You saved her from the crashed spaceship in your cornfield, the cut, shortstack, blue, hairy alien girl. She has become indebted to you and promises to take care of you for the rest of your life. She does chores around the house, waters the crops and most importantly feeds you. Her milk contains all the nutrients you need to thrive. The aphrodisiac inside make you horny beyond belief. She offers her body to you. Her anatomy is very similar to humans, so you know exactly what to do. Her belly quickly grows with your offspring and her milk becomes richer, granting you more stamina and vitality, almost as if prepping you for what is to come next. A week later she gives birth to an exact copy of herself, with engorged breasts and thicker bushes of hair. She offers her milk to you aswell. Her milk grants you a second pair of genitalia. Unable to contain your lust, you take both of them at once, while they make out with eachother. You see them growing again, becoming curvier, with silky soft hair sprouting in the best of places. Like natural fertility goddesses, they both give birth to another exact replica, who both offer you their bountiful cream. All four of them thank you for bringing their species back from near extinction and take their rightful place, impaled on your 4 hard as steel rods, and the cycle repeats endlessly.
(This feels like another one of those prompts where the asker clearly has talent and I feel like you should definitely write your own short stories, you absolutely have potential! You've basically written the entire thing yourself just there! I can only continue it to its logical conclusion, as you've defined everything very well, from backstory to the action that takes place initially, later on, the consequences...)
Saving an alien fertility goddess must have been the luckiest day of my life. Every day she makes it worth it, from drinking her milk, to helping breed her to save her population from going extinct. I imagine a horde of 'her' as every time she gives birth, she produces exact copies of herself, almost like she underwent some full body mitosis of some kind. It's like they're a near hive mind too, they all seem inclined to thank me, even if I only saved their mother, or grandmother, or whatever generation we are in now.
Her planet used to have trillions of other blue shortstack, hyper reproductive women like herself, it was such a densely populated planet that it was shocking to see there was only one survivor left after all that happened, or at least the only one I could find.
Their milk must have magical, alien effects on my body that allow me to control my own sexual organs much more efficiently than I would otherwise, as handling dozens, then hundreds of different cocks, having to multitask so much I end up being a one person orgy, one person breeding machine that pumps endless amounts of cum and clones into the new mothers, always striving to give them back what they had, even if it ended up making me even more freakishly huge and giving me even more endowments. With them all being clones of her, none of them actually share my DNA, as it seems that they used to reproduce by having a semen like fluid be inserted into their womb, activating it and allowing it to, through immense amounts of energy, produce a clone of themselves. My cum, there was just so much of it, and it was so rich that it easily cleared that energy cost, making every pregnancy quicker and more efficient the more I grew.
By the time I end up with a trillion cocks though, I feel like there's no point in stopping there... Their population levels went from nearly 0 to a top, record level due to my breeding sessions. I still make sure to breed the girl I saved first and foremost whenever I fuck them, which is pretty much all the time now...
Even if they're all clones of that girl, I still feel a stronger attachment to her, and one day, I'll make sure to shove all trillion of my dicks inside her womb, to give her the biggest, most pleasurable orgasm ever, literally, bloating her to ungodly proportions worthy of a proper fertility goddess. <3
