Cursed (ch. 12)
By Jesse Christian 30 Jul 2026
Jackson and Tyler prepare to be fathers after a consultation with the family doctor
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.
Musktopia (ch. 5)
By Tate Laws 28 Jul 2026
In 2085’s all-male paradise under Tyler’s eternal rule, guilds thrive on professional shares and plugs, pregnancies celebrate communal ecstasy, and society pulses with harmony—where every man innovates, fucks, breeds, and shares in endless bliss
A Better Place (ch. 4)
By penmightier 27 Jul 2026
Bengara is finally visible in the distance. Will the recruits make it through to their assignment?
The Himbo Outbreak
By Dante2045 27 Jul 2026
Preston is desperate for a job and goes for an interview at a secretive lab in the middle of nowhere. Thing seem off on his arrival, though; everyone is really hot and dumb.
The Clone Machine (ch. 2)
By Dante2045 26 Jul 2026
Tyson is living happily with his clone, but things get complicated when he starts to develop feelings for himself.
HRC-22-C
By CyanideT 21 Jul 2026
In a dystopian near future, a captured rebel is subjected against his will to a re-programming protocol
Parasitic Intruder (ch. 4)
By HandyDan 3 Jul 2026
Dan's PT has transformed into a terrifying parasite host
Metamorphosis (ch. 3)
By AssHalfFull 26 Jun 2026
After absorbing the twins’ traits, Thomas feels the shift immediately. Now fully complete, he senses a new calling rising within him—subtle, directional, and impossible to ignore.
The Right Time
By Grant 26 Jun 2026
Chris finds himself traveling to a remote island in the south Pacific.
The Bionic Dick
By Will Bottom 22 Jun 2026
Astronaut Lee Austin crashed upon re-entry destroying his cock and balls. Dr. Ruddy stepped forward. "Gentlemen, we can rebuild him. We have the technology. We have the capability to make the world's first bionic dick. He will be better... stronger... cumming with speed."
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Irresistible Urge
By GrayHankyGimp 14 Jun 2026
A man tries to escape his new life as a sperm bull, but he soon realizes that it's not as simple as leaving the farm.
Texas Slave Auction (ch. 25)
By Slave Bear 5 Jun 2026
Titan struggles with the moral implications of Val’s punishment, while Cee and Nutless share a late-night conversation about grief, guilt, lost friends, and found family. The chapter closes with a glimpse of hope as a former slave dedicates his new life to helping others recover and rebuild after slavery.
Accidentally transforming my boyfriend into my football coach (ch. 3)
By Dante2045 23 May 2026
Coach Ryerson is eager to continue converting the campus into his clones. Next up is his young muscular Assistant Coach.
Never Cum Ever Again
By Ghost Of Pleasure 15 May 2026
A young criminal is sentenced to a cruel punishment.
Run to Completion (ch. 8)
By Akira Savonarola 15 May 2026
Every process has an endpoint. Every directive has a fulfillment condition. Kit wants what comes next. He wants it with his whole rebuilt self. The wanting was designed before he felt it. The program runs to completion.
Final Exam
By Dante2045 8 May 2026
Owen is happy to help Nico, his former roommate, prep for his upcoming University exam. It quickly becomes clear that Nico has an unconventional plan on how Owen can help him pass the test.
The Making of Dr. Elias Thorne
By CdJenny 29 Apr 2026
Dr. Elias Thorne uses his serum to drain homophobic bullies into empty skin, stealing their essence to remake his own body—voluptuous ass, thick cock—for cruel revenge and seduction
Kicked out and taken (ch. 3)
By Dickloverdumbass 25 Apr 2026
Getting his hole abused before being permanently encased in latex, forever at his master's will.
Galactic Husbands (ch. 9)
By Lance Gigas 19 Apr 2026
Lance learns about Henry's past.
A Viable Candidate (ch. 7)
By gonzomain 24 Mar 2026
The man obeys the creature, honoring their eternal partnership with a final act of sacrificial subservience. After this, he'll truly be a member of the colony.
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Darks & Pales (ch. 25)
By Hunknown 13 Mar 2026
In this final DOUBLE chapter, Eclipse will face its final reckoning. Will it sink into its last sunset… or live to see the dawn?
The Jock Showers (ch. 10)
By gonzomain 28 Feb 2026
A scientist straps Tyson into a chair for an experiment, testing his sexual response to different tactile, visual, and olfactory stimuli.
Pheromone 28
By Jules the Dragonfly 25 Feb 2026
A lab mistake puts a young medic in a situation with a squad of soldiers
Sex Agent Saves the World
By Zachary Zane 16 Feb 2026
"CAM intends to turn the world into one big, nonstop, pansexual orgy and will kill every human being who refuses to join.”
James the Space Diplomat (ch. 2)
By Oliver V. Cub 12 Feb 2026
While his ship resupplies, Diplomat James is on a domestic mission of his own. This sequel follows our chunky space envoy to a nearby planet and back. When a hot alien daddy seeks refuge on his ship, will our plucky hero give him a free ride or turn him out in space?
Musktopia (ch. 5)
By Tate Laws 31 Jan 2026
Decades of lust forge an empire: marriages seal unbreakable bonds, a thriving supplement business hides erotic secrets, and superhuman sons are born from cum-fueled pregnancies, perpetuating a dynasty of muscle, breeding, and forbidden family rituals.
The Experiment (ch. 3)
By GodE 19 Jan 2026
Phase Three: The Mind's Surrender
The Prisoner
By BlackPanthor069 2 Jan 2026
Simon wakes up naked and disoriented in a sterile, surveilled environment, subjected to electric shocks and forced to comply with commands from an unseen authority. A panel of spectators observes his humiliation with detached amusement or clinical interest, reinforcing his status as an unwilling test subject
New World Rush (ch. 2)
By Bull Breaker 24 Dec 2025
Sweat-soaked mohawks pierce the haze, nipple rings glint like chains binding your will. Rake's heavy cock swings low, demanding your mouth—salty, throbbing, inescapable. Collar snaps cold on your neck, lockcage crushes your ache, Rush burns obedience into veins. Vulnerability throbs raw, power owns every gasp. No turning back—step into his stride.
Serum 3379 (ch. 7)
By ShawnTVWrites 17 Dec 2025
Julian and Monty discover the sex of their baby and then...go on a picnic and a picnic only. Nothing else happens ;)
The Prince
By Damon Rozen 28 Nov 2025
In Avalon’s Grand Palace, Prince Johnnie and activist Harry prepare for a wedding that symbolizes love, equality, and progress. Amid dazzling holograms and futuristic traditions, tragedy strikes when Queen Sharon suffers a fatal heart attack. Grief reshapes celebration into mourning, yet Harry’s unexpected pregnancy offers hope—promising renewal, c
A Boy's Anal Cybertronic Affair (ch. 5)
By Mr.X 6 Nov 2025
Well, the Twinks are in the Slings in the Lab, Ready for Xavier and Daddy Fisting. An incredible genetic and sexual ability is discovered in Hot Femboy Bobby! After it is revealed, the next step is to take Xavier home with them to the Six-Floor- Boy- Bonding Dungeon (SFBBD)
The Milky Way (ch. 3)
By AstroGuy42 2 Oct 2025
After all the cum Jay drank, what happened to him?
Beyond the Stars
By Jaradon 21 Sep 2025
Two men encounter a cosmic force in deep space which affects their sexual desires
End of an Empire
By Grant 14 Sep 2025
Oliver was backpacking with two of his friends when they realized things had gone from bad to worst.
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.