The stars whirled slowly outside the viewport, where a forearm-thick slab of glass separated the
module from the emptiness of space. It was a bit lonely out here on one of the outstretched arms of the
rotating space station, where gravity was at its strongest, but it was the only place where there was
enough oomph to get in a proper workout. Microgravity and low-gravity simply couldn't compare.
The module was intended for crew members to exercise, but it was mostly equipped for light
cardio, like treadmills and very light weights. That was alright for the needs of most of the crew, who
just needed someplace to keep their bones from losing strength after weeks in microgravity. However,
some people had figures to maintain, even in space. Without enough heavy weight gaining, muscle
definition and size stayed planet-side. But a few aftermarket holo-projectors – the nice kinds with the
tactile force feedback and simulated weight systems for “full immersion” – installed around the module
solved that problem.
Standing in the middle of the gym module's open space, with the exercise bikes on one side and
full-length mirrors on the other, Pink watched herself slowly raise and lower a pair of luminous blue
weights in her paws. The hard-light constructs looked like the shimmering outlines of metal weights,
but they were definitely just as heavy. Breathing in and out in rhythm with her reps, the gray-furred rat
hybrid was transfixed on her own ruby-red eyes. She inhaled deep as she raised her arms out
perpendicular to her body, her arms tensing under the hefty weights in her paws. Furry breasts bulged
out, above and below, her sports bra as she held her breath. Beneath them, the rat's abs tensed and
tightened as she began to slowly lower the weights back down. She had wide hips and full thighs to
balance her large bust, and slight definition of strong quads showed through her fur.
Pink finished her reps for that exercise, panting softly. Her shoulders and arms had that familiar,
welcome burn. She let go of one weight, and it dissolved into a cloud of voxels. Turning sideways, the
rat massaged her neck and admired her figure in the mirror.
She was buff. Nicely buff, enough for her definition and bulk to really show through her fur, but
no one would call her a bodybuilder. Walking closer to the mirror, she flexed her bicep. The muscle
peaked lightly from her arm, but it wasn't much of anything to show off. Pink sighed and ran her paw
through her silver-gray hair, sweeping it all to one side and behind her sharp, pointed ear. She wasn't
huge.
Despite having the holo-projectors as a makeshift weight set, she'd really seen no progress on
her physique these last couple months. She worked out for its own sake, sure, but she really wanted to
gain and pile inches onto her arms, thighs, and chest. The rat wanted to steal people's breath away when
she shouldered into a room, like a hulking mountain of muscle. But out here, stationed on this space
borne can, that wasn't going to happen. At best, she was managing to maintain her size. Gains, though,
that was out of the question, unless she really cranked it up.
That was an idea... Pink took two steps back from the mirror, snapping her long, slender tail
against the plasti-paneled floor beneath her feet. Holding out one paw, she conjured a barbell from thin
air. The holo-projectors wedged into the ceiling flickered on and shimmered, spewing a steam of blue
light voxels that formed into the shape of a barbell for her. It was weightless at first. At least until she
gave it instructions. Holding the whole thing in one paw, she held a finger out beside it so the
holographic control panel would appear. There was a nice slider on it that read “Weight.” Normally
Pink set it to two notches. This time, she pushed it up to six.
The barbell suddenly became extremely heavy in her paw and tipped sideways. Squeaking, the
rat grasped it in both paws and strained to lift it back upright, her arms bulging from the effort. Light
could get really heavy. Gritting her teeth, she began to lift the barbell up towards her chin, feeling her
whole body shudder under the strain. Back planet-side, this was the most weight she could handle...
and it was beating her. Too much time in low gravity was winning. She couldn't get the bar all the way
up to her muzzle, but she was too stubborn to give in. Eventually, she ran out of stamina and pitched
forward. She let go of the bar to catch herself, landing on her paws and knees on the floor. The barbell
exploded into a million voxels all around her and slowly disappeared.
Pink just lay on the floor for a bit, sighing.
A few minutes later, there was a click from the module door. The hatch hissed with equalizing
pressure and then the lock spun and the door split open. In came a hovering delivery drone, carrying a
package suspended in the shimmering cone of its tractor beam. The drone took a moment and scanned
the room with a sensor, detecting Pink laying in the middle of the floor. It floated over and chimed
pleasantly.
“A package arrived for you, ma'am,” the drone explained. Their voices were cheery and polite,
but always a little stilted and digital, making them a bit uncanny to hear.
Pink blinked her eyes. She wasn't expecting a package. Hopping up to her feet, she turned and
eyed the box in the tractor beam. Pretty normal; just regular brown packaging. Even in space, some
things didn't change. Reaching out, she took it in both paws, and the drone's tractor beam disengaged.
Pink looked around for someplace to set it while she opened it, but there was just space-saving
treadmills and bikes. There wasn't anywhere she could set
She called for a table made of hard-light. A featureless green table with four legs materialized
out of voxels in front of her, and she set the package on top of it before shredding into it with her claws.
There was a featureless white box inside, and a note attached to the top of it. Pink peeled it off and
started to read it.
“Hey, Pink,” she said aloud, playing with the end of her hair over one shoulder. “Heard you
were having a bit of trouble keeping ripped up there. Would hate to see you slim down, so I packaged
some treats that'll fix that for you. I know you'll like them.”
The note wasn't signed, nor was there a return address anywhere on the box or the package.
Pink wriggled her nose and opened the box up. Nestled inside some puffy air packets was a brace of
protein bars. Her red eyes lit up immediately. She hadn't been able to get anything like this in months. It
wasn't a brand she recognized, but that was alright. There was a symbol of a little potion bottle with a
fox tail on the packaging.
Pulling one of the bars out of the box, Pink realized the drone was still hovering at her side.
“You alright?” she asked it, raising one eyebrow.
“Awaiting further instructions,” the drone replied, bobbing up and down in mid-air. The tiny
camera aperture on the front of its spherical body whirred softly.
The rat shrugged. “Well, you can hang out and watch if you want.”
“Processing... command not understood.”
“Cool.” It wasn't her job to worry too much about the drones.
Pink pulled the end off of the protein bar and sniffed it. The chocolate flavor was rich. She bit
the end and slid it out of the wrapper before munching down on the whole thing. She was mid-workout,
so why not. This would help her put on a little more muscle and start building her body back up to what
she remembered and more.
“Catch,” she mumbled around the treat, tossing the crumpled wrapper to the drone. The
levitating machine shot out its tractor beam and snagged the wrapper before it hit the floor. It looked
somehow pleased with itself.
Pink gulped down the bar and turned her attention back to her reflection. After her distraction,
she needed to warm back up. Knitting her fingers together, she stretched, arching her back, and felt her
arms pressing against her cheeks. Her tummy gurgled lightly and she licked her muzzle as she
continued holding the stretch, feeling her arms squash her face. The rat's muscles twitched lightly, from
her neck down to her toes. She opened her eyes, feeling a little dizzy, so she lowered her arms to steady
herself.
There may have been something odd in that protein bar. Pink put one of her paws on top of her
chest, feeling her heart beat rapidly. She was getting warm, and her muscles were tensing. Her veins
felt like they were struggling under the pressure. Pink held out her other arm and looked at it. Sure
enough, the veins over her bicep were showing through her fur, pumping blood to her twitching
muscles. Instinctively, she flexed, and her bicep swelled. Pink's jaw dropped and her eyes sparkled as
her bicep ballooned so big... and kept growing. With every beat of her heart, her arm surged bigger,
thicker, and stronger. Powerful, rippling meat expanded underneath her fur and skin.
Her black sports bra and workout shorts tightened around her body, quickly digging into her
gray fur. Pink turned her attention back to her reflection. What was happening to her arm was just a
taste. Her entire body was inflating with muscle, rapidly bulking and ballooning bigger and bigger. She
couldn't even formulate a word to express what she was feeling. Each heartbeat made her entire body
swell, packing on dozens of pounds of muscle. Her skin was putting tight around her new figure as she
transformed from buff and slender to far bigger than her wildest dreams. Pink wanted to be huge, and
her idea of huge was being re-defined right in front of her eyes.
The curviness of her hips evaporated, replaced by raw, solid muscle. Barely-visible abs turned
into fist-sized cobblestones up and down her torso. Her quads doubled in size, with veins coursing
through them, as her biceps and triceps ballooned to equal watermelons. Pink tried to look down, but
her pecs swelled up behind her full breasts like emergency rafts. Her chest pushed back against her
oversized arms, with fur rubbing against fur, and her pecs lifted her chin up on top of their bulk. The
rat's sports bra was stretching to its limit. Her big bust usually gave the poor thing a hard time, but now
it struggled to contain her hulking torso.
Slowly, her growth slowed. Pink felt a mixture of relief and disappointment as she stopped
getting bigger. Her heart was still racing behind her slabs of meat, but whatever substance had tripled
her in size, it had run its course. The rat panted as she looked herself over in the mirror. She wasn't a
bodybuilder. She was a beast. Balling her paws into fists, she flexed her biceps, making her skin strain
around their unbelievable size. They towered above her head, all muscle and veins under gray fur. How
strong was she now? She had to know.
Pink again conjured a barbell into her waiting paw. It felt light as a feather, but she hadn't
increased its weight yet. It was a bit of a struggle to get her other paw over to it to handle the control
panel, now that she was so musclebound. She let out a self-satisfied squeak at the feeling of her
muscles being so big and bloated they massaged and flexed against each other. This was new to her,
and very, very exciting. Finally, she managed to up the weight to the sixth notch once again... and the
weight still felt light. She gave it two more taps, and finally the barbell started to feel like a modest
challenge.
Gripping it in both paws, Pink pumped the bar up to her chest, squishing the hard-light
construct into her breasts. Her biceps swelled as they flexed, and they squeezed her swollen pecs
together. Her chest muscles pressed against the rat's face, and she whipped her tail against the plasti
panels in pure, unadulterated joy. This was perfect.
But there were more bars. As the thought crossed her mind, Pink licked her nose. More? Could
this just be the start? Something told her she was pushing her luck, but she was already reaching her
paw into the box. Her swollen, hulking forearm stretched the top of the box out as she grabbed the rest
of the protein bars. She'd eat just one more first, just in case it didn't work. She could save the other two
to get bigger later.
Pink tossed the wrapper and shoved the protein bar into her mouth, munching it up and
swallowing. Again, she felt the inner fire, her heart racing and beating, delivering that promise of even
more massive size to her waiting muscles. And she wasn't disappointed. The gray-furred rat hybrid in
the mirror flexed and began to bloat even bigger. Her muscles were unstoppable, doubling over in size
and strength and power. Pink let out a long, heavy moan as she grew to an unbelievable, impossible
size. Her lats were so huge and wide that she couldn't even lower her arms down. Not that she wanted
to! She flexed them hard, feeling her forearms, biceps, and shoulders all bulking and pulsing against
each other, stretching her arms outwards as every muscle jockeyed for its own space in the increasingly
crowded orbit of Pink's body. She was so huge, she took up space for three people.
It took a moment for her to become aware of the buzzing in her ear and the flashing red light
above her. A warning image popped up on the mirror:
Attention! Module weight limit exceeded. Superstructure unstable.
The plasti-paneling was starting to buckle underneath Pink's feet. All this muscle was heavy, but
she barely noticed. Hovering nearby, the delivery drone was beginning to bounce up and down. Red
lights flickered around its form as it switched into emergency mode.
“Ma'am, evacuation is recommended,” it buzzed, but Pink ignored it. She wasn't going to stop
now!
Grasping the two last bars in her paw, Pink tore off the wrappers and raised them up to her
mouth. But her paws couldn't reach her head, which was completely smothered between her pecs and
hulking traps. Her arms, her breasts, her chest... she was too big. All of her muscles simply squashed
against one another. Unbelievably exciting, yes, but not helpful for getting even bigger. Thinking
quickly, and ignoring the warning klaxon going off in the module, Pink created a little holographic
plate to put the bars on, and brought that to her mouth, tipping it over so the muscle-enhancing snacks
fell into her waiting jaws.
She munched them up, ready for that surge of power and size and growth. How big was she
going to get? The module was already beginning to feel cramped with how much space she was taking
up. Her body began to bulk again, gaining more muscle and more mass. She was so wide now, and
getting even wider! The rat was as thick as she was tall, judging by her reflection. Her pecs ballooned
underneath her chin, pushing her jaw upwards and the back of her head into her traps. Moaning, Pink
raised her extremely heavy arms up and tried to flex. She was so massive. Her muscles could barely
move now, squashed against her face as she tried to strike a pose for herself, admiring her titanic body.
Her sports bra finally snapped under the pressure, letting her chest loose. Instinctively, she tried to
cover her breasts with her paws, but her biceps and pecs wouldn't agree. They pressed against one
another, bulk pushing back against bulk and preventing her from bending her arms inwards. It was such
a feeling, to not be able to do something. She was too big, and she loved it too much.
Just as she was enjoying her musclebound frame, the wall mirror cracked along its length.
Pink's ears perked up. The warning sirens were even louder now. Slowly, she lumbered her incredibly
massive and heavy frame about as another voice droned above the noise.
Module weight limit exceeded. Structure integrity failing. Life support integrity compromised.
The delivery drone was at the module door, opening it. Pink heard hissing, but it wasn't from the
door itself. It was coming from around it. Given she was almost six times her old size, she may have
over-done it. Staggering forward, Pink pushed the delivery drone through the open door and wedged
herself into the gravity shaft beyond that connected the module to the central structure of the station.
She had to wedge her massive body through the doorway, one limb at a time. Her arms were so big
around that they almost filled it on their own! And her torso just barely fit, with some squeezing and
exhaling. Good thing there weren't five protein bars in that package. She'd have to find more, once she
was on solid ground.
The long, narrow tunnel of the gravity shaft loomed above her, and the delivery drone was
whisked away on an invisible wind. Once she freed herself from the hatch, Pink stepped into the
gravity stream and felt her massive body go weightless. She flew upwards, towards the rest of the
station, where low gravity awaited her – and also the rest of the crew.
They'd have probably seen the warning reports from the exercise module by now, and have
some pointed questions for her. Her body had the answers. Pink grinned to herself and squeezed her
pecs up against her cheeks one more time, sighing in pleasure. She was about to get her wish, because
every jaw was going to be on the floor when the rest of the crew saw her..
Keywords
male
1,290,534,
muscle
31,669,
rat
25,578,
muscles
17,447,
muscle growth
1,321
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Published:
1 month, 4 weeks ago
27 May 2026 11:48 CEST
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