Becoming Wesker's Experiment (ch. 2)
By Layla 24 Jun 2025
The inside of the torn building where Alpha was bringing Chris to was as horrific as the hunk remembered it to be during his failed first mission.
Gay Science Fiction Stories
GayDemon's gay porn library: in this story category you can find erotic Sci-Fi stories involving sex in futuristic settings.
Debt Camp (ch. 2)
By Local 22 Jun 2025
Gen-Alpha influencer John Magee is seized for sky-high debt, he’s thrust into Amazon’s punishing “Debt Camp,” where every flex is livestreamed, for a price he might never pay off.
The Human Bearer (ch. 16)
By Daemon D. Hart 21 Jun 2025
Riordan is going head to head with High Commander Kanto Vai, and ends up being punished for his disobedience of the rules.
A Long Way Home
By Grant 17 Jun 2025
They were finished with their mission into deep space and heading back, when something went wrong.
Trapped
By trappedinthecl0set 16 Jun 2025
In future dystopia, gay man is forced to suck straight dick.
The Last Neighbors (ch. 4)
By DaddyDom 13 Jun 2025
He began to rub my skin, his fingers tracing the lines of my muscles. His touch was light, almost feather-like, but it sent shivers down my spine. I watched as his hand moved higher, his fingers brushing against the sensitive skin of my inner thigh. My breath hitched in anticipation, my body arching into his touch.
The Stereotype Ray
By astrolub 10 Jun 2025
A cat burglar steals the fabled Stereotype Ray and tests it on an unsuspecting townsman.
Serum 3379 (ch. 3)
By ShawnTVWrites 27 May 2025
Julian learns the effects of the drug trial and how ther was a mix up that has changed him potentially forever.
Bill and Me and the Heliopause
By Petr-Johan 24 May 2025
Two gay men find that the rest of their lives will be spent together in space.
Haven P. 1 (ch. 3)
By ShawnTVWrites 20 May 2025
The team from Haven meet the survivors of the Earths Cataclysm, learn and prepare for war.
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Submission at the Oasis
By Zander Saldana 2nd 12 May 2025
Space Marine Jareth is lost after a battle wipes out his platoon. He learns to submit and how he's going to serve in a new life. This is campy smut with space marines, tentacles, and twist I hope you like.
The Academy (ch. 3)
By Rochin 26 Apr 2025
Akeem introduces Eron to a new friend and they have a gay old time. Eron loses his anal virginity.
In Seclusion
By Grant 14 Apr 2025
Gustave wanted to a place he could live as he choose. A place he didn't have to worry about what others thought. No one could guess to what lengths he would go to get it.
A Soldier's Duty (ch. 2)
By B David Ethan 8 Apr 2025
Dan cruises the base's gym for a pump and finds way more than he bargained for.
Alex, Hive Mother
By Alex Aims 7 Apr 2025
Alex thought John was just a hot new coworker—until a steamy stockroom encounter revealed John’s alien secret. Now trapped in a pulsating hive, Alex births a monstrous brood, his body no longer his own.
James the Space Diplomat
By Oliver V. Cub 7 Apr 2025
It is thousands of years after Earth discovers space-travel. Sex has become an important tool for an intergalactic diplomat. This story follows our stocky space cadet, James, on his visit to an alien planet. When the planet's leader takes a liking to him, will his can-do attitude leave a good impression for Earth?
Slavery in Albion
By Mattspank 26 Mar 2025
A fantasy about a Great Britain which has legalised slavery for men
The Driftwalker
By Torsten 24 Mar 2025
The spaceship’s tiny cabin forces intimacy.
Parasite Edging Arena
By PhilipLane 19 Mar 2025
In this TV show, human beings volunteer as a battleground for two unique parasites. One inhabits the testicles, avoiding the host's ejaculation at all costs. The other attaches to the host's penis, trying to enforce orgasm. These parasites engage in a struggle using their human hosts, with only one able to emerge victorious.
Chosen by Aliens
By Staffido 15 Mar 2025
Muscular men were captured by aliens just to be dairy cows
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Alphas: School for Muscle Men (ch. 2)
By RedJulian 25 Feb 2025
Ricky meets his new master at the school for Alphas.
The Alien Plant
By sweetcum 22 Feb 2025
My car stopped working in the middle of a forest. After getting lost in the woods I encountered a weird plant which had an unsettling plan for me.
Time Traveler Bob Relives His Past Sexual Experiences
By G-Shock Bobby 25 Jan 2025
Riding his bike in the Mojave Desert, Bob encounters beings not of this world. Bob learns he is both immortal and can travel back in time where it's possible to both relive and alter past sexual experiences.
Slavery is future: 2050
By Sadist Daddy 3 Jan 2025
Alot charged till 2050, the earth is in natural crisis and only man are left on earth, it all happened because of climate change. Read to know how compulsory slavery saved earth
Aliens Having Sex With Men-First Encounter
By Del Crane 2 Jan 2025
Alien Men Develop a Taste for Human Cum.
Cerule (ch. 10)
By Draven Moorcock 15 Dec 2024
As they sail under enemy fire, Jake, known on Cerule as Par, takes command and guides the small crew of the ship Skylark through peril toward safety.
It's 2044 - Most Gays Have Three Partners
By Del Crane 9 Dec 2024
So three Big Cocks to Suck and get Fucked By
Whats' To Cum - Haven
By ShawnTVWrites 6 Dec 2024
Haven, is a post-apocalyptic, sci-fi, story I've been working on. This is just a sample from Chapter 1. It'll be debuting soon. It is heavily inspired by The 100, Stargate, and other "Let's rebuild society" films, tv shows, and books. I hope you enjoy this snippet and look forward to reading it as much as I've enjoyed coming up with the story and
A Final Orgasm by Dr. Phallus
By Del Crane 2 Dec 2024
To Survive, The Human Race Needed Cock Suckers.
Dave Dickinson - Semenologist
By Del Crane 27 Nov 2024
I work for an obscure government agency-the Semenological Survey. Healthy male cocks means a healthy country-your taxes at work.
About our gay science fiction stories
As an online source of gay erotica since 1999, GayDemon Story Library is your ultimate destination for the best adult science fiction with sexy gay guys and aliens you can enjoy for free. The vast collection of gay sex stories we host here has something for everyone who likes reading about a future where humans and species from other galaxies experience different types of sex. Download for free any short story or porn novel you like. Authors upload their stories in this section, so we ask you to respect their copyright. If it happens that you want to post a story you don't own the copyright for, do so only if you have the permission given by the author. To show your appreciation for writers and their hard work, don't forget to leave a vote and comment.