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 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) 447 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).

9.3 (75) 6810 33 Min Comments

Keeping Secrets (ch. 5)

By Grant 26 Jul 2024

Another Chapter, another conflict requiring the team to respond.

9.9 (21) 1200 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) 383 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) 1699 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) 652 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 (63) 2731 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) 3814 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) 762 6 Min Comments

Expected Result (ch. 6)

By Swallow Your Lightsaber 29 May 2024

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.

7.7 (4) 400 17 Min Comments

New World Order

By rasun 19 May 2024

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.

7.3 (16) 1642 2 Min Comments

The Only Miracle

By taitanium1988 4 May 2024

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.

4.4 (6) 3238 30 Min Comments

The Rut (ch. 5)

By Boy Mercury X 27 Apr 2024

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.

9.7 (26) 3049 29 Min Comments

01040113

By Romo 16 Apr 2024

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.

8.8 (46) 2567 5 Min Comments

The New Terrans (ch. 18)

By PCLatex 9 Apr 2024

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 ...

9.8 (8) 559 10 Min Comments

Pleasurable Pain

By Boldie 5 Apr 2024

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.

8.8 (25) 5690 21 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) 804 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 (72) 12589 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) 3042 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) 315 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) 4183 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.

8.9 (89) 13294 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 (144) 7371 11 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 (20) 2716 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) 994 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.

7.5 (7) 1270 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 (51) 3974 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.....

7.9 (58) 6790 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) 1286 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 (58) 5661 5 Min Comments