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.

The Reptold Invasion

By rubber collector 2 Apr 2024

Alien invaders come to planet earth to enslave the humans

7.8 (7) 883 3 Min Comments

The Block (ch. 4)

By Adam 12 Mar 2024

Cracks began to show more clearly though, at first it was little things. Diego took me to the cafe he took me to that first day, where he’d lay me back on the table and fucked me not caring who saw. The look on the girl’s face told me that wasn’t the last time he’d done that in the cafe, and that I wasn’t the only one. She knew as well as I did that survival meant doing things we didn’t want to, making alliances to stay alive was all ...

9.9 (8) 735 11 Min Comments

New bull (ch. 3)

By Staffido 22 Feb 2024

The jock finally understood what he was born for. His only value in this life is to produce sperm and be a milking bull....

9.1 (65) 11424 11 Min Comments

Into Another World (ch. 13)

By Cloudboy91 13 Feb 2024

Jeremy is invited back to a party hosted by Trent and Nico.

9.7 (17) 2845 10 Min Comments

Secrets Among the Stars (ch. 2)

By Ottie Otter 7 Feb 2024

Jayson awakes to a klaxon alarm ringing through out the station. An evacuation order has been called, but what's happening?

9.6 (10) 300 14 Min Comments

Texas Slave Auction (ch. 13)

By Slave Bear 5 Feb 2024

An exploration of what happens to one slave after the end of his service and his attempt to reenter society.

9.3 (18) 3652 21 Min Comments

Milking factory

By Staffido 3 Feb 2024

Matthew gives a tour of the milking factory where kidnapped and bound muscle men are milked.

8.8 (80) 11216 5 Min Comments

Fruit of the Tree

By Local 1 Feb 2024

An FBI agent investigates an abandoned farm, on federal property, of a modified plant, that is suspected of being used to grow marijuana, and possibly linked to the disappearance of several young me.

9.1 (138) 6741 14 Min Comments

Attahachee County (ch. 2)

By Double Dee 1 Jan 2024

Noa's brothers are counting on him, but will he rise to the occasion? (This chapter is a quick setting setter before we reenter Cornell properly in the next one. Check back for it tomorrow.)

8.2 (19) 2560 7 Min Comments

Cumspiracy (ch. 2)

By Mr B Queer 10 Dec 2023

Chris's boss invited him him to go see some cum hungry aliens at his house... at midnight. But is it just a ploy to get some one on one bouncy bouncy time with him?

9.1 (10) 938 6 Min Comments

A Hero in the making

By Prenum 8 Dec 2023

A long running story which will be following Alister, a soon to be developed superhuman, in a new world of powers.

7.4 (6) 1228 14 Min Comments

Alien Abduction by Beast Men

By MontanaBiGuy 25 Nov 2023

Story of a recently divorced man getting reintroduced to sex with men. And aliens!

9.2 (49) 3607 22 Min Comments

Alien Re-erection

By Baryon 4 Nov 2023

Three Americans taken captive aboard an alien vessel. Kyle and Jackson prove easy enough to milk for their seed. But, the aliens encounter a problem with Ben.....

7.8 (56) 6280 5 Min Comments

Dystopian City

By BJJL 19 Oct 2023

Two slaves are purchased to preform at an inner city club. One of them is about to get kidnapped by and young man.

7.6 (11) 1187 8 Min Comments

The magic semen

By Young Bottom Boy 30 Sep 2023

A young straight boy it is transformed due to the semen of a big and strong worker

7.4 (53) 5174 5 Min Comments

Stolen Love (ch. 58)

By Sam Stefanik 5 Sep 2023

Epilogue. Thank You All for Reading!!

9.3 (10) 305 8 Min Comments

Friendly Transformations

By RichardButtstuff 27 Aug 2023

A group of college wrestlers leave a match and head back home, defeated and hateful in many ways. A supernatural entity appears and turns their hate and their bodies into much better forms. Dubcon start, happy-for-now ending.

7.5 (26) 5582 28 Min Comments

The Final Frontier

By Grant 24 Jul 2023

In 1972, NASA launched a secet mission. It would affect those involved for decades afterward.

9.2 (62) 1971 50 Min Comments

The Kray' Lon

By Swallow Your Lightsaber 21 Jul 2023

As peace is, for once, reigning on earth, at the opposite end of the galaxy a huge battle is being fought that will change everything. A member from one faction escapes to earth and the only survivor of a doomed ship; The Crown Prince of the Kray' Lon Empire chooses to follow them here for revenge.

6.7 (5) 470 14 Min Comments

The BJ Cafe (ch. 8)

By SnarfulBuddy 4 Jul 2023

A fully confident Tor returns to the BJ Cafe to meet with Simmy. We catch up with Beeb and his brothers on the Zudo home-world. Beeb tries something he never thought he would ever try.

9.4 (5) 451 18 Min Comments

Lunar Laboratory

By TeamStilinski 30 Jun 2023

In the sterile environment of the Lunar Laboratory, personal connections are frowned upon, and an air of professionalism must always be maintained. When the Head Researcher encounters the mysterious Subject 135, it soon brings the structure surrounding their day-to-day lives into question. This is a new series hopefully with a comical undertone.

9.1 (12) 452 6 Min Comments

Painting with Rainbows

By Plamenarski 8 Jun 2023

Once upon a time, in the vibrant city of Crestville, there lived a young artist named Alex. With an extraordinary talent for capturing emotions on canvas, Alex's paintings were known to touch the hearts of those who beheld them. The city's art scene had never seen such brilliance before.

6.6 (8) 181 2 Min Comments

A Busy Night

By Prenum 29 May 2023

Ex spook Alister needs a alibi and knows where to find it

8.0 (16) 1954 6 Min Comments

Seed

By TakenAndTickled 25 May 2023

After the fall of the humans to the unknown alien race, young men such as Thomas are captured and taken to harvesting plants to be milked of all their nutritious "Seed".

8.7 (67) 9825 16 Min Comments

From Whence I Came (ch. 48)

By Sam Stefanik 24 May 2023

LAST CHAPTER!! Thank you for reading! Thank you for still being here! In this chapter, Church introduces his family to Solum then takes his leave for some well-deserved quiet time with Shawn. Stay tuned after the chapter for the Epilogue and an announcement. THANKS FOR READING!!

9.8 (14) 273 26 Min Comments

The Chronicles of Ahr (ch. 3)

By JuxepeAlbi 13 May 2023

Gay sex fantasy, boys captured from spaceship wind up as slaves on a continent with no females, their semen affecting the planet's residents, Ahrgons, as a rejuvenating elixir. Fantasy, some humor.

9.3 (15) 553 12 Min Comments

Sex And The Single Spaceman (ch. 3)

By OldGayFox 25 Apr 2023

Barely recovered from their first erotic encounter, our Lightship Keepers find themselves reinvigorated by an unexpected guest.

9.3 (8) 602 7 Min Comments

Strange Encounter: Permanent Effects (ch. 15)

By PCLatex 1 Apr 2023

I somehow forgot to post this final chapter a while ago ... Felix, Gary, Lukas and their masters help Felix master his 'new' limbs and adjust to his new life. Finally Felix is reunited with the man he thought had abandoned him, but was key to his rescue ...

9.5 (10) 1504 10 Min Comments

An unplanned life (ch. 23)

By PCLatex 29 Mar 2023

The final Chapter in this story. Poal, Alexei, Mede and Condoin are reminded that while they are not aging as rapidly as their unmodified contemporaries, there will come a time when they have outlived those that know, love and support them ...

9.8 (19) 834 10 Min Comments

Turned into a muscle jock

By Oxin 14 Mar 2023

A normal straight guy turned into a muscle jock, receiving a price for his obedience.

5.1 (35) 6781 4 Min Comments