Nanny and the Beast: A Dark Billionaire Romance

by Aria R. Blue

He watches me.

Even in the middle of the night, I feel his eyes on me as I sleep.

Klaus Sinclair is the monster that everyone warned me about—and now, he’s my boss.

The brooding billionaire is the guardian of two small children. The little girl looks at me like she hates my guts, and her younger brother is sunshine in human form.

Klaus is older. Ex-military. Carved from shadows.

The mansion is colder than his stare—full of locked doors, soft footsteps at night, and secrets that breathe.

Then there’s us—tangled in a game of push and pull.

Until one night, I hear him screaming in his sleep.

I try to help.

He pins me to his bed with his hand around my throat.

And just like that... everything changes between us. I awaken the possessive beast in him. He claims me as his.

But I have a secret of my own—a salacious weekend job at the gentlemen’s club he’s a member of.

If he finds out?

He won’t just break the rules. He’ll break me.

Genres: Dark Romance

495 pages, Kindle Edition

Published June 14, 2025

Reviews

[Laur3n_b00km0m Haines · Rating 3 out of 5]

The love/hate between the main characters was awesome. I loved that the Nanny got the old grumpy beast to love and feel again. I truly enjoyed this story.

[Keema Osborne · Rating 5 out of 5]

Wow, this book left me speechless. I love the interaction between Emma and Mr. Sinclair. It’s fun, amazing and the chemistry between the two of them are off the wall. I must say what intrigued me most is there ability to sense each other. I also love Emma’s instincts when it comes to the children. She always seems to know how to make they feel at ease and loved. Whereas Mr. Sinclair is very protective of everyone he loves. Especially when it comes to dealing with Emma’s stalker , he definitely passed that with flying colors. Most of all I love how slowly Emma worked her magic on Mr. Sinclair.

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

[Nicole · Rating 5 out of 5]

Nanny and the Beast a steamy and heartbreaking story of damage and broken individual who has isolated and closed off himself and heart from relationship and feelings until Emma his nephew and niece nanny came along and reawaken his cold heart. A beautifully written story with complex individuals and a twisty and fascinating storyline that grabs the audience attention from the first chapter and keeps you riveted and on the edge of your seat and turning the pages. An unputdownable and absorbing addictive read. This book demands to be read and screamed escape from the everyday life and gave that something extra that you craved and never knew that you needed. This is Emma and Klaus story which is told from a dual point of view.
Captivating. Decadent. Dark. Compelling. A fast paced, thrilling and gripping read. Immerse yourself in this mesmerizing rollercoaster ride filled with mystery, drama, steam, tension and heart-stirring emotions and follow along as these two characters fall in love. A total page turner; with the perfect mix of interesting characters, personal drama, chuck load of steams foul play hidden secrets. A romantic and sizzling hot read. This novel is quite emotive and the way these souls come together is exquisitely portrayed.
Kudos to Ms. Arie she has managed to bring the reader into the story and we felt all the emotions. A story of healing, redemption, forgiveness, acceptance, suspense, pain and hurt and intrigue. A nanny romance, aged gap trope romance, forbidden romance, off-limits romance, taboo romance, employee-boss romance, surprise pregnancy romance, gothic romance, contemporary romance, workplace romance, billionaire romance, romantic action & adventure romance, single dad romance, new adult romance, action & adventure romance fiction, military romance, surprise pregnancy romance with passion, danger, trauma, madness, survival, darkness, love and more.

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

[Lauren Sengele · Rating 4 out of 5]

I do love a good billionaire romance. This one also has the boss-employee and age-gap tropes, but those are merely background to a love story between two broken people who learn to open themselves to the love they've found in each other. This story paints a dark picture of what how enduring and difficult PTSD can be, without going into any details of the events that triggered it.

Our FMC is determined, strong, and deeply caring. But she's struggling with a dangerously obsessive stalker and a pile of bills. Our MMC is a wealthy uncle to 2 orphaned kids - but he has massive PTSD and can't stand to be touched and generally doesn't like people.

So enter the nanny to care for 2 small children who have not only lost their parents, but their uncle can't even hug them, comfort them, or give them the love they need.

This dual POV is full of wishing, wanting, second-guessing, and sometimes a full failure to communicate. It's absolutely sexy - this man has a filthy mouth and talks dirty non-stop. She pushes his buttons and wants to submit to all his darker urges. The sex is great, but the chemistry and the D/s is beautiful without being super BDSM-y. He is definitely a beast, but he has a depth of feeling few men can realize.

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

[Anita · Rating 5 out of 5]

Nanny and the Beast by Aria R. Blue is full of mystery, suspense and a steamy hot romance between a billionaire uncle and the nanny he hires for his niece and nephew.

With his PTSD, Klaus is doing the best he can raising his niece and nephew. Emma needs a well paying job to help her grandmother and to try and stay hidden from her stalker. When Emma gets an interview to be a nanny for Klaus's niece and nephew, it is instant connection. Although they try to fight it, they eventually give in to temptation. Through the secrets they keep from each other to the mutual love for Klaus's niece and nephew, can these two weather the storms that are coming for them, is their love enough?

Klaus and Emma are definite steam when they are together. Those scenes are HOT! The storyline is also well written. His past and her past shape who they are today and they eventually break down each others barriers. The element of surprise and mystery Aria writes throughout Nanny and the Beast definitely makes this book a page turner and grabs you in. This may be the first book I have read by Aria R. Blue but it won't be the last. If you are into some steamy scenes with some suspense thrown in, this is the book for you.

I received an advance review copy for free, and I am leaving this review voluntarily.

[love2read · Rating 5 out of 5]

What a steamy delicious story…I loved every bit of it! This book had me whispering "no way" and “what the heck is happening?!! throughout most of the story. It is poppin’ with action and chemistry. Everybody has a secret, and the revelations hit me like little mini gut punches that stole my breath away. There are so many emotions and unknowns, lots of twists and turns that I felt like I was on the edge of my seat from page one!

This was my first time reading this author’s work courtesy of an advance review copy I received for free, and I am leaving my honest review voluntarily.

The Nanny and the Beast is an excellent well-paced story that’s filled with suspense, mystery, intrigue, danger and some kinky sex😊. I couldn't turn the pages fast enough. Ms. Blue has a beautiful command of words and knows how to bring the reader right into the world she creates. Emma and Klaus left me breathless, and the supporting characters left enough of an impression to make me hope for more of their stories, too (especially Aleric who was laugh out loud funny).
I'm a little sad it’s over, actually and I will be reading more from this author for sure!!!!

[Char · Rating 5 out of 5]

Klaus is the real enigma in the story. Klaus is cold and untouchable. Emma has secrets that might get her killed. The children, James and Rosalina just want love. Since their parents died they are uncertain and long to be loved and treated with tenderness and warmth. Klaus has issues from his sister’s death and the war, fights and attempts at his life, violent nightmares, uncontrolled rage and zero touching. All things he does not talk about. One thing that has Klaus stymied is when Emma is near or she touches him- he feels calm. He still is trying to figure that out. This house and the people in it all have many secrets that slowly will begin to be peeled away. What will happen? This story is complex - interesting and unique. The characters are also complex. Will anyone breakout from their self imposed prison. It is such a good read. Fierce, passionate, loving.

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

[Elise Jordan · Rating 5 out of 5]

This book is a gothic age gap romance and it’s amazing! It’s a story about two people who go through so much to finally be together. However, as mysteries are revealed and parts of the dark past of both of them has been brought to light I wondered if they would survive what was hidden within themselves. This story is about a man who has PTSD and now is the caretaker of his dead Sisters children. He’s not a compassionate man anymore and has turned so far into himself he appears just cold and mean. Then he hires a Nanny who brings forth in him feelings he buried long ago. She has her past traumas also but hasn’t turned inward but instead is his light. The heat in this book is sizzling! The twists and turns are jaw dripping and it has an HEA that will warm your heart! I’ll be reading more books by this Author! I received this book as an ARC and my rating is done because I wanted to write it! 🖤

[JLH · Rating 4 out of 5]

Emma needs money to pay for grandma's medical bills and to stay afloat. The agency sent her to Mr. Sinclair's dark looking mansion to interview as a nanny. She barely gets to sit down before she is kicked out of the house. His PTSD from being in the service refuses to allow the simple touch for others. But his charges, niece and nephew needs someone who can keep up and be his arms of comfort. Everyone is in turmoil. She has a person who gives unwanted to her and Sinclair wants to keep her and his family safe. The house has it's own characteristic that are mysterious. Including the screams from the wind what sound a a person shuffling in a locked room, or should be locked room. Interesting. Loveable kids who want normalcy and attraction between the nanny and bossy boss. What could go wrong? Or right?.

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

[lf · Rating 4 out of 5]

Secrets, lies and danger

Nanny and the Beast is a bit dark and very delicious. The story is about Emma and Klaus. She is a nanny who he hires to care for his niece and nephew, Rosalina and James, who were orphaned after Klaus's sister and brother in-law died. He is a billionaire with some major issues of his own. He suffers from PTSD and as a result does not like to be touched. Meanwhile all the kids want is to be hugged, held and cuddled with love and affection, telling them everything is going to be okay even though they don't have their parents any more. Emma is a wonderful nanny and does great with the kids. But she comes to the house with her own issues, as in one dangerous stalker and a second job to help pay the bills. What happens between Emma and Klaus is not in the employment contract but it sure is worth breaking it for.

[Jenny Harris · Rating 4 out of 5]

I received this book with the understanding that I could leave a voluntary and honest review.

In this book we meet Emma Turner & Klaus Sinclair. Emma has come to the Sinclair household looking to get a job as the children's nanny. What worries her at first is when the previous candid comes out telling her to run. Once she meets Klaus she knows she has not chance at the job no matter what she wants. Klaus is dealing with a lot ever since they lost his sister and brother-in-law. Now with having to not only deal with his own businesses he needs someone reliable to watch over the children. Just seeing Emma has thrown him off, but he knows she would be to much of a distraction she would be. Can they find a HEA or will others make sure that never happens?

An amazing story by this author. I would highly recommend it to anyone.

[Carole · Rating 4 out of 5]

Nanny and the Beast is a billionaire romance that has touches of two of my favorite stories running through it’s narrative.
A definite beast, Klaus Sinclair and a beauty Emma who becomes nanny to his orphaned nephew and niece.
Stir the mix with a little Jane Eyre mysterious goings on and a tidy suspense filled story of passion, family, danger, action, personal vulnerabilities, intrigue and secrets pulls together a nicely written tale of a beast who is tamed by the love of HIS woman, but then loses her!
A lot of different threads wind their way through this intriguing story which weaves them together in a richly entertaining read I enjoyed following to its revelation filled HEA.

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

[SJ · Rating 5 out of 5]

This dark romance is not just a nanny and her billionaire romance, there's suspense and mystery. A cliché with a twist. The steamy scenes are piping hot! I love a good forbidden romance.

One of my favorite things is 1st person dual POV and being able to "look" into the minds of the characters and the thoughts behind their actions.

Emma the FMC is young but has a backbone and speaks her mind. She has some secrets from her past and a stalker.

Klaus the MMC is crass, bitter, and jaded but soon we find he opens his heart is protective and becomes obsessed. He has a dirty mouth that just won't quit.

I love the instant attraction, forced proximity, and tension.

Will she tame the beast? Read and find out...

[Debbie Brown · Rating 5 out of 5]

Loved this story Klaus Sinclair, billionaire ex military man needs a nanny. Sweet Emma has mystery surrounding her, she needs a job. Klaus is very hard person to get to know his abrupt and arrogant, but he loves his neice and nephew. A fascinating story of two people learning to trust each other. I love the interaction with the kids, Emma and the reliant uncle who’s trying to better for them both physically and mentally. After the twists and turns the story takes and some secrets are uncovered can they forgive and forget and grab the love they all deserve? I received a free copy of this book via Cherrylily ARCs and am voluntarily leaving a review.

[Sassy Angel · Rating 5 out of 5]

I love reading anything by Aria R. Blue. I couldn't put this one down. I was caught up in the action from the first page and couldn't wait to see what happened next for Emma and Klaus. Klaus is the uncle of two small children and in need of a nanny. He is going through a lot and struggles with the two children. He doesn't like to be touched. Emma needs a job and thought she lost a chance at working there. She is dealing with a lot. There are mysterious things going on in the house. Emma and Klaus are attracted to each other but Klaus tries to stay away. Will they get their happily ever after together?

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

[L KQ · Rating 5 out of 5]

Light to his Beast

Emma interviews for a job as a nanny, but it did not go well. Klaus needs someone to watch his niece and nephew, but his immediate attraction to Emma shakes him to his core. There was a deeper mystery tied into the plot and its characters that were unexpected and interesting. The Beauty and the Beast vibe added a whole other layer to this story that I could not put down. It was an emotional journey with moments of spice that made this an entertaining read.

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

[Terra Oenning · Rating 5 out of 5]

Wowsa this book is so good it will definitely have you engrossed from the beginning until the end. When Emma applies for a nanny job will sparks fly between her and her boss Klaus or will he be mean boss and try to keep his distance from her? Great Book filled with suspense and action packed with chemistry and romance and heartbreak and so much more.

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

[Jurae · Rating 4 out of 5]

Emma is looking for a job to help out with her grandmother's medical expenses. What she isn't expecting is to be rudely dismissed by a potential employer. Klaus is a scarred man, both inside and out, with many secrets. He makes no excuses about being a monster, but Emma is just the person to tame the beast. I enjoyed reading this book.

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

[Sammye · Rating 5 out of 5]

This is an excellent billionaire, age gap romance. I was drawn in right away and thoroughly enjoyed it. Kraus is in charge of his niece and nephew and needed a nanny. Emma applied and got the job. He made things hard for her at first and was very unkind. But he was so attracted to her, things soon changed. This spicy romance is so entertaining. I loved Klaus’ dirty talk!! Amazing read.

[Michelle Starika · Rating 5 out of 5]

Couldn’t put it down

This book was everything. 🤌 Deliciously spicy, full of secrets, great plot. Loved the characters. Klaus was….i mean I have no words for the man. He is perfect in every way. This is my first book by this author and based off of how much I loved it, I will be reading more by her. I absolutely love the age gap, nanny, surprise pregnancy tropes. And this delivered!🙌

[MsRoman · Rating 5 out of 5]

Nanny and the Beast: A Steamy Billionaire Romance By: Aria R Blue. Klaus Sinclair is ex military he is left to care for his niece Rosalie and nephew James. He mourns his sister and the loss of his team . Emma is the hired nanny and everything in one package but she has secrets. Alaric is Klaus best friend, confident, hilarious. It’s a beautiful story with many twist and mystery . It was spectacular loved it

[Judy · Rating 5 out of 5]

Klaus needs a nanny to help take care of his late sisters children. He has severe PTSD where he can't stand to be touched. He also has a whole lot os secrets that weighs heavy on him. Emma has her own issues. Running from a psychotic man and also working at the gentleman's club Elysium. This is emotional, mysterious, and steamy.

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

[Narelle · Rating 5 out of 5]

Klaus Sinclair may be Emma's employer and her lover, but the pair can't stay away from each other. A steamy and possessive read with a man who was quite different, much warmer even, than what I initially thought he would be. And his younger love who goes from innocent and inexperienced to so much more. I love it!.

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

[Shelly Brown · Rating 3 out of 5]

This was a romance with a gothic style mystery. Klaus was raising his niece and nephew and is emotionally distant. Emma is in need of a job and connects with the children even though Klaus refused to hire her. The premise was good, and it started in a way that got the reader's attention. It just didn't carry all the way through for me. I received an advance review copy from Booksirens for free, and I am leaving this review voluntarily.

[Jade Godfrey · Rating 5 out of 5]

Honestly what can I say!? Steamy, suspense and honestly the best storyline. Honestly really enjoyed this book! I couldn’t put it down, loved how the main characters love story slowly developed and was very hot. To what was lurking in the halls at night. Would 100% recommend it to anyone as was a really easy read.
I received an advance review copy for free, and I am leaving this review voluntarily.

[Aleaf · Rating 4 out of 5]

-arc provided by the author

I went into reading this thinking it would be like the classic spicy age gap boss romance BUT I was pleasantly surprised that it was so much more than that. For fans of Victorian literature and classic gothic tales this book is top notch. The best way I can describe it is a super spicy Turn Of The Screw and I was really excited to see that story turn into something modern and accessible for a romance reader! This book was great!

[Anna · Rating 4 out of 5]

ARC Reader

4 ⭐

I enjoyed the writing style, which was fluid and easy to read. I didn't notice any major errors. Concerning the plot and narrative, I enjoyed it as well, and the romantic scenes were well-written. What I liked most was that the FML wasn't completely submissive to the ML's sayings, and she stood up for herself when necessary, but also knew when to yield. Overall, it was a good book. Would recommend.

[Unrulyreadr Reviews · Rating 4 out of 5]

This was a good read, it started of rough. It seem like it was a rough draft, or the author didn't which way she wanted to do at first. But then it all snapped into place and then it got good. Emma and Klaus was a good couple and they worked good together.

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

[Lisa Bing · Rating 5 out of 5]

This was a gripping read that brings Emma and Klaus together. He needs a nanny for his niece and nephew and Emma really needs a job... What follows is an engaging romance that swirls around action, danger, mystery, intrigue, secrets, twists and spice. The ending was fab with all the revelations and I enjoyed the reading ride :D

[Curves Reads · Rating 5 out of 5]

I had no choice, but it's a binge. I took a break halfway through because I really didn't want the story to end. I felt mixed emotions while reading I laughed I cried I got pissed. Hopefully the author makes more books on Emma's friends. I received an advance review copy for free, and I am leaving this review voluntarily.