So there was this regiment of guardsmen fighting on a planet against the tyranids, but it was a mixed regiment so they weren't really all guars"men"; if you catch my drift.  This one chick was really hot, too, she had these honking big tits that barely fit in her flak armor. The officers and sergeants would always find some way of making her run an errand or do jumping jacks or clean the floors on her knees.
Her ass was pretty good, too.
Also she was blonde.
     
So she was part of this battle against the tyranids and it was going, like, REALLY bad. Like "Horus is back" bad. And that's really bad because he killed the Emperor. Most of the regiment was killed off pretty quick, but mostly the guys because they weren't hot or anything. But this one chick WAS hot so she was fine, like in the movies.
     
Except later she was the last person in her squad and was cradling her dead friend while crying. Her tears were making her mascara run which is a turn off for a lot of guys but some think is pretty hot.  She was breathing hard too, so her breasts were jiggling and stuff.
     
Then she heard a noise behind her and it was really scary. Shit got real, let me tell you.
She turned around and there was a fucking lictor there. Big fucker, too. Not Deathleaper big, but still pretty big.
     
So the chick sees this lictor and fires her lasgun at it, but those are pretty shitty and barely caused it to squint. Just as she was thinking, "Well I'm right fucked, aren't I?" she saw that it had this big cock just swinging away between its legs.
     
Now, she's not a slut or anything, but it was a really big cock with thick veins and little chitinous ridges. She started to pant and felt her pants get wet. Not her underwear, though, because she didn't wear any. She was a commando.
     
Well, seeing that lictor's dick got her real hot and she started to tug at her clothes but it was too slow for the bug so he hopped over and ripped her clothes to shreds. But this isn't a guro fic so she wasn't badly cut up or anything.
    Then the lictor used its Cthulhu face to eat out her pussy; tentacles and shit going all up her snatch and ass like a fucking Zone video.
     
All the while she's just yanking at her tits and telling him to keep going.  Pretty soon she cums and goo is dripping all over the place.  In the excitement even her tits are all like, "Dude, that's hot, I think I'm gonna splooge!" and the other was like, "No way, me too!" Then they both came and milk shot everywhere.
     
The chick started to lick it off and it looked like someone jizzed on her face.  She spread her legs and said something like, "CUM and get it, big boy!" and the lictor was all over that shit.
But the freaky thing was its dick split in two and he fucked her pink and stink at the same time!  Each thrust kept bouncing her up in the air, making her tits jiggle more. They were still spewing milk, too.
     
Then they started to make out and she wrapped her legs around him.
     
They both came at the same time and the force of the lictor's two spewing dicks shot her like, three yards away. She landed on her dead friend (she wasn't that hot, like a 4/10, so it was no big loss).  The chick dug around in some pockets and found a lho stick, which is what 40k calls cigarettes and the Brits call fags.
     
She took two and lit them, tossing one to the lictor.
     
"This is some good shit," he said, taking a drag.
     
"You can say that again."
     
Then everything started to glow and got real trippy.  The lictor burst into pieces and a bunch of space marines in black armour with bones and shit all over them appeared. They had killed the lictor with bolters and stuff.
     
She was like, "Dude, are you the Legion of the Damned?"
     
"You know it, baby," said the sergeant. "Now we're going to bone you."
     
"Cool," she said.

So the chick is standing there stark naked, giving a great view from front or back, surrounded by these Legion of the Damned guys. One of them was nodding to himself as he looked at her sweet ass and two more fist bumped when they got a good look at her tits.
     
"So how are we going to do this?" she asked. "I heard you space marines can't fuck."
     
"Fuck that," said the sergeant. "We got this covered." Then he and the other ones all took bones off their armor and stuck 'em on their groins and she was all like, "Oh, I get it."  In the background the battle was still going on but fuck that I'm talking about a gang bang.
     
She got down on her knees started sucking off the sergeant's boner as he put his big fucking hand on her head, which has a helmet now because Lewd's art was awesome.  Her tits started to drip milk again so the others crowded around and started to grope them and stuff. She used her hands to beat off two more of them, but the others got impatient and lifted up her rump, patting it because it was nice and thick. He shoved his bone dick right into her pussy and started to pound away.
     
"Spit roast," said the sergeant. "Awesome!"
     
They were hitting that shit so hard she felt like the two ones were meeting in the middle, but they weren't because that would be kind of gay.
     
"Shit," she said even though her mouth was full, "I'm gonna come!"
     
"Me too," they all said.  Then the entire squad just jizzed all at once and covered her inside and out with gallons of grade A astartes spunk.
     
"How the hell did you do that?" the chick asked after emptying her lungs of splooge.
     
"Milk bones, duh."
     
"Oh, right."
     
"Well," said the sergeant, high fiving each of his dudes in turn, "we have to go. There's a convent full of battle sisters being over run by orks a billion miles away on another planet and they've got pussies even hotter than yours!"
     
"They taste better, too," she agreed.
     
Then they just fucking disappeared and she realized she was surrounded by genestealers.  They were actually hybrids, though, and all dressed like prostitutes like in that one Ciaphas Cain short story.  It was quite a hot mess of sexy bitches, too.  They had gnarly tattoos like biker chicks get and tits of all shapes and size and their clothes totally made their asses look big, but in a good way.  Also, they really were big asses.
     
"Oh shit!" said the guardswoman.
     
"No, it's cool," they all said at once because of the Hivemind works like that.  All of them just walked up to her and opened their mouths.  If that sounds scary, it wasn't, because they all had really long tongues just made for giving great blowjobs or digging deep into pussy and they all started to lick all over her body.  It was pretty hot, cause they were all lezzing out and touching themselves and each other at the same time.
     
"We're just here for the biomass," they said when she was clean. "But we'll take some of dat ass as well."
     
The chick shrugged and spread her legs and arms out. "Go right ahead, I've got nothing better to do."  She probably did have better things to do, but she just really liked getting eaten out.
     
So they all started to go at her from every direction. One of them ate out her pussy, tickling her cervix with her long tongue, while another dug so far into her ass it was like getting an enema. But she liked anal so it was cool.
Two more of them latched on to her breasts and started sucking.
     
Her tits were high fiving each other in their minds. "It's like getting a blowjob," said one, pouring his hot, white goo into the genestealer's mouth.  "Shouldn't be we chicks, though?" said the other, doing the same thing. "We are boobs." The first one shrugged and was like, "Dude, who cares, this is hot as fuck."
     
"Hey, you still have your tonsils," said the genestealer cultists after one of them started making out with the chick.
     
Up in orbit the entire fleet just started to burst out with spores and jizzed those tyranids all over the planet, like the whole Hivemind was cumming at once.  It was pretty ballin'.
     
Once they were done they started to leave and where all like, "Thanks for the meal, lady!" And waved and said she had a great time.  She didn't even mind when they took her dead friend's body for travel snack since she was only a 4 out of 10 anyway.
     
When they were gone she heard something in the bushes that sounded like someone fapping furiously.  She walked over to it and heard someone whisper, "That was so fucking hot, did you get it on tape."  Another voice said, "Yeah, but it's going to be shaky because I was fapping furiously while watching."
     
So she was all like, "Dude, what the fuck?" And then two dark eldar popped out and they were wearing really freaky bondage shit because they're into that.
     
"Sorry," they said, but they were still fapping away at their throbbing eldar dicks.
     
"You could have joined in," she told them, already fingering herself because she was kind of starting to see that this was going to be on of those fics where she fucked fucking every fucking fuck she fucking came across. Fuck.
     
Then the two dark eldar looked at each other, which was kind of gay since they were both still jacking off, but then they reached out and grabbed her arms. Together they pulled her through one of those webway portals that the Craftworld Eldar really should get too, but their codex is better now anyway, so fuck it.