X rated sci-fi books

Anima Academy

Ice Planet Holiday: A SciFi Holiday Alien Romance (Ice Planet Barbarians)

How to Train Your Human Omega: An MM Alien SciFi Romance

Duty's Reward:

Catgirls from Outer Space: A Harem Sci-Fi Action Adventure for Men

Alien Attachment: A Steamy Scifi Romance

Waking Wild

Contract to Mate: Sci-fi Possessive Monster Romance Book in Space (Smutt Books Short Alien Romance 1)

Barbarian's Treat

The Bride Contract

Barbarian's Prize

Alien Mate