It's not complete yet, but here's part 1.

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Duke descended deeper into the alien lair that resided in the bowels of the city. With each passing minute, more and more slimers, octabrains and pregnators were creating a road of dead bodies along his way.

"How deep does this shit hole go?" he yelled in despair, blasting through waves of enemies with his trusty shotgun.

After about half an hour through his journey, he began hearing feminine voices. He could hear the desperate cries of babes echoing through the halls of the damp and dark alien lair. He kept pushing on, until after one turn he reached a big open chamber. There were at least two dozen alien eggs in the middle. He then looked around the eggs, and realized - much to his dismay - that there were kidnapped babes all around the eggs. There were 3 hanging from the ceiling, their feet trapped. They were looking at Duke, pleading to be saved. 4 of them were entrapped in vines along the walls of the chamber. They were all naked and voluptuous and Duke would have loved for the circumstances to be different. He didn't really have time to oogle at the hangin' tits of the ceiling trapped babes or gaze upon the sweet flesh of the others - suddenly 2 pregnators sprang from the dark corners unto two babes, clamping their marvelous and soft tits with their pointy mouths(?) and wasting no time to penetrate deep into their succulent cunts with their penises. Duke wasted no time and sprang into action, bashing the pregnators off the two distressed girls. In the process, their breasts were violently torn away, leaving their chests mutilated. Duke then stomped the pregnators and began destroying the eggs in the middle, before more of them hatched. His ripper machine gun made short work of them.

"NOT MY BABES. NOT IN MY TOWN." he shouted with rage, but it was too late - most of the babes were probably already fucked, literally.

He went over to the first attacked babe - a tall brunette with curly hair and good physique. She was probably not even 21. She was heaving and convulsing, clearly in shock from being raped by the pregnator.

"Damn waste of good tits..." Duke said looking over her flayed mammaries.

Upon inspecting her sex, he saw a white substance dripping from her ravaged cunt. In about half an hour she would die violently as the octababies would tear her womb apart and eat her from the inside, then bursting out and devouring the rest of the women in order to grow.
He put his golden eagle beneath her chin.
"Sorry babe, it's better this way." he said as he pressed the trigger, splattering the babe's head across the walls.

"What a mess. Now, to finish the job."

He took her lower abdomen into his sight, took one last look at the dripping wet cunt of the dead babe, then fired the rest of the magazine into it, annihilating the alien seeds and making a gory mess of her uterus.

He went over to the second violated babe - a feisty blonde with fair skin. Only her left milk bag got torn off from the attack, her other one being in pristine shape. Her perfect pink nipple prompted Duke to give it a really hard squeeze. He almost tore off her remaining breast himself, not realizing his strength in comparison to the softness and delicacy of her flesh. He then brushed off her long hair from her face to look at her more closely. She had a cute, innocent looking face, with sky blue eyes...and she begged him. Begged him to save her. He wanted to help, he wanted for there to be a way, but he knew that once she was fucked by a pregnator, there was no coming back. He looked down at her pussy. Her lips were spread apart, alien semen was dripping down her legs...

He had to spare ammo and be efficient, so he got out his shotgun. He crouched down, and pressed the barrel up in her vagina, slowly inserting it. He pushed it in only a few centimeters, so as to damage as much of her sex as possible and end her life by causing massive internal injury. It wouldn't be a quick death, but certainly better than being slowly devoured. He rubbed his hand over her womb, caressing her, before he said his goodbyes.
"See you in heaven babe!" as he pulled the trigger, liquefying her insides and turning her womanhood into minced meat. She gave out a blood curdling scream, then coughed blood a few times and tilted her head backward, her beautiful eyes rolling over. Blood and gore poured out of what once was a tender teen pussy.

"Damn it..." He exhaled with anguish as he looked around at the rest of the 5 women, who were probably also doomed. As he was going to see the third babe who had her feet and arms stuck in the wall, one of the babes from the ceiling started convulsing and screaming in pain. Duke immediately saw her tummy being deformed as if something was inside. He didn't really have time to react as her belly burst open and 3 octobabies sprung out. Duke whipped out his Ripper and mowed them down as fast as he could, but in the process he also hailed the fourth wallbabe with a shower of lead. She was probably of african descent as her skin was dark brown. Now, however, it was colored with something even darker...her blood. She was hit all over, from her big milk filled udders, to her belly, thighs and womb. Crimson holes dotted all across her feminine form. She expired before Duke could get to inspect her to know if she had been compromised. The ceiling babe that had just burst was somehow still alive and in grave pain - her moans of distress catching Duke's attention.
"Kill me...*cough*...please.... *cough*" she pleaded. Duke responded by grabbing her hanging head with his arms and snapping it in a sudden, powerful move.

The remaining wall babe was a hot, freckled redhead. Butt naked, with her precious twin jewels the size of coconuts. Her protruding hipbones and toned belly made Duke instantly have a hard on. He was hoping, now more than ever, that she wasn't yet compromised, but he was weary. He approached her and pointed his shotgun directly at her womb, almost pressing the trigger.

"Don't shoot! I haven't been fucked yet! They only entrapped me in the wall and left me to be food for the hatchlings! PLEASE DON'T SHOOT!"

Duke raised his eyebrow in anticipation. He inspected her tits closer...no bite marks. He probed her pussy with his middle finger as deep as he could...no alien sperm.
"Jackpot. Let's get you out of there."
He pulled out her limbs one by one out of the living walls, almost snapping her slender arms due to the necessary force, but she was grateful nonetheless. She was pretty small, barely 1.6 meters tall and with a tiny frame, yet her fiery long hair and her green eyes made her incredibly seductive.

"Hold on, before we go on. I need a fix." Duke said as he unzipped his trousers and let out his glorious man rod.

She gave him a dirty look then kneeled and began to work his member with her feeble and delicate arms, licking it as she progressed with circular motions. She clearly could use her tongue.

"Ooh yeah, that's the spot" exclaimed Duke as he was looking into her green eyes.

He couldn't really get to the orgasm, as the babe's beautiful face and head suddenly exploded in a shower of blood and brain. It was an octabrain that shot an energy ball. Somehow Duke's dick escaped barely grazed. He quickly grabbed the shotgun and sent the flying alien monster to hell, exploding in the ceiling and killing the other two babes trapped on the ceiling in the blast. Only their charred carcasses were now visible. Their skin was burnt and their fat tits were splattered all over. But somehow, Duke had to finish his job, so he grabbed the redheads corpse by the shoulders and thrust his member down her neck stump, fucking her esophagus.

"Now that's what I call deepthroat!"

He quickly came, spurting his seed deeo into her belly. Afterward he tossed her corpse away, cleaned his cock and stomped viciously on her cunt a few times, just to be sure there won't be any octababies coming out. His force was enough to make her neck stump and pussy to spurt jets of blood.

He proceeded through the halls until he reached a terrifying corridor. Upon opening an anus-shaped door, he saw a 15 meter long, 3 meter wide corridor filled with babes plastered all around the walls. There were probably a dozen or more of them. Some of them were stuck in such a way that only their lower half was encased in the wall and their upper body was free to flail, while others were encased in an opposite way, only their feet and pussy being exposed. They seemed to be blinded by something and were grasping at the air in front of them, wailing and crying. As Duke approached and tried to pass through the corridor, he was quickly grabbed by their hands.

"Let me go, god damn it. How am I going to save you if you keep pulling at me."

But common sense didn't seem to reach them, so he had to break himself out by force, snapping their arms like twigs and kicking them back. There was no way around it...he had to kill all of them.

Just as he was preparing a pipebomb, he heard noises from the other side of the corridor. A pack of octabrains were coming his way, from the other side. He caught a quick glimpse of them before he ducked away behind a corner - they weren't full size yet, probably not mature.