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Somehow, Shepard, Tali, and Garrus are able to share a single bed thanks to the absurd luxury a Cerberus sponsored vessel provided. The SR-1 certainly didn't provide a king size bed in the Captain's Quarters--nevermind the extravagant sitting area, fish tank, and spacer skylight.
Each night, Garrus tears himself away from the slumbering women to do his nightly rounds and calibrations. It's always eerily quiet; on a turian vessel, shifts would incorporate the biphasic sleep schedule natural to the species. On a human vessel, though--the night cycle was dead quiet as almost the entire crew slept their monophasic block of eight hours. The only other species who seemed to follow a non-monophasic sleep schedule were drell, though Garrus wondered if that was an actual cultural practice or a side effect of the one drell he knew being the galaxy's prime assassin.
Thane would sometimes catch Garrus and give a silent nod as he nursed a mug of tea in the silent mess hall. The turian vigilante would offer a congenial nod back; while they never spoke, the simple comradery was actually quite nice compared to the isolation he felt back on the SR-1.
On this particular night, however, Garrus found his mind drifting as he worked on the Thannix Cannons. A few days prior, he had a conversation with his human and quarian girlfriends about a particular fantasy he'd had since the three had begun sleeping together (both literally and fucking figuratively).
"I would never do anything without your permission," Garrus hastily qualified, "but, well, I do feel inspired in the middle of the night sometimes…"
Tali was sipping some triple filtered Palaven-brewed brandy through a ported straw and stretched out on the couch. Her long legs hung over Shepard's lap, allowing the commander to stroke and massage the quarian's legs. An empty whiskey tumlbler sat on the coffee table.
Shepard asked, "Garrus, are you asking to fuck us while we're sleeping?"
Garrus's mandibles flared. "It sounds crass when you put it like that."
"How else should she put it?" Tali laughed. She hiccupped once and took that as a cue to pause drinking. She pulled the straw from the port and seals her helmet. Shepard wordlessly took the glass from her girlfriend and placed it on the coffee table.
Garrus scratched at the edge of his bandaged mandible self-consciously. "I don't know. Turians usually have sex between our two blocks of sleep. It's a charged time of night for us, I guess--but I don't want to interrupt either of your sleep schedules. So when I watch you sleep, a part of me just wonders how good it would feel to make you both cum while you're still dreaming..."
"That's hot," Tali said. Shepard laughed--but the blush rising to her freckled cheeks betrayed a more sincere interest in the fantasy.
Shepard tilted Tali's chin to look at her. The quarian's bright white eyes locked onto the green gaze of her human partner. Shepard asked, "How do you feel about letting our turian boyfriend fuck us right into a wet dream?"
Tali shivered at the husk of Shepard's words; her shiver subsequently amplified when Shepard began to trail her too-many-fingers down across Tali's breasts and around to her ample hips. "I-I think I'd like that."
'Spirits, did they just...!' Garrus's groin plates shifted then and there; he chided himself with an inaudible subvocalization, feeling like a pubescent teen with the ease and potency his cock reacted to his girlfriends' indulgence (and outright enthusiasm) for his somniphiliac fantasy.
"Oh!" Tali suddenly sobered at an idea. She uttered some mischievous chuckles behind her amethyst-faceplate as she brought up her omni-tool. After a few moments, Garrus's own tool pinged. He looked down and found he had been granted administrative rights to Tali's nerve stim program.
"Aw, look, he's speechless," Shepard teased.
"One of my favorite Garruses is a wordless Garrus," Tali said.
"Quite rare," Shepard added. Tali nodded and the two giggled. Normally, Garrus would quip back at them, falling into their tit-for-tat teasing that colored their interactions--but he had to use every ounce of his self-control to keep from emerging fully from his pelvic sheath, because his mind was reeling from the possibilities.
When Garrus returned to the captain's cabin, he found that inspiration once more: Tali and Shepard were sleeping soundly beside one another; the commander's toned, muscular arm was draped over the quarian mechanic's hip. Shepard wore only a pair of red cotton boyshorts. Her pert breasts rose and fell with her rhythmic, restful breathing. Tali had pulled most of the covers onto herself, exposing her girlfriend to the cool cabin air.
In seconds, Garrus shed his nighttime civvies and started stroking his blue cock as it emerged from his slick pelvic sheath. Still stroking his ridged, tapered length, he quickly navigated the desk drawers until he found the antihistamine-laced lube and the two Nerve Stim Pro Pleasure Pads™. He tore the sealed bags and walked over to Shepard. He paused his masturbation to attend to his human girlfriend. He smeared a bit of saliva onto the pads and adhered one at the base of Shepard's neck, and the other on the soft inside of her right thigh. Garrus moved carefully, being sure to move his lover's limbs without disturbing her sleep.
Garrus slid into the bed beside Shepard. When her arm began to fall from its place on Tali's hip, he carefully shifted so Tali remained in the commander's unconscious grasp. The blankets were entirely off Shepard now; they were all tangled up in the quarian's sleeping form. Her helmet was dark with her luminous eyes closed in slumber. Garrus raked his talons gently down Tali's arm and side before following the curve of Shepard's outstretched arm. He gave a rumbling subvocal of pleasure as Tali gave the smallest moan and Shepard subconsciously backed into him--pressing his throbbing cock firmly against the round of the commander's shapely ass.
"Spirits..." He groaned in a bass-filled whisper. He began rolling his hips, sighing as flashes of pleasure set off with each gyration of his sex against Shepard's soft, sexy backside. Before he could get completely lost in sensation, he flicked on his omni-tool. The bright orange light was garish; he squinted to navigate to the Nerve Stim Pro™ app and activate the RECORD Pleasure Pad program. Once the recording began, he selected the STREAM & TRANSLATE protocol. Tali's biometrics were extensively detailed, allowing the translation from human sensory information to quarian physiological parallels to occur in microseconds from the Pleasure Pads to the envirosuit nerve stims.
All of that is to say he aimed to fuck both his girlfriends to orgasm without disturbing either from their sweet slumber.
The dark of the cabin was welcome when he switched off his omni-tool display. Garrus slicked his left forefinger with lube and reached down Shepard's body, past the curled hairs of her mons pubis, and began teasing her vulva. A blush rose to Shepard's peaceful face--while a sharp moan rattled through the audio compressor of Tali's helmet.
Garrus moaned and tenderly inserted his finger into Shepard's pussy. He slowly pumped his thick finger, being sure to pause occasionally to stroke her hot, quivering walls. He knew Shepard liked that--but moreover, he knew Tali went wild for a come hither gesture teasing her sex--and that knowledge was reinforced by the spike in the quarian's heartbeat that registered in his dimmed visor.
"Garrus..." Tali muttered.
The turian froze, finger still deep in the commander's cunt. However, the quarian remained sound asleep. In fact, his visor registered her as deep in a REM cycle. Which meant…
Garrus's mandibles flicked in a smirk. She was having a wet dream. With him in it. Perfect. He slipped a second finger inside Shepard and pumped a little more forcefully, stretching her just right. She squirmed and panted, quivering yet asleep. Her thighs squeezed his arm, but he paid no mind and continued the rhythmic finger-fucking. Soon, he felt Shepard getting wetter, adding a deliciously erotic sound as his fingers plunged inside her. The scent of her arousal hit his nose, sending a nova-level ache to his cock.
"Fuck, I need to be inside you, Shepard," Garrus whispered, voice practically all subvocals. A translator would probably have been unable to pick up his words--but the lustful thrumming of his groans against his carapace offered a more obvious sign of want.
Garrus slipped his fingers out and sucked Shepard's juices diligently, savoring her flavor and scent. His sharp blue eyes took in the sight of his lovers, delighting in the readings he was receiving on his visor; both of them had their body heat rising, heart thumping, and respective pussies drenched in arousal.
Garrus poured more lube onto his cock, groaning as he stroked it a couple more times before lifting Shepard's leg and lining himself up at her entrance. He teased her soaking slit with the tapered head of his cock, playing in her hot folds and letting her own wetness mix with the lube. Finally, he began entering her--one ridge at a time.
"Keelah..." Tali breathed.
"That's it, ah, fuck, yes," Garrus muttered. A few more moments and he hilted himself fully in Shepard's pussy--and subsequently filling Tali with the sensation of his cock deep in her sex, too. His entire body screamed to rut wildly, fucking hard and fast--but he wanted this to last. Garrus refused to come until his girlfriends crested over their own climaxes.
The turian lowered Shepard's leg, allowing her to assume a more comfortable little spoon position as he slowly began thrusting into her. He gripped Shepard's hip with one hand while snaking his other arm under the pillows holding Tali and Shepard's sleeping heads. For some time, Garrus kept a slow and steady rhythm. The silence of the cabin gave way to the filthy sounds of his pelvis smacking Shepard's ass each time his cock disappeared entirely into her wanting cunt. The squelch of lube, arousal, and pre-cum offered an erotic percussive soundtrack that teased a louder growl of pleasure from Garrus.
"F-faster..." Tali moaned.
Garrus's mandible quivered. He immediately picked up the pace and began fucking Shepard in earnest. His grip on her hip reddened her pale flesh, though his talons didn't break the skin.
"Fuck, I'm gonna--" Tali moaned loudly. Her whole body went rigid and Garrus watched, mesmerized, as she came just from the sensation of being fucked by his cock.
Garrus's subvocals trilled lustfully. He felt his knot leave his protective pubic sheath; it slapped loudly against Shepard's wet flesh. He was getting closer, but Shepard had yet to come. The turian vigilante, still sheathed in his human girlfriend, shifted her onto her stomach as he straddled her carefully. He was mindful of his spurs as he wedged his left leg between Tali and Shepard. Once he had leverage once more, he caged Shepard beneath him and began pounding into her.
The pace and fury of his rutting shoved her further into the mattress. Tali even bounced slightly to the rhythm of his fucking. Shepard groaned. The keel of Garrus's carapace barely touched the commander's scarred back, rubbing the flesh between her shoulder blades red. He had medi-gel for that--but medi-gel wouldn't get his human girlfriend to come.
Garrus bent down and nibbled her earlobe, her jaw, her neck...Tali and Shepard moaned in tandem at that move.
"Fuck," Garrus gasped. His knot slipped into Shepard, stretching her to her natural limit. He slowed his speed but deepened his thrusts, mind going blank with the waves of pleasure each time his knot was fully swallowed by Shepard's beautiful, hungry cunt.
He felt Shepard's pelvic muscles quiver and clench. She was close. Simultaneously, his visor alerted him that Tali was cresting towards her second orgasm as she continued to dream.
"Spirits," Garrus gasped. "Come for me, Shepard," he groaned. "C'mon, Tali," he added, pounding into his commander once, twice, thrice--before finally his human girlfriend moaned and came, giving him release. Garrus knotted Shepard and began pouring his seed into her with subsequent, wild thrusts. He bit back a loud moan. Garrus's mandible quivered as he clenched his jaw and snapped his hips against Shepard with each surge of cum. Beside him, Tali practically squeaked as she came a second time.
Spent and dizzy with pleasure, Garrus pulled Shepard back into her previous little spoon position and simultaneously collapsed beside her. His cock had finally finished cumming. It throbbed with the aftershocks of pleasure, the knot filling her and keeping them connected.
Garrus nuzzled the back of Shepard's head and reached over to offer loving, tender strokes down Tali's arm and hips. His long reach blessedly allowed him to grab the blankets while still knotted to Shepard. He blanketed the three of them and soon he fell into his second sleep of the night--deep, restful, and dreamless, for his imagination could do nothing to top reality.
In the morning, Tali woke to vague memories of a very satisfying night. When she grinned at her still-sleeping girlfriend and boyfriend, she noticed a damp spot spreading from between Shepard's legs. Tali pulled the blankets back and sat up. Besides the mess of dried cum that had since spilled from her human girlfriend, Tali noticed the Pleasure Pad™ on the back of Shepard's head.
The quarian laughed and looked at Garrus. "You bosh'tet," she whispered. In the still of the morning, Tali took a moment to release her faceplate and reach down to place a tender kiss on Shepard's forehead and Garrus's brow with her lips. She resituated the faceplate before finally getting out of bed, heading to the bathroom to grab some towels.