X. Callisto

Biography

X. Callisto writes monster, alien-abduction and sci-fi/horror themed erotica. They are an avid monster fucking enthusiast and have spent their life savings on the strangest silicon toys money can buy.

Join X. Callisto's newsletter to catch promotions, NSFW exclusive cover art, and sneak peaks at the stuff that's too spicy for Amazon ;)

Where to find X. Callisto online

Books

Ganged by Aliens
Series: Used by Aliens. Price: $2.99 USD. Words: 4,860. Language: English. Originally Published: June 16, 2024 by X. Callisto. Categories: Fiction » Erotica » Science Fiction, Fiction » Erotica » General, Fiction » Erotica » Horror
How many giant alien cocks can I take before it's over? - I woke up after being abducted by aliens and quickly found out that I'd been stolen away from Earth to become the free-use sex doll for a group of alien warriors. These alien brutes barely speak English and don't know the meaning of "no".
Hucow Apocalypse: Taken
Series: Hucow Apocalypse, Book 1. Price: $2.99 USD. Words: 5,770. Language: English. Originally Published: April 21, 2024 by X. Callisto. Categories: Fiction » Erotica » Science Fiction, Fiction » Erotica » General, Fiction » Erotica » BDSM, Fiction » Erotica » Paranormal
Beautiful Bethany is captured and forced to join the hucow herd of Kane, a terrible and cruel overlord. She is powerless to resist the men of his gang, who are eager to take their turns using her until she accepts her place as a submissive hucow. In no time, Beth will be fucked and milked into submission, forced into servitude as human cattle for the hungry hoards of survivors.
Used in the Dormitory
Series: Free Use University, Book 1. Price: $2.99 USD. Words: 5,330. Language: English. Originally Published: November 18, 2023 by X. Callisto. Categories: Fiction » Erotica » General, Fiction » Erotica » BDSM
Welcome to Free Use University … Where all female students are free-use f*ck toys for any man! So, it's my first year of college at Free Use University … The problem is there was a mix up and now I'm stuck in the boys' dorm - which means they can use me as their personal s*x toy whenever they want. How am I going to study with all these d*cks in my mouth?-
Used By My Step-Dad
Series: Free-Use Incest Stories, Book 4. Price: $2.99 USD. Words: 4,800. Language: English. Originally Published: November 15, 2023 by X. Callisto. Categories: Fiction » Erotica » General
We were supposed to be having a fun family vacation, but when mom gets food-poisoning, I end up having to hang out at the resort with my step-dad all weekend. My step-dad has been eyeing me since I turned eighteen last week and now with my mom out of the way, he can finally claim me as his free-use step-daughter.
Used By My Twin Brothers
Series: Free-Use Incest Stories, Book 3. Price: $2.99 USD. Words: 4,740. Language: English. Originally Published: November 15, 2023 by X. Callisto. Categories: Fiction » Erotica » General
I've been eighteen for a whole month and no man has come to claim my virginity. Thankfully, I have two perverted older twin brothers who are more than happy to use their free-use privileges and pop my cherry with some double penetration. I'm ready for my first time - and I guess I'll be keeping it in the family … for now.
Used By My Daddy
Series: Free-Use Incest Stories, Book 1. Price: $2.99 USD. Words: 4,360. Language: English. Originally Published: November 14, 2023 by X. Callisto. Categories: Fiction » Erotica » General
It's no secret that my daddy has been horny since mom left. He wants me and, one week after my big 18th birthday bash, he's finally ready to make his move. I've been saving myself for him, knowing that he is the only man I want to use my fertile young body.
Used By My Brothers
Series: Free-Use Incest Stories, Book 2. Price: $2.99 USD. Words: 4,650. Language: English. Originally Published: November 14, 2023 by X. Callisto. Categories: Fiction » Erotica » General, Fiction » Erotica » BDSM
I didn't want my first free-use experience to be with my two older brothers, but they aren't giving me a choice. On the night of my 18th birthday, mom leaves me alone with my two horny brothers. Now that I'm available for free use - they won't take no for an answer.
Sacrificed to the Zombies - A Fertile Sex Toy for the Horde
Price: $2.99 USD. Words: 6,560. Language: English. Originally Published: October 26, 2023 by X. Callisto. Categories: Fiction » Erotica » Science Fiction, Fiction » Erotica » General
Vivi has survived the zombie apocalypse for nineteen years. One night, when her camp is attacked, she is left for dead. At the mercy of the zombies, she tries to escape, only to be used again and again for their sexual pleasure.
Ravaged by the Bull
Price: $2.99 USD. Words: 11,410. Language: English. Originally Published: October 24, 2023 by X. Callisto. Categories: Fiction » Erotica » Science Fiction, Fiction » Erotica » General, Fiction » Horror, Fiction » Erotica » BDSM
Pippa's life changes forever when her car breaks down on a country road. She thinks she safe when she's picked up by Tom and Jessy, a father and son farmer duo that offer her a place to stay for the night. Little does she know that the farm is holding dark secrets and the two men have no intention of letting her leave.
Bearing the Alien's Spawn
Price: $2.99 USD. Words: 9,210. Language: English. Originally Published: October 15, 2023 by X. Callisto. Categories: Fiction » Erotica » Science Fiction, Fiction » Erotica » General
When ace star fleet pilot Heidi McMaster crash lands on an unknown planet, she needs to find a way off and fast, or else the local creatures will make her their personal egg incubator. An alien promises to help her get back to Earth on one condition - carry his eggs until they hatch and save his dying tribe. Will Heidi offer her body for this once in a lifetime experience?
Trapped in the Alien's Nest
Price: $2.99 USD. Words: 7,790. Language: English. Originally Published: October 5, 2023 by X. Callisto. Categories: Fiction » Erotica » Science Fiction, Fiction » Erotica » General
Emily has dedicated her life to studying alien species, especially Velutipes-Genesis. She finds herself trapped in the nest of the biggest specimen she has ever seen, and it has only one thing on its mind - sharing its genetic material. Will she be able to carry the aliens' eggs and find the key to this elusive alien species? Or will its giant tentacles prove to be too much for her to handle?
Chosen for the Alien Breeding Program
Price: $2.99 USD. Words: 6,720. Language: English. Originally Published: October 2, 2023 by X. Callisto. Categories: Fiction » Erotica » Science Fiction, Fiction » Erotica » General
When Lily is kidnapped during a hiking trip by sexy humanoid aliens and told she has been chosen for a very special program needed to save the alien race. She surrenders to them completely and watches with amazement as her body changes to care for alien offspring. Will she be able to carry the aliens' eggs and save their species?

X. Callisto's tag cloud