Cosmic Mates · #7

Alien Heir

Name: Alien Heir
Rating: 10 (1 reviews)
Author: Cara Bristol

Cara Bristol

Science Fiction Alien Romance Romance

10.0 / 10

1 rating

1 review

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

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Published: July 21, 2025

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Cosmic Mates

The series

Full series details →

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 full series description

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.

#1 · 2024Escape Clause

#2 · 2024Help Wanted: Wife

#3 · 2024Kiss of Steel

#4 · 2024Kiss of Fury

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Reader reviews

1 review

What Risingshadow readers think about this book

Chelsea K2025-07-11

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 Duet
Alien Heir (Cosmic Mates #07): Prince Jaryk & Kismet
Alien 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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