I'm going to go a head and level with you, this is going to get updated pretty sporadically. The whole story is planned out in note form but hasn't entirely been typed up.

The title for this fic comes from a Plato quote:
Human behaviour flows from three main sources: desire, emotion, and knowledge.

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Ever since Isaac had abruptly suggested they had 'sexual relations' in the mess hall it had been all Alara could think about, she just couldn't get it out of her head. It just sat there at the forefront of her mind waiting. At first she'd been freaked out and strangely violated, he'd literally just asked In front the entire bridge crew, blunt and outright, as though he'd asked her to pass the salt. Even Malloy had been at a loss for words.

Two weeks the Kaylon's words had circled around her head, Isaac was the one person she couldn't hurt aboard the ship and as awkward as it was to admit there was something attractive about him... maybe it was the deep voice?

Slowly Alara's interest had grown and evolved into some kind of want. And two weeks was her limit, she had urges, needs, and Isaac seemed to be the only person interested in helping to relive them. Had she really grown so desperate that she was considering having sex with Isaac? This was going to be awkward.

It didn't take her long to find the Kaylon in the engineering section just before her sift started, he was stood at a console before the large blue circles with his back to her. Chief Newton and Yaphit on the other side of the room inspecting an open panel that appeared to be burnt out, thankfully they were the only other people in the room and clearly engrossed in their work. Her nerves had been bubbling inside her since she woke up that morning but seeing him stood there they almost got the better of her, something inside Alara screamed at her to race to the nearest synthesiser and demand a shot of Xelayan Tequila but she refused; that wasn't the answer to everything.

With a deep breath the Chief of Security made her way over to Isaac and tapped him on the shoulder which, thinking about it, was pretty stupid. Isaac had internal sensors, he'd probably known she was there before she'd fully entered the room.

"Hi." She muttered awkwardly as he turned and greeted her with that somehow blunt but strangely pleasant and courteous voice of his.

"Can I help you with anything, Lieutenant?"

"Em, yeah, maybe, em. I was just wondering... do you remember a few weeks ago when you asked if we could, you know-"

"Engage in sexual relations?" She was thankful for his ability to just slice through everything and get to what she really meant, made things a lot easier on her end. "My offer stands, Lieutenant. If that is what you wish."

Silence hung for a moment but Alara nodded, she did want it, she did.

"Yes." This is actually going to happen isn't it, muttered Alara's mind; the tone contained only a hint of panic.

"Would after your shift on the bridge be amenable?" Enquired Isaac with a small gesture of his metal hands.

"Yeah, yeah, that's sounds good." Alara took a deep breath and stood tall, suddenly less terrified of her own wants. "Don't tell anyone."

"It will remain just between us, Lieutenant Kitan." He promised and had Alara not known any better she'd have thought there was sincerity in his robotic voice.

The Secretly Chief spent the rest of the day practically on autopilot, she pushed buttons and replied 'Aye Sir' when needed, other than that though she was blank, much too preoccupied up in her head on the fact that she and Isaac were actually going to... have sex. Had she made some huge mistake? What if it was the worst idea in the universe? Maybe she was over thinking it, either way it was too late to back out now.

Towards the end of her shift Alara started to feel as though she needed a bravery shot, she'd half expected the Krill to attack and put a halt to everything but no. All in all a very boring shift, Gordon hadn't even cracked any decent need for that shot buzzed at the back of her head but Alara was determined to do this sober, she knew one would lead to two, she needed to stay strong. It was just Isaac, nothing to worry about... or so she kept telling herself.

At the end of her shift Isaac left the bridge before she did, where he went Alara had absolutely no idea but she prayed that he wasn't waiting for her when she got to her quarters, thankfully he wasn't anywhere to be seen when she rounded the corner. The Xelayan breathed a sigh of relief and slipped through the door quickly. And what? Should she put some music on? Isaac probably wouldn't notice let alone care but still she felt as though she were meant to. After her internal debate Alara ordered the computer to play one of her favourite peices .

For a time she just stood there before the full length mirror to the left of her bed trying to decid if she should put her hair in front of her ears. Do they look too pointy? She'd always been self-conscious about her ears and though they stuck out too much; other than that she was pretty though, right? Suddenly Alara snapped back to the world around her, why did she care so much? Isaac only thought of this as an experiment, some new piece of data for his report to the Kaylon home world, he truly didn't care one way or the other.

Just as nerves started to get the better of her the door chime sounded, Alara clamped her eyes shut and forced herself to take a deep, calming breath. Show time. With a surge of courage she went to her door and let Isaac in. The Kaylon stepped inside easily as though he didn't have a worry in the universe, then again he couldn't feel so Alara supposed he never worried about anything. His head tilted when he registered the music, seemed she'd been wrong, he had noticed.

"I did not know you favoured Earth's classical music, Lieutenant." Was Isaac attempting small-talk or did he actually want an answer?

"Yeah," she began as though they were just having a chat amongst friends not two people about to have sex. "I like Xelayan music but I find classical music from Earth relaxes me."

Strangely the conversation took away some of her tension, her shoulders had been rigid and taught but after only a few sentence about something entirely unimportant Alara's muscles had relaxed.

"Lieutenant, might I enquire as to how far you wish this evening to go?" Isaac tilted his head.

The Xelayan was momentarily thrown by his question, somewhere in the back of her mind she'd expected him to just ravish her... of course that was ridiculous. Alara didn't quite know how to answer his question or what she'd expected from that. As her mind tried to form a sentence that actually made sense Alara sat herself down on her bed only for Isaac to sit beside her, he kept a respectable distance and she found herself thinking that Isaac, this emotionless robot, was more gentlemanly than most of the guys she'd dated.

"I'm not sure, Isaac." She admitted with her eyes downcast at her knees.

"Might I suggest that you inform me if you require us to cease our activities? I will of course end our experiment the moment you ask me to."

Not really knowing what else to say Alara nodded to herself, somewhat grateful for his understanding and almost caring words. There was a pause, silent but not uncomfortable and then he turned to face her properly.

"Would you permit me to touch you?" He asked and Alara looked up at his expressionless face; she nodded.

Isaac didn't share Alara's reservations, to the Kaylon he was simply gathering information on a subject that might have been of interest to his people. Sex had held no use to his species since they'd created robotic bodies yet it still held great importance to all other biological lifeforms, not just for procreation but for pleasure as well. He had heard his colleagues talking about how it relieved stress and joking with one another if their partner had been good or bad. Isaac had always assumed sex to be simply for the creation of new biological life but since boarding the Orville he'd learnt otherwise and wanted to – as Captain Mercer would say – 'see what all the fuss was about'.

Fully prepared for Alara to push him away he placed a metallic hand on her right knee and trailed his fingers up her thigh. Alara gasped, little electrical bursts radiated outwards from his touch, it warmed her body and before the Security Chief knew it heat had started to pool between her legs. How the hell did he do that just by touching my leg? Her mind demanded. Slowly Isaac helped her to lay back against the blue pillows, almost instinctively her legs fell open as Isaac's hands continued to explore her. No one had ever touched her in such a way before, most guys just wanted to get to the main event but Isaac caressed her body as though she were a mystery to be unrivalled, as though each inch were a marvel.

For a man made of metal his touches were soft gentle and quickly Alara started to wonder how much research he'd done on sex, it felt almost as though his fingertips sent out waves of pleasure, small and localised but they had quite the effect on her. Whatever she'd been expecting from the whole encounter she'd not expected this. This want.

Suddenly she was on fire, needed her clothes off and her pleasure to build. Alara ripped off her red uniform while Isaac carefully removed her boots and, after a nod from Alara, her pants as well. All his movements were gentle as though he half expected her to change her mind and demand he stopped but she didn't, wouldn't, all that fear she'd had while on shift had evaporated after only a few moments of Isaac's alien touch. She wanted this, she wanted him.

When Isaac rose to his feet Alara's dark eyes shot open to see the silver science officer tidying up her discarded clothes, she'd just tossed them anywhere but there was Isaac slowly picking up and folding her uniform; each item placed neatly on her dresser. Before she could utter a single word of complaint Isaac was back, leant over her body with those radiating waves of electricity caressed her body. It was almost like dropping a pebble into a pool, one smooth, hardly there action that radiated outwards in all directions until it subtly faded away.

"Is that acceptable to you?" Asked Isaac, his silver body over her porcelain one as his mechanical fingers raked up her flank to push her black top off as well.

This was really happening.

Isaac made to fold her top as well but Alara grabbed it from him and simply tossed it with an unwavering look in her eye. She didn't want those heated sparks to leave her body, thankfully the Kaylon seemed to understand that, he really had been learning.

"Am I allowed to touch your-" She'd had enough of his long winded questions and cut him off.

"Yes!"

Alara just wanted, wanted to experience more, and felt as though he were teasing her which – when she thought about it – was silly, she seriously doubted he would ever think to tease without prompting.

Isaac's large hand slipped up her inner thigh parting her legs obscenely as he committed every inch of her to memory; for his report or his own satisfaction she neither knew nor cared. Without warning a metal finger slipped inside her wet core almost gently, she gripped the sheets, nails digging in with so much force that the sound of fabric ripping filled the room.

"There's no need for you to hold back with me, Lieutenant. You are unable to inflict pain or damage me in any way."

Alara wasn't used to that, not having to control her strength every second of every day and there was something strangely comforting about his words.

Her legs opened wider as Isaac crawled up the bed onto his knees until he was directly over the top of her, blue lights in place of eyes seemingly watching her every movement. He prompt himself up on one hand as the the circled her core, a finger dipped into her and Alara all but cried out.

"Your heart rate has increased dramatically as has your respiration." There was a momentary pause. "'Moaning' is a word that means two entirely different things, one meaning is to suffer, the other is to experience sexual pleasure. I have come to learn that pain and pleasure sound entirely different but can actually be a very similar entity. Might I enquire as to why biological lifeforms are so vocal?"

Alara didn't answer, she'd hardly listened to a word he's said, just gripped his shoulders in desperation for more.

"Please, Isaac."

She begged and the Kaylon seemed to understand – thankfully – and thrust a second metal finger into her wet heat, stroked along her glistening folds. She moaned, loud and needy, a sound Isaac had never heard from anyone before; it was truly unique.

She'd expected Isaac to be cold but as she clung to his silver shoulders – hips bucking without her consent and head thrown back on the cool pillows – but he wasn't, the Kaylon certainly wasn't warm like one would expect of a biological organism but not cold either, maybe Alara's burning desire had warmed him.

The dark-haired Xelayan rocked her hips impatiently pushing back on his smooth fingers, the metallic digits stretching her open. Alara's whole body pulsed. She could feel Isaac's body against hers as her hips thrust up against his large hand, faster and faster, closer and closer to the end... to the bliss she so craved. It was like standing at the top of a cliff, right on the edge of her climax. She needed this, she wanted this, wanted him. Closer, harder, faster. Until, with a shout, Alara came.

"Fuck! Isaac!"

She threw her head back against the pillows as bliss rocked through her body. Slender fingers clung to his shoulders in a vice-like grip, so tight but he didn't so much as flinch, she'd let go and felt rather than worrying about hurting her partner... and it had been freeing. Alara rode out her orgasm with gasps and mews of pleasure.

Afterwards the Security Chief collapsed against her bed, limbless and panting. Isaac sat on his haunches as though analysing all the data she'd just helped him collect – probably because he was – and made no attempt to touch her further, whether he believed further physical contact wouldn't be welcome or if he just thought that their encounter was over so nothing more was needed Alara didn't know.

"Was our encounter successful? You achieved orgasm and appeared to enjoy yourself." Said Isaac flatly... it killed Alara's high almost instantly. "Was your reaction to orgasm standard amongst organic lifeforms?"

"Yeah, it was good. And what do you mean 'standard'?"

"You used an expletive and yelled out my name. Is this a usual reaction to orgasm?"

Alara's brow furrowed as she stared at him. He'd just made her cum and then wanted her to basically fill out a report.

"I don't think girls are crying out your name, Isaac, but yeah, stuff normally gets yelled."

"Ahh, thank you for your assistance in this matter, Lieutenant, it has been most enlightening. I will add it to my report to Kaylon, of course I will not mention your name if that is your preference. I will..."

Isaac just kept talking, Alara shouldn't have been surprised to find he had no idea about post-sex conversation, then again most guys she'd had sex with had just fallen asleep afterwards. Somehow he got on to the subject of endorphins released during her climax and she'd not been able to take it any longer, he'd killed her euphoria and wouldn't shut up.

"Get out, Isaac."

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Thank you for reading!