Sine Qua Non Cycle: Similar series
The Four Horsemen
by Laura Thalassa
3.96 · 1695 ratings
angst · dystopian · torture-mcs · non-human-hero · explicit-open-door · audiobook · m-f · alpha male · death · fantasy · forced proximity · age difference · urban fantasy · strong heroine · 100-plus-years-mmc · first-person-pov · cruel hero · dark · cold hero · war
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The Dark Duet
by C.J. Roberts
4.05 · 557 ratings
abduction · bdsm · dark · abuse · suspense · alpha male · contemporary · erotica · angst · tortured hero · rape · dual-pov · anal sex · latinx-mc · possessive hero · bondage · cruel hero · forbidden love · teenage-fmc · m-f
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Mates of the Domini
by Talia Rhea
3.88 · 262 ratings
aliens · fated-mates · futuristic · standalone-first · science fiction · explicit-plentiful · m-f · breeding · non-human-hero · abduction · creative-anatomy · dual-pov · multicultural · third-person-pov · super rich hero · male-pov · length-long · in-his-30s · height-difference · found-family
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Wren's Song
by Addison Cain
3.74 · 217 ratings
dark · dystopian · rape · fantasy · explicit-plentiful · poly · menage · paranormal · omegaverse · cruel hero · bdsm · abduction · cliffhanger · dub-con · reverse harem · abuse · science fiction · erotica · alpha male · m-f
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Stanton
by T.L. Swan
4.25 · 137 ratings
contemporary · explicit-plentiful · length-long · super rich hero · suspense · alpha male · erotica · angst · forbidden love · second chances · new adult · friends to lovers · other-man-woman · standalone-first · first-in-series · cheating · audiobook · cliffhanger · secret-relationship · dark
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All or Nothing
by C.C. Gibbs
4.00 · 181 ratings
super rich hero · contemporary · erotica · audiobook · length-medium · office · angst · bad boys · independent heroine · first-in-series · bdsm · alpha male · standalone-first · length-long · new adult · possessive hero · cliffhanger · shy heroine · cruel hero · pregnancy
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Grabbed
by Lolita Lopez
3.92 · 144 ratings
military · bdsm · science fiction · aliens · futuristic · erotica · length-short · alpha male · length-medium · standalone-first · virgin heroine · suspense · men in uniform · m-f · standalone · insta-love · non-human-hero · breeding · possessive hero · spanking
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Interstellar Brides: The Virgins
by Grace Goodwin
4.08 · 85 ratings
futuristic · aliens · audiobook · science fiction · non-human-hero · military · fated-mates · spanking · alpha male · gifted heroine · shapeshifters · bondage · breeding · praise-kink · possessive hero · anal sex · dual-pov · fetish · independent heroine · humor
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Purgatory Masters
by Eliza Gayle
3.99 · 67 ratings
bdsm · contemporary · audiobook · erotica · m-f · suspense · curvy heroine · first-in-series · standalone-first · alpha male · length-short · super rich hero · young adult · length-medium · men in uniform · bondage · military · single-mother · angst
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Planetary Submissives
by Amber Kell
3.62 · 58 ratings
erotica · m-m · length-novella · magic · bdsm · queer · aliens · futuristic · anal sex · contemporary · first-in-series · slavery · standalone-first · paranormal · science fiction · fantasy · military · alpha male · angst · royalty
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DEEP
by Jaine Diamond
4.08 · 38 ratings
explicit-plentiful · bdsm · erotica · futuristic · science fiction · length-medium · first-in-series · standalone-first · military · age difference · length-long · new adult · cliffhanger · fantasy
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Orion
by Cathryn Cade
3.54 · 51 ratings
shapeshifters · futuristic · erotica · science fiction · aliens · length-novella · contemporary · fantasy · length-short · first-in-series · alpha male · standalone-first · paranormal · m-f · suspense
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The Survivors
by V.L. Dreyer
3.87 · 37 ratings
futuristic · dystopian · science fiction · standalone-first · multicultural · audiobook · first-in-series · horror · length-long · paranormal · length-medium · suspense · young adult · christian · contemporary · fantasy
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Love In Handcuffs
by Ashley Spector
3.40 · 34 ratings
erotica · bdsm · length-novella · contemporary · suspense · super rich hero · shy heroine · standalone-first · first-in-series · m-f
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Their Captive Bride
by Julia Sykes
3.93 · 31 ratings
suspense · menage · contemporary · poly · mafia · m-f-m · dual-pov · vengeance · abduction · dark · arranged marriage · bdsm · length-novella · erotica · cliffhanger · rape · from hate to love · bondage · love triangle · standalone-first
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Human++
by Dima Zales
3.96 · 26 ratings
science fiction · audiobook · futuristic · length-long · first-in-series · standalone-first · length-medium · mystery · fantasy · superheroes · humor · new adult · suspense
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Beastmen of Ator
by Kaitlyn O'Connor
3.39 · 18 ratings
aliens · science fiction · length-short · futuristic · bdsm · first-in-series · audiobook · poly · standalone-first · erotica · abduction · time travel · dystopian · shapeshifters · reverse harem · non-human-hero · m-f-m · menage
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The Beast Masters
by Mandy M. Roth
3.65 · 23 ratings
werewolves · erotica · shapeshifters · menage · paranormal · fantasy · length-novella · audiobook · men in uniform · futuristic · standalone-first · military · first-in-series · bdsm · science fiction · aliens · demons · m-f-m · poly · witches
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Eternal Lovers
by Marie Hall
4.13 · 15 ratings
paranormal · length-medium · fantasy · erotica · standalone-first · first-in-series · science fiction · futuristic · witches · audiobook · urban fantasy · magic · standalone · vampires
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Alien Daddy
by Stella Shelton
3.61 · 23 ratings
science fiction · bdsm · erotica · length-novella · age play · aliens · first-in-series · standalone-first · audiobook · daddy-kink · explicit-open-door · m-f · caretaking · masc-dom · abduction
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Love's Way
by E.L. Beth
4.17 · 21 ratings
angst · abuse · erotica · contemporary · dark · explicit-plentiful · cheating · alpha male · bdsm · length-long · other-man-woman · cruel hero · sassy heroine · from hate to love · slut-shaming · suspense · hurt-comfort · betrayal · m-f · possessive hero
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Bayou Bound
by Sidney Bristol
4.00 · 16 ratings
erotica · contemporary · multicultural · bdsm · suspense · first-in-series · length-long · black-mc · m-f · standalone-first · length-novella · usa · indigenous-mc · men in uniform · north-america · louisiana · length-short
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Erotic Alien Sci-Fi Short Stories
by Beatrix Steam
3.71 · 14 ratings
length-novella · science fiction · first-in-series · erotica · standalone-first · paranormal · audiobook · aliens · fantasy · humor · mystery · bdsm · monsters · m-f · breeding · horror · f-f · bisexual · vampires · queer
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Dirty Rockhard Billionaire
by M.I. Rosegold
4.29 · 7 ratings
contemporary · erotica · length-long · first-in-series · super rich hero · age difference · forbidden love · suspense · standalone-first · mature couple · urban · explicit-plentiful · length-epic · fantasy · bdsm · alpha male
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