"Wowee Scooby, I think we're onto something!" exclaimed Shaggy as they came down an elevator into a huge room while they were on the lookout for clues. "It's like a huge laboratory!" As they came down the elevator, they saw tons of lab equipment full of chemicals, some smoking and bubbling while some not.
"Like Scoob, this is like Cluetopia" said Shaggy as he examined what looked like an odd door.
While Shaggy was looking at that, Scooby saw a funny mirror with a handle. "A refrigerator," he said with an excited tone. Scooby opened the fridge and looked inside to see beakers of brightly colored liquids. His eyes caught a bright yellow liquid and said "Mmmmm remonade" and dunked his tongue into it, surprised to find a more gelatinous substance. He still ate it, assuming it couldn't be absolutely gross.
Scooby's face puffed up as soon as he swallowed and turned to look in the mirror of the fridge to see that he became an odd green and brown alien, with his eyes on stalks, multiple tentacles, and a large, round belly.
"Look at these weird letters, Scoob," Shaggy proclaimed while still looking at the odd door.
"Raggy?" Scooby questioned. Shaggy turned around and his eyes went wide as he watched Scooby's transformed body turn towards him, his potbelly jiggling and each tentacle holding a beaker or flask filled with potions.
"Scooby… you turned into a freaky monster!" Shaggy screamed in fear. "There has to be something antidotal around here somewhere"
As Shaggy was quickly scanning the refrigerator looking for an antidote, Scooby was playing with his alien body, looking at his big belly and jumping to watch it jiggle. He slapped Shaggy's butt with one of his tentacles while he looked through the potions and giggled, making his low hanging stomach shake even more. Shaggy glared at Scooby for a second and then kept searching.
"Here Scoob, try this, it looks medicinal." Shaggy shoved a beaker full of blue liquid into the tentacle that slapped his butt. Some of it spilled onto his fingers, and Shaggy examined it with an interesting look. He sniffed it and thought it smelled like a girl's perfume.
Scooby poured the potion down his elongated snout, swallowed, and burped into Shaggy's face, making his big belly jiggle one last time. Shaggy decided to lick the potion off of his fingers.
"Mmmm, tastes like cup-," Shaggy got cut off as him and Scooby's bodies started involuntarily convulsing. Shaggy could feel his stomach getting really hungry, but nothing else felt weird. Eventually they stopped shaking and Shaggy turned to the mirror.
"Cupcakes, hm, look Scooby nothing happened to me-" Shaggy looked in the mirror in shock as he felt his clothes shift and his heard liquid noises as his body morphed and transformed. His head and voice hadn't changed, leaving his scraggly hair and goatee. Everything else was different though.
Looking back at Shaggy in the mirror was the body of a hot girl. His shirt had turned into a crop top, showing his new thin stomach that immediately growled with hunger. His fingers were dainty, and his wrists were limp, with one hand on his new thick thigh and the other hanging. His pants were tight on his new thicker legs. He could feel how big his new butt was jiggling with the smallest movement.
He looked down at his new body and saw two fairly large lumps coming out of his shirt and realized that they're boobs. At least C cups, he was entranced by how they felt on his body. He smirked and reached up to feel them, noticing how big and soft they are. The potion did not provide him any new undergarments, so his new nipples were visible through the crop top, which happened to also have a deep V to show off his newly grown cleavage. He also noticed his bulge was gone, with something new in its place.
"Shaggy, find me a potion!" said Scooby, who was now the Tasmanian Devil and spinning out of control.
Shaggy got shaken out of his trance and decided that it would be better if they had just found an antidote. He went back into the fridge looking for another potion that could be an antidote. His motions were extremely feminine, pushing the potions out of the way. As he was bent over searching, he could feel his new breasts shifting around in his shirt. Scooby, still as the Tasmanian Devil, stopped spinning to stare at Shaggy's freshly grown thick butt as he was bent over, looking through the fridge.
Shaggy's mind was racing while he was trying to find a potion. He thought, "We have to find an antidote soon. I have BOOBS! And they're huge. Fred wouldn't even be able to look me in my eyes. Wait wait wait… here let's try this potion maybe."
Shaggy pulled out a test tube filled with a white potion but threw it over his shoulder like a girl. He wasn't paying attention, though, and it hit Scooby in the face. Shaggy grabbed a flask filled with a hot pink potion, threw his head back, and chugged the potion.
Shaggy's body convulsed again while Scooby spun around. Scooby slowed down and was different. He suddenly had glasses and a lab coat with Einstein-like hair. He pushed up the glasses and spoke with a nerdy voice.
"My god, it seems as though I've become ludicrously intelligent my dear friend." Scooby said as he looked around.
Shaggy finished convulsing and looked in the mirror in shock as his mind started to cloud over. His face had morphed into that of a hot girl. His eyes were big and his lips filled up in front of his eyes into big pouty pillows that couldn't close all the way due the weight. His goatee retracted into his face as it thinned out and his hair grew down his back. His clothes tightened as his already large boobs grew bigger and heavier. At least double D's, he thought to himself. His tight pants turned into booty shorts as his rear expanded even larger. Nerdy Scooby even got distracted by the massive globes that were growing out of Shaggy's behind.
"Like, Scoob, I transformed into a complete sexy girl…. Oh my god even my voice is kinda cute hehe!" Shaggy said as he turned around to face Scooby, his new cleavage knocking a potion out of Scooby's paws.
Shaggy looked in the mirror, shocked at his, or her now, new appearance. She felt her mind starting to shift and morph, forgetting who he was and only thinking about makeup, clothes that would make her new boobs look good, and boys. "Oh my god," thought Shaggy, "I think I like boys now too."
While Shaggy was checking himself out in the mirror, Scooby was frantically trying to make a potion with his newly discovered knowledge. He had an entire monologue about his past life, but Shaggy was too absorbed in exploring his new body. Shaggy was turned around playing with the two beach ball sized cheeks that are his butt and was so absorbed in it.
"Hey Scoob, check this out." Nerdy Scooby stared blankly as Shaggy puckered his huge lips and bent over to show more cleavage and stick out his thick behind. "I grew humungous knockers; do you think they look good nerd dog?"
"My goodness, you have become stupid. I am almost complete with my antidote, but it is highly flammable, so keep your enormous bust away from it."
"Like, huh? It's highly what?" Shaggy scoffed in response. "And you think they're enormous?"
Shaggy shoved his enlarged boobs and shook them around in Nerd Shaggy's snout, causing him to drop the combustible potion and making it explode.
From upstairs, Daphne, Fred, and Velma heard the explosion and came down the elevator to check out what was going on. They saw that the odd door was blown open, and then heard a woman.
"This is absolutely DISGUSTING" Shaggy exclaimed while being pressed up against the wall with soot and ash all over her body.
"Jeez, this bimbo nearly destroyed us with her enormous bosom and rear" Nerd Scooby said from next to her.
The rest of the gang was staring in disbelief at what they saw. A smart Scooby and a hot girl Shaggy, what in the world had happened?
Fred was particularly perturbed, mostly due to Shaggy's new sex appeal. He couldn't rip his eyes away from the two melons on Shaggy's chest. Shaggy fell from the wall and Fred could also see her newly grown butt and was confused on how he should feel.
Bimbo Shaggy saw Fred as she fell off the wall and got warm. "Hey, you're pretty cute," Shaggy said as she pressed her chest against him and put her hand on her chest. Fred couldn't help but think about what those blown up lips could do.
Nerd Scooby used the potion on himself, turning back to normal. In the process of transforming, he accidentally dropped the vial of antidote. Velma is the first to realize that Shaggy might stay this way for awhile. They looked over to see Shaggy and Fred making out, Fred's hand on Shaggy's behind.
Daphne, infuriated, said that they need an antidote ASAP and threw a potion on Bimbo Shaggy out of anger. Shaggy shook around as his body basically deflated back to normal.
"Man, that felt like my freshmen year of college," Shaggy said, now back to normal.