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Mar 15, 2025

A Day to Gamble

DISCLAIMER: Another smutty creation done by my other half (the fic, not the drawing) and part 1 of ??? in the "Kate x Jack" series :D Both characters belong to my hubby, I only borrow them for my drawings :3

pairing: Imperial guard on guard action.

warning: see above. It's smut (NSFW), with a thin layer of a plot thrown on top of it. MDNI! Some typos may still lurk around. If you find one, adopt the poor sucker.

Wordcount: 4952

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Life as an imperial guardsman is easy—if one arrives in a warzone a year too late. Bureaucratic error, warp travel discrepancies, or simple Administratum oversight had dumped the 121st Korvin Rifles onto a planet where the war had already ended. What remained was a smouldering ruin of hive spires, half-collapsed Manufactorums, and endless lists of menial tasks. Jack, like many in his regiment, had nothing to do.

Well, nothing to do was a bit of a stretch. Training was still mandatory, but even the most creative officers and drill sergeants could only come up with so many variations of the same battle drills before they, too, got bored. Even the regiment's Commissar—usually a hawk-eyed enforcer of discipline—seemed to have lost some of her usual fervour. The best part? As far as Jack could tell, the Administratum had seemingly forgotten about them. No new orders. No redeployment notices. No reminders that they even existed.

In some strange way, it was the closest thing to a vacation a guardsman could ever hope for.

"Oi, Jack. You up for a round of Death or Bless?"

Jack turned his head just as Kate popped up next to his bunk. She had to jump onto a ration crate just to reach his top bunk—something that never failed to amuse him. At barely five feet, she was one of the smallest in the platoon, but she made up for what she lacked in stature in sheer presence. Sharp features, large, ever-curious eyes, and a lean, athletic build sculpted by years of military service. She was a rare sight in the Astra Militarum: beautiful, full of life, and still capable of being amazed by the galaxy around her.

Jack had often entertained the thought of something more between them. But the reality of it stopped him. The Commissar would definitely have them flogged if she suspected anything unprofessional. And even if they could get away with it, what would happen when they got deployed again? When life expectancy dropped to weeks or even days? No, bad idea. Better to keep things simple.

"Nah, I'm good," Jack muttered, avoiding her gaze.

"Frak's sake, no one's in the mood," she groaned. He could already picture her pouting face. "Come on, Jack!"

"Nope. Last time, the Commissar nearly caught us, and I'm already on thin ice for 'acquiring' that contraband Amasec for the squad."

Kate smirked at that, then leaned in conspiratorially. "I know a place—no one will find us there. And I learned a new game."

Jack raised an eyebrow. "Where?"

"You know how one of the servitors broke down while cleaning the ventilation shafts?" she whispered. "Turns out they forgot to seal it back up. I went looking, and there's a room inside the vents big enough to park a Chimera."

Jack scoffed. "A room in the vents? That's groxshit."

"No, really! Join me, and I'll prove it," she insisted, grinning.

Jack hesitated. But then he made the mistake of looking into her eyes, brimming with mischief and challenge. He felt weak. So damn weak.

"Fine," he sighed. "But if you're lying, you take my latrine duty for a week."

"Deal!" she chirped, practically bouncing off the crate. "Come on!"

Jack rolled out of his bunk, closed some buttons on his uniform and checked the sidearm holstered at his belt. He didn't know what he expected to find in that so-called 'vent room'—but deep down, something told him this was going to be far more interesting than just another card game.

***

Jack followed Kate through the dim corridors of the hab block, their boots barely making a sound against the metal flooring. The maintenance corridor she led him to was mostly deserted, save for the occasional tech-priest or servitor shuffling about their inscrutable tasks. A few crew members passed by, their expressions hollow with the thousand-yard stare of those who didn’t know what to do, when there was no war.

Kate waited for the right moment, then with practised ease, she pried open a loose ventilation grate and slipped inside.

Jack hesitated for a moment, throwing a glance back down the hallway. The Imperium had strict regulations about unauthorised access to maintenance shafts—anyone caught snooping around places they weren't supposed to be could easily be accused of sabotage. But still, curiosity, and Kate's undeniable charm, won out. He ducked inside, carefully pulling the grate back into place behind him.

The vents were tight, forcing them to crawl single-file. The passage was barely illuminated, the only light coming from the occasional dim lumen strips bolted to the walls. It was an oppressive space filled with the lingering scent of dust, metal, and machine oil.

Yet, all became a distant memory once Jack realised what he had in front of him: a view he had only been dreaming of so far.

The standard-issue fabric of Kate´s trousers, stretched taut over her hips and thighs, outlined every subtle curve with merciless precision. The swell of her buttocks pressed against the material as she moved, the snug fit accentuating their perfect roundness. With each slow crawl forward, the muscles in her legs flexed, her inner thighs straining against the fabric as she pushed herself onward. The faintest outline of her most intimate curves teased against the snug, war-worn cloth, sending a traitorous heat coursing through Jack's veins.

His breath hitched as his fingers curled slightly against the metal floor, fighting the urge to let his gaze linger too long. It was torture—pure, exquisite torture—to be trapped behind her in such close quarters, to watch as her body shifted with unconscious grace, oblivious to the effect it had on him.

He clenched his jaw, forcing himself to focus, but the temptation was overwhelming. The way her hips rolled slightly with each movement, the way the fabric of her trousers clung to her thighs as they pressed together, it was a sight so maddeningly distracting that even the Emperor's sternest sermon on purity wouldn't have been enough to quell the thoughts creeping into his mind.

Jack swallowed hard, his pulse pounding in his ears. He was a soldier of the Astra Militarum, trained to withstand war, fear, and even the horrors of the Warp. But right now, this was the greatest test of discipline he had ever faced.

Throne, get it together, Jack scolded himself, forcing his eyes away.

"We're nearly there, just around the bend," Kate whispered, her voice barely audible over the hum of the ventilation systems.

Jack nodded, willing his mind back to more appropriate matters—like why an entire room was supposedly hidden in the vents.

Kate led him around a sharp corner, and suddenly, the cramped metal shaft opened up into a concealed chamber.

Jack blinked in surprise. The room was far larger than he had expected—big enough to hold their entire squad and still have space to spare. Makeshift furniture had been arranged within: a table, several scavenged chairs, and even a few lumen strips that had been jury-rigged into the walls. Cables ran from exposed conduits, powering the lights and creating a dim but functional glow. Someone had clearly spent time setting this place up.

"What do you think?" Kate asked, stepping into the centre of the room with a proud grin, arms wide as she took in the space around her. "I made some improvements—figured we needed a place where the squad could meet up without brass breathing down our necks."

Jack whistled. "I'll admit, I didn't believe you. But this… this is impressive."

Kate smirked. "Told you. Now, take a seat—I even managed to save some of your stash."

Jack raised an eyebrow as she disappeared behind a stack of crates. "You did? I thought the Commissar confiscated all of it."

Kate reappeared, holding a dusty bottle of Amasec and two dented tin cups. "Nope. Turns out I'm sneakier than you give me credit for."

Jack let out a short laugh, taking a seat as she filled both cups to the brim.

Kate lifted hers in a mock toast before downing the entire thing in one go. She exhaled sharply, shaking her head as the alcohol burned its way down. "Throne, that's good. Best one you've 'acquired' so far, Jack."

Jack took his own cup and sipped more cautiously. The Amasec was strong, warming his chest instantly. He leaned back, watching as Kate poured herself another.

A part of him was still processing just how much effort she had put into setting this up. He had always known her to be bold, but this? This was something else.

And if she was this good at sneaking things past him… what else was she hiding?

Jack sank into his chair, not being outdone by Kate he too decided to downing his drink in one swift motion. This second more fecund burn of the alcohol was welcome—anything to clear his mind of the lingering heat from their crawl through the vents. But even as the fire settled in his chest, the image of Kate's perfectly sculpted rear, framed so exquisitely by her fatigues, remained seared into his thoughts.

He exhaled, setting the cup down with a dull clink against the table. Focus.

"So, what are we playing?" Jack asked as Kate casually refilled his cup, her fingers lingering on the rim for just a second too long.

"A game I heard about and wanted to try," she said, her lips curling into a smirk. "You draw two cards. Closest to twenty-one wins. You can either discard one and draw another or throw both away and take a fresh hand—but only once."

Jack nodded. "Easy enough—"

She leaned in slightly, her voice dipping into something more playful. "However… if you lose, the winner gets to claim something of yours." Her grin turned downright mischievous.

Jack chuckled. "Damn. Good thing I left most of my valuables back in the barracks."

Kate shrugged, swirling the amber liquid in her cup. "It's just a test round anyway. So, let's keep it simple—we can only bet what we have on us." She reached down, unhooking a sheathed dagger from her belt and setting it on the table. It was a fine piece, its blade engraved with intricate markings, likely a personal keepsake.

Jack whistled. "That's a nice knife."

"And what about you?" Kate raised an eyebrow.

Jack tapped the holster on his hip. "Las-pistol good enough?"

She grinned. "Sounds good. Let's play."

They each drew their cards, counting in silence. Kate glanced at her hand, then tossed one card aside, drawing another with a confident smirk. Jack, however, frowned at his. Six? Not enough. He discarded his entire hand and drew fresh cards. Lady Luck favoured him—twenty-one, dead on. His face remained unreadable, years of card-playing discipline kicking in.

"Three… two… one!" Kate announced, flipping her hand.

Nineteen. Not good enough.

Jack revealed his own, flashing the perfect twenty-one with a knowing smile.

"Frak!" Kate cursed, knocking back another sip. She picked up the dagger, twirling it in her hands before sliding it across the table toward him. "Again! This time, you choose the stakes."

Jack eyed her thoughtfully, letting his gaze flicker over her. The game had barely begun, and already, a certain tension lingered in the air. He leaned forward slightly, smirking. "Your jacket. For your dagger."

Kate hesitated, just for a second, before grinning. "Deal."

The game continued. Round after round, the Amasec flowed, and Kate's luck remained stubbornly against her. Jack, however, played with a seasoned gambler's cold, calculating patience.

Her jacket was the first to go, revealing the snug-fitting undershirt beneath. Then, her boots left her in just her socks. Then, her belt. By the time her socks were forfeited as well, she had slumped slightly in her chair, the booze clearly working through her system.

Jack wasn't exactly sober himself. His limbs were pleasantly loose, his mind buzzing with warmth—but even through the haze of alcohol, he couldn't help but enjoy this little game of theirs. Kate, ever the stubborn fighter, refused to admit defeat, and her competitive streak only fuelled the tension between them.

She refilled her cup again, cheeks flushed—not just from the drink but something more profound.

Jack leaned back in his chair, watching her with amusement. "Still feeling lucky?"

Kate smirked, brushing a few stray strands of hair from her face. "I never back down from a challenge."

Jack's gaze flickered downward. She was running out of things to bet. And judging by the way her pupils were slightly dilated, she knew it too.

Jack hesitated, gripping his cup as he tried to steady his thoughts. The room felt warmer now, though he wasn't sure whether it was the alcohol or the sight before him.

"So, what do you want to bet next?" Kate asked, her voice laced with defiance and a playful challenge. A mischievous smirk danced on her lips, her confidence undeterred despite her losing streak. "Sooner or later, I have to win something! And believe me, when I do, I'll take everything from you." She let out a soft, husky laugh.

Jack leaned forward, mirroring her grin. "Well, if you're that eager—your shirt is next."

Kate raised a brow, then shrugged, her smirk never faltering. "Fine by me! This time, I know I'll win."

She didn't.

"Throne, damn it!" Kate groaned, slamming her cards on the table. "How in the frak are you doing this?"

Jack chuckled, feeling the heat rise in his chest, ”no idea. But I do know that your shirt belongs to me now."

Kate exhaled sharply, rolling her eyes. "Fine."

She stood up, gripping the hem of her tank top, and in one slow, deliberate motion, she began to lift it. Jack's breath caught in his throat as more of her skin was revealed—taut and toned from years of military training, a body sculpted for battle but still carrying a natural, effortless allure.

The fabric rose higher, revealing the curve of her waist and the smooth plane of her stomach. Jack's fingers dug into his thigh as he watched, captivated by the slow unveiling. Then, as the tank top reached her chest, he saw it—the slightest glimpse of what had been hidden beneath.

Her bra was the standard-issue kind, designed by the Ministorum for practicality, meant to compress and provide support for combat. Yet, despite its utilitarian nature, the way it hugged her curves only emphasised what lay beneath. The firm swell of her breasts pressed against the tight material, their fullness undeniable. They were perfectly shaped—large enough to fit in his palms yet not excessive, the kind that made a man ache to touch, to explore.

Jack swallowed, his throat dry.

Kate tugged the rest of the top off and tossed it onto the table. Her movements were casual as if stripping down in a hidden maintenance room with a squad mate meant nothing to her. Well to it shouldn’t, and Jack knew this, shared training, quarters and showers left her most of the time the same as she was now. But this time it was different. Maybe, it was the alcohol speaking to him or maybe it is the fact that they were alone, away from everyone else.

She sat back down, her exposed shoulders and collarbones glistening faintly under the dim lighting, her chest rising and falling in steady, unbothered breaths.

Jack, on the other hand, was not steady.

"Happy?" Kate smirked, leaning back slightly, seemingly unfazed by how his eyes struggled to focus on her face.

"Yes—I mean," Jack coughed, trying to regain control, "one more game?"

Kate chuckled, stretching her arms over her head, the movement making her breasts press more firmly against the tight confines of her bra. "Throne, yes. I will win this time."

Jack took another sip of Amasec, hoping it would cool the fire burning in his gut.

"What's next?" Kate asked, twirling a card between her fingers.

He hesitated, then smirked. "Your trousers and socks."

Kate blinked, then grinned wickedly. "Against?"

Jack considered, then offered, "My trousers."

Kate pouted, crossing her arms under her chest—a movement that only emphasised her curves. "Hey, that's one for two!"

Jack shrugged. "Fine, then name something else."

Kate bit her lip, clearly hazy from the alcohol, thinking. Finally, she let out a resigned sigh. "A trophy."

Jack narrowed his eyes playfully. "A trophy?"

Kate smirked. "If I win, you have to go back to the barracks and publicly admit I beat you in a card game."

Jack chuckled, shaking his head. "Fine. But if I win… I take your trousers and bra."

Kate's smirk faltered for just a moment before she rolled her eyes. "Frak you, Jack," she muttered. But she had backed herself into a corner—she had nothing else to bet.

"Deal?" Jack pressed.

Kate hesitated for a second longer before sighing. "Fine. But if you cheat, I swear I'll stab you."

The next game began, tension mounting with every turn of a card. The flickering light overhead cast shadows across the table, and the only sounds were the shuffle of cards and the faint sound of the ship's systems. Jack's heart pounded—not from nerves but from sheer anticipation.

Kate drew her hand, her brow furrowing as she calculated. Jack already knew that her fate was sealed—another perfect draw.

"Three… two… one!"

They both revealed their cards.

Kate stared. Then groaned, throwing her head back. "For frak's sake, Jack! You must be cheating!"

Jack only smirked. "Nope. You are just bad at this."

Kate huffed, grabbing her cup and downing the rest of her drink in frustration. "I thought this would be the game I'd finally beat you at…"

"Well, losers still need to pay up."

Kate exhaled sharply, standing up in defeat.

Jack watched as her fingers moved to the button of her fatigues. He shouldn't be staring. He knew he shouldn't. But the way she hesitated before slowly undoing the fastenings—dragging out the moment—sent a fresh wave of heat flooding through him and down between his legs.

She hooked her thumbs into the waistband and pulled, the fabric sliding over her hips, revealing inch by inch of smooth, toned skin. Then, lower, revealing the black underwear stretched over her form, hugging the curves of her ass, accentuating the sculpted shape of her thighs.

She stepped out of the discarded fabric, her movements slightly unsteady from the alcohol. They both laughed softly as she nearly lost her balance. Then, with far less hesitation than before, she reached for her bra.

Jack's breath hitched. His groin in flames.

She grasped the edges and pulled up—her breasts spilling free from the restrictive fabric, bouncing ever so slightly as they settled naturally against her chest.

Jack stared, his mind blank, his body betraying him as his trousers grew uncomfortably tight.

They were perfect. Round, perky, the kind of breasts that made men fall to their knees. Her nipples were a soft, delicate pink, stiffened slightly in the cool air. They could have been carved from marble, like the statues of saints found in the chapels of the Imperium, yet here they were—real, warm, breathtaking.

Kate tossed the bra onto the table and sat down, arms loosely crossed over her bare chest—not entirely covering herself, but enough to remind Jack that, despite everything, she was still in control.

"You sure you want to play another game?" Jack asked, his voice betraying his restraint, his body screaming for more, the alcohol only making it worse.

Kate smirked, swirling what little liquid remained in her cup.

"Depends," she murmured, meeting his gaze. "What's left to bet?"

"All or nothing?" Jack offered his voice low, deliberately tempting her. He knew exactly what was at stake, precisely what he was provoking—but he couldn't stop himself. The atmosphere was thick with tension, the heady mix of alcohol and anticipation making every glance, every touch, feel electric.

Kate leaned forward, her lips curling into a wicked smile. "Very well."

With greedy hands, she pulled two cards from the deck, her movements quick, almost reckless. Jack did the same, his pulse thrumming as they both threw their cards down onto the table, too caught up in the moment to consider strategy.

Kate's eyes widened. "FUCK YOU, JACK!" she yelled, but this time, her voice rang with triumph. She had won.

Jack blinked in disbelief as Kate shot up from her seat, celebrating her victory with an excited jump, her bare chest bouncing slightly with the movement. Her laugh was rich and teasing, pure exhilaration radiating from her flushed skin.

Then, with a slow, predatory grace, she stalked behind him, pressing herself against his back. He sucked in a sharp breath as he imagined her warm, bare skin pressing against him, the softness of her curves moulding against the rigid lines of his muscles. Her lips ghosted near his ear, her voice a husky purr.

"Guess it's my turn to see what you've been hiding, Jack."

His entire body tensed as she moved around him, straddling his lap in one fluid motion. His heart pounded at the contact, at the press of her thighs framing him. He felt her heat between her legs as his hardening member pressed against it. She shifted slightly, rolling her hips just enough to send fire licking through his veins, teasing, testing, savouring his reaction.

Jack clenched his fists against the urge to grip her, to pull her closer. His breathing had grown heavy, his pulse hammering against his ribs. "Kate—"

"Shhh. I won, you pay." She silenced him with a single finger against his lips, her other hand drifting down to the buttons of his uniform. One by one, she worked them open, her fingertips brushing against his heated skin. Every touch was deliberate, every movement slow and teasing, as if savouring each inch she uncovered.

Her breath hitched as she finally spread his jacket apart, her eyes darkening as she drank in the sight of him. For a fleeting second, there was something else in her expression—admiration, hunger, maybe even something deeper—but then it was gone, replaced by playful defiance.

She pressed herself against him again, her chest flush against his, her lips just a whisper away from his.

Jack exhaled sharply as she gripped his shirt, tugging it upward, her movements growing more frantic. The intoxicating scent of her skin, the way her breath came unevenly, the way her hips shifted against him—every part of him burned with need.

Then suddenly, with a strength that surprised her, Jack grabbed her by her rear, lifting her effortlessly. Kate gasped but didn't resist, wrapping her legs around his torso, her arms tightening around his neck. She was light—so light—and yet she felt impossibly solid in his grip, her body pressing into him in all the right ways.

His restraint was crumbling fast.

"Are you sure?" he asked, his voice low, rough. "This might be a one-off. We're drunk—"

Kate met his gaze, her expression unwavering, eyes blazing with raw want.

"Shut up, Jack," she whispered, breathless. "And fuck me."

With one hand holding her, he opened with the other his trousers. Revealing his pulsating and throbbing member. He then moved to her underwear and pulled it to the side while slowly lowering her down. When his tip touched her entrance, he felt her shudder in anticipation. He could feel how wet she was, her juices already running over his swollen head.

"Jack- don't- tease- me", Kate started, her voice rough and husk. Before she could finish her sentence, Jack slowly lowered her further down, his tip spreading her entrance slowly apart, penetrating deeper and deeper into her wetness. She gasped, clawing against his chest as his member slowly, inch by inch, went deeper. Jack enjoyed every moment during his long and slow insertion, feeling her flow and muscles contract.

Finally, with the last inch to go, Jack released her. He just dropped her down. His length piercing into her, leaving her with the sensation of being impaled, by something large, hot and stiff.

Both took a moment to breathe, hold each other tight, and feel the moment.

"Fuck you, Jack-" Kate finally whispered between quick breaths, and both chuckled.

Jack then started to move again, gliding out of her slowly, savouring each moment. When his tip was about to pop out of her, he lowered her once more, this time with speed and vigour. He lifted his pelvis once, he knew she was about to hit the base of his dick. Burying himself even deeper inside of her. Kate breathed out a heady groan, as Jack increased in speed. She tried her best to adapt to his movement and take in as much of him as possible. She felt him enter repeatedly, over and over; and Kate was convinced that each time he did, he was trying to go even deeper, beyond what was possible.

Finally, she couldn’t hold it anymore, and shifted slightly, trying to kiss Jack's throat or maybe even bite, but it was a mistake. He suddenly hit a part inside that made her jump. A jolt went through her, everything tensed, and a wave of intense pleasure rippled through her.

The sudden muscle spasm also made Jack waver as the sudden tightness drove him over the edge. He nearly tipped over and had to sit down on the table as his member quivered and twitched inside of her velvety warmth.

Kate was out of breath, each twitch from Jack made her wince in pleasure, yet she was too exhausted to properly indulge in the feeling.

"Jack- This was intense." Kate managed to voice, leaning heavily against the muscular frame of her lover.

"Well, I don't know about you, but I am not done yet—" Jack informed her, and she suddenly realised he was right. His not-so-little friend was still stiff inside her.

"Uhm- Jack?" Kate tried to voice her concern, but he didn't listen or didn't want to. "Jack!" she tried again, but the guardsman had other plans.

He got back to his feet, holding her firmly with both arms slung around her waist and started to walk. Each step he took rammed his dick inside of her. She felt so sensitive, her senses dialled up to a hundred after she had already come once. She bit her lower lips as she felt a new wave of pleasure slowly crawling up on her.

Kate turned her head to the left, to see where Jack was taking her and through the haze of pleasure and drunkenness realised that his goal was a stack of crates. They were stacked just at the right hight for whatever Jack was planning next. Suddenly, Kate felt Jack withdraw from her, but before she could voice any protest, she was lying over the boxes, her breasts dangling over the edge, her rear in the air. It didn't take long until he went all in.

Kate felt the heat emanating from him and completely enveloping her as he fucked her roughly and without pause. After a while, Jack found that one spot again, that made her see the God Emperor himself and Kate, unable to hold back any longer, rewarded his efforts with a high-pitched moan.

Jack grinned devilishly and made sure that each of his powerful thrusts made Kate squirm in pleasure, rendering her a complete mess; in the end, when he was sure that she has reached her peak, he allowed himself to let go as well and came deep inside of her.

After a few minutes, during which neither of them moved, and they simply savoured the moment, his breathing calmed down and he finally regained consciousness. When he was sure, he could move and not fall over. He finally pulled out of Kate, his limp member, plopping out of her with an audible pop.

Kate didn't move, unable to compose herself, wavering between consciousness and unconsciousness. As a result, she barely noticed Jack withdrawing.

"You ok?" Jack asked as he leaned over her. He didn't know why, but at that moment he followed a sudden impulse and pushed two of his fingers inside of her- stuffing the slick that was lazily dripping out of her abused hole back in.

Kate's response was a faint, unintelligible moan that could have been either complaint or arousal.

***

It took half an hour for Kate to return to her senses, only to find herself confused and lost but, most importantly, empty.

She lifted her head, looked around, and realised that one, she was still drunk, two, was in her bunk bed, and three, dressed in her uniform. Yet, there was no Jack around, only Daren, Giddeon and Celina. She dropped back unto the pillow and closed her eyes. She felt exhausted, and then there was this stickiness between her legs slowly leaving from within her, and she had to smile.

"Feeling better?" Celina chimed into Kate's daydream.

"Yea-" Kate answered hesitantly, unsure of how much she or the others were aware of.

"Good; we were all worried when Jack brought you back and told us you fell over from exhaustion." Celina clarified, and Kate nearly let out a sigh of relief. "But you are clearly drunk. You need to stay away from him. He will only get you in trouble. Frack- even his illegal trafficking of Amasec nearly got us into hot waters." Celina shook her head in disgust. "Frack him- If he wasn’t our sergeant-"

"Yeah," Kate smiled, leaning deeper into her pillow and closing her eyes. "Frack him-"

#warhammer 40k #smut #imperial guards #OC x OC #warhammer fanfiction #not my writing #warhammer smut

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