"You've brought here to help us conquer your world, and many others to come".
What? What was this creature talking about? Are they going to brainwash you or something similar so you turn your back on your homeworld? Of course it's not a perfect place, but it's still your home! And you won't sacrifice it for anything at all.
"WHAT? You can't be serious, there's no way to make me help with that, this is nonsense!"
"You see, you need to use some imagination, we won't directly use YOU... We'll rather use your genetic material. Basically, we'll use your human genes to enhance our weapons, and adapt them better for the world they're going to conquer."
You stay still in disbelief, and before you can argue back, you're suddenly wrapped in tight metal rings that snap around your body and joints, holding you in place, and with some sort of traction beam, you're moved across the other side of the ship, just before letting you fall down a circular hatch, right into seemingly endless darkness.
You fall for a solid ten seconds before hitting something. To your surprise, you're still alive, although the fall left you hurt, dizzy, and confused.
It seems you've fallen in some kind of gooey, slimey structure, black in color. It's warm and sticky to the touch, and you soon discover that the walls and the floor are covered in the same substance.
Getting off the structure and jumping on the gooey floor, the ground soon shakes, and you barely distinguishing something getting closer to you from the shadows.
In front of you, a massive, giant silhouette is coming, shaking everything with each step.
Intimidated, you run back and bump into a wall, and much to your surprise, out of it a set of tentacles extrude and hold you in place. A thin pair of them, however, sink into your body and inject you some kind of liquid.
It doesn't take long for the strange substance to take effect, as you feel a strange bloating sensation all over your body, but the strangest sensation comes later when a huge, fleshy tentacle comes down from somewhere in the ceiling, opening like some sort of meaty tube that song engulfs you, covering your head and everything down to your waist.
You try to scream, but the skin of the tube is dense and thick, from the inside, it feels slimey, soft, and drooling, and it begins to massage your whole body.
You notice the bloating feeling again, as you feel the tube tight from the inside; what's really happening is that you're expanding, your body taking a wider, cylindrical shape that bulges and widens with every tug from the tube, your whole body starts growing in all directions, becoming thick and tight.
Soon enough, your body has taken a large round cylindrical shape, and you feel something run through your veins and in your tissue.
You feel your head and your feet getting apart from each other, your body lengthening considerably.
Quickly enough, your arms become constricted by the fleshy surroundings, and they start to recede into your torso, as if they were melting and adding more girth to your long, meaty body.
The next change is extremely unpleasant as you feel your bones being crushed by the fleshy tube, leaving you with a flaccid body.
A ridge forms in the middle of your body, running from top to bottom, leaving your body segmented in two meaty sections that pulse with your heartbeat.
After this, you feel the fleshy tube stretch further down until it covers your legs. Your genitalia starts to melt with your body, but the genetic material within somehow moves, being pumped by your veins right into your legs, which lose their bones much like the rest of your body, and start plumping up, becoming spherical, round, and soft.
The most drastic change comes from your head, which slowly starts flattening, your neck seamlessly melding with your torso, matching it's girth. You lose all hair, and your nose and ears recede, disappearing completely from your expanding flesh.
Your skull softens, and becomes of a similar tissue as the rest of you, just before flattening and gaining a ring of ridges around it.
The rest of your body gains slight ridges, and your flat head begins growing fleshy tentacle-like appendages, making it look like some sort of sea anemone.
You close your eyes as they begin disappearing within your flesh, the only feature visible is your mouth, which loses all it's teeth, it's gums, and it's tongue, leaving behind only a long tube that runs straight down.
With these final changes, you're left with a long, fleshy, flaccid body that flops against the meaty tube you're encased in.
From behind, you can feel your anus widening, and gaining similar anemone-like tentacles than your head, and you feel them slithering their way into some kind of holes in the ground, plugging into them like some kind of electrical appliance, and you feel a surge of energy and nutrients soon enter you.
With this, you no longer need your organs, which are getting replaced with tender cock meat, valves and veins that soon begin to harden with your increased blood flow.
The fleshy tube you're encased in starts massaging your body all over, but it doesn't end there, you feel yourself constricting against it, growing and expanding. The tube struggles to hold you in, so it begins to widen to hold your new size and mass. The veins in your body engorge as you keep being stimulated by this fleshy surrounding, and all you can think of it's the pleasure of it, and the release you need. Your testicles get plumper, expanding outwards as your sperm count increases millionfold.
The slit that used to be your mouth starts spitting out a transparent liquid that coats the insides of the tube, which thrusts up and down, stimulating you.
After a few minutes like this, your growth and your stimulation proves to be way too much for you to handle, and you're rewarded with a powerful orgasm that takes over your whole body. Your mouth spits out a gooey, green, glowing substance that is gladly sucked away by the tube, with a bit of it running down your body. You're flaccid once again.
Once it's job is done, the tube let's you go, and your new massive cock body falls to the ground, shaking the whole room with its mass. With the tube gone, it's clearly visible your flesh is tender, gooey, and pitch black, with your veins and tentacles glowing slightly with a green coloration.
Your size is absolutely massive, you feel huge, sluggish, and like you're reaching way further than you ever did.
After this, you feel the tremors you sensed before returning, but this time you're not afraid.
Somehow, you can see with your tentacles, and you see a giant, kaiju-sized creature emerge from the darkness. It's like a freak mix between an ant, a mantis, and a theropod dinosaur. It's standing on a pair of legs which look like a dinosaurs, with a bony tail coming out of it. Its body is covered in a chitinous exoskeleton, full of ridges, spikes and valves. It's bony, ridged arms end up in massive claws, and its head is vicious, threatening, with no eyes or features save for it's huge jaws and its millions of teeth.
Instead of being threatened by this creature, you feel excited, and you feel yourself getting erect once more.
With your body rigid and at full mast, the creature turns around and lifts it's tail, giving you a clear view of one of the only places that isn't covered in insectoid armor; her plump lips and genitalia, dripping wet in anticipation, bulging outwards with need, and her wide, huge ass, that looks plump, soft, and smooth, and bounces with every step the creature takes.
She quickly lowers herself on you, and you feel yourself enter her soft, warm, humid canals with ease, your tip and your ridges giving her enormous pleasure, making her screech loudly to the darkness beyond you.
She bounces on you feverishly, her ass hitting the ground as she inserts you completely, she keeps this up for several minutes, increasing her movement and her aggressiveness. All you feel is yourself entering and leaving her plump insides, giving you an immense amount of pleasure.
After almost an hour, you hear her screech. She's orgasming. You follow right after, your balls squeezing themselves as you feel gallons of cum moving up your body and leaving your mouth, straight into the womb and eggs of the creature.
She screeches and lays on the ground, catching her breath. Her genitalia is dripping with your green fluids.
She turns around and nuzzles you, showing a strange sign of affection before walking back into the darkness.
You feel more tremors coming, and sed the silhouette of dozens of these creatures approaching you, some of them fighting to see who can reach you first.
You don't even care you've been turned into some kind of giant, skyscraper sized alien cock, or that you've just impregnated a whole nest of alien kaiju queens with creatures designed to take over Earth. You're just a cock, and you drip in anticipation, thinking about the lovely slits and the plump features of your dear queens.