A/N: Honestly, U-96's design has charmed me, but that workout skin of hers is just that little bit extra spicy~

As such, might be more fics in future featuring that skin, heh. Next chapter for this fic though will feature Grozny, as she can be seen in the background of U-96's skin; got the chapter about halfway finished, though not sure when I'll upload it.

That aside, do enjoy~

Stretching

Chapter 1: U-96's Workout

Ship-Girls were strong. Both physically, and mentally.

The former was the most apparent aspect of their strength. They could easily carry their riggings on their backs without it impacting their movements, they could swing swords with enough force to cleave through Siren steel, they could pick up and carry their fellows with one hand – as such, it was often thought they didn't need to work out. And in truth they didn't; their strength, while it could improve, would do so so subtly that any difference was miniscule at best. The difference between lifting a 500-ton ship and a 520-ton ship was rather small, in the grand scheme of things.

Still, Ship-Girls did work out. Sometimes to try and refine their strength that little bit more, others just for the therapeutic nature of it, akin to organising books or tidying up a room to perfection. Thus it wasn't uncommon to see a Ship-Girl or two venture from the base to some quiet, out of the way gym to work out for an afternoon.

One out of the way gym found itself host to several such Ship-Girls at that very moment.

''Mn... mn... guh...''

''That's it, keep going. Almost at five hundred. Don't stop now.''

Laid down on her back U-96 grunted in acknowledgement as she lifted the barbell above her head once more, her slim arms quivering as she hauled it up before pulling it back down, resisting her body's instinctive want to just drop it and give up. The petite Submarine persevered despite the strain – a strain built up over several hours of lifting weights, testing the limits of her endurance under pressure. Still, even if her strength was greater than any human's, that didn't stop the fact her stamina had a limit, and she was rapidly nearing it.

Stood behind her was a young man in his mid-twenties, serving as her spotter – uttering encouragements whenever she seemed to be tiring, propelling her on. Clad in a white tank-top and some cargo pants his muscles were laid bare for anyone to see; the muscle of his arms bulged from working out and a peek at his torso revealed firm muscle. He was far from a bodybuilder, still somewhat slim, but with enough work he'd put on some proper muscle yet.

''Almost there, keep going.'' He firmly remarked, watching her arms quake as she lifted the bar again. ''And... done!''

U-96 puffed out the breath she'd been holding; the barbell caught by the young man himself before he lifted it and set it up on the rack. ''That was... really five hundred, right?''

''Yep.'' Walking around the apparatus he came to a stop in front of her, offering her a hand. ''You did good.''

U-96 shot him a smirk of thanks, letting him pull her up into a sitting position; panting as she caught her breath. The moment he handed her a bottle of water she chugged half of it and the towel he handed over wiped away the sweat across her forehead before being draped over the back of her neck.

Busy catching her breath U-96 was oblivious to the way the young man's gaze roamed over her. Though they'd worked together for a good few weeks now he'd be lying if he said U-96 wasn't an attractive girl. She was petite but fit, her stomach flat and defined alongside her slender arms. A white sports bra hugged her small bust snugly and her pale platinum hair was tied up into twin-tails on either side of her head. Arguably the most alluring part though was the black yoga pants she wore, hugging her narrow hips and slim legs.

Watching her do squats was particularly arousing, no matter how much he fought to keep his blood from rushing south.

''Heh. See something you like?'' U-96's amused voice snapped him out of his staring.

The young man chuckled lightly, rubbing his neck. ''Sorry, was lost in thought.''

''And I wonder who was on your mind.'' U-96 mirthfully countered.

''I ain't denying it.'' He simply said, glancing around. The quaint gym wasn't that busy, but there were a couple other Ship-Girls currently working out on the other machines. ''Though...''

''Oh?'' U-96 raised a brow curiously, leaning in. ''Got an idea?''

He swept his eyes over her again. He wouldn't deny he was attracted to her, but was curious if she felt the same. ''We could do some other exercises in the changing rooms, if you're up for it.''

U-96's brows disappeared up into her hairline, and for a moment he thought she was going to call him a pervert or something, but to his pleasant surprise U-96 hummed and considered it.

And after a moment, shrugged. ''Sure. Lead the way.''

The utter casualness of it her remark was infectious, and with a smile the young man offered her a hand – lifting the petite, lightweight girl to her feet before leading her across the main room towards the changing rooms, identified by the two grey doors near the corner. The young man casually opened the male changing room door and led U-96 inside, the two of them meandering down the L-shaped corridor until they reached the room itself.

It wasn't anything fancy, not surprising considering the smallness of the gym, but it was cosy. A small square room with lockers on both sides, a bench in the middle, and a set of showers at the far wall. However the young man's gaze was quick to focus on U-96, turning around to face his gym-partner and admiring her in a new light. He would admit to feeling a spark of nervousness, but smothered it immediately.

Worst came scenario, she walked out on him. Best case scenario, he got laid. Hardly a tough decision.

''So...'' The young man trailed off.

U-96 smirked, one hand on her hip while her other reached up, beckoning him down to her height. The young man obliged, leaning down – and the moment he was close enough her right hand darted out and grasped his hair, pulling him the rest of the way and mashing their mouths together. The kiss was rough, heated even, but after a second both of them calmed down and started kissing more normally; a lilted groan escaping U-96 as she closed her eyes.

Boldly the young man reached down and grabbed her ass, and when she didn't smack his pawing hands away he lifted her up a little. Without missing a beat she looped her legs around his waist and snaked her arms down his back, smirking as she deepened the kiss. She felt so light in his hands that he could hold her with just one hand, his other sliding up her stomach and admiring the muscles beneath the skin; firm yet smooth.

His hand though slid further up, his fingertips passing her ribs and poking under her bra – before finally he got it up. As expected her breasts were small, allowing him to cup her left easily, but that did little to dim his lust. A fact he proved as he moved his hand out of the way and broke off the kiss before darting down, taking her left tit into his mouth and sucking on the perky pink nub tipping it; coaxing a throaty groan out of U-96.

''Myn...'' U-96 shivered at the lewd suck, lust in her golden eyes. ''What happened to doing some exercises?''

The young man cracked a smile at that, earning a low chuckle from U-96 herself – one that melted into a moan as he sucked on her tit once more. He loosened his hold on her a moment later, his hands sliding up her butt and over her lower back until she was stood on her own two feet once more; standing just a head shorter than he himself. U-96 didn't seem to mind the height difference though and just flashed him a smirk – before dropping to her knees.

Just seeing the Ship-Girl in such a position in front of him was arousing, but watching her grab his cargo pants and pull both it and his boxers down, revealing his hardening cock, was much more so. U-96 cooed as she laid eyes on his shaft, curling her lithe fingers around it and gripping it firmly – slowly starting to pump his length and coaxing a moan up out of his throat, the sound echoing off the walls. He winced and tried to keep quiet lest they be overheard.

A task made much harder when U-96 kissed the tip. He gasped, intimately feeling her perfectly-shaped lips press against the very tip before they moved down lower, touching just under the head. More kisses carried her down the underside of his dick until she reached the base, nipping lightly at it and making him groan. A hot tongue pressed itself flush against his meat and she licked straight back up to the tip a moment later, flicking the head a couple times with her tongue or even carrying it about with the wet appendage, teasing him.

''Fuck...'' He murmured, aroused.

U-96 just smirked, grabbing his dick once more and licking the tip more insistently. She was good at it too; slithering her wet tongue over the slit a couple times before swirling it around the head, smearing her spit into his throbbing tip. She worked a little lower, swirling her tongue around the crown of his shaft before licking the underside, her warm breath washing over his length – before without warning she took him into her mouth.

''Guh...!'' The young man struggled to hold back his tight, pleasure-filled moan.

Mirth shined in U-96's golden eyes and she hummed, slowly sinking deeper down his length. Her pink lips grazed over the head and inched down his shaft, enveloping more of his pulsing meat inch by inch until she reached the halfway point – before swiftly she sucked back up to the very tip. She didn't stay there for long before plunging halfway down again; settling into a rhythm then and bobbing her head, her hand attending to the other half of his cock.

At the same time her tongue seductively slithered around the tip, continually stimulating it as she gave him a blow-job. She tilted her head a little as she sucked, letting her tongue tickle new parts of his cock or even causing the tip to press against her cheeks; the flesh wet and slippery. Her teeth were held out of the way but he felt every exhaled breath that washed over his cock, the ticklish heat made all the more erotic when her sucks turned into slurps.

''Ohh fuck... you're give good head.'' The young man murmured, brushing her hair aside and keeping it out of her eyes. ''You don't mind doing this?''

Her lips slurped off the tip, her hand instead pumping him from base to tip. ''I'm fine with it. Just try to keep up~''

The flirtatious coo sent a lustful shiver through him, and with a murmured agreement he put his hand on the back of her head and coaxed her back down his cock, moaning as he felt her tongue caress the underside. Warmth throbbed up his length then, the pleasure growing infinitely more intense with every wet-sounding slurp, her lips reaching deeper and deeper until she let go entirely and finally deep-throated him.

She didn't stay still, but just feeling the tip of his cock hit the back of her throat before she slurped up to the very tip felt downright heavenly, a moan rolling off of his tongue. There was nothing to hold onto but U-96 so he grabbed her head with both hands, uttering a string of curses as he pulled her back-and-forth, pushing her nose-deep into his crotch and feeling her tongue press itself flush against the underside of his shaft. The sensation accelerated his end, his knees bending as heat rushed up his cock, pressure building – until he burst.

''O-Oh shi- it...!''

The words caught in his throat, withering into a hiss of pure, unbridled pleasure as he busted his load in U-96's mouth at last. On instinct alone he shoved her down, sheathed fully within her mouth and spasming as he felt her suck him a few more times – slow, muted gulps carrying his seed down into her belly. The thought only fuelled his arousal, the lust within him consuming all thoughts.

Moments passed before he regained some semblance of sanity, and with a grunt he loosened his hold and stumbled a half-step back. His dick slid out of her mouth a moment later and U-96 coughed into her arm, wiping away the spit on her chin and waving off his concerns before he could even utter them. Clearly this wasn't her first time blowing a guy.

''Mm, so how you wanna do this?'' U-96 soon questioned as she wobbled back to her feet, gazing up into his eyes. ''I'm up for anything really.''

The young man hummed, running his eyes over her. With her face flushed pink and her sports bra pushed up over her small breasts she looked down right inviting – doubly so when U-96 smirked and pulled her yoga pants out, revealing the white panties she was wearing underneath, clinging to her damp sex. In response he laid a hand upon her stomach and slipped it down, not breaking eye-contact even as his hand went into her underwear, touching smooth pussy lips. A probing finger told him how wet she was.

'Huh. So she's really into this.' He was pleasantly surprised by that.

Pushing the thought from his mind he hummed, filling the quiet even as he casually pumping his middle finger into her – relishing how U-96 shifted and squirmed, doing her best to look casual as he fingered her. ''Hm... bent over by the lockers?''

''Sounds good to me.'' U-96 remarked, shivering as he pulled his hand out.

The moment his limb was out of the way U-96 turned her back to him, a slight smirk visible as she grabbed the waistband of her yoga pants and then sensually peeled them down, the white band sliding down her small but shapely butt. Her panties came down with her pants, revealing her smooth lips as she bent forwards; leaving her pants and stained panties around her thighs, exposing just enough for him to put it in but not so much it'd be troublesome to pull them back up if someone entered the room. He could appreciate that fact, stumbling behind her with his own pants and boxers around his ankles, one hand on his cock and rubbing the swollen tip along her folds, making them part but not penetrating her quite yet.

U-96 groaned, reaching back with one hand and grabbing her own ass, pulling it and revealing her pussy more. ''C'mon already~''

The groan bordered on a whine, exhilarating the young man – and with little hesitation he pressed the thick tip against her entrance and pushed inside. Searing tightness clamped down on him in an instant, her pussy narrow yet utterly melting his mind as he pushed inside; a throaty groan escaping him despite his best attempts to keep quiet. U-96 had the foresight to cover her mouth; muffling her own moan as she felt him spread her tight insides apart.

Inch after inch sunk into her until two-thirds of his sizeable cock was inside her. Only then did the young man pause, grab her waist, and then slowly pull out. Her walls clung to him as if begging for him not to do so but he continued, waiting until only the tip was left between her folds before driving himself back in – fucking a slow hiss out of the Ship-Girl. She pushed herself back towards him, the tip prying her insides apart until at last he was balls-deep in her snug pussy, his pelvis flush against her small behind.

''Fuck.'' He swore, shifting a hand down just to grope her ass. ''You're so tight.''

U-96 just puffed out a breathless sort of snicker, her hands shifting across the metal lockers before pushing herself back towards him once more. He pushed back, finding a rhythm that saw his cock sliding in-and-out of her clenching tunnel, unheeding of how tightly her inner walls constricted his length. He bottomed out inside her several times but not always; their movements sometimes causing only half of his dick to spear between her warm walls whilst other times he suddenly jammed himself all the way in, his pelvis clapping her ass and sending a spasm jerking up her toned back.

Aroused by the sight the young man put both of his hands on her slim shoulders, gripping them and picking up speed. Sharp, gasping moans answered him, her walls closing around his cock as he hilted inside her rapid-fire style, barely an inch or two of his cock sliding out before he promptly jammed it back into her tight tunnel. Arousal helped glide his cock between her walls and he gladly railed U-96 for all she was worth, getting off on her moans just as much as he was her pussy.

''Myn! Schwerer!'' U-96 cursed in her native tongue, shoving her hips back as much as the position would allow – gasping as he pounded her cervix, unheeding of how snugly her pussy smothered his length.

The young man groaned under his breath, slipping one hand from her shoulder down to her bust, groping at her breasts. She moaned, the sound becoming higher-pitched when he pinched her nipple and gave it a firm tug, the rush of sensation accentuated by a particularly hard thrust up against her cervix like he was trying to breach it. U-96 shuddered powerfully at the mere though, mouth hanging open and clinging onto the lockers now just so she could remain standing; whatever stamina she had waning in the face of such overwhelming pleasure.

Neither said anything even as the young man hurried his thrusts, the sound of clapping flesh rising in volume and reaching a new tempo entirely – one with little rhythm beyond jamming his cock into her snug hole as hard and roughly as he could, getting off on the addictive friction. His shaft throbbed at the feeling, her juices clinging to his shaft and pre-cum gleaming across the tip of his dick, the pressure within his shaft rapidly building-

''Fuck!'' His hips momentarily gave out, jamming him in her tight, squeezing pussy – and he blew his load. ''O-Ohh fuck...''

U-96 shoved a fist into her mouth, moaning shakily into it as she felt his heat spill into her – ropes of cum splattering his seed across her walls or pumping it directly into her womb, the feeling making her toes curl. In that moment neither of them cared about protection or any consequences, so lost in their lust they were. She kept squeezing him throughout their mutual orgasms; every slight clench of muscle making her wring out another spurt of cum, much of it already leaking out around his cock and down either his shaft or her inner-thighs.

Until with a groan the young man pulled out. Thick droplets of cum spilled out of U-96's ploughed pussy immediately afterwards, hitting the floor between her quaking legs with a wet-sounding splat. The young man relished the lewd sight, panting for breath and leaning up against the lockers next to U-96, just catching his breath. The Submarine on the other hand opted to sit down before her legs gave out under her, also breathing quite heavily.

''That was...'' U-96 spoke up, cracking a grin. ''Definitely worth the work-out.''

The young man chuckled lightly. ''Agreed.''

U-96 hummed at that, eyeing him for a second... before peeking back at the showers behind her. He suspected he knew well what she was thinking and proposed an idea.

''Wanna shower together?'' He said, blushing lightly when she looked at him. ''I mean, we're sweaty and all.''

Both knew that was just an excuse but U-96 was all too happy to use it as one, humming her agreement. Rising to her feet she shamelessly shoved her yoga pants and panties down to her ankles before stepping out of them, her bra coming off too and leaving her stood completely naked before him; shoes taken off with her pants. In their absence he could appreciate her slender form much more acutely, idly taking his own clothes off as he followed her into the showers.

The showers in question weren't anything special, literally just a cube-shaped space with a total of six shower heads spread out across three walls – two apiece and with light-blue tiles on all sides, albeit said tiles had faded to white somewhat. The young man didn't let that bother him and tossed his shirt off and threw it behind him, not caring where it landed and instead just getting behind U-96 as the Ship-Girl turned the knob and doused them both with pouring water – the nippy chill rapidly warming to something much more pleasant.

At first, both started to wash. A bottle of shower cream hung from the knob, still holding suds from the last person who used it, but U-96 had no qualms about squirting some of the cream-coloured stuff into her palm and starting to rub it into herself – doing the essentials and not really dallying much, prompting the young man to do the same.

Of course, after a minute of showering, lust was quick to make them look at one another.

Standing taller than her and just behind her he got the perfect view of her as she looked over her shoulder at him, her waist twisted slightly his way. Soapy suds ran down her lower back, carried by streams of opaque water and running down her small but perky ass, whilst other streams of water curved down her front and off one arm, dribbling off her fingertips. That stopped as she raised her arm and turned towards him, her cheeks red as he grabbed her butt and picked her up with ease.

Her legs rubbed against his side before soon wrapping around him, both arms also looping around his neck too – bringing them nose-to-nose. Mirth gleamed in U-96's eyes and she tilted her head slightly to the side, her lips parting as she drew in close, and without a word said they connected their lips in a slow, lustful kiss. At the same time he moved one hand to his cock and rubbed the bulbous head along her slit, teasing a moan out of U-96 – and escalated that moan into something throatier as he lowered her down onto his cock at last.

''Mmn~'' Pulling back from the kiss first U-96 shuddered, a lustful look in her eyes. ''Fuck me.''

It was more an order than a request but one that the young man complied with all the same, lifting her halfway up his cock before easing her back down again, starting off slow. Sliding into her was easier than before thanks to the cum inside her, his previous load acting like a crude lubricant that guided his cock between her smothering walls and bumping the tip against her innermost parts. U-96 moaned approvingly in response, their lips swiftly reconnecting in another kiss even as he bounced her onto his cock.

Lust was quick to infuse his muscles and hasten his movements, a growl bubbling up his throat as he moved faster, harder, rougher. U-96 clutched onto him, gasping against his lips as he grabbed her hips and yanked her down onto his cock, impaling her upon it before swiftly raising her back up again – giving her no chance to catch her breath before he promptly plunged her back down his shaft. Her fingers weaved into his hair and clung onto his back, pulling him in and sealing their lips together in another rough kiss.

''Ja... don't stop.'' U-96 tickled his lips with the breathy words, stealing another quick kiss before tipping her head back, moaning.

The young man let her tip back even further; shifting his hands up to her waist and letting her lay back until she was nearly horizontal, his cock still throbbing within her tight pussy. He reminded her of that fact as he resumed thrusting with a vengeance, pumping her tunnel and fucking a throaty moan out of the Ship-Girl, her legs wrapping even tighter around him as if trying to yank his dick into her sooner.

The water sprayed over his back but he paid it no mind, his focus entirely on the pussy smothering his cock and the vixen shooting him a sultry smirk. With remarkable flexibility U-96 bent a little further before throwing her weight up and snaking her arms around his neck once more, her lips crashing against his own so roughly they nearly banged teeth, but in that moment neither of them cared – too busy making out to think of anything but the pleasure coursing through their joined parts.

''Mmph! Ja!'' Gripping his hair U-96 pulled him into the kiss after breaking off from the last mere moments beforehand. ''Hard- hah!''

The young man swore as he felt her inner walls clamp down on his cock, the snug vice squeezing heat straight up his cock, making it all the more impossible to resist the flare of pleasure that shot up it, his hips slamming forth and burying him into U-96's snug pussy – until the heat of her womanhood proved too much for him to handle and he yanked her down his cock, moaning explosively as he blew his load inside the Ship-Girl.

U-96 jerked; stomach taut and back arching as she felt ropes of warmth splatter inside her – the sensation pushing her to her own climax. The way her walls tightened around his length only further purged his mind of all thought; white-hot bliss rolling up his cock as he emptied his balls inside the petite girl, so much filling her that thick amounts dribbled down his cock and dripped out of her stuffed pussy.

''Mn... guh...'' Rocking his hips lightly the young man stirred his cock around her vice, before with a hiss he slowly pulled out – the tip springing out with an audible pop and causing a deluge of sticky cum to spill out of her. ''You alright?''

''Heck yeah.'' U-96 answered with a breathless sort of chuckle, flashing him a grin. ''Wouldn't mind exercising like this again next week~''

The subtle offer sent shivers of arousal through him. ''Sounds like a deal.''

''Bet it does. Now put me down. Hope you don't mind sharing your towel~''

The young man chuckled and obliged; the two of them chatting even as they got out of the showers and he dried her off, not-so-subtly flirting throughout.

And as promised, they would meet again next week... though with an unintended guest too.

[END]

A/N: I also heard somewhere that a Ship-Girl's superhuman strength only happens when wearing their rigging, and in response to that I say; not in my head-canon~