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 Human Bearer (ch. 13)

Story by Daemon D. Hart

13 Jul 2024 156 Readers comments 15 Min Read

Riordan learns about alien birth from Kyle and later crashes on a Xeno meeting of the highest rank.

Topics: Sci-Fi, Male Pregnancy, Aliens


Cerule (ch. 5)

Story by Draven Moorcock

10 Jul 2024 345 Readers comments 6 Min Read

The after math of battle, finds our hero taking stock of his situation. A new handsome acquaintance with a big cock becomes his sworn servant.

Topics: Fiction, Big Dick, Military, Sci-Fi


Imardull And His New Mortal

Story by Demon Monster

3 Jul 2024 584 Readers comments 26 Min Read

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

Topics: Big Dick, Sci-Fi, Big Balls, Cumflation


Krogans Traditional Arena

Story by Demon Monster

3 Jul 2024 257 Readers comments 17 Min Read

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.

Topics: Rough Sex, Wrestling, Fantasy, Sci-Fi, Oral & Blowjobs, Aliens


The Encounter (ch. 2)

Story by Jaradon

23 Jun 2024 803 Readers comments 7 Min Read

A man gets medical help after an alien encounter

Topics: Anal Sex, Forced, Doctor, Sci-Fi, Aliens


2131 CE

Story by Grant

17 Jun 2024 2329 Readers comments 106 Min Read

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

Topics: Fiction, Sci-Fi, Sex

11 Votes

Male World Order

Story by Danny

5 Jun 2024 1493 Readers comments 34 Min Read

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

Topics: Sci-Fi, CMNM, Discipline, Domination, Coming of Age, Dystopian

4 Votes

Expected Result (ch. 6)

Story by Swallow Your Lightsaber

29 May 2024 273 Readers comments 21 Min Read

Surprises are pleasant, especially these kinds, Stan and Jeremy finally get some reinforcements. The LT makes it back, and a US Naval Vessel can make supply drops and deliver a passenger. Jeremy discovers a couple of anomalies in their medical exams.

Topics: Anal Sex, Sci-Fi, Oral & Blowjobs, Submission, Aliens, Restraints

11 Votes


Story by SUKUMAR

26 May 2024 709 Readers comments 9 Min Read

Leo, an employee for a powerful company find hiself in desire for a clone to satisfy him and slowly uncover the mystries of local mafia, big political games and a clone civil war.

Topics: Rough Sex, Big Dick, Sci-Fi

10 Votes

The Purple Rubber Outfits

Story by rubber collector

21 May 2024 693 Readers comments 6 Min Read

A new sex club opened up at the next town over and the human males were floxing to get to the club but once you enter the club you are not the same ever again

Topics: Rubber, Discipline, Aliens, Horror

12 Votes

New World Order

Story by rasun

19 May 2024 739 Readers comments 2 Min Read

The Rise of the Nub Virus - In the world of "Black Order," a once peaceful existence was shattered by the arrival of a mysterious meteorite carrying a devastating payload - the Nub Virus.

Topics: Interracial, Sci-Fi, Raceplay

2 Votes

The Skreel

Story by rubber collector

19 May 2024 128 Readers comments 2 Min Read

Rubberlaxin creature shares symbotic relationships with another alien lifeform known as a SKREEL Rubberlaxin comes to planet earth to find human female breeding host for the SKREEL FEMALE

Topics: Rubber, Sci-Fi, Aliens, Horror

7 Votes

The purple rubber outfit

Story by rubber collector

16 May 2024 452 Readers comments 5 Min Read

A boy finds a purple rubber outfit and falls under the control of the alien entity so the alien can feed.

Topics: Rubber, Sci-Fi, Aliens, Horror

6 Votes

The Only Miracle

Story by taitanium1988

4 May 2024 1894 Readers comments 36 Min Read

A weird pandemic swiped the world...Jimmy opened the door to a young man and didn't realize his fate will flush to a sea change.

Topics: Bondage, Forced, Milking, Religion, Sci-Fi, BDSM

17 Votes

The Rut (ch. 5)

Story by Boy Mercury X

27 Apr 2024 1488 Readers comments 34 Min Read

In the conclusion to The Rut, all storylines collide, the mystery of Sunday Stu is revealed, the pregnant jock bros each get what they most desire, and so does everyone else.

Topics: Jock, Breeding, Sci-Fi, Bromance, Male Pregnancy

37 Votes


Story by Romo

16 Apr 2024 1916 Readers comments 6 Min Read

As he walks to the Collection chamber, he looks at the others, like him, in this immense room. Shaved. Naked. Muscular. His body, like theirs, is at its peak of specimen perfection. The machines have seen to this perfection. As each in this room share his approximate age. He is in his twentieth year of existence. And he does what he is told to do.

Topics: Muscle, Sci-Fi, Shaved, Nudity

7 Votes

The New Terrans (ch. 18)

Story by PCLatex

9 Apr 2024 308 Readers comments 12 Min Read

With the rebellion over, the mutant-droids are at last able to live the life so long denied them. Felix and Jorge celebrate with their first lovemaking in their natural form ...

Topics: Bondage, Rubber, Sci-Fi, Oral & Blowjobs, Body Modification, Fucking, Robot

17 Votes

Pleasurable Pain

Story by Boldie

5 Apr 2024 2783 Readers comments 26 Min Read

Aman, Moh and Dan are three young man, who volunteered for a experiment in which they get paid highly. At first, the staff prepare them seperately in different room, where Aman get injected with a blue serum, Moh and Dan injected with red serum. After that, they enters in room and locked for 48 hrs. Soon, as minutes passes, they start feeling lust, horny and arousal feelings towards each other. ...

Topics: Threesome, Romance, Sci-Fi, Male Pregnancy, Boyfriends, Straight to Gay, Fucking

7 Votes

The Block (ch. 4)

Story by Adam

12 Mar 2024 591 Readers comments 13 Min Read

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 ...

Topics: Fiction, Romance, Sci-Fi, Dystopian, Love

47 Votes

New bull (ch. 3)

Story by Staffido

22 Feb 2024 7291 Readers comments 13 Min Read

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

Topics: Muscle, Bondage, Forced, Edging, Milking, Sci-Fi, Master & Slave, Cum Control

17 Votes

Into Another World (ch. 13)

Story by Cloudboy91

13 Feb 2024 2161 Readers comments 12 Min Read

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

Topics: Anal Sex, Muscle, Rough Sex, Big Dick, Group Sex, Alpha Male, Sci-Fi, Power Bottom, Big Ass

8 Votes

Secrets Among the Stars (ch. 2)

Story by Ottie Otter

7 Feb 2024 254 Readers comments 17 Min Read

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

Topics: Fiction, Sci-Fi, No Sex

14 Votes

Texas Slave Auction (ch. 13)

Story by Slave Bear

5 Feb 2024 2441 Readers comments 26 Min Read

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

Topics: Chastity, Big Dick, Sci-Fi, Master & Slave, Submission, Control

60 Votes

Milking factory

Story by Staffido

3 Feb 2024 6750 Readers comments 6 Min Read

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

Topics: Muscle, Bondage, Forced, Milking, Sci-Fi, Master & Slave

128 Votes

Fruit of the Tree

Story by Local

1 Feb 2024 4903 Readers comments 17 Min Read

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.

Topics: Muscle, Abduction, Military, Milking, Sci-Fi, Transformation, Power Bottom, Amputee, Submission, Body Worship, Supernatural, Dubcon

16 Votes

Attahachee County (ch. 2)

Story by Double Dee

1 Jan 2024 2071 Readers comments 9 Min Read

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.)

Topics: Fiction, Chastity, Abduction, Sci-Fi, No Sex

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.

We take gay sci fi erotica seriously!

This sci-fi fiction section is based on entries generated by users. We don't guarantee what content you will find when reading these gay erotic stories, as we don't read them prior to publication. We always ask authors to follow our guidelines and not post unsuitable content in our story section.