44 Votes
The magic semen
A young straight boy it is transformed due to the semen of a big and strong worker
Topics: Hairy men, Cum, Sci-Fi, Transformation
GayDemon's gay porn library: in this story category you can find erotic Sci-Fi stories involving sex in futuristic settings.
A young straight boy it is transformed due to the semen of a big and strong worker
Topics: Hairy men, Cum, Sci-Fi, Transformation
Epilogue. Thank You All for Reading!!
Topics: Romance, Fantasy, Sci-Fi, Magic
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.
Topics: Big Dick, Jock, Boypussy, Sci-Fi, Magic, Body Modification, Straight to Gay
In 1972, NASA launched a secet mission. It would affect those involved for decades afterward.
Topics: Anal Sex, Fiction, Sci-Fi, Oral & Blowjobs, Sex
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.
Topics: Handjob, Bullies, Sci-Fi, Oral & Blowjobs, Violence
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.
Topics: Feet, Cum, Armpits, Sci-Fi, Oral & Blowjobs, Kissing
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.
Topics: Sci-Fi, No Sex, Nudity
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.
Topics: Fiction, Sci-Fi
Ex spook Alister needs a alibi and knows where to find it
Topics: Anal Sex, Big Dick, Interracial, Sci-Fi, Violence
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".
Topics: Milking, Sci-Fi, Aliens
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!!
Topics: Fiction, Romance, Relationship, Fantasy, Sci-Fi, Magic
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.
Topics: Anal Sex, Fiction, Sci-Fi, Twink, Oral & Blowjobs, Sex
Barely recovered from their first erotic encounter, our Lightship Keepers find themselves reinvigorated by an unexpected guest.
Topics: Masturbation, Edging, Sci-Fi
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 ...
Topics: Anal Sex, Sci-Fi, Oral & Blowjobs, Body Modification, Fucking
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 ...
Topics: Anal Sex, Bondage, Sci-Fi, Oral & Blowjobs, Body Modification
A normal straight guy turned into a muscle jock, receiving a price for his obedience.
Topics: Muscle, Straight Men, Hypnotized, Transformation, Dumb Jock
LAST CHAPTER! Make sure you stick around for the epilog at the end.
Topics: Romance, Relationship, Fantasy, Sci-Fi, Magic
Nathan and Sergeant Chance are pregnant again. But will they get back together?
Topics: Relationship, Sci-Fi, Male Pregnancy
Agent Diego P. Fidel is exposed to double-crossing agent and a time travel supervillain.
Topics: Latin Men, Forced, Armpits, Mystery & Crime, Sci-Fi, Superhero, Co-worker, Twink, Age Difference, Rape
Duke transforms into Apex to fight crime and fuck guys, but stumbles across a drug deal.
Topics: Muscle, Public Sex, Big Dick, Interracial, Jock, Drugs, Superhero, Transformation, Big Balls, Bubble Butt, Spit Roasting, Cum Denial
College freshman Zach stumbles across a strange store in his local mall.
Topics: College, Cum, Fantasy, Bareback, Sci-Fi, Magic
A continuation of the converted "The Superior Machine" by steveabc.
Topics: Muscle, Sci-Fi, Superhero
Nate finally succumbs to the temptations of visiting a local rubber store...but ends up getting much more personal and hands on treatment than he was expecting, leading to a far more permanent solution.
Topics: Poppers, Forced, Rubber, Sci-Fi, Transformation, Mind Control, Master & Slave, Submission
All Eric wanted was a romantic getaway with his husband, but he gets stuck in a time loop, forced to repeat the same sex over and over again. He tries to escape his reality and quickly realizes that things are much weirder than he initially thought.
Topics: Breeding, Milking, Bareback, Sci-Fi, Rape, Jockstraps, Horror
Len, a would be Transwoman, gets his wish thanks to some alien technology when he and his lesbian girlfriend Liz, a would be Transman, get to swop bodies. The only problem is they are now 'tied' to each other, yet still both Gay and Lesbian -- unless together. As others also swop, things get complicated ...
Topics: Anal Sex, Bondage, Transgender, Rubber, Sci-Fi, MTF, FTM, Latex
The Cave - Charles staggered to his feet and winced at the pain in his side. He pulled his hand away seeing it covered in his blood. He needed medical attention and soon, otherwise he would be like his fellow soldiers, another statistic to this horrible war.
Topics: Fiction, Sci-Fi, Sex, Halloween
After an emergency evacuation, Andros is the only man left at Sky, the first and only orbital station ever built by the mankind. 'Sky is falling', the orbital station is doomed, and Andros with it, but he doesn't care, as no one will miss him. But... is it so?
Topics: Anal Sex, Romance, First Time, Sci-Fi, Virgin, Oral & Blowjobs, Illustrated
Waking with a hangover things are not quite as they were.....
Topics: Drugs, Sci-Fi
When Captain Niall Coventry's life partner is captured by the Danog and transformed into a latex sex slave, their lives are changed forever. But the Danog have made a fatal mistake, Niall has himself transformed and leads a special task force of the rescued sex slaves to sabotage the Danog's home bases and bring to an end their ravages of human colonies ...
Topics: Bondage, Rubber, Sci-Fi, Transformation, Sex, Aliens, Fucking, Latex
He was at the busstop. He was so hot my dick started getting hard in my pants and he was flagging me down! This black guy had everything! And everything I WANTED when I saw how big his crotch was! But he couldn't be gay, could he? He had missed his bus out of town and needed a place for the night and was willing to pay a few bucks! Maye we could work out a deal! I told him 'no problem-bo!'
Topics: Black Men, Arab, Anal Sex, Muscle, Straight Men, Big Dick, Interracial, Sci-Fi, Oral & Blowjobs, Ass to Mouth, Turkish