No initial problems, until much later

Within a week, the first waves of colonists soon settle down on the planet of Gen'heyem, guarded by fresh troops and ships from Alliance territory and its closer allies, the Turians and the Krogans.

Though the colony's capital, Shamar, is far from being a proper city, it is starting to grow in size as a sizeable fortified town, replete with sturdy walls and gun emplacements, wide roads and deep sewers. Not far from the town, land is being increasingly cleared for agriculture on the surface whilst underground hydroponic farms are set up to feed the population.

With dedicated patrols and a police **** keeping order, there is virtually nothing wrong that needs rectification by the government. Months pass, and the town of Shamar grows into a city with a population of 100,000, and at least a quarter of a continent is now under Alliance control.

Until a strange phenomenon starts to take place within the town.

It was your day of R&R, and you eagerly spent it drinking at one of the newly-established bars in the town with Wrex and Garrus. Cheerful banter and laughter was exchanged over pints of beer and the occassional cocktail, and now your face burned red with intoxication.

"So you know, I used to be dating this boy in college," You said, "He seemed so arrogant and sure of himself in his academics that he proudly boasted he would be able to ace the exams! And you know what he did? He didn't study a damn lick, and got the lowest score out of the entire class! He literally became a laughing stock!"

"Ha! Guess that just shows being smart doesn't mean being lazy!" Wrex exclaimed, "I certainly didn't get to smash Collectors and Reaper shit by sitting on my ass!"

"And I certainly didn't slack off in training my sniping skills," Said Garrus, "Recall one bad guy we tried to **** for information, and we ended up just tossing him out the window to make it look like an accident."

More laughs followed, and as if an epiphany struck you, you told the bartender, "Three bottles of Krogan liquor, please."

"You sure you want to drink that much, ma'am?" Asked the bartender, "That's very strong stuff, just telling you."

"It's fine," You said, slurring slightly, "We don't have work the next day, and we want to try something good..."

"Um... if you say so ma'am," Said the bartender, "Just be careful, alright?"

After giving him reassurances, the bartender brings your order to your table, and all three of you took a bottle each and toasted to each other.

"To the Alliance!" You cheered.

"To beating the shit out of bad guys!" Wrex cheered.

"And to friends and family!" Said Garrus.

In perhaps the most dangerously daring moment, all three of you downed your bottles of blue-coloured Krogan liquor like water, ignoring the burning in your throat and stomach. Guffawing as you gasped for air after your binge-drinking, you fell face-flat onto the table, Garrus doing the same. Wrex remained tipsy, hiccuping uncontrollably.

Having paid the tab on your behalf - using your credits of course, Wrex hauled the both of you back to your personal room, somehow managing to find his way back despite wobbling in every step and having blurry vision.

Plopping down onto your bed, being thoroughly ****, none of you could muster the energy to even move a finger. That is, until a strange stirring was felt in your loins.

"Oh, God..."

A gentle heat spread from your loins to the rest of your body, making you sweat despite the air-conditioning of the room, and your fingers instinctively moved to stimulate your vagina.

"S-So hot..."

Feeling the heat to be unbearable, you stripped out of your clothes and tossed them to the side and relished the feeling of cold air on your bare skin. Your nipples stood erect, and you caved into your urges to pinch them and fondle your breasts, and you are rewarded with euphoric pleasure.

"Oh yes, my breasts feel so soft..." You muttered deliriously, "That's why I love these natural D Cup breasts!"

To your sides, Garrus and Wrex did similar things, only that their cocks now stood erect and throbbing with angry red tips, and they looked at you with eyes of delirious want.

"S-Shepard, my thing can't go down no matter what," Wrex said, "Think this is one of those times?"

"What else can it be, Wrex?" Said Garrus, stroking his erect phallus, "And who else do we do it with?"

Smiling at them, you pulled them in for long, sensual kisses, your tongues intertwining and mixing before you pulled away, strings of saliva on your mouths.

"Goddamnit, I need it now," You moaned, "I need your cocks..."

Wrex takes you onto his lap, promptly impaling your virgin pussy on his massive thing and sending you screaming loudly from the sheer pain of penetration.

"Oh fuck!" You cried.

The feeling of your torn hymen sent stars blinking in your vision, and only Wrex's iron grip on your backside kept you sitting upright. The Krogan, meanwhile, was sucking on your teats as if they were lactating, relishing in their taste as his tongue licked your stiff peaks.

"Damn, you're so fucking tight," Wrex muttered, "No wonder some of my Krogan buddies love fucking Humans."

A squirting sound registered in your ears, followed by a hard sensation on your derrière.

"Here it goes..." You heard Garrus say.

And then you feel your asshole stretched by his girth, eliciting a pained moan from your lips.

"Oh fuck... to think I'd get double-penetrated by my two good friends," You muttered, giggling softly, "You naughty boys."

You slowly settle into a rhythm as both Wrex and Garrus pound into your holes, and your pain fades to be replaced with intense pleasure, amplified by whatever is the source of arousing heat in your bodies. The stretching of your holes is increasingly bearable, and lacking restraint, your wanton moans plague the entire room like eternal echoes.

Wrex suckles your breasts like a hungry babe, whilst Garrus exchanges sloppy kisses with your lips in the midst of thrusting into your asshole.

"Yes, yes, yes! Fuck me senseless!" You cried, "Fuck me like a whore!"

As the pounding continued, you felt their dicks begin to twitch, their breaths increasingly laboured.

"I-I think I'm going to cum...!" Said Garrus.

"Me too...!"

What followed was nothing short of pure bliss.

The moment you reached your climax, both your pussy and asshole clenched on the invading cocks, forcing them to spill semen in a delicious creampie and painting your insides white. The sensation of being inseminated - possibly impregnated - made you break out into a white-eyed, delirious smile.

"Your things... are messing me up..."

And with that, the three of you collapsed onto the bed, passing out in orgasmic bliss.