Second Species Trilogy: Similar series
Paradox
by Rachel Bach
4.05 · 140 ratings
science fiction · mystery · aliens · military · futuristic · war · strong heroine · urban fantasy · warrior-heroine · length-medium · bodyguard-hero · shapeshifters · m-f · behind-doors · young adult · fighters · dystopian · open-door · pirates · slow burn
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Vrisha Warriors
by Olivia Riley
4.03 · 151 ratings
m-f · science fiction · aliens · futuristic · non-human-hero · dual-pov · explicit-open-door · fighters · length-medium · military · caretaking · from hate to love · competent heroine · forced proximity · monsters · alpha male · torture-mcs · abuse · cold hero · tortured hero
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Ghost Hunters
by Jayne Castle
4.12 · 675 ratings
futuristic · suspense · urban fantasy · mystery · contemporary · aliens · dual-pov · length-medium · magic · paranormal · fantasy · open-door · science fiction · witches · vampires · m-f · humor · angels · shapeshifters · demons
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Aldebarian Alliance
by Dianne Duvall
4.19 · 140 ratings
dual-pov · vampires · science fiction · aliens · futuristic · non-human-hero · m-f · sweet heroine · humor · multicultural · sweet-hero · urban fantasy · strong heroine · abuse · gifted heroine · dangerous heroine · warrior-heroine · explicit-open-door · military · torture-mcs
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Captured Earth
by A.G. Wilde
3.87 · 130 ratings
aliens · explicit-open-door · science fiction · length-medium · creative-anatomy · strong heroine · dystopian · military · suspense · vengeance · dual-pov · alpha male · shapeshifters · fighters · non-human-hero · height-difference · from hate to love · first-person-pov · war · fated-mates
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Celta's Heartmates
by Robin D. Owens
3.98 · 341 ratings
futuristic · science fiction · length-medium · magic · fated-mates · aliens · contemporary · m-f · vampires · shapeshifters · paranormal · fantasy · urban fantasy · class difference · tortured heroine · demons · witches · angels · grovel · suspense
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The Xenith Trilogy
by Chani Lynn Feener
4.00 · 49 ratings
young adult · other-man-woman · love triangle · futuristic · from hate to love · dystopian · length-medium · science fiction · aliens · suspense · behind-doors · mystery · fantasy · high-school · royalty · legends & fairy tales · new adult · friends to lovers · paranormal · arranged marriage
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The Prime Chronicles
by Monette Michaels
3.84 · 54 ratings
futuristic · science fiction · length-medium · aliens · m-f · alpha male · military · anal sex · pirates · non-human-hero · breeding · erotica · length-novella · fated-mates · cruel hero
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The Lost Fleet
by Sarah Hawke
4.35 · 46 ratings
aliens · science fiction · harems · length-medium · military · explicit-plentiful · futuristic · breeding · war · m-f-f · male-pov · poly · anal sex · pregnancy
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Space Lords
by Michelle M. Pillow
4.19 · 36 ratings
aliens · futuristic · psychics · science fiction · demons · length-short · non-human-hero · length-medium · pirates · shapeshifters · contemporary
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Anguis Defenders
by Stephanie West
3.98 · 37 ratings
science fiction · aliens · length-medium · alpha male · non-human-hero · military · fated-mates · futuristic · creative-anatomy · m-f · strong heroine · fantasy · abduction · new adult · explicit-plentiful · angst · third-person-pov · forced proximity · captive · rape-mc
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Kindred Tales
by Evangeline Anderson
4.16 · 49 ratings
humor · science fiction · non-human-hero · aliens · length-medium · futuristic · paranormal · fantasy · explicit-plentiful · shapeshifters · from hate to love · bdsm · caretaking · fated-mates · time travel · abuse-non-mc · dual-pov · anal sex · pregnancy · possessive hero
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Alien Marshals & Mates
by Julie K. Cohen
4.34 · 40 ratings
length-medium · science fiction · fated-mates · paranormal · aliens · humor · length-short · fantasy · monsters · friends to lovers · explicit-open-door · pregnancy · historical · alpha male
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Black Girls Off World
by Nikki Clarke
4.42 · 18 ratings
science fiction · length-medium · aliens · poly · menage · black-mc · african-american · m-f-m · suspense · reverse harem · explicit-plentiful · military · multicultural · length-short
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Exchanged Power
by Ivy Barrett
4.16 · 36 ratings
science fiction · length-medium · bdsm · aliens · m-f-m · poly · menage · spanking · reverse harem · paranormal · captive · abuse · dub-con · anal sex · dark · alpha male · possessive hero · non-human-hero · military · futuristic
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Zyrgin Warriors
by Marie Dry
4.05 · 20 ratings
science fiction · suspense · futuristic · aliens · length-medium · paranormal · fantasy · length-short · non-human-hero
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Rogues of the Zathari
by Stella Frost
4.31 · 16 ratings
science fiction · length-medium · fantasy · aliens · monsters · post-apocalyptic · forced proximity · western
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Warriors of Galatea
by Lauren Esker
3.87 · 15 ratings
science fiction · futuristic · length-medium · fantasy · shapeshifters · aliens · paranormal · tortured hero · sweet-hero · military · multicultural · virgin hero · non-human-hero · slavery · strong heroine · erotica
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Warriors
by L.P. Peace
4.33 · 18 ratings
science fiction · fantasy · length-short · aliens · length-medium · futuristic · reverse harem · military · past-sexual-abuse · non-human-hero · sassy heroine · bisexual · shy-hero · abuse · fated-mates · independent heroine · tall-heroine · alpha male · black-mc · slavery
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The Jekh Saga
by H.E. Trent
4.36 · 14 ratings
science fiction · length-medium · aliens · futuristic · explicit-plentiful · poly · alpha male · age difference · from hate to love · other-man-woman · strong heroine · rape · sassy heroine · reverse harem · m-m · friends to lovers · sweet-hero · erotica · love triangle · m-f
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Over the Top Galactic Heroes
by Kai Lesy
4.46 · 13 ratings
length-medium · science fiction · paranormal · aliens · fantasy · pregnancy · new adult · abduction · m-f-m · suspense · menage · poly · contemporary
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Haalux Empire
by Hattie Jacks
4.38 · 16 ratings
aliens · science fiction · multicultural · length-medium · rape-mc · birth-control-non-con · human-trafficking · humor · explicit-open-door · abduction · first-person-pov · futuristic · fated-mates · military · non-human-hero · career professional · length-short · alpha male · m-f · past-abuse
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Chronicles of the Maca
by Mari Collier
4.17 · 6 ratings
aliens · science fiction · length-medium · contemporary · futuristic · military · mystery · western · historical · length-long · historical western
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