Ty soon had a great idea. For a long time he'd been fascinated with sci-fi and aliens and stuff, and thought it was a shame humans would probably never make contact with real aliens. Pretty soon, he knew how he wanted this scenario to play out.
He would create a race of aliens that came from a dying world. Their species was down to only a few of its kind left, and they knew full well that if they didn't do something drastic, they would die out. But their scientists came up with a brilliant idea. They discovered a planet called Earth, the only one in its solar system that seemed to support life. It would be a perfect home.
There was one slight problem- it was covered in bipedal, somewhat intelligent creatures called 'humans'. For a bit of delicious irony, the aliens figured they'd try putting through some of the white ones, whose ancestors (and some of their stupider contemporaries) thought they were the smartest, best kind, through the same process they'd put their fellow kinds of human through- making those humans submit to, and act like, them.
The slight problem, of course, was that there were billions of them. That was far too many for them to fight. So what would they do? Well, humans had a weakness of sorts. Lots of them were obsessed with how nice their reproductive process felt, so it would be easy for these aliens to co-opt reproductive pleasure to breed. They would convert humans to part of their alien culture, and then have those humans breed their own kind for them. The stupid divide humans had between ones with the reproductive role of producing and carrying offspring would be cast aside when they came, too. From now on, the breeders would be these aliens and the bred would be humankind.
Ty was getting a hard-on just thinking about it all. But what form would these aliens take on? Would they be tentacle beasts that used their appendages to ensnare and fuck humans until their holes bore life? Impossibly strong and handsome creatures with enticing pheromones and huge cocks who could physically force humans to mate with them? Impossibly beautiful creatures with huge soft breasts and butts who would be irresistible to humans, and make them mate until their genetics could be reconfigured to carry the alien genome? Creatures beyond human perception that just pleasured you until you turned into an alien spawner?
Ty wasn't sure. All those options sounded really enticing. Or maybe they'd be something totally unlike any of those. He decided to wish for those aliens to come to life, and his subconscious would decide what form they took...
(A/N: if you have other alien ideas, go ahead and write them!)