It was warm sunny day at the local dog park where Shaggy usually take Scooby for a walk. It was mostly a grass clearing with patches of woods and bushes surrounding it. Pathways that branch out with benches parallel to them were plenty here. Many dog owners come here to relax, chat, play with their pooches and sometimes get dates. A variety of dogs from breeds to sizes to personalities come together to make a complex canine community. 
Scooby does have fun with the other dogs, sometimes act like a canine Casanova to the females. Only to find out that they are already taken or just to be rejected. At this time, Shaggy was busy getting food from the occasional food vender that served hotdogs, hamburgers, etc. and he would eat most of it, only to sleep on a nearby bench afterward. 

Scooby then went over to the snoozing Shaggy and ate the remainder of his huge feast that had been set aside. His nose then picked up a strange scent coming from some bushes nearby behind the bench between a couple of trees. It was a perfume like scent, like the lavender stuff Daphne sometimes uses. His snout sniffed out the source of the smell as he stuck his head through the small leaves and branches of the bushes. Quickly he poked his head in and picked up the object with his mouth, dropping it in front of him. 
The object he discovered was a pink tennis ball. Strange for such an object to give off an odor and it looked brand new. Scooby felt a strange hypnotic attachment to it as he began gnawing at it with squeaks attached to every chew. While he continued chewing, the ball gradually glowed brighter and brighter while he was still entranced.
Soon, the glow started to engulf the dog and with a flash, and he was gone without a trace. Scooby blacked out for a moment during the flash and had gotten out of his mesmerizing state. When he came to, he then realized he was now in a different place.
Water! Water everywhere! 
He was completely submerged yet floating slightly in a vast blue ocean with sandy ground just a few feet below covered with coral reefs, shells, and other natural deep-sea constructs along with various aquatic life.  
In a panic, he almost screamed but stopped himself due to releasing the air he was holding in and that he still held the tennis ball in his mouth. He tried to doggy paddle to the surface but didn’t make any progress as he still sunk to the bottom. To make matters worse, he felt like he was going to blackout holding in the only supply of air and the need to exhale. As his vision darkened, something odd began to happen.
The tennis ball in his mouth started to go soft and began to dissolve into the water, tinting it slightly pink. Startled, Scooby let out a gasp, incidentally exhaled but also breathed and gulped in the pink fluid. A lingering taste of cherries hung on his tongue as it slid down his throat. As he struggled to breathe, he felt his neck tingle and split open on each side.
“*GAAAASP!” 
Scooby started to breathe again! But how? His fore paw reached to his neck to feel flaps on each side that filtered out the water for oxygen.
“Rills?!” he exclaimed after noticing the fishy feature, catching himself in a wave of panic.  
But the changes didn’t stop there as he felt a tingling envelope his body. 
His forepaws cracked and popped as the digits lengthened into dainty humanoid five fingered hands with long black claw nails. Skin like webbing like an otter formed between the fingers. His forelegs followed suit as they became slender humanlike arms. His hindlegs were the next to change as they inverted into slim human legs and his hind paws stretched into five toed plantigrade feet with black claws. And like his new fingers, webbing developed between his toes too.
More cracking and popping as he began to develop a pelvis region with childbearing hips and a thinned waistline, creating a curvy figure. His sheath began to shrink until a fleshy slit took its place as his penis and testicles receded into his body. His butt bloated as his tail lengthened and thickened and even morphed until it looked like a shark’s tail but brown with a black spot on it.
His torso broadened and developed human like chest cavity. Two dark puffy and perked nipples protruded from his fur as FF sized breasts bloated beneath them. His muzzle cracked as it took a more feminine look, narrowing with a smaller nose and eyelashes. Finally, he felt an itchiness in his scalp as long flowing auburn hair grew down just above the waist. 
She was now some kind of humanoid canine fish creature! And female to boot!
“What happened to me?!” she yelled out loud, scaring away some nearby fishes. “My voice!” she added as she placed a hand to her throat, realizing how high pitched it was as well as the loss of her speech impediment. 
Still in a state of shock, she looked upwards towards the surface and began to swim. Like a bullet, she darted through the water, using her tail instinctively to propel herself upwards. The burst of swim speed shocked her as she breeched the surface within a minute. Breaking through and with a gasp, she spat out some water while coughed and sputtered, having trouble breathing for a moment until her gills naturally closed on reflex. 
She felt the sun beat down on her and the ocean air that blew through her hair. Checking her surroundings, however, all she could was seawater in every direction. Not even a sign of an island in the distance nor any kind of familiar land or rock formations. Dissuaded to even try looking further and with a sigh of defeat, she ducked back below the surface, floating back down to where she was before and sat on smooth trapezoid shaped rock, pondering. 
‘Now what to do?’ 
That question lingered in her mind for a long time as the shellfish scuttled on by. Speaking of fish, she had noticed how some of the aquatic life looked very alien. Sure, she wasn’t knowledgeable about sea creatures but knew well enough that starfish weren’t usually colored gray and made of stone with kelp tendrils sticking out or purple colored crabs with uneven claw sizes covered in pink coral blemishes or fish with ruby colored scales and see through like crystal.
Which ocean was she in? Is she still even on earth for that matter? What even is she? A Dog/fish/human hybrid? A mermaid? Or merdog in this situation? 
She looked down at her large tits and grew a bit curious.  She gave them a good squeeze, feeling a greater sensitivity than before.
“OOOoooooh!” she let out a moan as she leaned back while pinching a nipple.
Then, she guided her fingers down to her crotch and inserted into her genital grotto, slowly massaging the fleshy inner walls.
“Ooooooh~Mmph! Aaaa~h!” she moaned as she leaned back again with her tail swishing in the water. It wasn’t long until she came with a current of cum.
“Haah…haah…” she panted after her first orgasm. ‘Man, I didn’t know females were this sensitive! It…it feels so…so good!’
After reeling from her experience, she rested for a while before deciding to take off and wander the blue salty yonder.
She swam through a multicolored kelp and seaweed forest, clusters of coral reefs, and gorges, getting used to her new form and surroundings. She even encountered more unusual beasts including…
‘Plesiosaurs?!’ she inwardly exclaimed as she passed by a herd of colorful Loch Ness like creatures, some the size of one-story houses; others the size of battle cruisers. Fortunately, they didn’t mind her presence and ignored the mermutt, not thinking of her as much of a threat nor as a filling snack. She traveled with them for a bit until the herd swam above a sea valley clearing, where it was nearly all sand save for a few coral reefs. But what occupied in that wide space captivated her in awe.
“Wow…” 
There stood what looked like a massive city encased within a giant glass dome, looking like a snow globe. Teal blue, seafoam green buildings made from stone or marble material with golden outlines and decorum. One huge castle structure stood taller than the smaller ones, houses and stores most likely. And was that a forest area of lush trees and greens and even farmlands too? She can see some figures in the distance walking and interacting with each other. 
Wanting to get a closer look, she dived towards the base of the dome, descending towards the sand floor. As she landed, she got a good look at the inhabitants inside. She was taken aback by what she discovered. 
‘They’re…they’re like me!’ she internally exclaimed as she saw mermutts, with familiar breeds from Afghans to Vizslas, walking around, doing casual things, shopping, chatting and manning vendors, etc. More surprising was how much it was a nudist colony with everyone in their birthday suits with genitalia hanging out. 
After being in awe of the scenery for a bit, a question came to mind.
How was she going to get in with this dome in the way? There doesn’t seem to be any visible entrances from what she could gather. She curiously touched the dome’s glass surface and immediately retracted in shock at how it rippled and how soft and malleable when her hand made contact to the surface.
The ‘glass’ wasn’t glass at all! It was a giant bubble! Will it pop if she tried to go through?
‘Well, only one way to find out.’ she thought to herself as she mustered up the courage to enter the city. 
She pressed her hand up against the dome again and pushed in slowly, putting a dent into it. As she pressed further in, she became shocked at how nearly her entire arm went through, feeling the dryness and air on the other side with the bubble dome still intact. 
Soon, she followed through with the rest of her body into the city. After a quick gasp and closing of the gills, her airbreathing came back. Yet the city was a breathless sight to behold as she took in the colorful surroundings once again. Her entrance caught the glances of some of the citizens for just a moment before getting back to their own business. Merdogs or tourists from other territories weren’t that uncommon. 
She began to traverse the aqua mosaic tiled streets, taking in her surroundings a bit more. Tall articulate buildings and houses were colored with a mixture of aquamarines, seafoam greens and golds. Her nose took up the delicious scent from nearby food stands, selling local seafoods from skewered multicolored fish to deep fried squid to broiled aquatic alien animals. It was enough to make her drool a bit. 
The glints and sparkles of nearby jewelry with necklaces adorned with aquatic turquoise gems and shells. She was drawn to them, thinking how pretty they were especially when worn on her. Her mind seemed to slowly match with her body. 
It was more apparent when she eyed some male specimens, gazing at their muscular bods and staring at their near apple sized testes. Just the mere sight of them made her slightly wet and wagged her tail but she tried to shake her mind of such thoughts. Some comments and stares from males passing by weren’t helping much either.
She headed towards the center of the market square where a large marble stone water fountain with a statue of a busty female Brittany merdog that poured a clay water jug. Behind that were three large set of stairs that lead towards the imposing castle that she had seen earlier and a large golden statue of what looked like muscular German Shepherd merdog, looking bold and heroic as he wielded a trident that pointed upward with a cape that flowed perpetually and donned a jeweled crown on his head. Surprisingly was how anatomically correct it was with a large sheath hanging that made her blush a bit. Judging by the look of things, he might be the ruler of this place like a canine Aquaman. 
She sat on the edge of the fountain pool, thinking to herself on her next course of action. Despite it being underwater, it was getting late in the afternoon judging by the sun’s position. Her stomach started rumbling and realized she had no money from seeing the transactions done in the market with gold, copper and silver coins that had shells, tridents, and head of the German Shepherd statue. Staring down at her large breasts, a thought came to mind on how make money in a lewd manner, but she shook her head of such ideas.
While lost in her thoughts, a canine shaped shadow casted upon her, getting her attention. 
Stood in front of her was a German Shepherd merdog with tannish brown fur that covered most of his body, but a darker brown fur masked his muzzle and head and down his back to his shark like tail though hidden by his red cape. He donned a crown on his head and wielded a trident like the statue. He was also accompanied by a couple of golden armored merdogs, one a rottweiler and the other a Doberman. She did a double take to him and to the statue behind her. Could this be the city’s ruler?
“Hello, Atlas, your majesty!” said a passing by female Labrador with an ashy yellow coat who held a flower basket. She did a little curtsy bow and went along her way. 
“Good to see you to, Allura.” He greeted before turning his attention back towards the female Great Dane. 
“Hello, there! It’s nice to meet a new lovely face in our lovely city Nautica. You’re new to this place, aren’t you?”
“Y-yeah…”
“As you have heard, I’m Atlas, the ruler of this fine kingdom. May I ask your name?”
“Oh um, S-Scooby. Nice to…meet you, your majesty.” Scooby replied nervously while getting up. Her face grew hot and red, being in the presence of royalty and developing more of an attraction to the king due to an influx of female hormones and his handsomeness and muscular frame, and his sea salty musky scent. His guards were good looking as well, donning bodybuilder bods and large set of testes. Her pussy then dampened.
“Don’t worry about formalities, my dear. So, what part of the ocean do you hail from?” he asked.
“Well, it’s really a long story and- *stomach growls…Oh!” she stopped, putting a hand on her stomach.
“Hungry, are we? There are a lot of places for a quick bite and I would love to give you a tour of our lovely city.”
“O-oh, you don’t have to do that. I…I don’t want to be a bother to you.”
“Oh nonsense! I’ve already done my kingly duties for the day. I have plenty of time. So, what part of Aquariana are you visiting from?” he asked, saying a term that hinted on what planet she was now on.
“Very…. very far away…*Sigh. You see it’s a long story which I don’t think you’re going to believe.” She replied hesitantly.
“Oh? Sounds like an interesting story though. Maybe you can share it over a meal. I’ll show you one of our finest cafes. It’ll be my treat!”
Soon, the two were seated at a round glass table with a golden leg or stem while on an outside patio of a cerulean café building underneath a large gold canopy. They ate fruit filled pastries and were sipping warm drinks, an herbal tea that tasted bittersweet, from marble mugs while the king’s two bodyguards kept watch and well…guard as Scooby told her story. 
“A tennis…ball? Transformed? Fascinating. That is quite a remarkable tale!” He commented when her story was all said and done. 
“So…do you really believe me?” her ears drooped slightly.
“I don’t see why I wouldn’t believe you, as farfetched as it may sound. But I don’t see why you need to lie either.” He said.
“Just wondering, do you have any way of helping me? I mean, getting me back to normal and my home world?” she asked.  
“Sorry, my dear. I have no idea how to get you back nor change you back.” He replied. “But I assure you that we’ll make you feel at home in this city and be well acquainted with it.”
After finishing their drinks and food, they continued the tour as the king showed her much of the locations along with the culture, customs and livelihood of the place exploring the markets and other stores and services. They took a stroll in a park with winding paths around a large garden where unusual exotic colorful sea like flora and trees grew. Scooby shared more stories about her home world while Atlas listened attentively to her, fascinated about her life and the world where she came from. And of course, vice versa as he told her his past exploits. They were enjoying each other’s company quite a bit while many onlookers were pretty interested and curious, thinking that they might be a possible item. And all the while as feminine hormones steadily increased within her, making her mind match her body even more so.
So far it felt like half a learning experience and half a couple’s first date. 
Soon, the sun set completely pass the underwater horizon and the guarded pair were back in front of the fountain again.
“Thanks for the tour, Atlas. It was rather lovely.”
“Oh, it was nothing. But there’s still one place I want to show you, my home.” He said gestured towards his castle that was now lit up in lights along with the statue that was in front on the stairway. “And I’ll let you stay the night as well.”
“R-really? You…you really didn’t have to do that.”
“Why of course! Besides, you said it yourself that you didn’t have anywhere else to go. And I wouldn’t mind the company.” He said as he gotten close to her, embracing her with his hands on her hips as their bodies nearly pressed against each other. Her face blushed at the approach but didn’t resist, feeling a stronger sense of attraction building within. 
“O-okay. The tour continues I guess.” She said.
“Splendid! Let’s start with the kitchen and dining room. It’s close to dinner time after all.” He said, guiding her to his castle abode.
They passed the imposing golden statue up the stairs and went through two golden doors that opened up to a large manor like foyer with fine brandished wood with aquatic colored teal and seafoam green walls and carpets with small tables and stands with decorative ceramic urns. On some walls hung pictures of Atlas and his royal family line. A couple of female merdog poodles, one white furred while the other black, in stylized aprons with large D cups. Maids if she were to guess. 
“Welcome home, your majesty.” Said the white one.
“Have a new guest, I see. We welcome you too!” Said the black one with a bow.
“Good to see you to, Alyn and Ayna. This is Scooby. She’ll be staying for a while. Let the cooks prepare something delectable for us. We’ll head to the dining hall.”
“Yes, your highness.” The two said in unison with a bow before leaving.
Scooby felt enchanted by the whole thing and stood in silent awe, trying to take it all in. Atlas lead her to the dining hall which had similar colors on the walls and floor like the foyer but with a large long table that could seat around thirty people with an aqua and gold tablecloth stretched from end to end. The chairs were gold embroidered with teal cushions, yet one was a tad bigger and more adorned than the others, meaning it belonged to the king. Atlas sat down in that seat on the end of the table and had Scooby took a seat next to him on his right. 
The head chef, a black flat coated retriever merdog, rolled up to the two and presented their food on silver platters. Much of the food looked like the ones she saw in the marketplace, alien squid calamari, fried purple eel fish, and boiled crustaceans. They ate their meals while chatted more, growing much closer to each other. 
After cleaning their plates, the tour of the castle continued. Going up some floors and passing many guests rooms and bathrooms, she was shown the spa room for massages and pampering, a royal bath, and finally, down a large hallway with pictures and art not too different from the rest of the castle, they winded up in front of Atlas’s bedroom with two large crimson decorative wooden doors.
“Now for the grand finale of the tour, my room.” He said as he opened the doors, revealing its contents.
The room had the familiar color scheme the rest of the castle had. At the back of the room lied a large king size bed with a sea green and gold embroidered headboard with light blue cover and teal canopy. On the left of the room had a square table and a three-tier bookshelf. On the right was fancy drawer with two compartments with a full body mirror next to it and a walk-in closet. 
Scooby’s eyes glanced around the king’s bedroom with awed wonder. 
“Wow, it looks…lovely.” She commented.
“Thank you, I’m glad you like it. You’ll be staying the night here as well.” he replied while he embraced her, making her face and crotch grew hot as his strong musky scent invaded her nose.
“O-oh, but you-you don’t have to do th-that! I’ll just stay in one of the guest rooms.” She protested nervously with her wagging tail betraying her. 
“But I insist! Scooby, to me, I felt our time together was something special. Don’t you agree?” he said.
Scooby just weakly nodded while getting lost in his eyes, losing the ability to resist the hunky hot merdog as her body became needy while inhaling his musky scent. Then, their muzzles connected into one long tongue tangling kiss. Atlas broke it for a moment.
“To the bed, my sweet.” He said as he carried her bridal style and laid her on top.
He slowly crawled onto the bed only to stop with his snout facing her crotch. He playfully licked her snatch, making her body shudder and a moan escaped her muzzle. His tongue traveled up her body, stopping at her tits for a moment. He then lapped her breasts as his tongue swirled around each nipple, causing Scooby to whimper and moan louder. He reached her neck, licking with playful nibbling. Soon, they were deep kissing mouth to mouth again until again Atlas broke it to speak.
“Shall we go further, my love?” he said while aligning his fully erect and unsheathed eleven-inch humanoid member with her snatch, his tip teased her flesh tunnel. 
“Yes, please! Take me, Atlas!” Scooby cried as she held onto the king, bracing for genital impact. 
He smiled and then, with one big thrust, his dick dug deep into her depths.
“AAAAaaaahh! OOOOoooo~hhh!” she moaned, curling her webbed toes in reflex. 
“Ungh…! Mmff… Ooo~h…” he grunted and groaned as he rhythmically pumped in and out of her.
“Fa-aah…Fast..-er…Atlas…haah!” Scooby pleaded in between panting moans.
The king complied as he quickened his thrusts, grinding her inner walls harder. Louder and louder the moans and groans from the couple grew. Scooby had to wrap her legs around him to keep steady as the bed rocked due to the rough constant humping. She was on the brink of climaxing, feeling the pressure build up within her. 
“Oooh! Oh…Atlas. I …haah! I-I’m gonna…Aaah! CUM!” she screamed as her trench splashed a wave of cum onto his spear, making in slick with her juices.
“Ungh! Mmph….Oooh. Yeah, me-TOO!” he cried out as his shaft let out a deluge of cum, flooding her womb fully. 
His creamed cock exited her with a wet plop as a cum oozed out of her snatch. They basked in the afterglow of sex as they embraced in each other’s arms.
“Love you, Scooby.”
“Love you too, Atlas.”
Sleep soon overtook them.

Two Years Later

“Alright, men! Pull!” 
On the stairway in front of the castle, a group of burly male merdogs pulled thick ropes, propping up a golden statue of their new queen, Scooby, next to the one of Atlas in front of a crowd of citizens celebrating the event with the royal couple standing in front of center. The statue had her likeness along with a newly sized H cup rack but lacking the basketball sized baby bump she was currently sporting along with the baby in her arms, Delphne, a female chocolate furred and spotted German Shepherd mermutt, who was sucking on a teat.
After the statue finally stood side to side with the other, the crowd cheered and howled for the new royal family as the king and queen kissed on the statues’ base. 

THE END