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Contract to Mate: Sci-fi Possessive Monster Romance Book in Space

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Brielle is done with Earth.

Done with deadbeat dads. Done with struggling just to survive. Done with being signed up for things so someone else can cash the check!

So when she’s taken off-world and handed a mating contract, she actually reads it. Every word.

And what does she find?

It’s the kind of deal that would get the man arrested on Earth.

But one look at the picture of her fated mate, specifically the larger form he can shift into, and suddenly she doesn’t care.

He’s fire and danger wrapped in a body built for destruction.

And he wants her.


Vaelith can’t touch his treasure.

He can’t even know what she looks like.

Not yet. Not until she agrees.

His species has been banned from Earth for being too lethal, too uncontrollable, too bound by instincts older than stars. So he waits in space, chained by laws written to protect the humans from his kind, until his match appears. Her.

If she signs, she becomes his.

Body, soul, destiny.


A high heat, sci-fi romance for fans of oversized males, fated mates, cozy happy endings, and dragons. This story is recommended only for readers who are really into dragons.

70 pages, Kindle Edition

Published November 10, 2025

188 people are currently reading
26 people want to read

About the author

Deiri Di

55 books108 followers
I'm just a lady with a foul mouth who really likes writing titillating stories about characters who go through experiences we don't have here on earth.

I like tea.

Yoga is life, meditation is therapy, and a birdfeeder right outside the window is the meaning to life, the universe, and everything.

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5 stars
87 (33%)
4 stars
72 (28%)
3 stars
67 (26%)
2 stars
23 (8%)
1 star
7 (2%)
Displaying 1 - 30 of 62 reviews
2,979 reviews30 followers
November 22, 2025
3.25 stars. This short story is dual POV, well written, and feels like the compressed, summarised version of an arranged mating, fated mates, sci fi romantic erotica. I enjoyed the pragmatic approach of Brielle, the female human lead. I enjoyed the surprise and joy of Vaelith, the male alien dragon shifter lead, that Brielle was happy to accept him. I enjoyed the consent focus and the introduction to intimacy between the characters. But I felt that this was just too short. There was so much more that would have enhanced the story and it felt rushed and incomplete, though I really liked the premise.

I received a complimentary copy of this book and am voluntarily leaving a review.
Profile Image for R Rais.
1,562 reviews43 followers
November 23, 2025
From the book description, " It is dragon smut in space. :) Includes EXTREME size differences, and knotting," you better believe it.

If youre like me who need strong chemistry to get hot and bother in steamy scene, unfortunetly its not here.

The four star i gave was for how detail the athor described the alien. I love how wild the author imagination for him.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for kymagirl.
6,283 reviews89 followers
November 8, 2025
She read the contract. Every word. Then she signed it.

Brielle didn’t sign up for the alien mate-matching program. Her deadbeat dad did it for her. But once she’s on the moon, facing a glowing contract and a spider-like diplomat, she makes a bold move: she reads every clause, lays down her own terms, and agrees to the match. Not for him. For herself.

Vaelith has waited centuries. Forbidden from Earth and too dangerous to approach a human unbound, he stays in orbit, holding back instincts older than stars. When she signs, she becomes his. But she’s not a prize to take. She’s a mate to earn.

Their first meeting is raw, intense, and nothing like a typical first date. But what starts as a primal chase builds into something lasting. She sets the pace. He gives her everything. What follows is heat, care, and the kind of bond that doesn’t fade.

Brielle rises from confusion to clarity, claiming her own story with sharp edges and soft strength. Vaelith, all control and instinct, transforms into a partner who doesn’t just take, he worships, protects, and adapts. Together, they create a connection rooted in trust, reverence, and want.

A scorching, fated mates sci-fi erotica with an alien dragon shifter, extreme size difference, knotting, praise kink, and mating heat. It explores consent, autonomy, trust, transformation, and erotic power dynamics. It's about choosing your fate, embracing desire, and being seen by the one who was made to treasure you.

The Elevator Pitch: A scorching sci-fi romance where a human woman agrees to be claimed by an alien dragon shifter too dangerous for Earth. What begins as a primal chase explodes into heat, care, and a bond written in instinct and desire. It's raw, intense, and deliciously unhinged in all the best ways.
Profile Image for Arctic_Banshee.
377 reviews3 followers
Read
December 6, 2025
The terms and conditions of an AI/Machine Learning licensing document that make up a third of this book —after the story — was more interesting than the story.

Meanwhile, stuffing the page count of your book is skating around false advertising when you declare your book is 70 pages when it’s really actually 43… Not counting the back matter.

Profile Image for Tedra.
352 reviews2 followers
December 5, 2025
Very short

It ends like on page 47 the rest of the book is all ads and a weird AI thing.
Anyway the premise was neat but the smex was ok, not very hot.
Profile Image for Gleeful Goblin Reviews.
637 reviews20 followers
November 18, 2025
Gleeful Goblin Review: Having a translator installed so you can discuss the marriage contract with an alien that you haven't met and that you didn't think would happen because your good for nothing father set it up and basically stole the money....rough way to start any day. But having to make a long term commitment to this sight unseen alien before you can even meet him is enough to give anyone pause! On the plus side though....when this contract is so minutely detailed you know ahead of time about what fluids are or aren't allowed and can set some boundaries of your own that's a pretty nice feature.

It's also hard to resist anyone whose first impression of you is so flattering: "She was tall for a human, with long, thick legs, built with a kind of strength that came from living rather than training. My gaze lingered shamelessly, drinking her in. The faint sheen of warmth across her chest, the quick rise and fall of her breath as her own gaze traveled across me, the way her hair framed her face in loose, unbothered strands. She was lush. Fertíle. A vision carved for worship as well as touch. Her softness wasn't weakness; it was abundance. Every curve, every ripple of her body spoke of life and warmth and decadence, and I couldn't look away. I didn't want to look away. She took a step forward, looking around the space, her entire body jiggling with such unabashed seductíveness. I wondered how on all of Earth she hadn't been snatched up by some other male. I was so incredibly lucky. Lucky that she was willing to leave her home, her planet, her family, just to come be with some male she had never met."

This is a VERY fast burn, high heat novella that gets right to the point but still has enough story to lose yourself in and leave you wanting way more. 5/5 Stars
Profile Image for Chandra Luna.
1,776 reviews12 followers
November 18, 2025
If you’re craving a sci-fi romance that crackles with heat, agency, feral devotion, and a heroine who refuses to be anyone’s victim, Contract to Mate delivers an absolutely addictive, deliciously chaotic ride from first clause to final claiming.

This book isn’t just spicy—it’s smart, empowering, and surprisingly emotional.

What Makes This Story Shine

This novella may be short, but it packs a cosmic punch. It’s:

✨ Scorchingly erotic, with fated-mate intensity, size difference, praise kink, knotting, and mating heat.
✨ Deeply consensual, using a literal contract to explore power, boundaries, and trust.
✨ Emotional, because Brielle isn’t lost—she’s choosing transformation.
✨ Empowering, showing a woman reclaiming her autonomy and rewriting her future.
✨ Tender in surprising ways, especially as Vaelith shifts from a restrained predator to a partner who worships every inch of the woman fate gave him.

And the writing?
It’s vivid, unapologetically sensual, and packed with moments that feel like someone turning on a light in the dark corner of desire you didn’t realize was there.

Why You’ll Love It

If you enjoy:

⭐ Alien dragon shifters
⭐ A heroine with backbone and bite
⭐ Heated chases grounded in consent
⭐ “Too dangerous for Earth” heroes who melt for one woman
⭐ Erotica with emotional depth
⭐ Fated mates with teeth

…this book will hit every single button.

Contract to Mate isn’t just about desire—it’s about choosing your fate, owning your passion, and finding a love that sees every part of you as treasure.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Nina Diab.
5,306 reviews51 followers
November 16, 2025
"You are my mate, my treasure," I purred. "I will provide for your every need, your every desire, you only need to voice them. The contract isn't to limit you, it is to ensure that our first mating isn't frightening."
"I'm not frightened," she murmured. "I... When I was little, I used to look up at the clouds and imagine someone like you was flying above me," she said, her lips parted and glistening as she stared at me, as if I were the answer to all her dreams. "I would wish you would fly down and pick me up so that I could leave the world behind and travel through the sky with you. I'm not frightened because I've spent my whole life dreaming about running away with you."

I loved this book. It was a fun, steamy romance and a fast-paced adventure. Good world building and wonderful characters. I loved both Brielle and Vaelith. I liked the initial contract building with Brielle beforehand, to make sure what was expected and understood on both sides. I thought the two of them were really cute together, and the chemistry between them sizzled. 5 stars
Profile Image for Rhae Asphy.
Author 2 books12 followers
January 13, 2026
ARC review submitted via Booksprout!

Before reading it, I already knew it was going to be something short to entertain and not a long novel full of information or character development. The purpose of entertaining is fine. 40 pages (according to my pc) that are meant to be enjoyed as a short, easy read, perfect for taking a break from dense books.

This is the second story by Deiri Di that I've read. I'm giving it 2.5 out of 5 stars because I found Vaelith charming and very cute, but that's all.Although short stories are meant to entertain and pass a quick hour, you can create memorable characters or a backstory that stays with the reader.Personally, it only reminded me of Regine Abel's books and series, which, interestingly, are also about matings through an alien service. That made me think: Where does the inspiration that both authors share come from?

Putting that aside, I would recommend this story whenever I post about Monster Romance or talk to a friend about these stories. although it doesn't stand out too much among other stories with the same theme.
9 reviews
January 17, 2026
This was a quick read and very different from anything I had read before.
Our FMC Brielle has been signed up for a mating program by her drug addict of a father. But she's no shrinking violet! She sits with the Spider type creature who is going through the contract with her line by line. Brielle makes her own additions, including bringing her cat from earth to be with her and having earth internet access.
You have no idea what sort of creature she will be with since she has to wear a health tracker and it apparently will take 3 guards to get her out if she backs out!
She's not afraid though - and asks to see a picture. Turns out she's meeting Vaelith and I won't share spoilers about him.
It's a quick read - but you do get a good sense of the characters. It was fun and spicy,.

I received a free copy of this book and am voluntarily leaving my honest review
656 reviews4 followers
November 29, 2025
Brielle finds herself hustled onto a transport and is now in a room talking to a sentient spider like woman and reading through an extensive contract. She signed up, but didn’t receive any notifications, so she assumed she didn’t match with anyone. She didn’t count on a betrayal she is finding out that she has a match and has to go through the contract line by line and apparently that she has the option of accepting or rejecting or changing parts of the contract.
Contract to Mate is a Sci-fi Possessive Monster Romance book in space and a really good read. The storyline and characters are great. Grab this quick spicy read and enjoy, I know I did.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Sandra.
684 reviews
December 21, 2025
This is a super super short story. It's OTT ridiculous and a fantasy kink.😝 Brielle, a woman from Earth, with a Dad who has a substance addiction, signs a contract for her true mate and leaves her world behind for him.🚀🌌 Who's her mate, you ask? It's a doozy. Vaelith, a shape shifter dragon. No amount of stretching and exercise regimen can prepare her for that one.😨🙄 That's part of the story. I'm not kidding.lol Size difference. Uh-huh.🙈 The transformation of Vaelith into his monster form was an interesting one. Slight spoiler. I believe Brielle will become a dragon herself.☄️🐉I also think they loved each other. Happy reading.*•>§<•*💚🖤💚🖤

🪐💥🛸Thank you to Ms Di and Booksprout. The opinions shared here are my own.🛸💥🪐
Profile Image for Carole.
2,046 reviews15 followers
November 4, 2025
Contract for a Mate is a little novella whose MFC Brielle is signing a contract with an alien mate matching program, and is about to meet MMC Vaelith from a species known as the Eldryx who she has been matched with.
After seeing images of him in both his forms Brielle is more than happy to sign on the dotted line because he is her dream come true, and for Vaelith her lack of fear of him is a welcome relief, and he is more than happy with his curvy new mate.
Cute little steamy story that is nicely written and an entertaining treat from one of my favorite authors.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Fiona.
2,762 reviews32 followers
November 7, 2025
This is an amazing story about Brielle who is a human and Vaelith who is an alien dragon shifter. The stories short, but spicy, and if you love this type of story, you will love this book. Brielle Was signed up for a breeding program, with an alien Vaelith, anxiously wanted to have his mate, so he can do all kinds of things to her, and was amazed that she was not afraid of him. While I do enjoy Short stories, this story could’ve gone a little bit longer and given us more, There was enough storyline to reach their HEA.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
70 reviews
November 14, 2025
Spice: 5/5
Genre: Novella, Alien Romance, Dragon Romance, Monster Romance
ARC Source: I received an advance review copy and I am leaving this review voluntarily.
Thoughts: Contract to Mate by Deiri Di is a fast-paced, fiery blend of dragon and alien romance that delivers both heat and humor in equal measure. You can’t help but enjoy how Di weaves a comedic punch throughout the story. It also has me thinking, why didn’t I get a prenup with some of these requirements? Maybe my marriage would have turned out a lot better! Overall, it’s a great palate cleanser between heavier reads. Its perfect balance of spice and comedy, keeps you hooked to the very end.
Profile Image for Becky.
1,695 reviews4 followers
November 8, 2025
I love a super steamy alien romance, and this one definitely fits the description. Brielle's deadbeat dad secretly signed her up for a mate-matching program with aliens and then had all the money sent to his bank. Now she has to honor the contract, and she finds that she is looking forward to it despite how it all started out. Vaelith is her genetic match, and he is doing everything that will make her happy and comfortable. I enjoyed this story. Be ready for lots of spice!

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Barbara.
19.2k reviews8 followers
November 6, 2025
The first book in the Smutt Books Short Alien, a good start to the series. Brielle, signs up for an alien mate matching program. She is matched with Vaelith, an Eldryx. Brielle is thrilled with Vaelith's appearance, and he is equally pleased with her lack of fear and her curvy figure. This is a well-written, steamy, and entertaining story. I received a copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Heather.
85 reviews2 followers
November 8, 2025
I enjoyed this book. It was a fun, short, entertaining read. A major element of this book was the informed consent the female main character provided before the mating she was to engage in, which was refreshing. This was especially interesting given the male main character's opinion on the consent. I would have enjoyed this book even more if it had been longer and delved deeper into their relationship.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Crystal Junebug.
392 reviews
November 18, 2025
If you like a quickie filled with spice of all kinds, this one is for you. There's so much of it jammed packed into such few pages that if British gov, knew about this book, the would have tried to colonize it. Anyway... this quick and fast burn will leave you gasping and squirming in your seat and will only take about an hour of your time. Definitely a fun read.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Iluvbks.
583 reviews6 followers
November 19, 2025
This is a short story and that is just what you get. It was a fun read. More like a tease. This would make a great full story or stories with this mating service. I liked how you got some history of their lives but not much. You read how excited he is to have her as his mate. She was very understanding and her secret desire has come true. Nice short read.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Jordan Fiest.
2,106 reviews31 followers
November 20, 2025
Contract To Mate is book one of the Smutt Books Short Alien Romance.

Brielle is fed up with her life and everything going wrong in it, so when she has the opportunity for a mate she takes it. What we get is some spicy and smutty scenes between Brielle and Vaelith. Brielle has always had a specific kink in mind and finally gets to expereince what she has always imagined. Short read, but filled with enough for a great story.
Profile Image for Candy.
303 reviews3 followers
December 20, 2025
GOOD STORY!

I enjoy reading novellas when I tire reading novels and just need a quick read. Of course, the downside of novellas, is if I enjoy it, I wish it would be as longer. Deiri Di writes a lot of details. About Vaelith, the dragon, and his transformation. Brielle is given instruction on stretching to be able to mate with him. Who wouldn't want to be pampered and given everything you want, wow!
1,124 reviews16 followers
November 2, 2025
Brielle has been signed up for the Norratas's mate matching service without her knowledge. Now she has a decision to make. Vaelith is already smitten with Brielle as soon as he saw her. This is a fun read. I look forward to more books by Deiri Di.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Lisa Bing.
6,236 reviews70 followers
November 6, 2025
This is another great read by this author and I loved seeing Brielle and Vaelith find their way together. She's signed on with an alien mate matching program. Vaelith is and Eldryx and he absolutely loves her lack of fear of him. She really likes both his forms and is excited to sign on the dotted line ;P This was cute and spicy and definitely entertaining. Good fun!
915 reviews1 follower
November 10, 2025
What a surprise! It's so vague and keeps you guessing until almost til the very end just why there's so much secrecy behind taking Varsity as her mate. Brielle's got some surprises too, which make this a short sweet read. Quite enjoyable.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
405 reviews3 followers
November 10, 2025
Brielle is in for a treat when she learns just what kind of alien she is agreeing to! Vaelith is a two for one special kind of hunk checking the alien and minster boxes with all the informed consented spice you can handle!!! Loved him in both forms!!!!.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Trixie.
5,201 reviews
November 10, 2025
The FMC is really something. I chuckled when I learned her reason for signing the contract so quickly after seeing her mate’s picture. Well, it turned out he was a dream come true for her. I wish it was longer, though.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Andi Downs.
1,459 reviews14 followers
November 10, 2025
A great sci fi short featuring Brielle, who is looking for love, off world. She's taken to meet her prospective mate and his alternative self. Vaelith, is both man and beast, a Dragon. There are unusual circumstances around their meeting and yet Brielle is taking a chance. They both are.
I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for Tanya.
917 reviews6 followers
November 12, 2025
So excited that Deiri Di released another novella! Her quick monster romances are so creative and spicy 🌶️ that I lose all awareness until I finish! So fun and the MFC is brave. I also like that her love monsters are gentle with their partners. Definitely worth the read if you like this genre.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
3,020 reviews16 followers
November 12, 2025
loved it !! a great start for this new series !! love Brielle and Vaelith ... this is their contract... a fun fast paced rom/com drama...short... she's done with earth and earth men... he's been waiting for a mate forever... she's sent to him and reads the contract... will she or won't she ? so good !!.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Displaying 1 - 30 of 62 reviews

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