Fired up Evolution
So this story is based on a wonderful animation by h0rs3, no further explanation there. I love his content, so I figured I had to make one of his animations into a story at some point and this is the one I chose.
Enjoy!
e621 dot net/posts/1808244
It was a bright and sunny day and Growlithe had just gotten out of the shower of his one-bedroom apartment, he did run a towel along his body but his fire-orange and black stiped fur was still considerably moist. Also, said fur was the only thing that he was wearing in that moment, a very common occurrence for the Anthromorphic puppy when he is alone, having no roommates made this especially easy.
Growlithe was looking into the mirror and admiring his form. He did exercise regularly so his body was slim with a few muscles poking through his fur, but in the back of his mind Growlithe had always desired to be…bigger.
Growlithe was about to go slip some clothes on so he could go out to run some errands for the day, when he hears a knock on the door followed by the sound of something being lowered to the doorstep.
Still fully naked and looking through his peephole, Growlithe saw an Anthro Delibird flying off, which is a telltale sign that Growlithe got something. He opens the door just enough to see his doorstep and, sure enough, there was a brown package sitting on said doorstep.
Curiosity hitting him, Growlithe picks up the box and closes the door as, again, he was still naked. He inspects the box and finds that it isn't quite heavy, which left him wondering what was inside.
Using a claw to cut the masking tape at the top of the box, Gowlithe opens it up and his eyes widen more than a Gengar as he realizes what it is. Inside the box was a yellow stone that had a red fire symbol in the center.
Growlithe was excited as he had been waiting for this Fire Stone to arrive for quite some time, Fire Stones are very hard to come by in his area so he had to order one online, and as Growlithe had seen what stones like these had done to some of his friends, he was more than excited.
Growlithe reaches into the box and picks up the Fire Stone and as soon as it got into his paw, the stone lights up with a faint yellow light which sent a surge through Growlithe's body, the shock of which made him drop the stone back into the box.
Looking down, Growlithe didn't see that much had changed apart from the his black cock had slipped out of his sheath and was in its flaccid state, but it usually gets that way on hot days like this.
One thing that Growlithe did note is that the surge that the Fire Stone gave him felt quite good, so he picks the stone back up with his left paw and as soon as the stone leaves the box, it shines again, making Growlithe grow at least four inches taller and his cock perked up a bit from the fiery energy that surged through him.
Growlithe reaches up to feel that his pointed, fuzzy ears had gotten twice as long. He also couldn't help but look down and notice that his neck was sprouting half of a sandy-colored, furry mane that matched the color of his chest, stomach and tail fur.
However, Growlithe knew he wanted, no, he needed more, so he looks back down to the Fire Stone and it shines again, sending another strong surge of energy that not only felt amazing but made him grow another six inches in height and his now-erect cock grew half that, both in length and girth. His knees push the table the box sat on out a bit.
Growlithe looks down and sees that his tail had gotten bushier, longer and softer, he just had to bring his tail up to feel how big and soft it was, knocking over the box in the process.
His whole body was now packed with muscles that poked right though his now-black torso fur, orange and black striped arms and legs, and the fur around his balls had gone black as well.
It was official, Growlithe had evolved into an Arcanine.
But Arcanine knew that this was not it, in fact Arcanine's mind and body begged for even more as the growth just felt that good, so he looks back down to the stone and it shines, sending another surge of growth energy that really fired up Arcanine's insides and made him feel even better as he grew another six inches! The table in front of him split in half and flipped to the other side of the room from his sudden growth.
It felt so good that Arcanine just ended up tossing the Fire Stone right out of his hand in a random direction, but the work it had done was certainly enough…for now.
Looking down, Arcanine marveled at his now packed muscles, he decided to flex his left bicep to see that it was now as big as his hand when he was still a Growlithe, his once five foot form had easily gone up to about 7 feet, and he loved all the new fur around his mane and tail. Running his tongue along the edge of his mouth, Arcanine found that he had also grown a nice set of fangs at the top front and bottom sides of his jaw.
But of course, his muscles and fur weren't the only thing that got bigger. Looking down, Arcanine saw that his black cock was now long enough to reach past his chest and was about as thick as a baseball bat.
Not only that, but his balls had gone from modest kiwi size to the size of whole pomegranates, the sight alone made him much hornier than normal, so of course he had to take matters into his own paws. His now-heightened sense of smell also caught a very strong whiff of the sweaty musk that those balls were letting off, which made him even harder.
Arcanine rubs the upper side of his cock with is meaty paw, which alone made him drizzle about 3 ounces of pre-cum from how horny and hot he felt, plus from how full his fat balls must be, so he couldn't wait to just jump right into it.
And the fact that he was drizzling pre-cum so quickly didn't even surprise him, the growth from the evolution filled Arcanine's body with tons of hot, fiery energy that ran through his whole body and made his cock twitch.
He grips the cock and finds just how girthy it really is, he couldn't even wrap his fingers around the cock it was so thick, and finds it to be long enough that he really does need both paws to get things going as Arcanine puts his left paw at the base of the meat pole and his right along the mid-section as he starts stroking his mighty cock, the hot feeling of which made him start panting.
Arcanine continues to stroke his huge cock, the pleasure of which was like nothing else he'd ever experienced. As a Growlithe, Arcanine's cock was a fairly reasonable size, slightly larger than the average human, but now that he could see the tip of his hard cock just by glancing down, it made him hornier than ever.
Another thing that Arcanine had to wrap his head around was how much heat was flowing through is veins, heat that could burn a human by just touching too deep into his fur. His long, bushy tail wags to the beat of his stroking as it just felt that good to have all this power, this raw energy flowing through his body.
In the back of his mind, Arcanine wasn't even sure what his friends were going to do with him once they see him like this rather than his smaller Growlithe form, most likely they'd have him show off these new muscles of his. He'd likely need to get a whole new wardrobe as nothing he owns will fit around his huge muscles, much less the fifteen inch long, 6 inch thick member that he was currently stroking.
The power he felt and the heat rising in him led his cock to start drizzling pre-cum like a broken faucet, and Arcanine couldn't blame it as neither he nor his cock were used to being so large, so powerful, so hot.
Speaking of which, the heat that was building up as Arcanine was masturbating had gotten so hot that you could probably crack an egg onto his cock and it would fry in seconds, and he knew very well that this heat would soon come rushing out of him what is expected to be the hottest, most intense orgasm he will soon experience.
It didn't help that his very large muscles allowed him to stroke his cock even harder and faster than ever before, which only seemed to make things worse as his pleasure and heat builds up.
It only took minutes before Arcanine's huge, black furred balls tense up and his cock begins to fire huge, ropey strands of hot cum, the first shot of which was fired with such a force that it went all the way to the other side of the living room and arched up to the ceiling, and that was just one shot of hot cum.
This was followed by smaller but just-as hot shots that splattered around the room, hitting the table he flipped over, the floor, the wall, the tv stand, and just about anything his cock could shoot on, all the while Arcanine continue to pump the sensitive flesh pole and encourage even more cum to be released as it just felt that good.
Of course Arcanine was going to have to clean all of this up later, but in that moment he just didn't care. In fact, Arcanine wanted to see just HOW messy he could make the room, so he starts moving his cock around to spray cum wherever he could, marking, no, saturating the room with his musky scent that would no doubt linger for a week or two.
One shot of cum was so intense, in fact, it made Arcanine lift his right leg up and made his cock point up to where it splattered cum onto the ceiling as well. That felt good enough that Arcanine then wraps both paws around his cock, and he really did need to put both paws together to do so, and starts thrusting his hips into his hands like his hands were someone's ass.
As he was doing this, Arcanine briefly wondered just who would be able to take such a large cock without splitting in half, but then he remembered he has a Lucario friend that's taken a Rapidash with little issue so he might have to ask him later.
For now, Arcanine kept thrusting into his circled paws and spraying strand after strand of hot semen which felt so good that he ended up losing balance and flops down to the floor, smashing into the cabinets that hang next to his front door in the process, something he made a mental note to look at later.
Arcanine pauses for a moment to take note of the fact that not only was his cock still drizzling cum, but the tip was now on level with his nose, which did give him ideas for something he's always wanted to try but will have to do so later.
Arcanine almost became hypnotized by how large his cock had become, he gives it a few more strokes to get every last drop of cum out of his balls, but then he moves his cock to the side as he sees the mess he had made. There was hardly a surface in front of him that wasn't coated in hot, musky Growlithe batter that all came from his large balls, and he couldn't be prouder.
That's when he spots the Fire Stone which seemed to have ended up under his black sofa and did let off a small shine. Thinking that the stone may have a bit more to it, Arcanine gets on all-fours and crawls across the cum stained floor to the stone and picks it up.
Sure enough, as soon as the Fire Stone was in his hand, it flashed yellow once more and Arcanine felt one last surge of fiery energy flow through him, making him grow another six inches in height, making his head only six inches below the ceiling when sitting on his knees, and his cock grew by another four inches, and his balls grew to the size of large coconuts, his cock letting off another shot of hot cum that splattered the wall in front of him.
The orange husky then gets on his hands and knees again as his cock fires one last hot, very intense shot of cum that splattered on the TV stand and TV itself. Once that was done, Arcanine sits there panting like he just ran a marathon, staring down to his black cock tip which was still drizzling cum onto the floor.
Not being able to help himself, Arcanine lowers his head and runs his tongue from a few inches past his own fat cock tip all the way up to the urethral opening, finding that he especially loves the salty, musky, spicy taste of his own cock.
He then raises his head and places his left paw on his cock once again to continue rubbing the hot flesh rod and make it drizzle even more cum, panting all the while as the most intense orgasm of his life settles down.
Did Arcanine have a huge mess of cum to clean up? Yes. Will he have to replace some of his furniture? Yes. Will he need to buy a new wardrobe to fit this new massive, muscular body of his? Yes. Would he change a single thing? Absolutely not.
Thank you for reading this story, I really hope you enjoyed it and if you did then please let me know.
Take care and I'll see you later!