So, I was looking for fanfics about the transformation scene from Scooby Doo 2, and both the ones I found only really looked at Shaggy becoming even more of a girl from his first transformation. But I've always been way more interested in Buff Shaggy and what might have been with him. So for all of my fellow fanfiction readers who have been similarly frustrated with the lack of Buff Shaggy fanfics out there, this one's for you. Hope you enjoy it.

"Wowee, Scooby Doo. I think we're on to something" said Shaggy as he and Scooby descended on the elevator down into an underground room filled with crowded tables of liquid filled phials, beakers and bottles. "It's like a huge laboratory."

"Reah" Scooby agreed as the elevator came to a stop.

"This place is, like, Cluetopia, Scoob" said Shaggy, walking over to inspect a counter of bubbling green chemicals. Of all their leads on solving the mystery of evil Masked Figure terrorizing Coolsville, this had to be the best one yet. Just look at all this creepy, mad science-y stuff around. If there was anywhere they'd find some solid evidence about where all these monsters were coming from this had to be it.

Finding nothing of interest on the table, Shaggy's eyes were instead drawn to a mysterious looking sealed doorway. On the archway above was a message of some sort, written in a series of strange symbols that he couldn't understand. Now this had to be clue.

"Check it out!" he cried excitedly. "Look at those weird letters, Scoob."

No sooner had he said it and turned around however than his excitement turned to horror when he saw Scooby. Or rather, the fat, green, stalk-eyed, tentacled monster that had once been Scooby, standing in front of an open fridge full of chemicals, with a half empty jar of something yellow in his paw.

"Raggy?" said Scooby quizzically, blissfully unaware of what had happened.

"Scooby Doo" stammered Shaggy, pointing to him in shock. "You turned into a freaky monster!"

Scooby turned around, saw his reflection in the fridge door and screamed in horror.

"You don't eat stuff that glows" said Shaggy. He thrust his head into the fridge, searching the shelves of potions for an antidote. Finally, he settled on a beaker full of blue liquid, quickly handing it to Scooby.

"Here. Try this, Scoob. It looks medicinal."

While Scooby dipped a tentacle into the potion, Shaggy suddenly noticed that in his haste to hand it to him, he had splashed some of it on his own hand. He lifted it up close to his face and sniffed it.

'Not bad. Kinda fruity.'

Curiosity got the better of him and he stuck his tongue out and licked it off his fingers. It was thin and gooey, like half-set jello.

"Tastes like-

Before he could finish talking though, his whole body seized up and he felt a kind of bloating in his stomach, like a huge fart he was about to rip. Then he started convulsing about uncontrollably.

'Like, Dude, what gives?'

But just as suddenly as they started, the convulsions stopped and the fart feeling turned into something else. A sort of tingling bubbling up through his entire body.

-Strawberries" he finished airily. He felt lightheaded. It was good, this feeling. Like a sort of playful tickling inside of him. Like someone tickling his feet, but all over him. He turned and looked at himself in the mirror. His shirt was different to how it had been earlier. Smaller and exposing his bare midriff, which seemed to be shedding the thin, wiry hair surrounding his naval. But he didn't care. He was just so high on his incredible buzz. It was strongest in his chest and around his groin. His dick felt funny. Like it was erecting, but in reverse, and there was a rush of coolness running through it like when he was cumming. That was weird, but it felt so good.

'I've got a weejee!' Shaggy thought absentmindedly, using his own special euphemism for ejaculation.

As for his chest, it seemed to be rippling. His pecs moving up and down, up and down, like a pair of balloons being pumped up and then having the air let out again and again. His nipples felt like they were getting a little bigger too. He could seem them flopping up and down and twirling under his shirt. It felt like a pair of invisible fingers were on them and rubbing them softly.

'Dude, that was some good shit in that potion'. Shaggy grinned from ear to ear, so content in this feeling.

"I'm ok, Scoob" he breathed.

As soon as he said that, his undulating pecs burst forward with a pop and stayed there. And the high ended.

'Zoinks!'

Shaggy's jaw dropped and his eyes widened in horror as he finally saw what his body now looked like. It was thin, but not in the skinny guy way it had always been. It was petite and curvy, with wider hips and an hourglass body with a tiny midriff in the middle. His arms were thinner too, with smaller hands, and they were bare as well. His white undershirt had somehow magically vanished. But none of them terrified him as much as the two, huge, swelling bulges projecting from his chest. BOOBS! FEMALE BOOBS! Shaggy had now turned into a girl his age, with only his head left intact. He turned to Scooby, who for some reason had now turned into the Tasmanian Devil from Looney Tunes.

"I've got a chick's body!" he cried in terror.

'Like, Dude. What the actual flying fuck?!' He was a fucking freak. Now everywhere he went on the street, half the people would scream and run away, while the other half would try to get photos for the Coolsville Times. Imagine the headline. Shaggy Rogers: The Boy with Boobs! The Boy with a…

Suddenly an awful thought came to Shaggy. Without thinking twice, he grabbed the front of his pants with one hand and yanked his other hand down into his underpants, digging his way through his coarse forest of sandy pubes. He could feel his balls. They were both still there, even though they definitely felt smaller. But where was the other thing? Where was…

"No! No! It can't be. No!" Despite everything in his brain telling him not to, Shaggy looked down at his groin and screamed. It was gone! Gone! Gone completely! When he felt like he was having that weejee, was that his last cum before his penis shrank back into his body and turned into a–

He let go of his distended pants, unable to look anymore. There were boobs in his face now. Big, bloated boobies. Pretty sexy actually. He lifted a hand to gently fondle one, to tweak a nipple.

'Wait. Wait a second. They're, like, my boobs!' he thought, snapping out of it.

"I've got BOOBS, Scoob!"

"Rand I'm the Rasmanian Devil" said Taz Scooby.

Shaggy swiveled round and put his head back in the fridge. That last potion hadn't worked. But there had to be another one in here that would. He shoved aside bottles and beakers frantically, searching desperately for anything that looked like an antidote. He tossed away a test tube full of yellow liquid before settling on a beaker full of blue potion.

'Looks good enough' he thought. He tossed half the contents into Taz Scooby's face, then drained the rest of it into his own mouth before throwing the beaker away behind him.

Instantly, the fart feeling from before was back and he doubled over in discomfort. This time there was a loud bubbling noise and he felt his stomach start to bubble as well. He thought he was going to puke. But instead he was jerked back upright and his left arm flung outwards. He could hear the bubbling noise in his ear now. Louder, as if it were coming from underneath the skin of his shoulder. Then there was a loud pop and suddenly his arm felt much heavier now. He looked at it to see that it was no longer a girly arm. But nor was it his normal arm either. It was five times its normal size. A huge, bulky thing anchored to a big, beefy shoulder. Then the next thing Shaggy knew, the pop sounded again and his other arm had transformed too.

'Like, Zoinks!' he thought, as much in awe and wonder as in shock. 'Are these really my arms?'

Just as he thought that he felt his stomach bloating and with a pop, a big muscly leg sprouted out, replacing the thin girly one. Beneath his shirt, he could feel his boobs shrinking away and his midriff squeezing and rippling and hardening. With a final pop his other leg burst into muscly-ness and at the same time his underpants felt a lot tighter, a lot more crowded somehow. For a second his head felt fuzzy, like someone was wiping an invisible cloth over his brain. He wished someone would wipe a cool wet cloth over his skin too. He was feeling hot from his transformation. Like, smoking hot. Then he looked in the mirror and saw his new body.

Shaggy had been skinny his whole life. He'd never let it show but it had always been a nagging source of discomfort in the back of his head. It made him feel small and weak, especially around jocks like Fred. Especially around Fred, who'd never been afraid to show of how much more manly and muscular he was compared to Shaggy. Even after eating ten times his body weight in junk food, somehow he could never get any bigger. He'd always just stayed the same skinny person he'd always been.

Not anymore. Shaggy was now twice his normal body size, all of that in enormous, rippling muscle, which even the large tank top he was now wearing was struggling to keep contained. His arms now sported gigantic biceps the size of frozen Thanksgiving turkeys, attached to large, beefy shoulders. Where once there had been female boobs or a scrawny flat chest, there were now enormous, muscular pecs jutting forward like the prow of a great ship. Beneath the fabric of his tank top he could see the outlines of a contoured, rippling six-pack of abs. Even his neck looked bigger and beefier than usual.

Shaggy grinned a big shit-eating grin. This was the best thing to ever happen to him. He was big. He was beautiful. He was…

"Check it out, Dude" he said, turning to Scooby. "I'm Buff!"

'Is that my voice?' Even that was different too now. In a good way, like everything else. No longer did it have that squeaky, wimpy pitch to it. It was deeper now, throatier and manlier. Maybe even a little bit sexy to the girls.

'Oh what am I saying? I'm ALL sexy now!' His new body was awesome. He had to see more of it, see what it could do. He flexed his arm upwards, barely noticing the ramblings of Scooby, who had now turned into an intelligent scientist dog, as he brought his bicep up into his face. It was the most gorgeous thing he'd ever seen. So big and pumped and pink and smooth. So manly and meaty and full of strength. And it was his. His enormous muscle. He was so emotional he kissed it.

'Who needs girls when I've got these guns?' he thought. Of course, he wasn't really serious. Which reminded him. Girls liked guys with sexy asses. He'd better check his was up to the job. He squatted down a little bit, pulled back his arm, then… SMACK. Jackpot! Nice, firm buttocks that felt just as muscular as the rest of him. This was incredible.

'Dude, I am such chick-bait right now' thought Shaggy. 'Wait 'til Fred sees me!'

Then, like a fleeting bad memory, he remembered his last body. The horror of looking into his pants and finding his manhood gone. Surely his luck couldn't be so bad as to get this whole Greek God body and not get that back? With some trepidation, he reached for the front of his pants and pulled them out again.

'Holy shit! Look at that thing!'

Whoever the genius who made that potion was, they were now Shaggy's new God. He hadn't just turned into an Adonis with bulging biceps, legs and pecs. He now had what had to be the world's biggest penis too! It was massive, the size of a salami! Long, thick and veiny and, yes, even muscular itself, lying coiled in his underpants on top of his new, golf ball sized testicles. No wonder his voice was much deeper now with nads that size. The weejees he'd have with this bad boy could fill a swimming pool with his cum!

Shaggy whooped and gently slapped his big sack. He'd never felt so happy in his life. He wanted to show this to somebody. To share his magnificent muscles with the world. But right now, the only one to show off to was Scooby Braniac. Still, better than nothing.

"Check out my pecs, Little Man!" He thrust his arms upwards, then down again, flexing his giant pecs. All at once there was a ripping sound and Shaggy felt cool air on the front of his torso. He looked down to see what had happened. The thin tank top fabric had finally given way. His flexing pecs had ripped through it and split it right down the middle, baring them and his abs in all of their rippling, perfectly symmetrical glory!

'Sweet!'

Shaggy was ecstatic. His incredible buff body just kept getting better and better the more he experimented with it. Just look at it! He couldn't wait to get it shirtless on to Coolsville beach with all the other bodybuilders. The girls wouldn't be able to resist him. They'd all come running for him and his giant muscles the way he and Scooby came running for hot dogs. They'd definitely be impressed.

Scooby Braniac however, was clearly less than impressed, looking distastefully at Shaggy's display.

"Hush now, Buffoon" he snapped, hurriedly mixing the contents of two potion beakers together. "This is a very highly combustible synthesis."

'A highly combu…, A combustabo simpleto…, A hi…'

"A what?" said Shaggy. Suddenly big words felt harder to him than before. Scooby Braniac rolled his eyes as he stood with two potions, a blue one and a green one.

"I'm going to transform us back!"

Shaggy's face fell. He may have lost his ability to understand big words, but he knew what that meant. Scooby Braniac wanted him to drink that potion. To turn him back into a skinny little wimp again. To make him say goodbye to this beautiful new body that he'd barely had any time to do anything with. The shirt ripping pecs, the six pack abs, the beefy shoulders, the tree trunk legs, the turkey sized biceps, the giant dick! All gone just like that.

"No way, Geek!" Shaggy bellowed, his powerful voice reverberating throught the lab like a lion's roar. He wasn't going to let anyone take away his muscles from him. He snatched the beaker with the green potion out of Scooby Braniac's paw, the one closest to him, that had to be it. It was easy. The little weakling couldn't even attempt to match his strength.

"What, what, wha-?" Scooby Braniac babbled incoherently. He clearly hadn't been expecting this.

"I'm gonna stay this way, forever!" Shaggy went on. He turned towards the doorway with the strange letters and hurled the beaker at it with all his might. Even with that simple act, he felt the raw, immense strength coursing through his arm. It was a real rush of energy.

NO!" cried Scooby Braniac, covering his head with his paws. Shaggy was about to suggest he just make another potion and only change himself back when there came an ear splitting bang as the beaker smashed against the door and its contents exploded in an almighty conflagration. A powerful shockwave flung Shaggy and Scooby Braniac back against the wall on either side of the fridge, though Shaggy's body mass was now so great that he actually made his own Shaggy-shaped dent in the wall itself, embedding himself in it. A pall of ash hung in the air in front of them.

Dazed by the explosion, Shaggy spent the next few minutes feeling dizzy and slightly unsure of his surroundings. He couldn't remember anything about what had happened just now, except that there had been a big bang. When he next came to his senses, he was aware of Fred, Velma and Daphne staring at the fresh hole that had been blasted through the doorway and the sound of Scooby Braniac scolding him.

"This Schwarzneggian oaf almost destroyed us!"

The rest of the gang turned around and saw them. Velma and Daphne's eyes widened in shock and Daphne's jaw dropped, clearly awestruck by the sight of the new Shaggy. Shaggy was barely aware of what Scooby Braniac was saying. He was just liking the effect he seemed to be having on the girls. He wrenched his head out of his self-made dent just in time to catch the words 'destroyed us'. He didn't quite get what they meant, but they kind of sounded funny.

"Go boom!" he said with a throaty chuckle. Velma seemed to tremble a little as he did.

"Yes, hilarious" said Scooby Braniac sarcastically. Shaggy looked over to him.

'Oh come on, Gramps. You're no fun. And you got my new muscles all dirty.'

"Well, joke's on you, Dimwit. That was just the byproduct you threw away" Scooby Braniac went on. He held up the blue potion that he had somehow kept clinging on to this whole time. "This is the real antidote!"

'Oh shit!' thought Shaggy, but all he managed to get out was "Oops".

"Oh, you are embarrassing" drawled Scooby Braniac. And without warning, he thrust his paw forward and flung half of the potion directly into Shaggy's open mouth.

'No! No! No!' thought Shaggy as the potion sloshed around inside his mouth. This one tasted a little like strawberries too and already he could feel a little bit of it flowing down his throat. 'Not my beautiful, buff muscles!' Before he could swallow any more of the potion, he spat the rest of it out on to the ground, where it lay in a fizzing puddle.

But even so, the fart feeling and the bubbling were back again, just like when he'd last transformed. Shaggy leapt down from the wall, swaying drunkenly as his head started to spin. He'd spat most of the potion out but was that little bit he'd swallowed enough? Was he still going to turn back into normal Shaggy? The skinny wimpy little runt who couldn't gain any weight or fight monsters or attract hot girls? Was this it for his new body? The fart feeling grew stronger and he could feel the feeling of the invisible cloth wiping over his brain again.

'It's no use. This is it. Goodbye, my muscles. I'm glad I got to know you!' he thought, closing his eyes in defeat. The fart feeling was intensifying all the time. He felt like his guts were going to explode at any minute. Then it all rushed to his ass and he actually did fart, loudly.

But there was no smell. Instead, he felt a new sensation. Like water flowing over his skin, except that it was all dry. He opened his eyes to see that all the ash and dirt and grime on his body was falling off, sliding away in sheets to reveal the pink, shiny skin and green shreds of clothing underneath once again. Then, when he was all clean, the sensation stopped and he felt normal again.

'Like Dude, what just happened?'

He looked over at Scooby, standing by the empty beaker in his normal form again, looking at him with amazement, as were Daphne, Velma and Fred. The same expressions as when they'd first seen him. Why? Shouldn't he be skinny again? Or had he accidentally turned into something else now?

He looked down at his legs. The tracksuit bottoms he'd been wearing earlier were still there, holding in legs with huge, bulging calves. Shaggy's heart started pounding. Could it be? He had to be sure. He turned to face the fridge door and wiped away the grime coating it to reveal his reflection.

"Yes!" he bellowed triumphantly, in the same deep voice. It had worked. He was still the same buff and manly muscle man he'd been before. He'd saved his new body. It was all still there. The pecs, the biceps the abs, the shoulders, the legs, the… Shaggy reached down and grabbed his groin. Yes! That was still there too! He turned around and jumped for joy, sending shockwaves through the lab floor as he landed that sent Fred tumbling back onto his behind. He was so relieved and so happy he didn't know what to say. In the end he settled for:

"That was almost exactly like my freshman year in college." He didn't know why he said that. It just felt right for some reason.

"Raggy" said Scooby. Shaggy looked at him.

"No, Scoob. Not anymore." He was new man now. A real man! A buff man! And he needed a new name. He flexed his biceps, bounced his pecs and clenched his abs in a pose.

"From now on" he announced to all in attendance, "call me Buff Shaggy!"

And so, there you have it, readers. Shaggy is now buff permanently. Hooray! Hurrah!

Now the question is, would you like to see what else he gets up to? How does being buff work out for him in real life? And how is the rest of the movie different from here on now that he is buff? If you'd like this fic to continue and have any ideas for the aforementioned things, please leave them in the reviews section.

Hope you had as much fun reading this fic as I did writing it.