My Grandpa is a Muscle Beast Ch.1-3

[Bigboi]

**DISCLAIMER**

This fictional story includes taboo themes (incest). So if you're not into incest, then this story ain't for you. 

Chapter 1

Burt Hoffman is an old farmer in the state of Texas. He is a skinny 80 yr. old man, weighs 120 lbs., with a height of 5'10, sporting a thin mustache and white balding hair.  During farm work, he was always wearing the same old baggy red plaid shirt, jeans, dark blue bib-and-brace overalls, brown boots, and a handmade wheat hat. He has been working on his family's farm since he was 12 years old. After his parent's passing, he continued to work on the farm as his only means of livelihood. 

Burt and his grandson, Gary Hoffman, have been very close since Gary was 10 years old. Gary enlisted in the army after his 20th birthday and left the rural town. Burt and Gary never missed a chance to exchange letters with each other during their time apart. 

Gary would eventually return to town after 15 years, only to deliver the news to his grandfather that he was retired. He would stay with his other relatives in New York for a while to plan his next endeavor in life.

Burt was happy for Gary with his retirement and new life. Gary would visit back to the farm quite often to help Grandpa Burt with the farm.

A year later, Gary told Burt during his last visit that he would take permanent residence back to the farm to help his grandpa. Burt wanted to reconnect with his beloved grandfather after years of no physical contact. Grandpa Burt was delighted with this news, wanting to spend the rest of his days with his beloved grandson. 

- A month later... in the fields of the farm-

Grandpa Burt was excited as he worked on his farm duties. Tomorrow is the day his grandson will stay with him on the farm. But he was also nervous because of the strange feelings that he developed from all the times that he spent with Burt after his return.

It was a surprise that Gary never pursued any romantic relationship or showed any interest in anyone. He asked his grandson every time they met if he ever had anyone he was interested in. And Gary would always tell him that no one would want a useless muscle head. However, Burt thought differently, especially when he and Gary would work. Gary often works shirtless because says that doing any farm work with clothes feels way too constricting.  At 38, Gary had developed a 230 lbs. bodybuilder body due to his time in the army. Well-defined chest, abs, shoulders, and arms, and with a light dusting of salt and pepper hair on his torso make up his virile body. And his face... he was like modern-day Zeus. Gary's face looked rough with his piercing blue eyes, his angular jaw, and his white well-groomed beard and full head of hair. But despite his tough look, he was caring and gentle, especially around his Grandpa Burt.

It was then Burt realized that he had developed taboo love with his grandson. But he knows that his feelings are wrong, disrespectful, and most of all disgusting. Due to his old age, he did not want to ruin his relationship with his grandson after all these years apart. Still, needs to find a way to suppress and change his feelings for Gary before he ever regrets it.

Burt was plowing his fields when he stumbled upon something unusual.

"What the fuck is this thing. It's glowing too..." Burt said while getting closer to a massive crater.

Something was shining in the middle of the crater. It looked like a  meteorite that had fallen from outer space, crashing onto his land. Without thinking twice, he went closer and picked it up. Suddenly a sharp pain spread across his body, like lightning struck him. He woke up after being knocked out. Burt forgot what had just happened due to the sudden shock. Then, he noticed that a rock began to disintegrate into nothing. He was confused for a second, but quickly dismissed it and went back to work.

If only he knew that the following events will change his life forever.

-8:00 PM / Farmhouse-

After finishing his dinner, he decided to sleep early to prepare for tomorrow. He brushed his teeth and went straight to bed.

As soon as he entered his bedroom, ready to flop down on the mattress, he felt a sudden surge of energy coursing through his body.

His skin began to tingle, and his muscles started to tighten. Beads of sweat began to cover his body.

Grabbing his chest, "Shit, what's happening to me?!"

He stumbled backward and fell with his back on the bedroom door. Grandpa Burt's body began to throb slowly as his body produced more sweat, and gritted his teeth in pain. And after a few seconds, his body began to pulsate even faster. 

Suddenly, he felt his chest push further away from his body every time it throbbed. It also started happening to his stomach, arms, legs, neck, and back. 

Grandpa Burt's pair of boots started to feel increasingly snug around his feet. The sensation was initially subtle, barely noticeable, yet gradually intensified as he felt his frame continued to change. It wasn't just his feet that were experiencing a transformation; his legs too were undergoing an extraordinary transformation. With each passing moment, his thighs, calves, and ass seemed to swell, causing his jeans and overalls to stretch taut against his newfound bulk. A surge of power coursed through him, traveling through his torso as his abdominal muscles began to bulge, pushing their way outward from within his body. His back, meanwhile, displayed similar signs of change, displaying increased strength and definition in his lats and trap muscles. Blood rushed towards his pectorals, which expanded further still, straining the buttons on his plaid shirt to the point where they eventually flew off into different corners of the room. As the transformation progressed, Burt noticed that not only did his arms expand with mass, but so did his hands, growing larger and more rugged. Simultaneously, his neck thickened while his trap muscles continued to develop. The combined growth of his back, lats, traps, neck, and pecs caused his plaid shirt and the top of his overalls to burst, and torn pieces of fabric went flying in all directions. The growth was reaching its peak when Grandpa Burt's face underwent a dramatic alteration. His features changed, becoming more pronounced and masculine, as the heat emanating from his body became palpable. 

 

With slow and steady movements, Grandpa Burt tried to stand up. But he quickly fell to his knees as he felt the last part of the change takes place. While on his knees, Grandpa Burt groaned and grimaced with each passing second as he felt his aching penis grow larger and harder against his clothes. He moaned and groaned as his growing cock continued to swell. Finally, the growth came to an end as his overalls and jeans exploded from his monstrous tree trunk legs, leaving behind a once skinny old man, into a colossal figure of pure masculinity.

Grandpa Burt had transformed into a towering giant of a man, with thick, curly white hair covering every inch of his body. He finally had enough strength to stand up from his knees. His chest was massive, with ripped abs and pecs that seemed to stretch on for miles. The white briefs remained attached to him, though they stuck to him so tight and threatened to burst at a single flex of his ass muscles and cock.

"Holy shit, what the fuck happened to me?", he said while panting.

"Wait, was that my voice just now? Oh fuck my voice got deeper!", he exclaimed as he got startled by his now deeper voice.

"Oh fuck, it's so tight.", his mind suddenly focused on his growing cock.

He could feel his cock growing harder and longer with each passing second, straining against his jeans and overalls.

"Shit, look at these arms. I'm huge!"

As he flexed his biceps, he couldn't help but marvel at how much stronger he had become. A wet spot began to form on his jeans as his balls had transformed into a cum factory.

The memories of his old self were still fresh in his mind, and he struggled to come to terms with this drastic transformation. That is until his curiosity overtook his concerns.

"Only one way to find out how big I've gotten."

Feeling a sudden urge to see himself in the mirror, he turned towards the bathroom and caught a glimpse of his reflection. What he saw left him utterly speechless.

Grandpa Burt's transformation was astonishing. The frail figure that once stood before him had vanished, replaced by an imposing mountain of raw masculine power. Gone were the days when his bones seemed to poke through his skin; instead, they were hidden beneath a solid layer of muscle. What once weighed just 120 pounds had swelled to a staggering 450 pounds, turning Grandpa Burt into a veritable colossus. Despite this drastic change in physique, there were some aspects of his appearance that remained untouched. His wrinkled face still remained, although it had taken on a more rugged, masculine air. Thick, caveman-like brows framed his eyes, while his once-bald pate had sprouted a covering of short white hair. A sparse stubble adorned his face, adding a touch of virility to his mustache. As he explored these new sensations, running his hands across his chest, he couldn't help but marvel at the dense layers of hair and bulging muscles beneath his fingertips. 

 

Grandpa Burt now fully savored the results of his muscular transformation. As the beast looked down upon himself, he marveled at the sculpted body that emerged before him. His once-flabby midsection had been replaced by an impressively toned six-pack, each individual ridge standing out prominently against his newly acquired muscle mass. The growth wasn't limited to just his abdominal region; his massive chest also displayed a remarkable development. The previously unremarkable nipples were now noticeably visible beneath the layers of his chest hair as they stood hard and erect. His arms, which had initially seemed weak and feeble, had evolved into a pair of formidable monster-like arms. Grandpa Burt could hardly contain his excitement as he admired his newfound strength. His entire body was covered in a fine layer of snowy white fur, adding an extra touch of elegance to his appearance. Bulging veins crisscrossed his neck, chest, abdomen, and arms, further accentuating his newly developed physique. With pride swelling within him, he flexed his arms into a double bicep pose, reveling in the sheer power emanating from his enhanced physique.

"Hell yeah, I'm a fucking muscle beast!"

Having lifted both his muscled arms, his powerful musk from his hairy sweaty pits and body filled the bathroom. This sudden muscle growth was too much for him to contain as he felt the erect caged beast straining against the remainder of his clothes.

"Let's see what kind of monster my cock has become…" Grandpa Burt said with lust in his manly voice. 

Now with lust surging in his mind and body, he used both of his beast-like hands to tear away his straining white briefs in one swift motion. His now 12-inch beer can thick erection sprang free from its cage, bobbing and throbbing eagerly in front of him as it constantly leaked precum. The hairy bush surrounding his cock had also grown, connecting to the white happy trail on his muscled torso.

"Oh my god, is this veiny monster really mine?"

With Grandpa Burt's muscle cock being freed from the confines of his white undies, the manly musk coming from his pits and cock was so intoxicating that it sent his libido to maximum levels.

"Hmmm I thought I would smell disgusting..."

He then brought his face on his left hairy pit and inhaled his natural musk.

"but I smell so fucking good!", he roared

With his left hand, Burt cupped and massaged his big and hairy balls, which are hot to the touch. And wrapped his meaty right hand around his monster cock, stroking it slowly, feeling the thick veins mapped around his newly grown manhood, and savoring every moment of this new experience. All the while admiring his new masculine face and beastly body.

"Oooohhh, this ultra-masculine body is so hot and sexy. And I look so handsome too..."

Grandpa Burt slowly dragged his left hand from his balls to the rest of his muscled body. With his meaty hand, he traced the massive expanse of his being. The ridges and blocks of his hard cobblestone abs, his bulging mountains of pecs, his globe-shape delts, and his monster-sized neck. He massaged his jaw, feeling his stubble and mustache which greatly turned him on. Returning to his chest, he alternately pinched and massaged his erect nipples. He began to beat his cock with more caress, wanting to explore every part of his massive shaft. His hand landed on his bush as he stroked downward, feeling every throbbing vein on his pole with every stroke, and massaging the tip and piss slit of the bulging head of his cock. From his cock leaking a steady amount of precum, his monster manhood now leaked like a broken faucet as it kept spraying large amounts of precum.

He spat his spit on his cock, adding another layer of lube from his precum. His precum and spit covered his meaty cock, which made him increase his pace even more. 

Burt grunted and muttered to himself, "Hmmmm yes. Big fucki'n muscle cock... musky beast body."

The new muscle beast body and monster cock that Grandpa Burt now possessed greatly turned him on as his muscle worship went on. He was now the biggest in town, and the thought that perhaps he could get bigger crossed his mind. Yes... He will be even bigger. The biggest in the world! And bigger than Gary!

... Gary.

Suddenly, Grandpa Burt's memories of his beloved grandson flashed before his eyes. And Burt's mind lingered on all the times Gary worked shirtless with his hot and sexy body exposed.

Gary's hairy muscled body...

"Oh my beautiful boy..."  *stroking his cock faster*

His handsome face...

"I love you so much" *twisting his left nipple*

And in his mind, Gary smiled and whispered something that would finish Grandpa Burt's self-loving session.

"I love you too daddy." His words echoed through the real world

And with that reality-snapping response, Grandpa Burt flexed every muscle of his body and roared like a beast so loud that it shook the walls and the mirror.

"GRRRRRRRRRRRRRAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHHHHHHH !"

And his now purple-muscle beast of a cock erupted like a volcano, spewing gallons of thick, hot, and heavy cum all over the bathroom. Cum splattered on the walls, the mirror, the floor, the ceiling, and Burt's tense muscle body.

"FUCK YEAH MOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOORRREEE"

He continued to pound his meat with his right hand, while his left arm was flexing with every fiber of muscle along with the rest of Grandpa Burt's body.

After cumming for about 3 minutes, his cock stopped emptying his massive balls and began to slowly deflate. Grandpa Burt staggered backward on the cum covered wall and sat down to rest. He had a smile on his face, still reminiscing the memories of Gary in his mind. Lifting his huge right hand to his face, curiosity and his remaining lust still enveloped his mind as he licked his muscle beast cum on his paw. 

"Hmmmmm~ sooooo goooood."

He then decided to clean up all the cum in the bathroom before it dries up. His new height enabled him to clean the ceiling of the bathroom with ease. Discarding his shredded clothes in the trash, Burt proceeded to clean himself in the shower with cold water to cool down his body. After 15 minutes, he exited from the shower and dried himself up. Watching himself dry his body made him horny again as he moaned with renewed lust. Grandpa Burt raised and flexed his left arm, bringing his engorged bicep to his face. He then licked and sucked on his flexed bicep while groping the rest of his beastly form with his right hand. 

And after 5 minutes of muscle worship, he decided to lay down and rest on his now small bed.

Lying down in bed with his glorious muscled body exposed, Grandpa Burt now pieced together that the changes were caused by the meteorite he found. Whatever power inside the meteorite must have transferred to his body immediately after making contact. But even though he felt more powerful than ever before, there was still a nagging sense of unease deep inside him. Deep inside, he still felt locked in a cage of shame despite his growing confidence.  

Grandpa Burt couldn't help but marvel at the sheer size of his immense frame. He couldn't help but wonder about what the future held for him as he pondered on the mattress. Would he continue to grow? Would he become even stronger? And what would Gary think of him now?

Deep inside, he still felt locked in a cage of shame despite his growing confidence. All these boasting about his newly muscled body to himself could not free him from the shame of falling in love with his beloved grandson.

These thoughts swirled in Grandpa Burt's mind until he drifted off to sleep.

To be continued...

 

Note: First attempt at a story, lemme know what you think. thanks for reading

 

[RC0116]

Good job, it has a very good start and there is a lot of potential in this story. Can't wait for the next chapter.

[neverbigenoughmuscle]

Hope grandpa goes back for more meteorite 

[boardman]

Hot as hell

[kramberry]

Absolutely amazing start, can't wait for the next chapter!

[gymratX]

Hot story so far, feels a bit bullet pointy but the only way to get better at writting is keep writting and if all your ideas are like this pls do keep writting

[Bigboi]

Notes: Thank you for your support and comments. I wrote this story because I wanted to add more tf stories of old men or grandpas, and let out what my horny mind thought of.  I'll try to improve more with my transformation descriptions in the future. Now here's the 2nd chapter of the story. 

 

Chapter 2

In Burt’s dream, he dreamed of himself growing even bigger. Lifting cars with one hand and throwing them across the streets. He saw himself standing next to his grandson, who looked tiny compared to his massive frame. 

As he slept, Grandpa Burt's body continued to change.

His muscles grew larger and more defined, making his bed give in with his increasing muscle mass. The white body hair enveloping the beast became denser. Beastly pecs growing fuller, thighs and calves bloated with muscles, biceps beefier and another row of abs appeared giving him an 8 pack. His legs grew into massive tree trunks and his muscle ass ballooned with more mass, lifting his massive frame for a few inches off the bed. During the duration of the changes, Grandpa Burt's erect and hard 12-inch cock grew in length and girth. The growing cock throbbed along with his body, stimulating it with increasing pleasure. It leaked large amounts of delicious precum while running down his pole, and soaking the sheets. He unconsciously grabbed his pulsating cock and slowly stroked his manhood. After a few minutes, he exploded with his cum raining everywhere in the room and covering everything in white hot cum. Even then, he did not stop beating his manhood, creating a cycle of pleasure for the rest of the night. 

 Despite the rapid transformations happening within him, Grandpa Burt remained blissfully unaware. He simply lay there, dreaming of the incredible power coursing through his veins.

Grandpa Burt woke up and was shocked by the amount of dried cum across his bigger frame. The bed had completely given up. The bed, floor and ceiling were also covered in cum.

"Holy fuck, I grew in my sleep. Look at the amount of cum everywhere."

He got up from bed. And went to the bathroom again to admire his newly grown body.

Veins bulge across his body. His erect nipples had noticeably puffed out. His body hair had also become denser. His 450 lb frame had grown to 650 lbs of gigantic proportions. And his endowment grew into a hard 20-inch throbbing monster cock. He flexed his body into different bodybuilder poses. Each pose made his body look more muscular and dense. 

"Shit, I got an 8 pack. I am a titanic muscle-bound monster!"

Grandpa Burt was more energized. He no longer needed to prepare breakfast as he aimed his throbbing cock at his mouth, and sprayed his cum into his gaping mouth. Grandpa Burt felt the first ropes of cum hitting the back of his throat, while some landed on his face, lips, and beard, giving himself a full early breakfast facial. 

"My muscle cum tastes so good, and I feel like it energized me more!"

After savoring his delicious breakfast, he realized that he no longer needed any other food to supply his huge body with nutrients as he knew that the delicious cum from his transformed balls is now providing him with the sustenance that he needs. Grandpa Burt went downstairs to test his new power and strength. The beast had an idea to test his new beastly body. He went to the fields naked and went straight for the big tractor.

He took a deep breath and sighed before he began his test of strength. With his immense strength, he effortlessly lifted the front part of the tractor and pulled it towards him. He hardly broke a sweat. Then, with a mighty grunt, he ripped it apart, twisting metal as if it were paper. The sound of tearing steel echoed throughout the field as Grandpa Burt revealed his true power. He started to get hard from his display of incredible monster strength. This time though he wanted to taste his now 20-inch beast cock.

With his newfound strength, he easily tore down the door of the barn and entered. The smell of hay and animals filled his nostrils as he made his way to the center of the barn. There, he lay down on his back. He grabbed his huge cock and started stroking it, feeling the thick veins pulse with each stroke. As he stroked, he watched his cock grow larger and harder, the head turning red and swollen. Soon, he could feel the first drops of pre-cum oozing out of the tip.

Grandpa Burt closed his eyes, and clenched his teeth, enjoying the sensation of his cock growing bigger and harder.

He had never felt such intense pleasure before, and he couldn't help but let out a moan of delight. As he stroked his cock, he thought about Gary and how he would react to seeing his once skinny grandfather turn into a muscle god. Would he be scared? Or turned on? Grandpa Burt didn't know.

He sat up and began to go down on his massive cock and sucked it. He managed to get half of the length of his cock down his throat. 

The massive old man savored the taste of his manhood, especially the oozing precum which he delightedly drank. Everytime he moaned out his pleasure, it sent vibrations to his mouth, further stimulating his massive cock. Lost in ecstasy he started to thrust his hips up, deep fucking his mouth. With a final thrust, he shot his load, sending ropes of hot cum down his throat. He let out a loud groan as he came, feeling the intensity of the orgasm coursing through his entire body.

When he opened his eyes, he saw that his cock was still hard and oozing precum. He reached down and began stroking it again, watching as it grew even larger. He couldn't believe how much power he was feeling - it was unlike anything he had ever experienced before.

Suddenly, he heard footsteps approaching from outside. Grandpa Burt panicked, quickly covering his massive cock as much as he could with his giant hands and rushing out of the barn. When he emerged, he saw Gary standing there, looking at him with wide eyes.

"Grandpa?! What the hell happened to you?" Gary exclaimed.

Grandpa Burt tried to speak, but no words came out. He simply gestured toward his enormous body, unable to explain what had happened. Gary looked at him in disbelief, his eyes wide with shock.

Inside the house, they settled down in the living room. Gary tried to make small talk, but all he could do was marvel at what his grandpa had become. He kept staring at Grandpa Burt's body, clearly struggling to process what he was seeing. Finally, he couldn't contain his curiosity anymore.

"So, um... what happened to you grandpa?"

Grandpa Burt sighed deeply, running a hand through his thick beard. "Alright, listen here son. I found this meteorite yesterday and it transformed me into this," he admitted softly. 

Gary looked at him sadly. "It must been painful," he said softly. "But I get the feeling that you are getting used to your new body based on what I just witnessed."

Grandpa Burt awkwardly nodded. "It's been a lot to process," he agreed. "But honestly, it didn’t take that long for me to actually like it. It feels... incredible," he admitted with a smile.

Gary nodded slowly, still trying to wrap his mind around the changes he was seeing. "Well, whatever happened to grandpa, I think it looks good on you."

Grandpa Burt smiled warmly at his grandson. "Thank you, son. That means a lot coming from you."

They sat together in comfortable silence for a few minutes, neither one knowing quite what to say next. But eventually, Grandpa Burt found the courage to open up about his feelings about Gary.

"You know, son, there's something I need to tell you," he said hesitantly. "I... I think I'm in love with you."

At those words, Gary's eyes widened once again.

He hadn't expected Grandpa Burt to confess in such a way. He stuttered for a moment, searching for the right words to respond.

"I... I don't know what to say. This is all just so sudden. I mean, first your transformation, and now you’re confessing that you love me?"

Grandpa Burt began to grow anxious with Gary’s response. 

"I know it's a lot to take in. But I can't deny how I feel any longer. I have always loved huge and muscular men the moment I realized I was gay. I closeted myself all these years because I didn’t want you to look differently at me. And ever since you came back, I couldn’t help but admire the man you became. Soon, my admiration turned into something disgusting. I’m so sorry my boy…” 

“Grandpa Burt, if you’re going to confess your deepest feelings to me, then I must also tell you what I truly feel as well.."

Grandpa Burt’s heart suddenly dropped from his chest, not ready for whatever Gary would say next.

“Ever since I started helping you on the farm, I would always catch you stealing glances at me. I could just feel you admiring and lusting over my body. At first, I felt uncomfortable and uneasy with the way that you were looking at me.”

Tears started to form on Grandpa Burt’s face, shame and disgust surging through his entire shaking body.

“Gary, I’m so sorry I-”

But Gary immediately raised his finger to shush his shaking grandfather

“But over time, I began to enjoy the way you looked at me. The thought that I was making the person that I cherished the most in the entire world is getting turned on with my muscled frame filled me with overwhelming joy.”    

“Son, w-what are you trying to say?”

“From my time serving in the military, all I could think about was you, Grandpa. Every time I heard back that you had gotten sick, I felt like I made the wrong choice in joining the army. I wanted to be there for you and take care of you...”

Gary gently caressed his grandfather’s chiseled face, wiping the tears away as he spoke.

“The reason I stayed longer in the military was because I wanted to be stronger for you grandpa. I dedicated the remaining time I had to become who I am today. Someone who is strong enough to help you and take care of you.”

Holding his grandpa’s face with both hands he said, “ Right now, I see this as the next step in our relationship. No more secrets. This… is how I truly feel.”

And with a gentle motion, Gary softly kissed his Grandpa Burt on his lips.  

Gary's words and actions surprised Grandpa Burt. He had never expected Gary to reciprocate his feelings, especially with everything that happened. But hearing Gary also admit his love filled him with a sense of joy and relief that he had never experienced before.

"Thank you, son," he whispered, tears forming in his eyes. "That means more to me than you'll ever know."

Grandfather and grandson embraced tightly, their bodies pressing against each other in a show of affection.

Grandpa Burt felt a surge of happiness wash over him as he held Gary close, savoring the moment.

"Thank you for sharing your true feelings with me, Grandpa Burt," Gary whispered into his ear. "But, how are we going to deal with the rest of the town and the family."

"Don't worry my boy," Grandpa Burt replied, kissing him gently on the cheek. "We'll figure these feelings out together."

They spent hours talking, exploring their newfound feelings for each other. As they talked, Grandpa Burt directed their conversation more about how they were going to deal with the people’s reaction to their forbidden love. Gary had no problem keeping a secret from the rest of their relatives since they trusted him enough. Grandpa Burt was also happy with the new and forbidden direction of their relationship since he was too old to care about what the world might think. And no person in the entire world would ever dare to question their love, fearing that any unlucky soul would face the wrath of the biggest grandad in the world.

After a long day. Gary gathered the courage to ask Grandpa Burt a daring favor.

“Hey grandpa, can I ask you a favor?”

“What is it my boy?”

“Can you pose for me? I know it's a little late but, my dick’s been aching since I saw you sucking yourself back in the barn house, and it looks like I’m at my limit.”

Without saying a word, and with a sly grin, Grandpa Burt began striking various bodybuilding poses that showed off his impressive physique. His muscles rippled and popped as he moved, displaying his raw power and strength.

"Look at these massive guns baby boy!" yelled Grandpa Burt as he raised his arms in a double bicep pose."

"My god, you are incredible, Grandpa!."

Gary couldn't believe his eyes - he had never seen anyone as strong and imposing as Grandpa Burt. He marveled at the size of his arms, legs, chest, and back, each muscle group more defined and pronounced than before. He immediately unbuttoned his pants and furiously jerked off his aching cock.

As Grandpa Burt struck each pose, he felt a surge of pride and confidence course through him. He reveled in the attention and adoration from Gary, basking in the knowledge that he had captured his heart.

And with the final pose, he bent down, brought his arms together, and flexed the greatest most muscular pose that Gary had ever seen.

"FUCK YEAH! BIG HAIRY MUSCLE DADDY IS ALL YOURS BABY!!!"

Grandpa Burt roared as he hit the pose. And his hot muscle cum exploded out of his monster cock with great force, coating the walls and Gary. 

"OH FUCK~!", Gary yelled as he came.

Finally, Grandpa Burt stood tall, hands on hips, and surveyed his work.

Something suddenly snapped within Grandpa Burt as he grunted and gritted his teeth. 

"GRRRRRRRRRRRRR..."

"Umm... Grandpa Burt? You okay?", asked Gary as he was growing concerned.

Grandpa Burt quickly cradled Gary in bridal style to the bedroom.

"I can't seem to control myself anymore. I need to make love to you baby. I got to breed you full of my muscle cum, so that you know that you will be mine forever."

"Yes, I understand, grandpa. My hole is excited to take your beast cock. But I can't deny that I'm a little scared grandaddy"

Hearing Gary call him "grandaddy", made his cock grow even longer and harder. This also made his caring and gentle side rise to the surface of his growing alpha personality. Feeling his massive balls churning with excitement as they produced more baby batter. Pre cum leaking faster through his slit. 

"Don't worry baby. I promise you that I will be gentle with your body. I will never hurt you. I will keep you safe and only bring you pleasure. After all, this is what I believe is the main goal of my beast-like body. To love and protect you baby~." He said as he planted gentle and loving kisses all over Gary's handsome face.

To be continued in the final chapter...

[boardman]

Incredibly hot chapter

[Tjdonger]

Omg! This is one of the hottest stories in a long while. Thank you! Love muscle dads and granddads. Incest. All of it is perfect! More please!!

[Bigboi]

Chapter 3

Gary closed his eyes, reveling in the sensation of Grandpa Burt's lips on his skin. He felt a surge of desire coursing through his veins, and he knew that he wanted nothing more than to experience the fullness of his grandaddy’s massive cock inside him.

Grandpa Burt gently laid Gary on his back and positioned himself in missionary style. He preferred this position so that he could see Gary, and for Gary to see his immense and beautiful body when they make passionate love.

Before Grandpa Burt can make love to his boy, he needs to prepare Gary first to lessen the pain when Burt enters his love chute. So the old muscle beast slowly rimmed the entrance of Gary's hole with his skillful mouth and tongue. 

“You taste so good my boy, I could eat your ass all day.”

The beast loved the taste and aroma coming from his boy’s pussy, and especially the moans that Gary expressed from the intense pleasure. 

After rimming him, Burt inserted his massive finger into Gary’s pussy, continuing to expand it to accommodate the old man’s massive tool. He gently pressed his finger onto his grandson’s prostate, making Gary moan in delight and ecstasy. 

"Oooooooohhhhh fuuuuuuuck, your so good grandpa. Keep going~.", Gary moaned.

After preparing his boy, Grandpa Burt reviewed his handiwork and was pleased to see his boy's hole so stretched and throbbing with need.

"Your hole is ready for my cock, my boy."

"Hmmmmm… Please put it in now Grandpa. I need to feel your love inside me."

As Grandpa Burt positioned above Gary, he could feel the heat of his body radiating onto his own. The smell of his sweat and musk filled Gary's nostrils, driving him wild with lust.

He reached up to touch Grandpa Burt's chest, feeling the heat radiating from his skin. The sound of their breathing grew heavier, more rapid until they were both panting heavily. Grandpa Burt lowered his mouth to Gary's neck, nibbling gently at his earlobe.

"Are you ready for me, baby?" he whispered.

Gary nodded, his voice caught in his throat.

He felt a mixture of fear and excitement building within him as Grandpa Burt teased his mammoth cock right at his entrance.  But he trusted Grandpa Burt completely. He knew that if anyone could handle him, it was this big, strong man who had always been there for him.

"Let me in and breed you baby, we'll share this together."

Grandpa Burt paused for a moment, gathering himself. Then he began to push forward, trying to slowly enter Gary's body. He felt the heat surrounding him, the tightness of Gary's muscles clutching at his cock. It was unlike anything he had ever experienced before. Both Burt and Gary moaned in unison as the head of the massive meat stick popped inside the entrance of his hole.

"Ooooooooooooooooooohhhhhhhhhh"

"Ooooooooooooooooooohhhhhhhhhh"

The sheer size of Grandpa Burt's 20-inch cock stretched his ass to its limits, filling him completely. As he adjusted to the foreign sensation, Gary let out a sigh of contentment. He felt utterly secure and cherished in Grandpa Burt's embrace, surrounded by the warmth of his powerful body.

Grandpa Burt looked down at Gary, gazing into his eyes with tenderness. "You're doing great, baby," he murmured softly.

As Grandpa Burt continued to push forward, he kept his eyes locked on Gary, making sure to adjust the pressure of his invasion from Gary’s reactions. Gary noticed this as he opened his eyes, and Grandpa Burt's love immediately connected through Gary. Even when Grandpa Burt turned to this gigantic avatar of masculinity, his love and kindness still remained through that simple, yet meaningful action.

Grandpa Burt lowered his face to Gary as he softly kissed him, brushing his mustache on his lover’s face. Once Gary adjusted to their rhythm, he let his grandpa into his mouth, letting him taste every crevice. 

This allowed Gary to fully open himself up to Grandpa Burt's invading monster dick.

"Hrrrrrrrrmmmmmmmm, oh baby.", Grandpa Burt moaned as he bottomed out inside his lover.

"HAHAHAHAHA! You did so well my love. I'm so proud of you!", Grandpa Burt exclaimed 

Grandpa Burt praised Gary as he showered him with kisses all over his face.

"Oh fuck! Its so huge. I'm so full of your love grandaddy. I feel so safe and secure right now hmmmmmm~.", Gary moaned, feeling the beast cock inside his body throb and twitch with excitement. Grandpa Burt began massaging his boy's hairy and toned stomach. This allowed him to feel his cock rearranging Gary's insides, and letting him adjust to his cock’s girth. 

"You are so beautiful and handsome my baby boy. Are you sure you’re okay? Am I not hurting you, my love? 

“No grandpa, I’m alright. Just let me adjust a bit more.” 

With that, Grandpa Burt returned to making out with Gary as he kept feeling up his boy’s body. 

After a few minutes, the old muscle beast felt his son’s hole involuntarily push against his cock.

“So, can your grandaddy make love to you with his love tool, baby?"

"Yes Daddy, you make me so full. Please, make me truly yours…"

"Get ready baby boy, I'm gonna start moving. You take me in soooooo well, but I don't wanna hurt you by being too rough…"

Grandpa Burt started to slowly take out his cock, only leaving the cock head inside Gary's body.

"... so I'm gonna be gentle and delicate with your hot and sexy body. Just relax and feel my love darling boy~.", Burt said as he slowly inserted his cock inside his lover with all the passion and care he could give to him.

"Uuuuuugnh daddy. I love you so much. You are the biggest and most hung old man in the entire world."

"Yes, baby. I'm an ultra-masculine monster claiming his lovely boy.” 

As Grandpa Burt continued to grind himself deeper, Gary suddenly arched his back in ecstasy.

“Ho ho ho. It seems I found your love button again baby. Can you feel me pressing your prostate? Grrrrrrrrrrrrr" Grandpa Burt grunted

"OOOOOH FUCK. Your cock feels so gooooood inside me daddy. Its so good grinding at my prostate~"

Gary could feel every vein that covered his grandpa's massive cock every time as it gently passed through the entrance of his gaping hole.

With a sweet and caring look, Gary moaned, "And above all that alpha muscle beast, you are the most loving, and caring person in my entire life. Oh how I wished I confessed to you sooner Grandpa. All those times wasted."

Grandpa Burt snapped momentarily from his euphoric state after hearing Gary's confession. While still making gentle love to his baby he said, "You don't need to worry about that anymore darling. What's important right now is that we are together now."

Grandpa Burt rose to his knees and flexed his body as he put his hands behind his head. 

"I believe that fate decided for me to stay on this farm for me to grow into a muscle beast," he said as he continued flexing his abs.

He moved on to another pose as he continued. This time he brings his arms down to his favorite pose, the double bicep. "To grow my body into beastly proportions for you to worship..."

Side Chest, "... growing my cock into a pillar of pure muscle to bring you pleasure..."

Lat spread, "... my thick and warm fur to keep you warm and comfortable..."

Most muscular"... GRRRRRRRR my monster-like strength to keep you safe from any danger..." He flexed even harder, "Even do every heavy lifting for you..."

Grandpa Burt finished posing and went back down to wrap his arms around his lover, gently pulling him closer to his hairy muscle body. Gary tugged and caressed Burt’s manly chest and fur as he was being bred. Gary began to lick Grandpa Burt's massive hairy chest, tasting his salty yet tasty sweat. Gary occasionally sucked on the erect nipples like a baby hungry for his muscle daddy's muscle milk. Then, Grandpa Burt flexed his colossal pecs and abs, making them bigger. Gary alternately took in his lover's intoxicating alpha musk while twisting the round and hard nipples underneath the two massive pec mountains. Burt then whispered to his lover, "... Ooooooh baby boy, I’m getting close to showering you with all my pent-up love." 

Gary closed his eyes once more, preparing to receive his giant muscle daddy's love cream. He felt Grandpa Burt's love tool getting harder and bigger inside him, and the oversized balls churning with hot seed inside them. They are so close to the climax of their passionate love. Gary suddenly pitched and tugged on Granpa Burt’s sensitive nipples, twisting and pinching them. With this, Grandpa Burt kissed Gary with unbridled passion as his tongue went inside Gary's, exploring every corner and savoring the taste of his mate with heightened lust.

Grandpa Burt's act of oral and anal love, and Gary’s continued abuse of his monster Grandpa’s nipples, mixed with their passionate sex sparked a familiar feeling within Burt. He can feel his body pulsating once more, a sign of another growth spurt. Burt can manage his growing body, but he was afraid that his growing cock will tear his lover apart.

"GRRRRRRRRRRRRRRRRAAAAAAAAAGH HRRRRRRMMMMMMMMM!"

Grandpa Burt grunted as he tried to control his expanding body.

“Control yourself, old man!”

 It took a lot of willpower to transfer the growth of his cock to the rest of his growing body instead. 

The rest of Grandpa Burt's muscles grew bigger. His facial features became more masculine and exaggerated, including his growing beard. Another row of abs popped underneath the last row, giving him 10 massive bricks of cobblestone abs. Combining all these features is giving him a handsome wild beast, caveman look. 

"OOOOOOOOHHHHHHHHHH FUUUUCK BIIIIIIIIIIIGER MOOOOOOOOOORE!" Grandpa Burt roared

Hearing this, Gary opened his eyes with a look of awe and maximum lust on his face. Seeing Burt become even more muscular and more handsome, drove Gary wild. The stronger smell of Grandpa Burt's musk fueled both of them to reach their ultimate climax.

After a few more long strokes... the dam broke for the both of them.

"GRRAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHHHH!"

"OOOOOH YEEEEEEEEEEEEEEEEEEEEEES DAAAAAAAADDDDYYYYYYY!"

Both lovers roared and screamed as their cocks finally shot their loads. Gary's cum sprayed and landed across his chest, face, and on Grandpa Burt's muscles and torso. 

Grandpa Burt tensed his immense hairy body as he spewed countless hot molten cum inside his lover.  Grandpa Burt had another volcanic eruption, more intense than the previous ones. Realizing that fact that he finally made love to his beloved grandson made him cum harder and longer. He continued to make small jabs inside his lover, trying to milk every last drop from his swollen balls. His eruptions continue to increase in volume as well. Fearing he might damage the insides of his son. He quickly removed his cock from his grandson's stretched hole and sprayed his cum in the air with a mighty force. Grandpa Burt's cum flew high up in the air and came crashing from the ceiling. The cum splattered everywhere as it rained down. Their bodies are covered in hot creamy love batter. The bed is then destroyed due to the weight of the giant beast. Every piece of furniture is soaked in cum including the bed, the wardrobe, and the nightstand.

After 10 minutes of non-stop cumming, Grandpa Burt finally finished his destructive release. He quickly came down from ecstasy and checked on Gary first. 

"Are you alright son? Did I hurt you anywhere? Please answer me." He said with love and concern in his voice.

"Ohhhhhhh shit. Yeah I'm fine." Gary replied

"Thank goodness," Burt said, relieved

Grandpa Burt then looked around following the destruction of the room as it was covered in beast cum. He noticed that the floor was flooded with his sperm as well. He decided that he would just clean these tomorrow. And he looked down to see his 700 lbs cum soaked monster frame and his 23-inch beast cock. Most of the growth on his cock has equally spread onto the rest of the muscle growth.

Grandpa Burt leaned down to kiss Gary again. Shoving both of their tongues into each other's mouths. Tasting each other's cum that went to their mouths during their climax.

Grandpa Burt carefully lifted Gary from the cum soaked bed. Burt laid down and placed Gary gently on top of his massive body, acting as a king-sized bed for his lover to lie on. 

Gary got to a more comfortable spot as he caressed and explored the post-growth spurt body of Grandpa Burt. He played with Grandpa Burt's furry chest and tangled his fingers on his giant's beard.

Grandpa Burt put his giant hands carefully on top of Gary as a blanket of sorts. 

They both looked at each other. Pure love can be seen and felt by both men.

"I wish I could bring you more pleasure my daddy muscle beast, but I am so drained"

"Its alright my boy, you did incredible on our first time. Just relax and sleep, while your muscle beast keeps your body safe and warm."

"Thank you, grandpa, I promise to improve so that we can catch up on all the conversations that we missed."

"I look forward to that son. Now sleep tight and have a goodnight, baby."

"Okay... I love you Grandpa Burt"

Grandpa Burt smiled and said, "I love you too Gary, my sweet baby boy."

The muscle giant and his grandson drifted to sleep, happy and content knowing that this was just the start of a new and happy relationship.

THE END