Chapter 1: Introduction
It was in the early, early morning when Marble pulled up to the gym parking lot. Before
parking, the tiger carefully leaned over in his seat to peer through the full-length windows
lining his local RhinoxFitness’s strip-mall location. A cursory scan confirmed to him that the
gym’s condition was just as he’d been hoping to find it: devoid of patrons.
Relieved, he stopped his car, gathering his duffel gym bag and well-used blender bottle
before making his way to the entrance. It was not typical of him to frequent the gym at this
hour; for many years, he would attend his daily exercises at peak hours — engaging in
passive-aggressive squabbles over squat racks and chest press benches amongst a gaggle of
habitual gym rats. Recently though, his routine had been broken by a desire for seclusion and
privacy at the one location he felt the most difficulty hiding his worsening ‘condition’, and the
most vulnerable if exposed within.
The risk of discovery amongst a familiar and macho clientele filled Marble with humiliating
dread as he walked through the gym doors, and he impulsively tugged down on his shirt to
assure himself that his waistline was covered.
A quick scan confirmed his fears: the main
weight room was occupied with heavily-muscled patrons lifting weights and grunting with
exertion. Even though they were still some distance away, Marble felt their gazes boring into
him as he walked towards the group fitness room in the back of the gym.
As he reached the small, brightly-lit studio, Roman and Mike were already waiting for him,
standing side by side at the doorway with smirks on their faces and their arms crossed
across their chests.
Over the last few weeks, he’d had to replace the boxer briefs he was accustomed to wearing
as an adult man. Taking their place were white and crinkly adult diapers, giving his crotch a
noticable and awkward bulge at his front, and rounding out and boosting his seat in the back.
The “absorbent adult undergarments,” as his doctor had delicately described them, had
quickly become a necessity as the tiger found himself increasingly unable to retain control of
his bladder.
With casual assurance from his physician that the “bout of regression” he was experiencing
was not atypical for young men, and that his symptoms should recede with time, Marble
adapted himself to the reality that diapers were a temporary necessity for him to avoid
embarrassing accidents.
Scanning his ID tag through the gym’s front desk and exchanging an awkward head-nod
acknowledgment with the stocky bull attending behind it, Marble made his way to the men’s
locker room. As a form of added security, he strategically held his duffle behind his padded
rear, hoping to obscure his embarrassing underwear from the gym attendant’s possible stares
as he hurriedly walked into the empty changing room.
While Marble accepted his need for diapers, he still wasn’t comfortable working out in them.
To say nothing of the chafing they could cause under such strenuous motion, the tiger felt
extremely exposed to waistband peekage on the gym floor, and his tight-fit, stretchy
workout shorts did little to hide the embarrassing bulging caused by the absorbent material.
As a compromise, he’d brought along some pull-ups to change into for the duration of his
exercise.
Glancing about and moving his pointed ears to ensure that no one was in the locker room
with him, he quickly dropped trow to untape the diaper he had arrived in. Moving his paws
down to grip and undo his tapes, his ears turned back as he felt his digits squish into the
padded underpants. He was wet, with no recollection of when that might have happened.
Embarrassed that he hadn’t even noticed that his diaper was used, the big cat felt his cheeks
begin to sear with a blush — this hadn’t happened before. While his accidents were
increasingly frequent, he always had felt a sense of urgency to rush to the bathroom before
he lost control. Calming himself, he remembered the advice of his doctor — that his
regression would likely be more severe before it got better — and undid the adhesive tapes
holding his diaper to his waist.
He let out a relieved sigh as the soaked diaper
fell to the gym floor, wondering how it had managed to absorb so much liquid without
him noticing.
Marble carefully stepped out of the diaper and onto the cold surface of the locker room
floor, feeling the coolness on the bottoms of his bare feet. He knew he needed to change
into his pull-ups, but he also couldn't shake the feeling that he was vulnerable and exposed
— not just in the physical sense, but also in terms of emotional openness.
Tightly folding the used diaper into a ball and taping it shut, the tiger placed it on the locker
room bench and pulled out a pull-up from his bag. The thinner, underwear-style diaper was
decorated with blue camo patterns and had a printed-on Y-front to make it look more like
cotton undies. Wiping himself off with a man-sized baby wipe from a package contained in
his bag, Marble stepped into the protective underwear and pulled it up his legs, sliding his tail
through the hole in its elastic waistband. Grimacing down at his poofy and bulging “Y-front,”
the tiger felt humiliated by the implications of having to wear such toddlerish underwear just
to complete his workout without risking leaving more than sweat on the gym mat.
Marble hadn’t been keen on the infantile potty-training aesthetics of the adult-sized pull-ups
he bought, but found them preferable relative to the geriatic granny-panties available at his
local pharmacy. The thin diapers were a remnant of an earlier phase of his regression —
pre-diagnosis — when he suddenly found himself wetting his pants (and later bed) and was
desperate for a solution to keep his trousers dry. He’d since “graduated” to thicker and more
protective taped-on diapers after numerous incidents with leaks, but felt the pull-ups would
still be suitable for his roughly hour-long lifting sessions.
Pulling his outfit back up, the tiger looked in the mirror to investigate how conspicuous the
bulging in his athletic shorts appeared. While the pull-up noticeably rounded his crotch and
butt, it was subtle enough that it was likely to be overlooked by the average gym-goer.
Satisfied, Marble locked his bag in his locker, and grabbed his used diaper to dispose of it in
the gym’s changing area.
As was typical due to modern trends, the gym had an adult changing table and diaper pail
available for men experiencing regressive bouts (or committing to certain lifestyle choices).
Marble had seen men being changed before while in the locker room — legs up high while
their caretakers powdered them and taped on fresh diapers after a workout — but never
imagined he’d have to make use of these amenities himself. He cringed at the thought of
being on display in such a way, and shoved his diaper into the oversized pail to get on with
his lifting routine.
Shortly after emerging from the locker room, the tiger began warming up with a jog on a
treadmill within the gym’s organized rows of cardio equipment. As he transitioned his jog into
a faster pace, he felt grateful that the reduced thickness between his legs offered by his
pull-ups did little to impact his running form. Within a few minutes, he was fully able to
ignore the embarrassing presence under his shorts, and settled comfortably into a confident
stride.
His composure was quickly disturbed by the jingle of the gym’s front door, and the rowdy
shouting that followed it.
With a groan, Marble recognized Roman’s voice and Mike’s deep
laugh, and realized the two were making their way towards the weightlifting section.
“You’ve got to see this, man!” Mike exclaimed, pushing aside the tension curtain that concealed
the weightlifting zone. Roman laughed, and the two sauntered towards the bench where
Marble was working out.
The tiger’s face flushed with embarrassment as he felt exposed in his pull-ups, clutching
the bar to steady himself.
He couldn't help but feel a sense of vulnerability and humiliation;
his heart raced and his mouth went dry as he realized he was exposed in his diaper,
completely unaware that his accident had even occurred.
Roman's voice boomed with laughter as Mike nodded in agreement, eyes fixated on the
tiger's blushing cheeks and tightly crossed legs.
"Our little Marble here seems to have forgotten to put on his Big Boy
Undies!" Mike remarked, unable to contain his amusement any longer.
Marble's ears flattened, his tail twitching nervously, as he attempted to push
back against the weights. "N-no! I did-did... put them on," he stammered, his
voice barely audible.
Roman's eyes narrowed, hands flexing on the bar. "Is that so?
Well, I guess we can test that out," Roman said, a mischievous glint in his eye. He walked over to the tiger, who was still struggling with his barbell, and took it from him, setting it back down on the ground.
"Now, Marble, I want you to tell me what happened to your diaper," Roman said, a smirk on his face.
Marble's mouth opened and closed wordlessly, his eyes wide with fear and embarrassment. He didn't know how to respond, not wanting to admit the truth about his accident.
Roman's
smirk grew larger, and Marble felt a cold knot form in his stomach. He knew what this meant -
a punishment, perhaps, or something worse.
But the thought of being left in his wet diaper all night made his stomach churn with nausea.
Despite his fear, however, Marble knew he couldn't deny the truth. So, with a heavy heart, he
confessed to his mother that he had an accident while playing hide-and-seek with his friends.
His mother listened, her expression softening with pity as she realized how upset her son was
about his mistake.