Jason Grows Up – Part IV: Leg Day

[kenstaff]

Other parts of this and other stories here.


Another grueling workout in the basement gym left Jason completely spent after having found his dad’s latest gift for him in the form of new clothes, sneakers, duffel bag and workout gear. The beefy teen had excitedly turned on his new TV and put on one of his many workout DVDs in anticipation to try on all the his new threads. After getting distracted by a quick warm up set of arm curls however, Jason simply couldn’t resist the slight pump in his arms from the light reps and so kept putting off trying on the new clothes in order to do just one more set of curls.

After a half hour of intense alternate dumbbell curls, barbell preacher curls followed by punishing forearm torture at the preacher bench, Jason was left with arms so big his scientist dad had managed to make a bit of a mess behind the two-way mirror in his laboratory.

The engineer had planned on enjoying a beefy fashion show as his big boy tried on all the new and tight revealing clothes he’d purchased for him - instead he was treated to an impromptu arm pump that unexpectedly expanded the size of Jason’s arms by another inch – giving his dad an unplanned thrill while biting his knuckles in careful silence.

Jason kept flexing and grabbing and squeezing his heavy, thick and swollen arms, causing the big teen’s body temperature to continue rising after the intense arm workout. Noticing drops of sweat streaming out from under his dark hairy armpits, Jason blinked and felt the sweat on his brow.

The engineer whimpered again at the sight of his huge, now arm-jacked teenager - as Jason peeled off his sweaty T-shirt, runners, socks and finally, his pants. The huge muscle kid was left only wearing tired and sweaty briefs that bulged to straining at every thread - as if they’d been banished for their last remaining existence to suffer the impossible confinement of his energetic and youthful but enormous and hairy muscularity.

Jason moved to the back of the basement gym – to the sturdy steel squat rack. It was time to work legs. The confident teenager’s strut made his bulbous, protruding muscular ass cheeks rise and fall with each stride – only adding further stress, exacerbating the deterioration of his sweaty briefs that had already suffered an entire day of tireless stretching in order to encompass his enormous teen ass and the constant strain of Jason’s hormone-enriched and muscle-enhanced crotch.

By the time Jason reached the squat rack, his dad had already reached his second orgasm from behind the two-way mirror. It’s unexpected arrival had left the scientist completely unprepared as his gushing creamy liquid splashed against his side of the mirror with urgency - from the sight of his huge teen’s muscle ass ripping through its own underwear as Jason took his last few steps towards the heavy metal apparatus.

Jason’s briefs had finally reached their end as the last thread snapped from the tiniest amount of room it was forced to give up, in order to allow Jason’s light dusting of dark butt hairs to grow a fraction of a millimeter up from his ass crack in response to his rising testosterone levels from the latest muscle growth in his arms.

The thud and slight vibration in the mirror had luckily happened right when Jason had noticed his underwear falling apart. The engineer stood motionless in his lab, struck with fear Jason had heard the thwuddd!!! The man held his still twitching erection motionless, as cum slid slowly down his side of the mirror after its extremely brief yet crucial journey towards the object that had persuaded its immediacy.


“I’m so huge, my underwear can’t hold up!” Jason chuckled out loud to himself.
The scientist heard the teen’s cocky statement and it made his cock swell into such a heated throb that it broke the moist seal his hand had formed around it. The engineer looked down wide-eyed as he pulled his hands away from the intense heat emanating from his crotch. The man watched in shock as his penis swelled and grow into new dimensions of size that left him stunned by what looked like a cock he would never otherwise recognize as his own.

Now naked, Jason looked back at the pile of new threads and shrugged and smirked as he continued loading plates onto the squat bar. He had decided not to destroy brand new clothes that his dad had just purchased. He was simply to huge for clothes to contain and he wanted to save the new threads, at least until he was in-front of a crowd of shocked onlookers anyways.

Jason continued working out his legs at the squat rack, followed by intensive leg lifts and by the time the big muscle boy approached his last leg exercise, he spotted what looked curiously like a single glass of protein with an orange colored bow around it – and he was absolutely sure it hadn’t been sitting atop the weight rack earlier.

Jason’s dad had enjoyed his muscle teen’s leg workout so much, he risked getting caught and had sneaked out of his lab with a quickly created muscle-growth enhancing protein shake for Jason, complete with a bow he managed to tie around the rushed-to-clean lab glass, while Jason had struggled through his last few reps at the squat rack. Reps that had ultimately brought about pressurized veins that continued to pop-up and swell-out all over Jason’s jacked-up and youthfully hairy muscle body. The sight had made his dad so turned-on that the engineer wanted Jason to retain the veiny jacked-up freaky pump – that seemed to make his hairy young body impossibly hard and huge.

Jason approached the protein drink with confusion and a furled suspicious brow. Suddenly the big muscle teen had the urge to run upstairs, thinking his dad must be home and had come downstairs with the shake but saw him working out, so had left it for him. Jason wanted to thank his dad so much and as he turned to dash up the stairs, his muscle-memory gripped him with an excitement and adrenaline rush so strong he was unable to resist it.

Jason grabbed the glass of protein shake and tore off the bow with an intestine hunger he’d not felt before – leaving him surprised by his own actions. The big muscle teen guzzled down the entire glass of mixture, his eyes following the level of liquid in the glass as it drained out and into his mouth and down his throat.

He was finished within seconds and was left standing with an empty glass, while his eyeballs darted left to right in fast succession in wonderment who had taken him over with such gusto and hungry power to consume the protein drink.

Jason put the glass down and turned around, shrugging off the anomaly but his heart picked up its pace and he began to quickly feel very excited and extremely horny. The big teenager’s eyes locked on to the leg extension machine and the world seemed to stop around him. He felt as though everything around him was in slow motion but him and that if a pin dropped it would sound loudly in his head with an echo that could reverberate forever within his mind. The teenager felt as though he could lift anything on the planet and could crush the heaviest metal into a flatness that it would surely implode into its own dimension.

He felt his heart racing but his breath was loud and slow and his bit naked footfalls thumped and bonged inside his head as he walked towards leg extensions.

Jason felt every striated muscle fiber in his body as he lifted his huge, hairy naked muscle leg and glute up and over the seat of the leg extension machine. The air swooshed up and in between his newly-haired muscle-heavy protruding ass cheeks, caressing the walls of his deep ass crack. Jason moaned in pleasure as he felt the temperature difference between his hot ass and the cool air, as if the atmosphere was touching him intimately. The surreal pleasure brought about by his hefty and weighty muscles and their affect on the air him, as he moved – almost as if his heavy muscles had their own gravity.

Jason lifted his legs up and took the weight of the extensions with ease, finding the four 45 pound plates he’d added to the back stack of the extension machine so light, he was sure there was not enough weight in the basement to match the strength he felt his legs could lift.

The scientist tried his best not to touch his newly sized erection while watching his giant teenage muscle-boy lift the first set of leg extensions with such ease, the boy’s giant thick and hairy legs seemed to fly upwards at each rep.

Jason got up after countless upward leg throws, the first set had left him almost dizzy from the deep air intakes he’d unknowingly been taking.

The room seemed to spin as he stood in front of the two-way mirrors, his legs completely jacked and flared out at his knees. The sight almost made his dad faint in his lab, making both of the family-males apparently light-headed by the youth’s muscle-induced situation.

Jason regained his balance and thought of nothing other than to load heavier weight and turned back towards the weight rack behind the leg extension machine.

The sight of Jason’s ass after the incredible heavy squats he had struggled through and the weighted leg lifts that left his hamstrings pumped as if they were biceps on the backside of his legs – left the teenager’s hidden dad awestruck. Jason’s ass was now protruding so far out into bubble muscles from his back-side, the teenager would undoubtedly never again be able to find another pair of pants that would allow such bulbous butt cheeks.

The boy’s ass hair was now thick and manly and the sight of it seemed to enhance the look of such a young boy’s giant muscle-ass, that it now made Jason’s giant butt appear so obscene that…. – oh, oh… ohhhhh, there it is!! The scientist’s newly huge cock erupted yet again into uncontrollable spasms of whimpering jizz that appeared to leak its way out of his cock slit with an embarrassing lack of pressure. The dad’s cum seemed to slowly leak out of his wildly thrusting and throbbing horny cock and the ironic juxtaposition of the two opposites left the engineer only more turned on by the fact his huge muscle teenager made him orgasm in such a strange way – a way that left him empty of cum from earlier orgasms but yet that seemed to give the impression his body had been forced to make more cum in order for him to orgasm again - from the sight of his teenager’s other-worldly gigantic protruding hairy bubble teen muscle ass.

Jason finished piling on as many of the heaviest weights in the basement the leg extension machine could hold. His resulting set was so intense, his dad had watched in disbelief and growing horror as a crack slowly formed in the two-way mirror from the giant muscle boy’s deep groans from such a strained exertion, his lower body was forced to grow into a new dimension of muscular indecency.

The huge kid had pushed himself to new limits for his last few reps of the final set that solidified his pump into permanent muscle. A set that would leave the huge teenager’s body in his new-found state, up-sized to incredible proportions - thanks in no part to his horny and still whimpering dad who remained hidden on the other side of the basement gym’s two-way mirrors.


End of part IV

[daybird2]

Just keeps getting better and more interesting.

[iceman75]

Wow, isn't that something? That Jason so turned his dad on that he had cum 3 times and even though he was supposed to be completely drained of cum, his balls were forced to make more simply because his son was so incredibly erotic! Another incredible story, Kenstaff, keep it up! (Looking forward to Tad High a lot!)

[Kit Werecat]

YIKES!!

This kid is starting to turn Godlike! Those LEGS and BUTT!

Is the kid getting taller too, to hold all that mass? Or is he just turning into a WALL? I get the impression that in spite of the increased muscle bulk, he still is beautifully sculpted in form and symmetry.

I know such things are potentially possible, because I've seen a few artist friends who really know anatomy manipulate certain muscles to build the overall strength, without deforming the body symmetry. This allows the subject to maintain flexibility, grace, and overall balance. It keeps the center of gravity likened to that of gymnasts.

It has to do with amplifying and bulking up the lesser, underlying muscles to scale up to join the typically-affected ones, thus making him grow in combined size and strength, without just simply over-inflating the major ones like big balloons. It's a very pleasing look aesthetically, and is theoretically possible, if you could invent a formula that enlarged ALL the skeletal muscles radically.

This is kind of hinted at when it's pointed out that normal clothes simply won't fit Jason any more. There's more than just bulking up to bigger size going on here. Again, my artist friends have shown me the problem.. Suddenly, the waist of the shorts gets too baggy and loose, while the leg openings and hip area simply cannot accommodate the quads and a power-butt such as described here. Arms make sleeves virtually impossible, chest and back muscles simply expand so much in normal movements that the seams will rip unless you put him literally in a gunny-sack or MuuMuu. And you can never dream of having clothes that connect your upper torso to the lower one, because it will rip out every time you bend or flex there. Bare-midriff will be the rule from then on.

My artist friends showed that if a person developed to that degree, the most practical apparel would be a Kuroneko or Rokushaku Fundoshi (a kind of Japanese T-back loincloth - Google it) clamping it to the body with a metal chain-mesh belt encircling the narrow waist.

That's a dress-code I wouldn't mind seeing!



I noticed that this story has morphed, like Jason, to an incredible study of how a body can grow in such a delightfully awesome, and sexy way. What soon becomes evident is that this type of growth is as exciting to personally experience as it is to watch.

SOOooooo Sexy!!

The presence of the heady drug influences only help to make the transformation even more seductive in it's enticement, and exotic and erotic in its affects on a person. Like being embraced in a magic spell that makes you grow while you're in that twilight, half-awake-half-asleep moment. It's a wonderful way to grow big.


Thanks, Dad. Nice job.

You too, Kenstaff.