls and risk vulnerability or will his silence cost him both Isla and Brennan? A gripping, passionate read full of secrets, drama, and slow-burning tension.
I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Mary Lynne · Rating 2 out of 5]

Theirs to Possess has all the hallmarks of a Cartwright read—incredible sensuality and interesting characters—but it didn’t gel for me. The premise is that a potential senatorial candidate (and shady businessman) is marrying an associate’s daughter in a kind of arranged marriage, but the bride bails on the day of the wedding and her sister is forced to take her place. Then this new bride finds out she’s entered a triad. Talk about a lot to work through!

But a lot didn’t make sense to me. I couldn’t see why someone who was planning to run for senator would just accept a substitute bride at the altar. Wouldn’t people talk about that? Wouldn’t that come up when he would make a bid for a very public office? That same question arose in my mind when Dorian introduces Isla to Brennan, his bodyguard who’s also the man he’s shared his women with. Wouldn’t this kind of arrangement be hard to hide in public office?

Aside from the public aspect, I struggled with the relationship between these three. Dorian was marrying his fiancée to create a good public image, but then he meets Isla and he’s OK with the substitution, which seemed odd. And Isla goes along with Dorian and Brennan easily, which just confounded me. I expected a lot more resistance from her than I got. Brennan is pretty much a brick for putting up with all of Dorian’s shenanigans.

This leads to a very, very long sequence where these three are getting it on in practically every way imaginable. Again, Cartwright is a master of steamy scenes. But I honestly got bored and started skimming when they happened again and again with very little plot advancement. This book could have lost 100 pages easily and not hurt the overarching story.

Isla is also supposed to be a college professor. But she leaves her job with literally no notice and disappears into her love nest for weeks and then can just—return to her job? That made no sense to me. A professor who disappeared mid-semester would probably be fired. It’s like her job appeared when it was convenient for the plot.

So this was a disappointment for me from an author whose books I love. I’m hoping the next one comes back to form.

[ltfrom bc · Rating 5 out of 5]

Wow! The author really outdid herself with this book.
Imagine being forced at the last minute into an arranged marriage with a man that your sister was supposed to marry. Imagine finding out though, you are not married to one man but two. Imagine your entire life being flipped around to live in opulence with two very dominant men – men who share but also men who keep secrets from your and who keep their hearts closed. This is Isla’s story.
Forced at the last minute into walking down the aisle when her sister, the bride, ran away and eloped. Isla’s father, a corrupt judge and a very controlling and ruthless father, forces her to take her sister’s place. Before she knows it, she is standing in front of the alter saying ‘I do’ and promising to obey her new husband. When they leave the reception to begin the honeymoon, Isla is shocked beyond belief that she is also married to Dorian’s right-hand man and friend Dorian. Having never been with one man, it is a shock to find out she will spend her life with two. It does not take her body long to realize that she wants them both as they begin their marriage…a marriage comprised of two very dominant men, in the lifestyle, and one woman. Their honeymoon is everything you expect from a poly relationship. It is very hot, very steamy and with the right amount of dominance by these two very strong me. Isla, soon succumbs to their passions. But all is not well as she begins to learn that the men are keeping secrets from her about their past, that her father who is a judge is very corrupt and veiled threats are made. The more she learns the more questions she has. It is a house of cards about to tumble down. And as strong as Isla is showing herself to be, to herself and her husbands, she may not be able to stop it from crumbling.
This a very emotional story. There is a lot of passion between these three and a lot of secrets as well. I think this is the best of the Titans Captivated series so far. Well done.

[Theresa · Rating 4 out of 5]

Forced into a marriage by her father—with secrets of his own—to replace her sister who ran away the day of the wedding, Isla Davenport isn’t exactly a blushing bride. She’s a bookish, college professor who wants nothing to do with her influential family’s dealings. She’s certainly heard of Dorian Vale and his mysterious and certainly illegal background but only agreed to marry him out of obligation to her father. Dorian has aspirations about his future, and he needs the right woman by his side. Isla certainly wasn’t who he expected to see when he lifted her veil, but there was something about his new bride that captured his attention. Brennan, Dorian’s right-hand man, wasn’t unaffected by Isla either.

This is an irresistible, addictive read that showcases Sierra’s signature blend of dark romance and sizzling chemistry. The story grabs you from the very first page, weaving a tale of obsession, power, and emotional transformation that never lets up.

The dynamic between Dorian, the morally grey billionaire, Brennan, the fierce protector, and Isla, the woman they’re determined to claim is both intense and beautifully layered. The emotional stakes are high, and every twist feels earned, drawing you further into the decadent, secretive Titans universe Sierra has created. The story strikes a careful balance between steamy, provocative encounters and poignant moments of vulnerability, making it a standout in contemporary dark romance. There are all kinds of feels, and plenty of heat between this beautiful trio.

Theirs to Possess is an absolute must-read. It’s one of those rare romances where the emotional journey is every bit as compelling as the heat, offering an unforgettable reading experience without giving away any surprises.

[Kendra · Rating 4 out of 5]

I enjoyed this book; the concept was original and I fell in love with the characters pretty quickly. It starts off with Isla, being forced into a marriage to an intense, controlling, possessive man by her father. The wedding was originally supposed to be Dorian and her sister, but her sister ran away at the last minute, and Isla's father, being the bastard that he is, forced Isla to take her place. Dorian is intense and controlling, and it also turns out he is a package deal! Brennan is absolutely perfect - the best thing about these men and their dynamic is that they are perfect together - Brennan is the calm to Dorian's storm. The spice is perfection. The FMC, Isla, is relatable - a book nerd cat lover. She isn't by any means strong at first, but she also isn't weak. She is just..a typical, relatable person. Quiet. Dorian is arrogant, but also perfect. I fell for him and Brennan both almost instantly, even when Dorian was being a royal jerk. I enjoyed the fact that even though she was quiet, Isla still pushed back. Also, can I just say that the nickname "little one" kept me weak kneed. Isla is so inexperienced, and at first she isn't so sure how to feel about this whole possessive dominance thing, but I am totally here for it! Would happily take her place! lol. The story was captivating, the characters were as well. I do think the writing itself could be tightened in some places, but overall, it was a good read and I do recommend it.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Dee · Rating 5 out of 5]

Get comfortable with your bottle of wine, favorite snacks because you aren’t putting this one down until the last page has been turned. Isla has wanted to get away from her family for as long as she can remember but fate has other plans when her sister ran away from an arranged marriage her father a corrupt judge who is trying to run for senate with so many secrets has her stand in for her sister she isn’t anything more that a college professor, but a book worm and wants nothing to do with the illegal dealings her father or her family for that matter. Dorian sexy as all get out billionaire who planned this marriage right down to the signatures on the contracts but the women standing before him at the alter isn’t the one who signed the contract, and he isn’t stopping the wedding he will marry her she is payment for her family’s debt. Isla didn’t know what or why her father made her marry or why her sister didn’t honor the contract signed between the two of them, they have never included her in the family talks but now she is married to Dorian and his overprotective billionaire Brennan both feel like she belongs to them despite them working in a legally gray area but will she stand with them or fight them, will her corrupt father become senate like he plans or get what he deserves, will we get to see how some of our favorite Titans are doing, where did her sister run off to, and will our girl get her happiness?

[Rhonda Hicks · Rating 5 out of 5]

'Theirs to Possess' is an essential read. It’s one of those rare romances where the emotional journey packs just as much punch as the heat, delivering an unforgettable experience without giving away surprises.

Isla Davenport is thrust into a marriage to take her sister's place, all orchestrated by her father's hand. She recognizes herself as a bargaining chip, meant to keep her family safe. Unfortunately, her groom is far from the man of her dreams; Dorian Vale, shrouded in rumors and coldness, is ruthless and offers little appeal. To complicate matters further, his right-hand man, Brennan, is part of the package.

From the outset, Isla feels cornered, yet an unexpected attraction simmers beneath the surface. Picture her shock upon realizing that this marriage involves not just Dorian, but Brennan as well. As she explores her connections with both men, she feels a growing bond that only deepens over time. Isla becomes attuned to their protectiveness, even as Dorian's emotional shifts keep her on her toes while Brennan remains a steady presence.

She finds herself fiercely protective of her men in return. While the physical chemistry is palpable, their emotional connection evolves deliberately and powerfully. Cartwright crafts an intimate experience that leaves a lasting impression throughout the narrative.

[Jo-Ann Forrest · Rating 5 out of 5]

Steamy hot, edgy, suspenseful can best describe this next Titan story. Isla is forced into an arranged marriage when her sister ran away the night before the wedding. The groom Dorian Vale is surprised by the switch but also sees something else. His business is in the grey zone and he needs this wedding to the corrupt judge's daughter to make a run for the senate. This marriage is not what Isla thought it would be but with the help of Dorian and his bodyguard/other husband Brendan they will take her to the heights of seduction and open the doors to a world beyond words. However, when she learns about Dorian's past and her father's nefarious business dealings, Isla will question her place within this new family. You will have a few cameos of our famous Titans and it is always fun to see what they are up to. I was heart warmed by the way Isla was treated by her men and how much attention they have towards her and Calico. For me the best moment would be when her men come to terms with the realization, that their woman is strong and will move mountains with them together as one unit! Sierra Cartwright you did it again! Such a captivating, enthralling example of what people who come together can accomplish.

[Melinda Parker · Rating 5 out of 5]

Isla Davenport finds herself being forced into a marriage in place of her sister. All by her father’s hand. She’s not a blushing bride but she finds herself the bargaining chip to keep her family safe. Unfortunately, her groom is not the man of her dreams, but the opposite. Dorian Vale is surrounded by rumors, coldness, and men of questionable background. He’s ruthless and holds no appeal. In addition, it seems that his right hand man, Brennan, is part of the packaged deal.

From the beginning, Isla felt trapped. But she also felt an attraction, which unnerved her. Imagine her surprise when she realized that this marriage involved both Dorian and Brennan. What was even more surprising was the fact that she felt a connection to them both. Slowly, she felt their protectiveness as well. But it seemed Dorian ran hot and cold while Brennan was steady. And she liked them both.

All three had vulnerabilities, desires, and the need to make this work. Isla became as protective of her men as they were of her. While the physical awareness was evident, their emotional relationship developed slowly and firmly. Cartwright delivered an intimate experience.

[Susan Pezza · Rating 4 out of 5]

Isla is forced to walked down the aisle into a marriage that was supposed to her sister, but she's gone, she now it's Isla, but her groom doesn't know what's happened and her parents are hoping to pass her off as her sister. Isla doesn't want to get married to a man she doesn't know, but her father isn't giving her much choice and her sister is MIA.

Dorian Vale needs to marry to clean up his reputation so he can secure the Senate seat and marriage can do that. When there is a bride swap without his knowledge, he decides to continue with Isla as his new bride.

What Isla doesn't know, is the best man, Brennan and Dorian's business partner and bodyguard, will also be joining them for their honeymoon and in their marriage! Isla is a little thrown, but she doesn't have much choice. Brennan is the quiet one and gets along great with Isla's cat Calypso and she's grateful that Brennan is taking that step for her.

Great book! Loved seeing the three of them trying to figure out the new dynamic of their relationship and dealing with Dorian's Senate race.

ARC provided through Booksprout for my honest review.

[Beata Beatrix · Rating 1 out of 5]

I loved the blurb of this story, it helds so many promises for plot, character development, tension and progression of dark romance.
Unfortunately the story doesn't deliver the promise at all.
1. An unexperienced virgin FMC which goes straight for hardcore submissive on her wedding night? Totally unbeliveable for me.
2. Both males, big bad mafia guys, falling in love, depth of devotion and whole protection mode after simply after 1 night of s*x? Yhmmm nope.
3. Both guys present a very bad model of Dominant. All direct after wedding s*x scenes are model examples of what Dominant should NOT be.
4. All factors above have totally destroyed all tension, all possibilities how to lead characters and etc.
Also the book is a prime example of presenting BDSM in a very untrue way.

I am very dissapointed.
As it is my second bad experience with this author's story I don't intend to give 3rd chance.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[SJ · Rating 5 out of 5]

"Because when we say “I do,” it’s forever."

Intense, hot, and full of passion.

In true Sierra Cartwright fashion, she brings the sizzling dark romance heat balanced with the emotional character journey. This book was fun, exciting, easy to read, and kept me turning pages. The plot was interesting while also deliciously spicy. I really enjoyed how the characters all fit together. The unexpected twist and mystery kept me invested in the story and the HEA was satisfying.

Dorian and Brennan are our two possessive OTT alphas who definitely give off the "touch her and ☠️" vibes while completely dissolving into a puddle of sweethearts. Isla FMC just balances them so well a breaks their hard shells. Isla is resilient and intelligent and overall a very likable character.

“You’re ours, Isla. And we take care of what belongs to us.”

Tropes:
Secret society
Reverse Harem
FMM
Billionaires
Forced marriage
Morally gray
Anti-heroes
Age-gap
Possesive
Virgin
Forced proximity
Touch her and ☠️
Multiple POV

Check TW


Book 6 of the Titans Captivated series can be read as a standalone.

[Michele · Rating 5 out of 5]

Wow, just wow on how this story unfolds with steam, secrets, danger and the prospect of HEA!
Isla fits the strong, female protagonist role perfectly as she fills in for her sister at her wedding to Dorian on the day of. What follows is an intense read as Dorian discovers the swap at the alter, and the power dynamics between them start! It’s not just Dorian as her husband though, Dorian’s right hand man, Brennan is included in their bedroom dynamics. The pull between the three keep you entertained, especially as Dorian can be attentive or distant at any moment where Brennan is always conscientious of Isla! While the road to the senate is Dorian’s end goal, it quickly becomes apparent that Isla was perfect as his wife by her actions! When the threats loom against the trip, how will it all play out? You have to read to find out and don’t expect to put the book down until you turn the last page

[Leanne Bryson · Rating 5 out of 5]

4.5 Stars for me. Isla Davenport is coerced by her father into marrying Dorian Vale—a ruthless, rumored crime lord—to protect her family, taking her sister's place. Dorian is cold and unappealing, with his loyal right-hand man, Brennan, as part of the arrangement.
Trapped in the marriage, Isla feels unexpected attraction to both men. She discovers the union includes Brennan too, forming a surprising throuple. Dorian is volatile (hot and cold), while Brennan is steady and reliable; Isla connects deeply with each.
All three share vulnerabilities, desires, and a commitment to succeed. Isla grows fiercely protective of her husbands, mirroring their growing guardianship over her. Amid intense physical chemistry, their emotional bonds build slowly and solidly. The story delivers a steamy, intimate polyamorous romance.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Lulu Brown · Rating 4 out of 5]

Wooooow, this book is fire! Seriously, the world-building was so well thought out, and the plot felt original, perfectly paced, and utterly delicious.

But let's be real—the characters made this entire story. They were complex, complicated, and let me tell you, they are HAWT together. Honestly, the tension and intensity were so thick that there were moments when I actually had to pause and struggle to keep reading because it was just too much in the best possible way!

I loved every second of that delicious stress, and I would LUV to read more of this series ASAP! Thoroughly enjoyed and highly recommend.

Girl, seriously, grab a copy, kick back, and enjoy!

(I received a free copy of this book via Booksprout and am voluntarily leaving a review.).

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Ash Juillet · Rating 3 out of 5]

This was a pretty slow book and I kept on thinking something more exciting was going to happen, but the plot didn't really progress until 2/3 of the book was over. The characters were fleshed out enough for the plot to make sense, but the relationship between the three main characters wasn't really dealt with correctly in the beginning. There was no chemistry in the beginning of the book - not good, not bad chemistry either - so I kept on thinking, 'maybe this is actually just a M/F book and not a M/F/M.' But then the characters ended up in bed and I thought, 'Okay, this might be able to be salvaged.'

I'm a fan of Sierra Cartwright's books; I've read almost all the books in this series already, but this one unfortunately just didn't reach my expectations.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Vievie2 · Rating 4 out of 5]

From the moment our heroine, Isla Davenport, is thrust into a marriage of obligation with the enigmatic and morally grey Dorian Vale, I was hooked - her bookish nature clashing so well with his powerful world, and the added dimension of Brennan, Dorian’s right-hand man, only added to the intensity. The story’s chemistry is off the charts, the emotional stakes are real, and it’s clear that the author doesn’t just deliver the heat but also gives the characters real transformation. If you’re up for a dark, seductive romance where nothing is black-and-white and you’ll find yourself thinking about it long after you turn the final page, this one’s a standout.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Anij · Rating 4 out of 5]

"I wonder how long I can keep saying no before I don't recognize myself."

I was back and forth throughout this entire book, specifically due to the two male leads. I absolutely adored Brennan. Like, serious book boyfriend. There wasn't a single thing about him I didn't love, and I really, really wish we had had scenes from his pov. He even bonded with Isla's kitty, Calypso, and took excellent care of her. He was truly amazing.

Almost as much as I loved Brennan, I disliked Dorian. He was arrogant and self-entitled, and everything he said and did was for his own benefit. I have no idea how he ever won Brennan's loyalty. Despite claiming they are equal partners and share everything, he repeatedly showed he doesn't believe it. He treated Brennan like his side kick, took him for granted, and usually ignored any advice Brennan tried to provide. He acted like he's the only one who's ever had their heart broken and shut himself off emotionally because of it. He constantly referred to Isla as "his" even when Brennan corrected him each time by reminding him she was supposed to be "theirs." If I had been Isla, I would have run away with Brennan and left Dorian to live his life miserable and alone. Yes, he finally learns his lesson and redeems himself, but I don't think they made him suffer as long as he should have or grovel enough. He didn't truly work for it, and I worry he will soon slip back into his selfish habits again.

I was suprised there wasn't more plot or any real action in the book, especially since, at just under 500 pages it is over double the length of every other book in the series except book five, "Theirs to Corrupt". Instead, over half the book are sex scenes. Lots and lots of sex scenes. I think it had more sex scenes than any other book of Sierra's I've ever read. Yes, they are well written and seriously hot, but I actually found myself skimming some to get back to the story. And, despite claiming they are "Dominants," there is almost no actual BDSM in the book. The only visit to the Retreat is made by Dorian alone, and all he does is play chess and talk with Altair.

The book is still enjoyable. My dislike of Dorian for 3/4 of the book didn't ruin it for me. And he had a few redeeming qualities, they were just repressed a lot. And I'd read a dozen more books about Brennan. I really wish we'd had the opportunity to learn more about his background and how he and Dorian became so close. There are a number of appearances by past and future characters from different books and even different series. My favorite part was getting to see Dante Moretti, my favorite mafioso, whose own story I am looking forward to with much anticipation. You can read this as a standalone as there aren't really any spoilers, either.

[Kim · Rating 5 out of 5]

What a scorching, engrossing book! Theirs to Possess grabs you from the first intense chapter! The chemistry between Isla and her men is palpable and emotional. I love the pacing that grabs you immediately and emotionally at the very beginning, then the plot unfolds more gradually throughout the book, ramping up the intriguing narrative. The spicy steam hooks at the beginning and doesn’t let go. As the plot blooms you become invested in the fierce, confident Isla and the conflict she feels. Her irresistible men are hot, sexy and commanding throughout, yet their growth and development secures the HEA for this steamy triad. Theirs to Possess is perfection!

[Gabrielle Lee · Rating 4 out of 5]

Isla never imagined her life would turn out like this. Forced to replace her sister as the bride to a bad man. Dorian Vale needs a wife and Isla finds herself as said wife. Little does she know that Brennan comes with the marriage.
I enjoyed seeing these three find their way. Theirs is not a hearts and flowers romance. But soon emotions come to play and bonds are created. Secrets are abundant and once they are revealed it could tear them all apart or make them stronger. This story moves at a nice pace and kept me engaged all the way to the end. It has strong characters and good world building that pulls the reader in. It has a good mix of emotions and heat.

[Tanya Rae ~ TaSTy WordGasms · Rating 5 out of 5]

Theirs to Possess: The Marriage Claim is the 6th book in the Titans Captivated series. This is Isla Davenport, Dorian Vale, and Brennan West’s story.

Isla is forced into a marriage by her father that she didn’t want, when her sister becomes a runaway bride.

Isla is now married to Dorian Vale. Brennan is Dorian’s best friend and partner in love and marriage to Isla. (no swords cross).

I was hooked on this book from the beginning! I loved “their” story! This is one of my favorite genres!

BTW thanks to this author for the cocktail recipe, alcohol and non-alcohol. I will be trying it!

[Debbie Brown · Rating 5 out of 5]

This book is action from start to finish as Isla is forced to walk down the isle to marry in her runaway sister's place. Her father is a corrupt judge who has made a deal with the devil and sacrificed his daughter. Dorian needs a high society wife to run for political office with his partner Brennan is right by his side. A captivating book with mafia ties thrown in, a young woman who wants nothing to do with her father, his money, and a new love triangle that's sizzling off the charts in this very steamy and sexy romance. I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Polli.p · Rating 4 out of 5]

Isla marries Dorian instead of her sister because her father owes Dorian big time. The daughter swap is a common theme in mafiaesque stories, it leads to stories where the unfortunate, usually nerdy and virginal, bride has to learn to love a man she should despise and discover family secrets that will change her forever. And that's exactly what happens here.
The enemies to lovers trope dominates the writing lending itself to Cartwright's spicy penmanship.
Though some of the story bends the realms of believability (a common flaw in this genre) it's a solid and entertaining read.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[JaneH · Rating 4 out of 5]

Isla, the replacement bride, Dorian, the groom and Brennan, their journey to a happy ending is fraught with secrets and control. Dorian has a past that he thinks rules him out for love. Brennan, whilst he too is a tad bossy is also a whole lot more intuitive with regards to Isla's emotions.
There is a whole lot of heat but it isn't enough for Isla and she leaves. She is a strong and determined woman who wants more in the relationship.
A bit of grovelling from Dorian in particular leads to a happy ending.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Zelda · Rating 5 out of 5]

This is the sixth book in the Titans Captivated series & can be read as a standalone. Isla Davenport broke free from her wealthy, influential family to pursue her own life. She’s dragged back into it & is used as a pawn by her father. Isla is so much stronger than everyone, including her new husbands Dorian & Brennan, anticipate. While I enjoyed the steamy D/s scenes, I appreciated the time the author spent building a relationship between the trio and Dorian’s grovel scene was done well. I enjoyed connecting with secondary characters from other stories, always a bonus in these worlds. I loved the storyline’s mix of politics, criminality, and family.

[Carol Demmon · Rating 5 out of 5]

Excellant story. Isla takes her sisters place and marries Dorian. He is surprised but goes ahead with the marriage. He has questionable business deals and Brennan who is always with him has a criminal background. She finds out that they share everything and she is one of them. Dorian is a cold dominate who wants total control and Brennan is the one who will protect Isla from Dorian. This book is full of drama, danger, hot passionate nights, tangled emotions, and a happy ending. I loved reading this book.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.