Quads of Alpha S: Similar romance series

Aldebarian Alliance

by Dianne Duvall

4.37 · 89 ratings

romance · book · vampires · paranormal · audiobook · alpha-mc · female-mc · action-adventure · aliens · fiction · sci-fi · adult · space · humor · military · first-contact · steamy · urban-fantasy · suspense · contemporary

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Interstellar Brides Program

by Grace Goodwin

4.07 · 330 ratings

paranormal · aliens · sci-fi · romance · fiction · adult · steamy · action-adventure · military · book · other-world · audiobook · shapeshifters · genetic-engineering · insta-love · vampires · futuristic · contemporary · polyamory · alpha-mc

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Galactic Conspiracies

by Rob Colton

4.00 · 41 ratings

action-adventure · paranormal · alpha-mc · space · romance · book · steamy · mlm · sci-fi · military · adult · futuristic · lgbtq · aliens · fiction · abuse · children · insta-love · violent-conflict · fated-mates

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Claimings

by Lyn Gala

4.17 · 63 ratings

mlm · steamy · book · romance · audiobook · paranormal · aliens · fiction · lgbtq · age-gap · adult · sci-fi · space · friends-to-lovers · action-adventure · slow-burn · violent-conflict · military · angst · invasion

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Pykh

by Eileen Glass

4.00 · 48 ratings

sci-fi · adult · polyamory · military · lgbtq · action-adventure · aliens · fiction · omegaverse · paranormal · survival · book · steamy · romance · mlm · humor · space · dystopia · audiobook · slavery

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Interstellar Service & Discipline

by Morgan Hawke

4.00 · 48 ratings

sci-fi · adult · futuristic · fiction · aliens · paranormal · space · book · steamy · romance · mlm · space-opera · dark · sexual-assault · military · lgbtq · action-adventure · alpha-mc · slavery · bdsm

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World of Kalquor

by Tracy St. John

3.99 · 258 ratings

steamy · adult · sci-fi · aliens · fiction · book · paranormal · romance · space · futuristic · polyamory · space-opera · action-adventure · alpha-mc · dystopia · mlm · reverse-harem · military · space-travel · dark

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Sci-Regency

by J.L. Langley

3.90 · 88 ratings

sci-fi · adult · historical · industrial-era · lgbtq · futuristic · fiction · book · romance · mlm · violent-conflict · military · war · action-adventure · regency · aliens · paranormal · steamy · royalty · age-gap

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Interstellar Brides: The Colony

by Grace Goodwin

4.26 · 108 ratings

fiction · paranormal · cyborgs · romance · book · steamy · sci-fi · adult · shapeshifters · vampires · aliens · action-adventure · audiobook · genetic-engineering · insta-love · military · futuristic · violent-conflict · war · contemporary

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Dark Space

by Lisa Henry

4.02 · 42 ratings

book · military · adult · violent-conflict · sci-fi · space-opera · aliens · fiction · action-adventure · futuristic · lgbtq · war · dystopia · space · angst · mlm · romance · dark · mystery · audiobook

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Lady Blue Crew

by Lynn Hagen

3.88 · 74 ratings

futuristic · lgbtq · aliens · fiction · sci-fi · adult · romance · steamy · book · shapeshifters · mlm · paranormal · action-adventure · space · military · alpha-mc · abuse · animals · cats · time-travel

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Saving Caeorleia

by Alicia Nordwell

3.96 · 26 ratings

military · adult · dark · sci-fi · aliens · fiction · action-adventure · futuristic · lgbtq · dystopia · mlm · abuse · romance · book · steamy · violent-conflict · space-opera · war · family · space

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An Uncommon Whore

by Belinda McBride

3.79 · 34 ratings

steamy · book · romance · mlm · sci-fi · adult · futuristic · aliens · fiction · suspense · abuse · slavery · lgbtq · action-adventure · paranormal · space · amnesia · royalty · space-opera · dark

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