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Cerberus was an organization that Commander John Shepard had a lot of mixed feelings for. On one hand, they were xenophobic terrorists who'd committed a number of terrible atrocities for the sake of securing the human race's dominance in the galaxy, even against the very humans they claim to be fighting to uplift. On the other hand, they had brought Shepard back from the grave and they were the only ones who seemed to be taking the threat posed by the Collectors seriously. Not to mention, they'd given him a very generous gift in the form of agent Miranda Lawson. She was genetically engineered the peak of physical perfection and nobody knew it better than her, given how much she flaunted her outrageously curvy body at every turn, which naturally took its toll on Shepard, who'd gone a full two years without the touch of a woman, and Miranda, as the lead scientist behind his revival, had developed quite the crush on her, so the rest soon became history.
On a relatively quiet night aboard the Normandy, within the captain's quarters, Shepard and Miranda were in a very familiar situation, where Miranda was on top of Shepard feverishly making out with him while Shepard was greedily groping and sometimes spanking Miranda's huge round bubble butt, easily his favorite part of her body. As much fun as Miranda was having making out with Shepard, she ended it long enough to say, "I have a surprise for you, Commander. I'll be right back", getting off the bed and sauntering towards the door, but before she was out of range, Shepard said, "Don't keep me waiting long, Miranda", sending her off with an especially rough smack on her fat ass, making her giggle lightly.
She returned barely a minute later, but with company in the form of yeoman Kelly Chambers. Before Shepard could say anything, Miranda said, "I know you've been wanting to have a threesome for a while, so I decided that Kelly would be great for us", followed by Kelly saying, "What do you say, Commander?". Shepard quickly looked the two operatives, noting the night and day differences between their bodies, with Miranda's voluptuous frame clashing nicely with the smaller and cuter Kelly. He quickly made up his mind and said, "Sounds good to me", and with that, the three of them all began a three-way make-out session, letting their hands explore each other's bodies.
Once the kiss ended, Kelly and Miranda sank to their knees, where they freed Shepard's massive hard cock. "Dear God, he's huge", Kelly whimpered, "No wonder you can't stop talking about him", to which Miranda replied, "Well then, why don't you take a closer look?", grabbing Kelly's short red mane of hair and forcing her down onto Shepard's shaft. This was easily the biggest cock human cock that Kelly had ever encountered, and she'd encountered more than a handful throughout her life, but she refused to back down and sucked and slurped on the massive shaft to the best of her abilities. Miranda later joined Kelly in a double blowjob, the both of them slobbering on as much of Shepard's cock as they could, before Miranda decided to let Kelly have it all to herself, getting behind the tiny girl and pulling down her pants, revealing her cute little ass. It was nowhere near as massive as Miranda's own rump, but it was still round and tight, and plenty enticing on its own merits, prompting Miranda to bury her face between the redhead's perky cheeks and begin licking and lapping at her tiny holes, all while Miranda furiously rubbed her own pussy through her suit.
In a chain reaction, Miranda's pussy squirted all over her fingers, Kelly's pussy squirted in Miranda's face, and Shepard fired his load into Kelly's mouth, the cute yeoman holding the spunk in her mouth long enough for Miranda to kiss her again, the two Cerberus operatives sharing every drop they could. Once they finished, Miranda asked, "Having fun, Kelly?", to which Kelly replied, "Hell yeah. Thanks for inviting me", followed by Shepard saying, "Well don't worry, Ms. Chambers, we're just getting started", and with that, he and Miranda picked up Kelly and laid her on her back on the bed. Kneeling between Kelly's legs, Shepard aligned his still hard cock with her tiny pussy and asked, "Ready?", to which she answered, "Fuck yeah I am, Commander. Fuck me, fuck me as hard as you can!". Needing no more invitation, he rammed himself into Kelly's pussy, both of them moaning from the feeling.
"Ah, ah, ah, ah!", Kelly moaned and screamed as Shepard hammered into her pussy. As per her request, Shepard was merciless, slamming almost violently into the tiny girl's pussy, easily among the tightest he'd ever had the pleasure of being buried in. Kelly however refused to give up and wailed, "Don't stop, Commander, don't stop for anything!", which emboldened Shepard to pound her harder than ever before. Miranda was at first content to watch her boyfriend fuck the adorable girl's brains out, but eventually decided that she wanted in on the action, stripping fully naked and silencing Kelly's moans by sitting on her face, smothering her with her giant booty and saying, "I worshipped your ass, Kelly, so why don't you return the favor?". Needing no more encouragement, Kelly got to work licking and lapping at Miranda's holes, giving her pussy a good amount of attention but mainly focusing on her asshole. "Isn't she wonderful, Shepard?", Miranda moaned, to which Shepard replied, "Fuck yeah she is! We should've invited her a long time ago". "Agreed", Miranda said, "so let's make up for some lost time", leaning in to make out with the Commander. Kelly would've said something as well, but her mouth was a little busy at the moment.
It wasn't long before Kelly found herself gushing around Shepard's cock, Miranda squirted in Kelly's face, and Shepard fired off his load into Kelly's pussy. As Shepard pulled out, Miranda got on all fours between Kelly's legs and wasted no time getting to work eating her pussy, slurping Shepard's spunk out of her slit, making Kelly moan and hold onto Miranda's jet black hair for dear life. On his end, Shepard got behind Miranda and rammed himself into her pussy, pounding into her just as mercilessly as he'd done to Kelly. As he did so, he got to watch Miranda's huge bubble butt bounce, clap, and jiggle in response to his thrusts, prompting him to begin spanking the enormous cheeks in tandem with his movements. As said before, most people considered Miranda's fat ass to be the best part of her body, and Shepard was no exception, taking every chance he could to squeeze and smack it. Miranda did nothing to dissuade Shepard from the attention he showed her huge butt, in fact she encouraged it, often walking past or in front of him with a wiggle to her wide hips, constantly "accidentally" dropping things so she'd have reasons to bend over in front of him, or again "accidentally" grinding her juicy ass against his crotch.
In another chain reaction, Kelly's pussy, now cleansed of Shepard's load, squirted in Miranda's face once more, Miranda's pussy gushed around Shepard's cock, and Shepard blasted his load into the biotic Cerberus agent's pussy. When Shepard pulled free, Miranda crawled on top of Kelly and began to make out with her once again, grinding their wet pussies against one another. Shepard quickly aligned himself with Miranda's asshole and, without warning, rammed himself inside, pounding away at her rectum with all his might and resuming his pattern of smacking her huge meaty buttocks. Every so often, he'd pull out and force himself into Kelly's backdoor, going back and forth between the assholes of both Cerberus operatives at intervals that would ensure that they'd both get equal attention.
On his last legs, Shepard fractioned his last load into quarters, blasting the first quarter into Miranda's bowels, another quarter into Kelly's rectum, before ordering them to their knees and firing his last two quarters into their open mouths, instigating another cum-swapping make-out between the two girls.
Cuddling on the bed, Kelly breathlessly said, "Jesus fucking Christ, guys. It's been so long since somebody fucked me like that", to which Miranda replied, "Happy to help, Kelly", followed by Shepard saying, "You're welcome to share a bed with Miranda and I anytime". Smiling, Kelly snuggled up between Shepard and Miranda as all three of them fell asleep in each other's arms.
Shepard would never outright sing Cerberus' praises, but he couldn't deny that allying with them came with some great benefits.