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.

Alphas: School for Muscle Men (ch. 2)

By RedJulian 25 Feb 2025

Ricky meets his new master at the school for Alphas.

8.8 (42) 2521 7 Min Comments

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.

7.5 (30) 2341 6 Min Comments

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.

7.2 (8) 404 12 Min Comments

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

7.0 (10) 1356 10 Min Comments

Aliens Having Sex With Men-First Encounter

By Del Crane 2 Jan 2025

Alien Men Develop a Taste for Human Cum.

6.5 (19) 2407 9 Min Comments

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.

9.4 (9) 330 4 Min Comments

It's 2044 - Most Gays Have Three Partners

By Del Crane 9 Dec 2024

So three Big Cocks to Suck and get Fucked By

5.1 (11) 1462 4 Min Comments

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

7.9 (8) 634 4 Min Comments

A Final Orgasm by Dr. Phallus

By Del Crane 2 Dec 2024

To Survive, The Human Race Needed Cock Suckers.

6.5 (16) 1638 3 Min Comments

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.

6.4 (14) 640 3 Min Comments

Brad - The Greatest Fucker

By Del Crane 16 Nov 2024

He Fucks like a Pro.. and he's a robot.

7.6 (23) 1745 2 Min Comments

Invention of Insatiable Desires: A Dr Stanford Story (ch. 5)

By Maxim R. Mayerling 16 Nov 2024

A couple of months after their transformation, Eric and Jim are back to talk to Dr Stanford, he's happy with their progress and invites them to customise their bodies for their own desires which the pair agree.

8.8 (16) 1002 11 Min Comments

Cock Sucker in Outer Space

By Del Crane 15 Nov 2024

Sucking Cock In Outer Space

8.1 (14) 899 8 Min Comments

Cave Men - Where Gay Sex Started

By Del Crane 14 Nov 2024

It's another early morning, 2040, Professor Phallus holds a sex lecture.

7.0 (24) 1301 3 Min Comments

The Robo-Lips Sex Machine

By Del Crane 10 Nov 2024

Best New Product-2030, the Robo-Lips Sex Machine for a Horny Cock.

7.4 (7) 597 4 Min Comments

Professor Phallus' 2040 Gay Sex tube lecture

By Del Crane 27 Oct 2024

Let's take  a closer at the Male Sex machine

8.0 (6) 794 4 Min Comments

Billy And The Sex Clones (ch. 2)

By Del Crane 26 Oct 2024

About once a week one of the Clones would wander in at night, after a piss break, and in the dark, fuck any mouth that presented  itself. Joe and Jim, one after another would get both their mouths fucked by a thick rock-hard Clone cock-and get a load of narcotic Cum

7.7 (13) 731 6 Min Comments

Guass and Grendel

By Demon Monster 6 Oct 2024

A warframe gay sex story between Guass and Grendel

9.5 (6) 424 26 Min Comments

Black Tiger - Hypnotrapped

By Ebonart 22 Sep 2024

Superhero Black Tiger falls under the hypnotic sway of a gang lord with greater ambitions than just our hero's hunky body.

9.6 (16) 2988 17 Min Comments

Gantu's Beach Day

By Demon Monster 9 Sep 2024

Gantu goes to the beach and has a fun time

8.8 (6) 1942 17 Min Comments

The Encounter (ch. 3)

By Jaradon 5 Sep 2024

Two men bond over an alien encounter

8.6 (11) 1161 6 Min Comments

The Mona Lisa Mystery

By Del Crane 26 Aug 2024

Aliens had come to Earth in the year 2100, having found one of our wandering space probes. These were local aliens in our  quiet,obscure corner of the Milky Way-not any of the dominant ruling alien races.

9.1 (4) 437 11 Min Comments

Dossier of Mpreg Cases

By Ganteng 18 Aug 2024

This is an opening summary of when the world was suddenly hit by a strange phenomenon where new male subspecies emerge, the Alpha (the man of the men) and Beta (the man who can get pregnant).

9.2 (74) 6460 33 Min Comments

Keeping Secrets (ch. 5)

By Grant 26 Jul 2024

Another Chapter, another conflict requiring the team to respond.

9.9 (21) 1150 113 Min Comments

Clonehood (ch. 2)

By Sukumar 22 Jul 2024

Leo is an employee of ABC company, finds himself in between police, mafia and a large level corruption, in a furiastic fucking clone society.

8.5 (7) 374 7 Min Comments

Imardull And His New Mortal

By Demon Monster 3 Jul 2024

Hello I just wanted to go ahead and start a small little thing going with this so hope you enjoy

8.8 (3) 1651 22 Min Comments

Krogans Traditional Arena

By Demon Monster 3 Jul 2024

In the heart of the bustling marketplace on the volatile planet of Tuchanka, the air grew thick with anticipation as the crowd parted to reveal a makeshift arena. Two towering krogans, their skin gleaming with a sheen of oil, stepped into the ring. The larger of the two, a seasoned warrior named Grahk, flexed his muscles.

9.1 (8) 626 14 Min Comments

2131 CE

By Grant 17 Jun 2024

The last rocket is about to leave Earth, the last for any hope of evacuation from the dying planet. (updated version)

9.3 (62) 2709 88 Min Comments

Male World Order

By Danny 5 Jun 2024

In a highly authoritarian, male dominated future America, 19 fresh high school graduates undergo a battery of mental and physical tests to learn their place in the male hierarchy and secure their futures

9.1 (18) 3666 28 Min Comments

The teddy bear which granted me my wishes (ch. 6)

By mr_crimson 2 Jun 2024

As the main character got an interesting reward he explores it and learns a lot more about the whole world.

9.6 (4) 736 6 Min Comments