In the middle of a patch of woods, a trio of pups were clad in boy scout uniforms of khaki shorts, green short sleeved buttoned-down shirts, red bandanas around their necks, backpacks, brown sashes with plenty of badges, and topped with green caps. The group were on their way towards a rendezvous site with a green tent and flag where a head camp counselor gives them their expedition badge.
Leading the way was Roni the border collie while holding a map in one hand and a compass in the other. Following him was a black and brown furred Doberman pup named Dustin and tailing at the end was a grey black spotted dalmatian named Denny that drank from a canteen of water occasionally. 
“Okay, guys. Just another half mile and we’ll be there soon.” Roni said.
“Finally, I’m getting hungry!” Dustin said.
“I just want to take a shower and sleep. It’s way too hot!” Denny complained while taking a sip from his canteen.
“As long as we don’t take too many breaks, we’ll get there in no ti- Oof!” 
Roni tripped over something jutting from the ground, dropping the map and compass in the process. His teammates came to his aid and helped him up. Then, they looked over where he tripped, seeing what it was. Upon closer inspection, there was something hidden in the ground covered in dirt. 
After dusting it, they discovered a square wooden hatch door closed with a metal latch. After unlatching the hatch, they opened door to reveal a shaft with a ladder embedded onto the side, leading deep down into the darkness. Roni took out a flashlight from his backpack and shone down the hatch, but even the light couldn’t reach the bottom of the chute. 
“Wow, wonder where it leads. Wanna go in, and see?” Dustin piped up with curious eagerness.
“What? No! We should just keep going to the site. I don’t want to get in trouble.” Denny interjected.
Roni was very curious to see where the hatch leads to but like Denny not wanting to get in trouble with the councilors.
“Let’s finish up the assignment and come back later after dark when everybody’s asleep. Sound fair?” Roni finally decided.
They all agreed, though Denny thought it was scarier and worse doing it at night. But there was no going back on it now. They put a marker on the hatch to identify its location when they come back for it. After completing their task and later when the camp activities were finished by nightfall, it was lights out for all the cabins. 
Around midnight the trio of pups changed out of their pjs and into their uniforms and snuck out with flashlights in hand. They avoided the patrolling camp counselors and went into the woods towards the hatch they found which had a different creepier atmosphere than during the day. When they arrived, they opened the hatch and beamed their flashlights down into the abyss, illuminating the side ladder yet still not reaching the bottom. The three friends were uneasy, but they were this far into it and curiosity won most of them over. Though they debated on who was daring enough to go down first.
“I’ll go first.” Roni volunteered. 
He looked down into the abyss with his flashlight hesitantly for a moment with an audible gulp and began to nervously descend on the side wooden ladder, almost slipping at first. Dustin followed with Denny coming down last. The climb down took a while, around thirty minutes before they reached the bottom of the ladder. 
Aiming their flashlights and looking around, the boys found themselves in some kind of tunnel that was ten feet tall and wide. The trio went down the path together, pointing at beams of light any which way, checking their surroundings as they went forward. 
After a while of traveling, they came across a large area where in the center of the room was a large pink crystal, jutting out of the ground almost reaching the ceiling. It somehow shone a bit, emitting some light that lit up the area surrounding it. The pup trio stared up in awe at their discovery as they got closer to examining it. 
Like moths to a flame, they were drawn to the crystal’s glow, feeling a strange warmth emanating from it. Wordlessly, in their trancelike state, they touched the crystal and were simultaneously hit by a wave of energy that coursed throughout their bodies. After receiving a great dose of it, they were repelled backwards onto the ground, writhing, and groaning in slight discomfort and somewhat pleasure. 
Roni saw his two friends begin to change as their bodies grow taller and mature with bones cracking, joints popping and clothes stretching and tearing. Their groans became deeper in pitch in the process as their muscles developed into adulthood. He felt his body follow suit but with an unexpected twist.
As he lay on the floor feeling a multitude of sensations, his feet cracked as they grew a few inches but with dainty toes. His legs matured and elongated into shapely feminine ones with thicker thighs and toned calves, adding about a foot to his overall height.
He grunted as his waist shrunk while his hips flared into childbearing proportions. His butt bloated a few layers of fat along with his tail extending and elongating. All of this resulted in his shorts and underwear bursting and being destroyed in the process, leaving him bare bottom.
He moaned as he felt his furred sac and penis recede into his body, only to be replaced with a plump and puffy mature pussy. 
Again, he moaned as he felt pressure in his chest. His torso aged and widened a bit while his dark nipples stiffened, and areolas became puffier. His chest grew and ballooned into near FF size tits, bursting forth as his shirt exploded into tiny pieces. 
His arms, like his legs, grew and extended while his hands grew and became daintier with long thin fingers with long nails. 
Finally, he felt the changes and sensations come to his head and face. His head aged as his muzzle grew longer and narrow like many females and his eyelashes extended as well. His ears grew and became slightly fluffier. From his scalp, long curly hair grew and flowed down his back until it stopped at the tail base.
The boy pup was now a full-grown female dog.
“Wha hap-?!” Roni paused at the sound of her higher pitched voice.
She sat up and looked down at her body, feeling much of her new curvy body. She gave her massive melons a squeeze, causing feminine moan to escape her muzzle. Then, curious fingers explored newfound depths as they rubbed against her inner walls, eliciting more moans, and causing her body to shudder.
“Whoa! I’m big!” said a deep gruff voice.
Her attention turned towards the naked rottweiler Dustin who was admiring his older muscular body. Roni was admiring his new body builder physique as well, but most notably his unsheathed nearly foot long cock, causing her crotch to feel hot and wet.
“T-this feels weird.” said another deep voice yet not as gruff.
She turned towards the dalmatian Denny who was muscular but with more of a runner’s build, slightly on the lean side. Again, her eyes were on his almost foot long red rocket, making her mouth and crotch drool again. Female hormones were in full force as her body yearned for them, but she shook her head of hazy thoughts. Then, the two adult male dogs turned towards their friend now a grown naked female, staring and blushing at her beautiful curvy body with boners throbbing in need.
“Wow, Roni, you…you um look pretty.” Denny stammered, still blushing while his eyes darted to the side as not to be rude.
“Yeah, you look hot…” Dustin stated as he ogled her with cock in hand.
“N-no! G-guys, we should try to change back!” Roni pleaded even though her hormones were growing and resistance waning as her body wanted the hot males in front of her as her pussy leaked juices. 
Behind her, the crystal began to softly glow again, emitting a bit more energy to the trio, increasing their libido with genitals leaking more pre. 
“Can we just…have some fun with these bodies first?” the rottweiler said, almost trance like, as he went over to Roni, coming towards her and kneeling next to her.
“W-wait…I-…Mmmph.” 
Roni couldn’t avoid his advances nor was able to resist anymore as their muzzles connected into one long steamy kiss as their tongues entangled. Then, Dustin laid on top of her as they continued to kiss, lying on the ground with Denny watching the sexy scene unfold while stroking his cock.
As they continued kissing on the ground, their genitals grinded as his shaft rubbed up against her entryway. Roni moaned at the sensation of it along with Dustin’s sudden groping of her boobs, kneading them like dough. 
“Oooh~! D-Dustin, p-put it in me! Please!” she cried as her body yearned for his meaty rod.
He complied with a grunt and a deep thrust as his bone buried into her, causing another loud moan to escape her doggy lips. He pumped in and out of her steadily at first as his dick massaged her flesh tunnels. More moaning resulted as the sex and foreplay of tit groping and kissing followed. 
Then, the rottweiler quickened his pace, causing Roni to hold onto him and wrap his legs around his waist for stability. More foreplay and kissing followed again as pressure begin to build within the two. Soon, Roni’s pussy pulsated in unison with his throbbing penis as they reached towards the climax.
“Ooooh~haah….Aah! Oh…Oh D-Dustin…I-haah-I’m! Cumming!” she cried out as her pussy drenched his dick with a deluge of cum. 
“Ungh…~! Oooh….haah…Me-aah! Too!” Dustin followed as his red rocket blasted baby batter into her womb, filling it up.
The two panted as they finished unleashing their load. Dustin exited her with a wet plop as seed and cum leaked out. The rottweiler was clearly spent as he was now out like a light, snoozing. Despite on the ground resting, Roni however was still awake and seemed raring to go again with her legs spread apart, showing off a leaky snatch. She looked over towards Denny who still stood watch with dick in hand as if in a trance, edging a bit. 
“Denny…haah…please…P-put your dick in me! I want it!” she exclaimed as her pussy still itching for more as she switched to a doggy style position on all fours.
Wordlessly, the dalmatian didn’t hesitate as he went up behind her and aligned his rod towards her entryway. With a simple thrust, he was in, resulting in a sharp gasp followed by a long moan. He pumped in and out of her slowly at first with moans and grunts of his own. Then, he sped up the pace as his apple sized testes slapped against her thighs, rocking her body as her tits flop to and fro with the rhythm of sex. It wasn’t long until climax came to both. Denny unleashed his load into her, flooding her womb with even more semen to the point of expanding her stomach, making her look about a couple weeks pregnant. Roni moaned loud as she came onto his cock with a mix of bodily fluids. 
Exhausted, the pair lied down with Denny still inside of her, knot and all, as he held onto her. Soon, all three dogs were now asleep. However, the crystal wasn’t done yet as it let out another soft pink glow, solely targeting Roni. She groaned and tossed a bit in discomfort as her abdomen expanded as the twins in her womb grew along with her tits gaining another cup filled with milk. It wasn’t long until she looked about 8-9 months pregnant with a beachball sized belly. 

Roughly few hours later…

“*Yawn…*groans…Mmmm…hmm..?” Roni groggily woke up before her other friends.
As her vision came to, she was greeted to the sight of large milky melons and a big baby bump on her belly. Her eyes went wide and let out a yelp, waking the other two.
“Sweet Anubis!”
“Huh…?” 
“Wha…”
When they fully awoke, they looked over to their fellow camper in shock at her new pregnancy. 
“Roni, what happened!” Dustin asked.
“Are you okay?” Denny said with concern.
“I don’t know! Must’ve been that crystal! I’m fine, but I feel…stra-Oooh~! Ahh! *Pssshh!” 
Roni was interrupted by movement within her womb along with her water breaking.
“O-Oh Dog! The babies are…Ugh! Coming!” she exclaimed with her legs spread eagle as she felt more contractions coming. Her two companions began to panic, looking at each other.
“Wh-what do we do?” Dustin asked.
“Someone….Aggh! Needs to catch them…haah….when they come out! Ungh!” Roni cried out midway through another contraction.
“I’ll get the babies.” Denny said as he got into position facing her winking pussy.
“W-what do I do?” Dustin asked again quizzically. 
“Ungh~! Gather…haah…parts of our clothes. Use them to wrap them- Argh!” Roni struggled to get out as she pushed hard. Dustin did as he was told without hesitation.
“I see the head!” Denny exclaimed as the first baby was steadily on its way out. 
After more grunting and pushing from Roni, the baby was finally out with an umbilical cord attached. It was a dalmatian female pup with grey coat and black and white spots.
“G-give her to me!” Roni pleaded.
He obeyed as he handed her their newborn daughter. Motherly instincts and hormones kicked in as Roni gave her a tongue bath and bit off the umbilical cord. As if on cue, Dustin came over with tattered shirts formed into a makeshift wrap for the pup to put her in and held onto her as Roni wasn’t done delivering yet.
With deep heavy pants and grunts as tears streamed down her face and fingers clenched into the dirt ground, she pushed hard until the last baby was finally out. Denny caught the next newborn, a male black and brown border collie mixed pup. He handed him over to Roni who immediately snipped off the umbilical cord and gave him a tongue bath like with his sister before. Then, Dustin wrapped him up in the remaining tattered clothes that he gathered.
“P-please give them here!” she said as more instincts took hold.
He complied as handed the babies over to her. She then brought them up to her breasts so they can nurse, suckling each tit, while she cradled and hushed them. The two males stared at the motherly display as the babies calmed into a sleep.
“So um…What do we do now?” Dustin asked, scratching the back of his head.
“No choice but to head back to camp. I know we aren’t boys anymore, esp. me.” Roni stated. “But I’m not staying here if that crystal is going to act up again and do something else to us.”
They all agreed, and it was settled that they went back to camp after Roni rested and recovered a bit from childbirth. Soon with babies in tow, they backtracked down the tunnel towards the ladder they climbed down on. They had to be careful climbing up with their new bundles of joy, so Denny took her daughter and Dustin took his son as they ascended so Roni could climb.
Once out of the hatch, they were greeted by the blinding morning rays of the sun. The two males gave the babies back to their mom as they were getting restless and in need of milk. The naked trio traveled through the forest back to camp.
When they arrived, they hid behind some bushes as the camp seemed to have erupted with some commotion as a couple of cop cars were on the scene next to the main camp office and the center flagpole. Two policemen were talking to some counselors while others were trying to keep all the other kids preoccupied. They seemed to have caused more trouble than they realized by sneaking off last night and it made them hesitate to return out of slight fright. But they all made their decision and revealed themselves to hopefully defuse the situation.
Things seemed to grind to a halt as the people at camp saw three naked grown dogs, two males and a female carrying a couple of babies, coming out of the forest. Many had shocked and surprised expressions while some of the counselors tried to cover the eyes of innocent campers.
“Who are you and where did you come from?” said the scoutmaster, a saint Bernard in tan khaki shirt and shorts. “Explain yourselves.”
“Yeah…um it’s a very long story.” Roni replied with a nervous smile.

The End