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Alien Heir

Cosmic Mates #7 / 8
by Cara Bristol
Alien Heir (Cosmic Mates #7) by Cara Bristol
★ 10.00 / 1
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Marry a stranger to escape an arranged marriage? Sure, why not?

Prince Jaryk Rullok-Myka has a royal-sized problem. His parents are hell-bent on marrying him off to a noblewoman he’s met exactly twice. But his evil-genius little brother finds a loophole: if Jaryk’s already married, he’s off the hook. Enter Cosmic Mates and one reluctant human bride.

Kismet Kennedy isn’t here for love. She joined the galactic matchmaking service to avoid being separated from her twin sister—so of course she gets matched first. Her new husband? An alien “government official” from Kaldor with a killer jawline and way too many secrets. They’ll stay married for a year, then go their separate ways. Easy.

Until royal drama, ex-lovers, scheming siblings, and inconvenient feelings turn their fake marriage into something dangerously real. Buckle up—it’s going to be a bumpy ride to happily ever after.

* * * *
Cosmic Mates sci-fi romances are released in “duets,” each two-book set is its own mini-series. Books one and two are a set, books three and four are a different mini-series, etc. Alien Heir is the start of a new duet. All the Cosmic Mates sci-fi romances can be read as standalones.

Genres & Tropes
Science fiction romance, alien romance, marriage of convenience romance, arranged marriage romance, scifi human alien romance, alien prince charming, love triangle romance, fake relationship romance, twins romance

Amazon: Check Best Offer

Science FictionRomanceAlien Romance
Release date: July 21, 2025
Reviews and Comments (1)

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Cara Bristol

Cara Bristol is a USA Today bestselling author who has carved out a unique niche in the world of science fiction romance. Known for her captivating stories featuring tough alien and cyborg heroes, Cara’s novels take readers on thrilling journeys where strong-willed heroines and brooding, powerful protagonists collide in worlds full of passion, danger, and adventure.

When she's not conjuring up faraway galaxies or envisioning futuristic worlds, Cara enjoys the quiet pleasures of home life. A self-proclaimed homebody, she shares her life with her husband, a wanderer at heart. Together, they travel the globe while checking off items on her bucket list—most notably, visiting all seven continents and, in a lighter moment, petting a squirrel. It's these very contrasts—her love of the familiar and her curiosity for the unknown—that infuse her writing with depth, allowing readers to escape into complex, yet relatable stories.

Read more ...

Cara’s journey into writing began in 2009 with her first erotic romance. Over the years, she transitioned into the world of sci-fi romance, where she found her true calling. With over twenty-seven books published, her most beloved series, like Breeder and Cy-Ops, showcase her talent for blending steamy romance with fast-paced adventure. Cara's books are celebrated for their emotional intensity, strong characters, and the way they explore relationships in otherworldly settings.

An avid reader herself, Cara is deeply influenced by her love of science fiction, adventure, and romance, and this passion is woven throughout her works. Her fans appreciate the way she effortlessly combines high-stakes plotlines with heartfelt emotions, creating stories that are as thrilling as they are touching.

Outside of writing, Cara remains active in her community of readers and writers, frequently engaging with her fans on social media. Whether it's sharing sneak peeks into her upcoming projects, posting humorous extras, or just chatting about her latest squirrel sighting, she loves connecting with her audience.

For those new to her work, Cara offers a free sci-fi romance novel on her website, inviting readers into her universe of unforgettable heroes and heroines. With each new book, Cara Bristol continues to build her legacy as a leading voice in science fiction romance, one passionate, thrilling story at a time.

Cosmic Mates

Not all soulmates are born on Earth. In Cosmic Mates, love is written in the stars—sometimes in alien script, sometimes in instinct—and always with consequences that ripple across galaxies. This series blends sizzling sci-fi romance with pulse-pounding adventure, bringing together interstellar warriors, unlikely heroines, and bonds that transcend planets, species, and logic.

Read more ...

Each story orbits around a central spark: two beings from vastly different worlds navigating cultural clashes, language barriers, and the weight of destiny. But these aren’t just tales of otherworldly attraction—they’re layered, character-driven journeys where survival, sovereignty, and identity hang in the balance. The world-building is immersive without being overwhelming, striking a careful balance between futuristic tech and raw, emotional stakes.

The tone shifts between action-packed tension and deeply personal intimacy, exploring what it means to truly connect—whether through a forced proximity crash landing, a marriage of political necessity, or an instinctual alien claiming that rewrites both hearts and rules. If you’re drawn to slow-burn passion ignited in the vacuum of space, or fierce heroines who hold their ground even on foreign soil, this series delivers the perfect blend of heat, humor, and heart.


Cosmic Mates consists of eight books. The current recommended reading order for the series is provided below.

Escape Clause (Cosmic Mates #1)
⧗ 8.34 / 3
Help Wanted: Wife (Cosmic Mates #2)
⧗ 8.34 / 3
Kiss of Steel: A Cyborg Romance (Cosmic Mates #3)
⧗ 8.50 / 2
Kiss of Fury: A Cyborg Romance (Cosmic Mates #4)
★ 9.00 / 1
Double Take (Cosmic Mates #5)
★ 9.00 / 1
Double Bind (Cosmic Mates #6)
★ 10.00 / 1
Alien Heir (Cosmic Mates #7)
★ 10.00 / 1
Alien Spare (Cosmic Mates #8)
★ 10.00 / 1

Reviews and Comments

07/11/2025
Chelsea K avatar
Chelsea K
698 books, 522 reviews, 228 posts
★★★★★★★★★★ 10 / 10

This is the first book in the newest duet of the Cosmic Mates series and I loved all the new characters in it. This set includes two sets of siblings, human twin sisters Kismet and Karma as well as the alien princes Jaryk and Falkor. This book focuses on Jaryk & Kismet but their siblings provide a lot of support as well as humor and I look forward to seeing how they get together in the next book. The epilogue was also amusing and provided an unexpected surprise from Jaryk and Falkor's mother.

Cosmic Mates #07 - #08 DuetAlien Heir (Cosmic Mates #07): Prince Jaryk & KismetAlien Spare (Cosmic Mates #08): Prince Falkor & Karma

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

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