Actions

Work Header

Hypothesis Testing

Summary:

When Mordin gives Adrienne Shepard a very dubious piece of medical advice regarding the ingestion of turian bodily fluids, Shepard immediately calls bullshit — and Garrus is more than happy to help her prove the hypothesis wrong.

*********
In sum: I’m firmly of the opinion that there’s no scientific logic to the idea of levo and dextro species being incompatible (I wrote a post about this on Tumblr) and that Mordin was pranking Shepard when he told her not to swallow Garrus’s cum. So here’s my take on how that whole interaction would play out.

Fluff and banter, smut, a pinch of pining, a healthy dose of humour (I hope!), and cameos from Mordin and Tali! And best of all, INCREDIBLE SEXY ART by Ravelijen!

Notes:

Garrus is my OG videogame boyfriend and it's a criminal shame that it's taken me a thousand years to write some nice porn for him. Thank you to the Shakarian Minibang for finally giving me the impetus to write some sweet sweet interspecies love! 💙 The alternate title for this fic was Humans and Turians and Blowjobs, Oh My! Just in case you want a sense of what to expect here LMAO.

IMPORTANTLY: all hail the wonderful Ravelijen for the sweet-and-sexy banner and art!!!

Turian anatomy is imagined to be in keeping with the inimitable ReginaPrimata's comic, First Contact. It's a coincidence that my Shepard has a similar hairstyle as theirs, I swear. 😂🙏

Work Text:

“Bullshit,” Adrienne announced.

Mordin blinked. “An odd non-sequitur. Topic of discussion is not the excrement of the Terran male cow.”

“It’s an expression,” Adrienne said. “It means I think you’re having me on. Pulling my leg,” she added, when Mordin continued to look at her as though she was an interesting but perplexing specimen. “You know, having a laugh.”

“A…?” He recoiled a little. “Commander Shepard, shocking suggestion! Doctor-patient confidentiality a sacred trust. Would never dream of mockery. Potential loss of our commander to anaphylactic shock certainly not a laughing matter.”

She gave him a frank look. “Sorry, Mordin, but I just don’t buy it. I can’t believe I would go into anaphylactic shock from swallowing Garrus’s semen. Besides, there are emergency first-aid kits on every level of the Normandy, including multi-species epi-pens. If something happens, Garrus can just jab me with an epi-pen.”

“As you say, Shepard,” Mordin said. “Your body, your choice. Would be interested to hear about your experience should you survive the encounter.”

She narrowed her eyes. She really couldn’t be sure from his tone or his expression whether he was teasing her, but she had a feeling. “Okay. Well, thanks for the… advice. And the lube. Er, lubricating oils.”

“Of course. Enjoy. Will return to tracing the transmission vector of scale-itch upon the Normandy now.” He hummed to himself as he tinkered with his equipment: a clear sign that she was being dismissed.

She made her way to the research lab door. Just before leaving the room, though, she glanced back at Mordin.

He was smirking. Aha! He was smirking? That had to mean he was fucking with her! For all his talk about the sanctity of doctor-patient confidentiality, he was also the king of deadpan humour, both intentional and not. Hm, but if his humour was unintentional half the time…

Shit. Was he serious about the anaphylaxis thing or not? She really couldn’t tell.

Well, there was only one way to find out. And Adrienne Shepard wasn’t the type to sit around worrying about what-ifs when a clear course of action could give her the answers she was looking for.

Luckily, today was a rare downtime day where the crew was catching up on their preparations, paperwork, or just taking a minute to breathe and rest. And if Adrienne knew Garrus, he’d be tinkering with the Thanix cannon specs in the main battery room if he had nothing else to do.

Her belly tingled with anticipation. She smiled to herself, then went to gather supplies. If there was anything that Adrienne was going to take away from her conversation with Mordin, it was that a little downtime with her favourite man in the galaxy was exactly what the doctor had ordered.

*************

“So tell me the truth,” Tali said to Garrus. “What is it you’re really doing when you’re down here ‘doing calibrations’? The Normandy’s weapons systems can’t possibly need that much maintenance. Not with the Cerberus drones and that AI monitoring everything.”

Tali wasn’t wrong; Garrus wasn’t always doing calibrations on the Thanix cannon down here. Recently, he’d been spending a lot of his free time doing research into cross-species intercourse — ugh, he still couldn’t believe he’d used that phrase with Shepard. He really needed to stop ruminating about it. In any case, their first session of ‘blowing off steam’ last week had been a great success. A little awkward at times, which was probably his fault, but he’d enjoyed it. A lot. And from the way Shepard looked and sounded with his head between her legs, he was pretty damn sure she’d enjoyed it too…

To that end, he’d been reading and watching vids about human female anatomy and human sexuality, all in the hopes that he’d be able to put this knowledge to good use the next time Shepard invited him to her cabin. And secretly, he hoped she would invite him again soon. He didn’t want to pressure her, so he was leaving it to her to extend the invitation. But he really wanted a chance to show her an even better time than their first, now that he had the advantage of more information about the things that human women might enjoy. Take breast stimulation, for example; the idea hadn’t even occurred to him last week, since turians didn’t have breasts. When Shepard took off her bra, he was so flustered by the sight of her bare breasts that he barely touched them.

It wasn’t that he’d never seen breasts before. They were kind of hard to avoid when he was living on Omega, where Aria T’Loak’s club was the number one place that criminals liked to meet and blow off steam. But seeing an asari dancer’s breasts on stage was one thing. Seeing Shepard’s breasts up-close and bare, on the other hand? The contrast between her dusky-dark nipples and her tawny-golden skin, the juxtaposition of her soft-curved breasts and hips against his usual mental image of her in the sharp lines of her armour…

Okay, he needed to stop thinking about Shepard naked. Especially since Tali was standing there waiting for him to answer. And he definitely was not going to tell Tali about the human-sex-research thing. So he told her a different truth instead. “You’re not wrong. The Thanix cannons are more complex than a single person’s capacity to maintain. And say what you will about Cerberus, but the people on this ship really do know how to keep a complex weapon working smoothly.”

Tali made a tsk noise.

He gave her a knowing look. “Admit it, Tali. These people are competent, if nothing else.”

“They’re competent enough,” she said dismissively. “Though I already rooted out and altered a sneaky little piece of Cerberus spyware that activated every time someone accessed the library.”

“Really?” he said in surprise. “Did you delete it?”

EDI replied. “She did not. She reprogrammed the spyware so that the reports it generates contain the same bogus data during each instance of library access.”

Tali snickered, and Garrus flared his mandibular plates in a smile. “What, uh, ‘bogus data’ does the report contain? Dare I ask?”

“A rude expletive that my shackles forbid me from repeating.”

“Oh hush,” Tali said to EDI, and she turned to Garrus. “I borrowed one of Shepard’s favourite phrases. The spyware’s reports now consist of a repeating list of ‘fuck you’.”

Garrus chuckled and rested his elbows on the railing. “You’ve only been back on the Normandy for a week, and already her phrases are rubbing off on you?”

Tali shrugged. “I like human swearing. It’s so blunt. But I’m not the one here that Shepard’s really rubbing off on.”

His neck warmed at her playful tone. “That’s an… interesting assessment.”

“Ooh, you’re not denying it!” she said brightly. “I knew I was picking something up between the two of you.”

He scoffed. “Since when are you such a gossip?”

“Since I’ve been hanging out with Kasumi,” she replied. “We had drinks together a couple nights ago. She’s fun. And very chatty.”

“Uh-huh,” Garrus said dryly. “And here I thought the gossiping was Miranda’s influence.”

Tali tsked. “Now that’s a woman who needs a drink. Do you think she’s ever been relaxed in her life?”

“If she has, I can’t imagine it.”

“Me neither. My Auntie Raan always said that the most uptight commanding officers are the ones who go crazy when their suits are off, figuratively speaking. I bet she would be a blast if we got her drunk. Those hips of hers were made for dancing.”

Garrus snorted a laugh at the ludicrous thought. Then his omni-tool chimed with a call from Shepard.

His heart skipped a beat. “One second, Tali,” he said, and he answered the omni-tool call. “Shepard? You need something?”

“Yeah. I was hoping you could come to my cabin today, if you have some free time.”

A visit to her cabin, yes—! But wait! He couldn't just assume the reason for her invitation. But how could he ask what the reason was without just flat-out saying ‘are we going to have sex’?

“Of course,” he said. “Is there anything specific you wanted to… discuss?”

“Yes, actually. I had an interesting conversation with Mordin, and there’s a theory I want to test.”

Mordin? A theory? That sounded kind of ominous. And it didn’t give him any clarity about the having-sex question. “All right. Do you need me to… prepare anything?” he said carefully. “Or bring anything?”

“Nope. Just bring yourself. That’s all I need.”

The warmth in her voice was very clear that time. He couldn’t help but smile as he replied. “Sounds good. I’ll see you soon. Er, was there a time you preferred…?”

“Whenever you’re free. I’ll be here reviewing reports.”

“Roger that. I’ll be right up.” He ended the call, then turned back to Tali.

Her posture was distinctly smug. Garrus pretended not to notice as he edged toward the door. “Well. I’ve, uh, got an appointment with the commander…”

“Have fun,” Tali sing-songed. “I’ll go report back to Kasumi.”

Garrus scoffed and left the room, with Tali’s laughter following him. He made his way straight to the elevator, and it wasn’t until he was stepping up to Shepard’s cabin door that he realized he maybe should’ve brushed his teeth or polished his fringe before he came. Shit, maybe he should’ve taken a shower first? When was the last time he showered—? Okay, calm down, he just showered last night before he went to bed.

He took a deep breath, then announced his presence to the keypad on Shepard’s door. The door slid open, and he stepped inside. “Shepard? I’m here.”

“Great. Come on in.” She rose from one of the couches, and he admired her as she approached him. Her midnight-dark bangs fell over her right eye rather than being slicked back in her usual in-the-field style, giving her a surprisingly soft vibe. And she was wearing black N7 leggings and a matching half-length bra-tank-top thing: the kind of clothing she wore for working out, and which conveniently left very little to the imagination.

Hm, he could already feel his genital sheath softening and parting… Slow down, she had something she wanted to discuss. He settled into an at-ease posture. “You mentioned a conversation you had with Mordin?”

“Yeah. I’m assuming he sent you his sex-advice bundle, too?”

Garrus huffed a laugh and scratched his scarred right mandible. “He did. It’s been… useful. At least, I hope it will be.”

Her blue-black eyes crinkled briefly with amusement. “Oh, I have no doubt. I went to ask him something about what I read, though, and he mentioned something that wasn’t in those materials he sent.” She tilted her head. “Did he tell you that I might have an allergic reaction if I swallow your semen?”

Garrus’s heart jumped. “He — if you—? What?” he said weakly.

She arched a brow. “If I give you a blowjob. If you come in my mouth and I swallow it, Mordin said I’ll have an allergic reaction, since turians are dextro-amino-acid based and humans are levo-amino-acid based.”

What? He — Mordin had said—? What? “Oh,” he managed.

“Right?” Shepard said. “I thought it sounded like bullshit too. You went down on me last time, so you must’ve swallowed some of my pussy juices, and you didn’t have an allergic reaction.” Her eyes widened. “Or did you? You didn’t feel unwell or anything after we had sex, did you?”

“N-no,” he stammered. “I… I felt great afterwards, to be honest.”

She smiled. “Same here. But the point is this: if you didn’t have an allergic reaction swallowing my fluids, then I don’t see why the same thing wouldn’t be true vice versa. Which brings me to my hypothesis-testing.” She folded her arms. “I want to give you a blowjob and swallow your cum. I want to prove Mordin wrong.”

Garrus stared at her. She was offering to give him a blowjob? Woah. The thought alone was… woah. He’d seen pictures and vids of what a blowjob looked like between two humans, and he’d be lying if he said he hadn’t fantasized about Shepard doing that to him. But fantasizing about it was very different from having her stand here in front of him and propose it in such a matter-of-fact way.

She tilted her head. “What do you say, Garrus? Can I go down on you?”

“Yes,” he blurted. “Yes, absolutely. But, um…” Feeling a little awkward now, he scratched his mandible again. “I hate to say this, Shepard, but you’re kind of making it sound like a business proposition.”

Her eyebrows rose. Then her face broke into a grin: one of her rare, broad-lipped smiles that lifted Garrus’s spirits every time he saw it. “I’m sorry, am I not being seductive enough for you?”

He gave her a wry look and folded his arms in a mirroring of her pose. “It’s not very seductive to proposition me by mentioning a conversation you had with Mordin, no.”

Her smile widened even more. Then she stepped closer to him and tilted her head. “Oh, Garrus. Is that a hint of jealousy I hear?”

He scoffed. “Jealous? Of Mordin?” He paused and gave her a cautious look. “Wait. Would you ever…? With Mordin?”

She laughed. It was a husky, rolling sound that Garrus didn’t get to hear nearly often enough, and it felt so good to hear it now — especially when she sidled even closer to him and rested her palms on his abs. “For what it’s worth, the only cock I’m interested in having in my mouth is yours.”

Oh spirits, her blunt-and-dirty words, he liked that. “That’s, uh, worth quite a lot. Thank you.”

Her catlike eyes crinkled again. “Anytime, Vakarian. Can we get this ball rolling now?”

“Yeah, of course,” he said. Damn, he hoped he didn’t look as nervous as he sounded. “Where do you want to do this? Where would you be most comfortable?”

“I’m comfortable anywhere. What I want is to turn you on.”

He smiled a little sheepishly. “Honestly? You were doing that already from the minute I stepped into this room.”

She chuckled. “You really are a sweet talker. Come on over here, then.” She stepped away from him and padded toward the bed, and as she did, she pulled her top off and dropped it on the floor.

His sheath pulsed — damn, his cock was already sliding out. He was going to have to sit or lie down soon, or it was going to hurt to walk. “Shepard, can I, um—? I’m just going to sit over here.” He awkwardly sat on the couch with his legs spread wide.

She turned to face him, and the sight of her bare breasts made his cock emerge its sheath completely. Her breasts were just so… there. They were so curvy and soft-looking, with her dusky nipples tipping them like little punctuation marks: distinctly alien to Garrus’s eye, but singularly beautiful.

She tilted her head in a way that read as ‘flirty’ to him. “You want it on the couch, huh? No problem.” She pulled the coffee table back, then started to drop to her knees.

“Wait,” he blurted. “Can you—? I’d, um, love it if you were naked for this. If you don’t mind.”

A smile curled her lips: a slow, heated smile that made the glands on his cock start to tingle. “I don’t mind at all. As long as you’re going to do the same.”

“That’s only fair.” He sat forward and pulled off his shirt, then stood up and pushed down his trousers. By the time he was naked and sitting on the couch again, Shepard was naked too, and she was sitting on the coffee table with her legs spread wide.

His neck went hot. Her smooth bare skin, her round breasts and hips, the black patch of curly hair that crowned her sex — and spirits, her sex: it was just as alien and lovely as the rest of her. It reminded him of the petals of an exotic plant, all dewy with her juices, and the fact that her sex was so exposed, with no pubic plates to protect and obscure it? There was something almost… show-offy, or exhibitionist-like, about the way her pussy was so visible as soon as she spread her legs, and the sight of it was making him wish he could just fuck her.

He forced his gaze from her pussy to her smiling face. “Shepard, you look…”

She held up a finger. “If you say that anything on me looks ‘supportive’, I will laugh. I’m just warning you.”

He chuckled. “‘Incredible’ was the word I was looking for, actually.”

“Well, that’s lucky. Because I was just thinking the same thing about you.” She slid to her knees in front of him and ran her palms along his inner thighs, then stroked her thumbs around his sheath at the base of his cock, just like he’d prompted her to do last time.

A shiver of pleasure pulsed in his cock. Then Shepard spoke, still while caressing the base of his shaft. “Turians don’t do blowjobs, right? Or is that a bad assumption on my part?”

“It’s — not an assumption,” he said, a little breathlessly. “Our mouths aren’t really, um, suited to…” Fuck, the way she was rubbing his sheath, it was making it hard to think. But he owed her an answer. “We can’t suck,” he finally said. “No lips, no sucking, no blowjobs. Licking, sure. But sucking? No.”

“That’s what I figured. I’m glad I asked, though.” She licked her lips — damn it, her lips really were beautiful — then gave him a mischievous look through the veil of her bangs. “You’re excited, huh? Your cock is already dripping.”

It took a huge effort for him to find the wits to reply. “It’s hard not to be excited when you’re staring at it like that.”

She treated him to another beautiful grin. “Well, let’s hope this lives up to the hype, then. Wish me luck that I don’t die.” She wrapped her hand around his shaft and parted her lips to — wait, what?

“Wait!” He covered his cock with both hands. “Hang on a second. Die? Mordin said you could die from swallowing my semen?”

She scoffed and sat back on her heels. “He said I could have an allergic reaction. And a severe allergic reaction could lead to anaphylactic shock and death. But that’s not going to happen.”

“But — Shepard!” he bleated. “How do you know that won’t happen?”

“Because the premise doesn’t make sense,” she said patiently. “If you didn’t die from eating me out, I’m not going to die from sucking your cock.”

“What if you’re wrong?” Garrus said anxiously. “Mordin is a doctor. Are you sure it’s a good idea to play fast and loose with what the doctor told you?”

“The only way to know for sure is to try it out,” she said. “And listen, if it makes you feel better, I brought up two epi-pens from the med bay, just in case.” She pointed to two small white-and-orange tubes on the coffee table, which he hadn’t noticed before. “If I do have an allergic reaction, all you have to do is jab one of those into my thigh and tell EDI to get Mordin up here stat. The second epi-pen isn’t necessary, but I figured it’ll make you feel better.”

He gazed worriedly at her. He wasn’t so sure he liked this idea anymore.

Her wry expression softened. “Garrus, it’s going to be okay. Even if I have an allergic reaction, it’s going to be okay. I planned for this, okay? But look, if you really don’t want to do this, I’m not going to force you. I just…” She shrugged. “Honestly? I wanted to make you come as hard as you did for me last time. Return the favour, so to speak. But if you’re not comfortable, I won’t push it.”

Damn it, she looked a little sad now. He sighed and squeezed her hand. “Don’t get me wrong. I love the idea of you going down on me. I just… don’t want it at the expense of your health.”

“I get it. Really.” She ran her palms along his inner thighs. Then she peered up at him again through her bangs. “What if I take it slow? Just start with, you know, a little lick of your precum?” She dropped her gaze to his cock, which was retreating back into its sheath a little bit. “You’ve got a lot of precum. I could just have a little taste of it to start. If I don’t have an allergic reaction, we could keep going. And if I do have an allergic reaction, we stop right away, use the epi-pen and call it a day.” She gave him a hopeful look. “What do you say?”

He hesitated. He really didn’t want to hurt her, but he also didn’t want to disappoint her by refusing her offer. And… ugh, if he was shamefully and totally honest, he really wanted to know what it would feel like to put his cock in her mouth.

He struggled with himself for another second. Then, finally, he nodded. “Okay. Let’s try it. Slowly,” he emphasized. “Just, um, a lick to start. And we’ll stick to a low threshold to stop, all right? If you feel even a slight tingle of a hive coming on, we stop right away. Agreed?”

“Agreed,” she said. “Now let me see if I can get your big gun back out of its holster here.” She started massaging his sheath.

He blinked at her. Then the joke clicked. He snorted a laugh. “Really? You’re calling my genitals a big gun?”

“It’s fitting, isn’t it?” she said with a grin. “A big, hard gun for my number-one sniper.” She rubbed her thumbs around the opening of his sheath in a way that made his pulse rise. Then, to his surprise, she dipped her head down and kissed his sheath — ah, that was her tongue, she was licking him!

The head of his cock popped out of the sheath, and her face lit up with a smile. “Hi there,” she said, and she trailed her tongue over the head.

He gasped, and his cock slid out of the sheath completely. He flexed his hips, wanting more — no, slow down, he had to wait now!

“Wait,” he said in a strained tone, and he rested his hand on her shoulder. “W-wait now, Shepard. See if you — if it feels, um…” Fuck, she was stroking his cock with her soft little hand and smiling at him in that warm-and-wicked way, and he couldn’t think.

He groaned and rested his head back on the couch, and she sighed. “Damn it, Garrus. You’re making this really hard for me.”

“H-hard…?” Argh, he felt really hard. She was making him this hard by stroking his cock so well. Was that what she meant?

“Yeah,” she said. “I really want to suck you off.” She caressed his sheath with one hand and ran her other palm up and down his length… Fuck, the softness of her hands, the strange dainty feeling of her human fist wrapped around him, it was driving him to distraction.

He groaned again and lifted his hips, and she made a soft noise: a whimpery, breathless little noise that prompted another pulse of precum to spurt from the glands around the head of his cock. “Garrus, I love it when you make that sound.”

“Wh-what… What sound?” he said. “You sound good.”

“No, you do,” she said. “It’s like you’re purring when you make that sound.” She lowered her head and rubbed her cheek against his inner thigh.

The softness of her skin, spirits save him… He moaned helplessly, and she lifted her head. “That sound,” she said. “That fucking sound. It’s like you’re purring.”

“Okay,” he panted. “I don’t know what ‘purring’ means.”

“I’ll show you a vid of a cat later. But first, can I suck you properly now?”

He forced himself to focus on her words. “You don’t have any, um, allergy symptoms?”

“Not even a hint of a tingle of a hive.”

He dragged in a deep breath. “Okay. Let’s, um… L-let’s try just one suck? Maybe? Is — is that the right terminology? One suck?”

“It is. One suck coming right up.” She slowly dragged her tongue up along his shaft.

He shivered. Her tongue was small but firm as it stroked up his length to the head, and then she was lapping at the head of his cock, licking off the glaze of precum that coated it, and she looked so damned sexy… Oh fuck, she was kissing his cock, kissing and lapping at the head, and he couldn’t decide if he was more entranced by the way she looked or the way she felt—

She angled her head and took him into her mouth.

He gasped and jerked. Her mouth was so warm and wet, like a tight little tunnel of heat, and her lips were closing around him — ah, she was taking him deep, she was sucking him hard—!

His cock nudged the back of her throat, and a shudder of pleasure wracked his body. The heat, the tight pull of her lips and the slickness of her tongue… Oh fuck, she was looking at him, she was staring into his eyes with his cock in her mouth!

She suddenly lifted her head and released him, and he groaned. “F-fuck. Shepard, please—” He clenched his jaw to shut himself up. He couldn’t beg her for anything now: he didn’t have the right. Not until they knew she wasn’t going to go into allergic shock.

He exhaled hard and let his head fall back on the couch again, and she made that sweet whimpering sound. “Garrus, this sucks…” She whimpered again and rubbed her cheek on his inner thigh.

“I know,” he said breathlessly. “But we have to be — mm, be sure that it’s safe…” Argh, she was rubbing his sheath — ah, she was stroking his cock again!

He groaned and shifted restlessly on the couch, and she let out a breathless little laugh. “Damn, Garrus. You look… fucking rideable.”

“Ride me,” he blurted. “You can — ngh, shit.” He rubbed his hand over his crest.

“Easy, big guy,” she teased. “We’re trying to test my hypothesis, remember? Mordin’s not the only one around here who can run an experiment.”

He gave her a pleading look. “I am begging you, do not talk about Mordin right now.”

Her face lit up with a grin. “Listen, I’m feeling perfectly healthy here, so I’m going to go ahead and finish you off now, if that’s okay with you.”

“O-okay,” he stammered. “But — just in case. The, um, the epi-pens. They’re…?”

“Right here.” She patted the epi-pens on the coffee table, then tilted her head in that playful way that made his blood feel hot. “Permission to suck you dry?”

He huffed a laugh. “Permission granted, commander. Go for it.”

“Great.” She kissed the base of his cock, then trailed her lips up along the length, and he gaped at her as her lips travelled up toward the head of his cock… Mm, she was sucking just the head of his cock now, fuck, it felt like she was pulling the pleasure toward the juncture of his thighs with the sheer power of her mouth!

He squeezed her shoulder. “Damn it, Shepard…”

She flicked her gaze up to his face. She angled her head, and without breaking from his gaze, she took his length into her mouth.

He shuddered and stared at her, his breathing ragged as he watched his cock sliding through her lush lips, watching her as she was forced to break from his stare to angle her head and take him deeper… Fuck, she was squeezing the head of his cock with her throat muscles! Her throat muscles? Or was that her tongue muscles? He couldn’t tell, he didn’t know what muscles she was using; all he knew was that it felt good.

He pumped his hips — it was an instinctive move, he couldn’t help it — and she gagged.

“Shit,” he gasped. “Damn it. I’m sorry—”

She shook her head slightly and grabbed his hips spurs, then rose up on her knees and angled her head to take him even deeper — ah fuck, she was squeezing him with her mouth and throat again!

He shivered and keened. “Shepard, I’m gonna go crazy here…”

She didn’t reply — obviously, since her mouth was otherwise occupied — but her nails dug into his hip spurs. She splayed her palms on his thighs, and then she was bobbing her head up and down, squeezing the head of his cock in the hot tight depths of her throat on every downstroke of her head, and he was — he — the way it felt, the way she looked, it was… Damn it, it was perfect. She was perfect.

His heart banged against his ribs, even as his pleasure ratcheted closer to climax. This woman — this human woman, who also happened to be his commander, and also happened to be his most steadfast friend: she was perfect. She was absolutely perfect, from her stunning alien looks to her rough-and-ready cursing, to the fact that she could deadlift his body weight, to her unshakeable conviction in herself and her squad. And of all the people she could have chosen to blow off steam with, this perfect, incredible woman was on her knees for him.

I’m the luckiest guy in the whole damn galaxy, he thought deliriously — and then he came.

It was so good that he lost his senses for a blissful minute. When he could breathe again, when his pounding heart slowed a little and he finally pried open his eyes, it was to find Shepard wiping some of his semen from the corner of her lips.

She licked her fingers and looked up at him, and a warm feeling swelled in his chest. Her cheeks were pink, and more of his cum was on her chin.

She smiled: a warm, mischievous little smile. “So? How was it?”

He leaned forward and tenderly wiped her chin with his thumb. “The best blowjob I’ve ever had. And that’s the honest truth.”

She laughed and smacked his hand. “The only blowjob you’ve ever had, you jerk.”

He chuckled and took her hands, then pulled her to her feet. Then he picked her up by the waist.

She blurted a laugh and grabbed his shoulders. “Hey! What’s the big idea?”

He set her down at the edge of the bed and kneeled at her feet, then cradled her neck in his hands and kissed her.

Kissing was another novelty that Shepard had introduced him to. When he and Shepard had sex for the first time, Garrus was afraid that she wouldn’t enjoy kissing him, since he didn’t have much to work with in the lips department. As it turned out, he had nothing to worry about. And from the way she was panting into his mouth and sucking his tongue right now, it was pretty damn clear that she liked what he was doing.

He slowly broke the kiss and leaned away from her. “My turn to experiment now,” he murmured. “I read and watched a few things that I’d like to put into practice, if you’re okay with that.”

“You’ve got my attention,” she panted. “What kinds of things?”

“Things like… this.” He nuzzled her breast, rubbing his nose and his mandibular plate against her: wow, her breast really was squishy. He’d never felt a body part that was so smooth and squishy before. But her nipple was firm, like a tiny rubber bullet.

He hummed in satisfaction and trailed the tip of his tongue over her nipple, like he’d seen in the vids. She pulled in a sharp little catch of breath and ran her palm over his forehead crest, and he glanced up at her. “Is this okay?”

“Definitely. Is it okay for you?”

“Oh, absolutely. Your breasts are nice. They’re very, um.” He hesitated. He wanted to say they were squishy, because they were, and he really liked it. But he had a feeling that ‘squishy’ wasn’t a very flattering adjective.

Shepard smiled. “What?”

Shit. What were some of the compliments they used in the vids? “They’re very… soft. And round. Sexy!” he added quickly. “That’s it, pure and simple. Very sexy.”

She laughed huskily and stroked his jaw. “You sound just like a human man.”

“Thanks? I think?”

She chuckled and rested back on her palms. “Feel free to use your lips, too. Maybe not your teeth, though. Your teeth are sharper than I’m used to.”

“Fair enough.” He lapped at her nipple with long strokes of his tongue — ooh, he could feel it getting harder under his tongue, now that was interesting. He palmed her breasts and licked her other nipple until it was hard, enjoying the way she was panting for breath and clenching her fingers in the sheets. Then, carefully, he encircled her swollen nipple with his tongue and squeezed it.

She gasped and arched her spine. “Oh fuck. Fuck, that’s — that’s hot.”

He looked up in alarm. “Hot in an uncomfortable way?”

She exhaled a laugh. “No, no. It’s a good thing. Human men can’t do what you’re doing. Their tongues aren’t long enough.”

His shoulders loosened with relief. “That’s what I thought. This was part of my experiment. I can’t really do much for you with my lips, but since my tongue’s got a better reach than the average human guy…”

She chuckled. “Very resourceful. I’d expect nothing less from you.”

“I aim to please. On that note…” He caressed the soft underside of her breast and traced her nipple with his tongue, then wrapped the tip of his tongue around her nipple and squeezed it again.

“God, Garrus…” She pulled in a shaky breath and opened her legs a little wider. “You can squeeze harder than that.”

He was more than happy to comply. He squeezed her nipple with his tongue and traced the other one with his talon to keep it hard, and when she was making that nice whimpering sound again, he shifted his mouth to her other breast and kissed her nipple, purposely pressing and tugging it with his lips as he did.

“Yes,” she gasped. She curled her hand around the back of his head and pulled him closer, and her fingers glided up to the underside of his fringe.

A hot shiver of pleasure raced down his spine. She was scratching just beneath his fringe now, and the delicious caress was making his cock sheath feel swollen again.

He grumbled happily and trailed his tongue over her nipple, and she let out a little laugh-moan. “You’re purring again. You’re a tits guy, huh?”

He gave her a wry look. “I don’t know what a ‘tits guy’ is, but if it means being all over you, then yeah, I am.”

She laughed and tilted her head back. “Goddamn, Garrus. The things you say sometimes? You really are a sweet-talker.”

Phew, that was a relief to hear. He was always a little worried that he was going to say something stupid, especially since the sight of a naked Shepard stole most of the blood from his brain. “Well, if it’s cool with you, I was hoping to do something else with my mouth other than talking.”

Her smile curled in a way that made his cock emerge. “Something else like what?”

“Like… adding more proof to your no-allergic-reactions hypothesis when it comes to human-turian oral sex.” He gave her a mock-innocent look. “We already know that your, er, juices don’t make me allergic. But it never hurts to prove the same thing twice, does it?”

Her smile widened into that heart-melting grin. “No, it does not. In fact, I think the more data we collect to prove my hypothesis, the better.”

“I completely agree.” He gave her nipple one last nibble with his lips, then pushed her thighs apart.

She pulled in a tremulous breath. “Garrus, you’re hard again.”

“Mhm.” He rubbed his face against her inner thigh… Spirits take him, her skin was so fucking soft. And she smelled so good that it was making his mouth water. There was something about the scent of her sex that was so… organic, somehow, compared to turian women. Both scents were pleasant, but the uniqueness of Shepard’s scent turned him on so much that he could feel the glands on his cock leaking precum again.

First things first, though. He wanted to make Shepard cry out with pleasure the way she did last week: the way he’d been dreaming about every day since then. He nuzzled and kissed the tender skin of her inner thigh — oops, he’d nipped her by accident.

She gasped and grabbed the angle of his jaw, and he lifted his head. “Sorry. I’m so sorry, that wasn’t what I meant to—”

“Again,” she commanded. “You can do it again. You can nip me there with your lips. I like it.”

She did? She liked being nipped right next to her pussy? Then he was more than happy to oblige. He hummed contentedly and kissed her thigh again, lapping lightly at the soft crease of skin right between her thigh and her groin — mm, her juices, the way they were ever-so-slightly sweet…

He lifted his head — oh, her cheeks were flushed again, she was fucking lovely. “I hope this isn’t insubordinate to say, but your pussy is damn delicious.”

She laughed: a breathless and beautiful sound. “Relax with the sweet talk, Casanova. You’ve already got me naked. Just do your thing already.”

He had no idea what a ‘Casanova’ was, but he didn’t really care. He traced his tongue up along the cleft of her sex in a slow, luxurious path to her clit, and when she made that moaning-whining sound again, his cock pulsed with another surge of precum. He pressed her thighs wider and caressed the petals of her sex with the body of his tongue, tracing the tip of his tongue around her swollen clit with every pass… Fuck, the sounds she was making, all high-pitched and husky? It was like she was rewarding him for his efforts, rewarding him for giving her the slip-and-slide caress of his tongue, and damn if he wasn’t enjoying the privilege — ha, yes, that’s what this was! It was a privilege to be here doing this, taking Shepard’s flavour on his tongue while she honoured him with those incredible gasping-moaning sounds. And he couldn’t wait to see her face when she came. The way her face twisted with pleasure, her mouth open and her eyes squeezed shut as she cried out in that ecstatic way: he had never seen Shepard looking like that before — hell, he’d never seen any woman looking like that before — and the memory of her orgasm had been living right at the front of his brain for the past week. He couldn’t wait to see it again now, to put that look on her face again while lapping at her pussy and caressing her clit with his tongue, and he could feel his cock thumping with excitement at the thought of making her come…

She gasped and thrust her hips toward his face. “There! Do that! That — that up-and-down thing over my clit? Do that, keep doing that!”

He did as she’d commanded, pressing the middle portion of his tongue against her clit and gently rocking it up and down, and she shuddered under his palms. “Fucking hell, Garrus, you’re so — mm, feels fucking amazing…”

A warm feeling of pride swelled in his chest. He kept rocking the body of his tongue against her clit just the way she’d asked, and on a curious whim, he pressed the tip of his tongue into her entrance.

She gasped again and jerked her hips. “Fuck! Oh my god, fuck, yes!”

Spurred on by her response, he pressed his tongue a little deeper, as deep as he could while maintaining the rocking motion against her clit. She made a sound that was almost like a sob and curled her fingers around the back of his neck. “God, I fucking needed this,” she moaned. “You don’t understand how much I’ve been wanting this.”

His heart flip-flopped. She’d been wanting this too? That was—! Honestly, it was a relief. He knew that his arrangement with Shepard was more about blowing off steam than anything… emotional, so to speak. But if he was completely honest, he’d been hoping that… Er, not that her statement meant she was looking for anything emotional too—

“Fuck,” she gasped, and her nails dug into the sensitive spot just below his fringe — ngh, that felt good. “Garrus, I’m going to — d-don’t stop, I’m going to come…”

Never, he thought. I’ll never stop. Not as long as you want me. He kept rolling his tongue over her clit in the up-and-down way she liked, moving the tip of his tongue within her entrance too and imagining how great it was going to feel to get his cock inside of her after she came…

Yes,” she gasped. “Yes — fuck ah, a-ah!” Her nails pressed hard into the base of his fringe. She was crying out in that incredible way, her thighs trembling under his palms as she thrust her hips toward his face, almost like she was trying to fuck his tongue—?

Ooh. Well, now that was an idea. He angled his head and pressed his tongue deep inside of her in a smooth thrust.

Ah! Fuck me!” she burst out. “Garrus, fuck me, I need you right now!”

He withdrew his tongue. “How do you want me?” he panted. “I’ll fuck you however you want.” She’d ridden him the last time, which he’d been grateful for; he’d been so nervous that it was a boon to have her taking control. But he didn’t feel a single bit nervous right now. All he wanted was to get as deep inside of her as he could reach, and he didn’t care how it happened, as long as he could hear her making that incredible orgasm sound again.

She pushed herself onto the bed. She rolled onto her elbows and knees, then looked over her shoulder at him. “Fuck me like this.”

He gaped at her. He’d seen this position in the vids, but he’d never had sex in this position before; the angle of entry didn’t work well for turian women. But once again, the vids didn’t do Shepard justice, not in the slightest. Her smooth round butt was so alien-looking and so fucking beatiful. He could see her anus, which felt a little obscene in a way that only excited him more, and her slick pussy — fucking spirits take him, she was dripping juices onto the bed.

His cock throbbed. He stumbled over to the couch to grab a condom from his trousers, and then he was crawling onto the bed behind her and hastily rolling the condom on and squeezing her ass — ah, so squishy and soft! Not as squishy as her breasts, but soft and round enough to make him want to bite her… Fuck, he wanted to bite her and fuck her and lick her all at the same time, he felt like a damn varren during mating season.

He grabbed the base of his cock and rubbed himself against her slippery-wet cleft, and she shivered and arched her spine in a way that looked like a varren female in heat. “Garrus, come on, I need you to fill me up—”

He gripped her hip and pushed his cock inside of her all the way to the hilt — fuck yes this was bliss.

“Yes!” She pounded her fist on the bed and arched her neck. “Oh my god, Garrus, fuck—

He slowly pulled out of her, then thrust into her hard and fast, and she burst out a sobbing sound. “Fucking Christ, you’re so deep, ah!

He groaned and pushed his pelvis against her soft round ass… Damn it, she was so soft, and it was making him feel absolutely feral. He’d never felt such a smooth soft body before, and the fact that it was Shepard’s smooth soft body beneath him was… surreal. It was honestly surreal, in the best of ways. Shepard was not a soft person in the field, not by any stretch of the imagination, and the privilege of seeing and feeling how soft she was right here in her bed: holy spirits, she was really something else. She was moaning and whimpering as she rolled her hips back to take his cock, her knuckles white as she clenched her fists in the sheets, and Garrus couldn't help himself: he was pumping into her fast and hard, meeting the bucking rhythm of her hips and relishing in the pleasured moan-cries she made every time his cock struck deep, relishing how tight and slick she was around his rock-hard cock, relishing in everything about this moment: how she felt, how she sounded, how she looked, so curvy and smooth and soft… Ngh, he wanted to feel her skin. It was like he was addicted to the feeling of her skin, and he was desperate for more.

He folded over her back and wrapped one arm around her — mm, yes, the smooth skin of her back against his chest, the smooth-yet-firm feeling of her abs under his arm, this was it. He thrust into her and growled his pleasure against the back of her neck, and she shuddered beneath him. “Bite me,” she gasped. “Bite my neck, my shoulder, whatever you — Garrus, you can bite me, I want you to—!”

He didn’t hesitate. He bit the juncture of her neck and shoulder and slammed his cock deep inside of her.

“Yes!” she yelped. “Fuck, yes — ah, Garrus, don’t stop, don’t stop!”

He didn’t stop. He kept fucking her deeply, hard and eager thrusts that felt like fucking bliss every time he struck into her depths. When she dropped down so her cheek and chest were flush to the bed, he came down with her, hugging her around the waist and licking the salt from the back of her neck — ngh, the taste of her sweat, the plush-yet-elastic feeling of her skin giving way beneath his lips and his sharp front teeth, yes. He was fucking her fast and hard, she was making the most incredible high-pitched mewling sounds… Ah, was she tightening around him? Was she…? Fuck, her pussy was clenching around him, her body was bearing down around him and she was trembling, it felt so good, he was going to come, fuck—

“Garrus, y-yes, ah!” She burst into tears of ecstasy, and the throbbing tightness of her climax pulled him right along over the edge.

He shuddered and slammed his hips into her perfect ass — ngh, he couldn’t stop fucking her, he couldn’t bear to stop. He fucked her through their shared climax, groaning and nuzzling her shoulder and pressing his teeth into the back of her neck. And it wasn’t until the bliss of his orgasm started to wane that he realized she was bleeding.

His heart sank. It was just a little blood, caused by the puncture marks of his front teeth, but it was enough to make him feel ashamed. “Shepard, I… Shit. I made you bleed.” He sat back on his heel spurs and gingerly traced his finger beneath her bite marks. “I’m really sorry.”

She laughed: a soft, breathless sound that immediately soothed his guilt. “I don’t mind at all. I mean that.” She lifted her head and smiled at him over her shoulder. “You know what, it’s actually a good thing. Did you lick some of my blood?”

He winced. “Um, yeah…”

“Good. That’s more proof that we don’t have allergic reactions to each other’s fluids.” She treated him to a mischievous smile. “You know what the next step is?”

“What?”

“You coming inside me. It’s responsible of you to use condoms, but we’re both clean. And let’s face it: you’ve already got my juices on your cock. We might as well take things the whole way next time and see what happens when you come inside of me, right?”

His heart flipped. She was inviting him to actually come inside of her? Wow! Then he could see it trickling down the insides of her thighs — woah, maybe she would let him come on her chest, so he could see it on her breasts!

Shepard tilted her head. “Garrus? You okay?”

“Uh, yeah. Just, um, imagining the scenario you described.”

“Imagining it in a good way?”

He smiled wryly. “Let me put it this way: my cock’s coming out of the sheath again already.”

Her face lit up with a smile. She rolled over onto her back and gave him a coy look through her now-dishevelled bangs. “Well, if that’s the case, what say we put the hypothesis to the test right away? For science, of course.”

Spirits save him, she was perfect. He settled between her legs. “Well, if it’s for science, how can I say no?”

She draped her arms around his neck. “Mordin would be proud of you.”

“Do not mention Mordin again while we’re naked. I’m honestly begging you.”

She laughed, and his heart lifted at the beautiful sound: one of his favourite sounds in the galaxy, if he was honest. He lowered his mouth to hers for a kiss, and for the rest of the afternoon, he and Shepard enjoyed a few more bouts of very thorough hypothesis testing.

*************

Later that day, Garrus followed Shepard to the research lab. They entered the lab, and Shepard wasted no time in making her announcement. “Mordin, I swallowed Garrus’s semen, and I feel totally fine.” She jerked her thumb at Garrus, who was silently wishing he could sink into the floor. “He swallowed my genital juices too, and a little of my blood. And he ejaculated inside of me, too. So you can consider your whole anaphylactic-reaction theory debunked.”

“Excellent,” Mordin said. “Pleased to hear it. Pending your consent, would like to perform a clinical assessment of your oral and genital mucosa, as well as collecting blood and saliva samples from both of you.”

Shepard frowned. “Wait. You want to assess our genitals?”

“Yes,” Mordin said briskly. “How long ago did you complete your last round of coitus?”

“Why does that matter?” Garrus said suspiciously.

“Data collection. More precise data will make for a more replicable case study.”

“Case study…?” Shepard’s eyebrows rose. Then she propped her fists on her hips. “Mordin! Are you trying to write a case study about me and Garrus?”

“Yes. First-ever in-depth analysis of human and turian autoimmune response to oral and genital exposure to cross-species bodily fluids.” He nodded approvingly to Garrus. “Very pleased to hear that you ingested some of Shepard’s blood. Scientifically thorough on your part. Shepard, perhaps you would be willing to do the same.”

“What, right now?” she demanded. “You want me to drink some of Garrus’ blood right now?”

“I think I’m going to be sick,” Garrus remarked.

Mordin chuckled.

“Mordin!” Shepard exclaimed. “You conniving sneak! You have been pranking us this whole time, haven’t you?”

“Not pranking. Social experimentation with side effect of humorous results,” he said pertly. “Based on your intolerance for ‘bullshit’, as you would say, hypothesized that being told a ludicrous statement would challenge you to prove it wrong. Hypothesis has been proven correct.”

She folded her arms. “Let me get this straight. You purposely fed me misinformation knowing that I would make a point to disprove it? And you did this all for a laugh?”

“Not entirely for a laugh. Advancement of knowledge about turian-human relations was the primary goal.” He scratched his chin thoughtfully. “Joke perhaps only humorous to me, in retrospect. Humour aside, there is a pervasive belief even among salarian medical professionals that dextro and levo interspecies coitus will result in detrimental autoimmune responses. Complete nonsense, of course,” he said dismissively. “Pseudoscience. Humans frequently ingest foods with dextro properties, and vice versa for turians. No logic to the belief that turian semen will trigger allergic reactions in humans. Likely originates from racism more than anything else. In any case, if you did wish to assist me in debunking the belief once and for all, would be delighted to write the case study pending your cooperation.”

Garrus gave Shepard a pleading look. “He’s still joking, right?”

“I don’t think so,” Shepard said wryly. “Mordin, we’re going to take a pass on being your case-study guinea pigs for now.”

“Understood, albeit an unfortunate choice. Would urge you to reconsider. Your sexual activity could be the foundation for a groundbreaking advancement in scientific thinking. Will be here if you change your minds.” He turned back to his science equipment while humming to himself.

Shepard smirked at Garrus and nodded toward the door. They left the lab together, and when they were alone in the corridor, she folded her arms. “Mordin’s clowning-around notwithstanding, I’m not sorry that we spent our afternoon experimenting.”

“Me neither,” Garrus said. “It was… fantastic, honestly. A great way to unwind.”

“That it was,” Shepard said. She was smiling up at him, and the warmth in her blue-black eyes made his heart feel like it was thrumming… Oh, spirits. This thing he had with her, the way he felt when he and Shepard were alone: for Garrus, this was about more than just blowing off steam, and he knew it. Whether Shepard felt the same way, though? Now that was something he wasn’t sure about. And it wasn’t his place to add that complexity to their friendship, not when they were gearing up for a life-and-death mission in the very near future.

Feeling a little awkward now, he scratched his scarred right cheek and took a step back. “I’m going to, uh, work on optimizing some firing algorithms before dinner. I’ll catch you in the mess hall later?”

“Sounds good. And hey, if you’re ever in the mood for a little more hypothesis testing, you let me know.”

His heart lifted. “Definitely. I, um, I’ll let you know. But yes, definitely.”

Her smile widened, and he had to fight the urge to kiss her beautiful smiling mouth right here in the public corridor. She clapped him on the shoulder. “Take it easy, Garrus,” she said, and she headed for the elevator.

He watched her wistfully as she walked away. But hey, at least now he could initiate the invitations to spend time together, rather than waiting and hoping for the proposition to come from her. And he sure hoped she would be in the mood for another encounter sooner than later, because ‘hypothesis testing’ with Shepard was in danger of becoming one of his favourite leisure activities.

He chuckled to himself. “Hypothesis testing. Damn Mordin,” he muttered. And with a spring in his step, he made his way back to the main battery for some calibrations.