An inteleon lab assistant to his mewtwo professor, Inteus is eager to try their new improved gigantimax research out for himself and share it with his two partners. What he made quickly proves to be far more potent than he initially realized, and both he and his lovers seem to enjoy the results quite a bit. 27 pages / 11,000 words of shrinky and growy pokemon fun. I wanted to challenge myself to write a story without sex and am pretty happy with the results (not that this will become the norm for my stuff).

--- Here's a short excerpt from the beginning of the story since it's too long for FA:

A mewtwo wearing a lab coat grinned madly at his computer screen while his hefty tail knocked
over the chair behind as it swished about. He only noticed it when it toppled over his paws and shot a
bolt of pain to pierce through his elation.

“Gah!” the mewtwo jumped at the pain, only to trip over the chair and his own fat tail. He just
barely managed to catch himself on the counter before falling on his ass completely. “No matter how
long I spend in this body, I still can't get used to this damned appendage!”
The nearby inteleon chuckled at the display, and he just couldn't resist giving the mewtwo a
hearty thwack on the back with his own impressive tail to further agitate him.

“You have to get used to it eventually, professor,” the inteleon teased, “Hard to take world
domination seriously when your designated despot keeps tripping over his own tail.”

“I think I liked you better when I couldn't understand you, Inteus,” the mewtwo growled back at
the tall lizard, “Were you always such a little smart ass?”

“From the second we met, professor Marquis. For what it's worth, I like you better in your new
body.”

Marquis was about to retort, only to realize he agreed with the inteleon. He didn't exactly hate
his human self, but becoming a mewtwo was nothing short of liberating. Taking off with the old Team
Rocket mewtwo research data years ago had finally paid dividends, and he was one step closer to his
dream of unlimited power. The simulations he just ran showed favorable results, and he was finally
ready to run practical tests of his creation.

“Well I hope you're ready to be my little lab 'chu, because the serum is ready for testing,”
Marquis said with a smug grin as his tail began to start swishing behind him once more. Inteus rolled
his eyes with a smile and made his way for the test chamber.

As much as he liked to give grief to his professor, Inteus was intimately acquainted with their
current project. Between some rare Alpha cells from a couple of friends on the main islands and some
smuggled dynamax crystals, the inteleon was just as eager to see the results of Marquis' research, too.
The test chamber itself was fairly large. It was a repurposed underground storage facility with
bright fluorescent lights. An old overseer's office had been renovated into a proper observation deck,
and Inteus could see his mewtwo professor looking down on him from on high. With a cheeky wave,
the inteleon approached a pneumatic mail tube in the corner of the room. After the pod popped down
and opened up, the inteleon took a corked test tube with an opaque glowing pinkish-red fluid inside.
“Just pop the cork out and administer the serum orally,” Marquis said over the intercom
speakers, “The testing solution is a diluted prototype of the real version. There shouldn't be any issues,
and I'm sure you'll enjoy the results.”

For a moment, Inteus just rolled it around in his hand. It took a second to steel his nerves and
actually open the test tube, taking a quick whiff before pressing it to his lips. The mixture smelled like a
strange combination of cinnamon and berries, and it left a spicy burning sensation as he chugged it
down to the last drop. The warmth spread from his throat and stomach out to his whole body like an
incredibly potent fever. Inteus squatted down with his hands on his knees as he began to pant for air.
Inteus thought he could hear some muffled voice over the intercom, but his head was in such a deep
haze that none of the words registered. All he could focus on was the fiery heat radiating from every
pore.

Inteus noticed that, as the inferno raged on within him, his body began to feel significantly
heavier, yet his movements didn't get any more sluggish. Even with his body temperature continuing to
skyrocket, the inteleon felt better and better with every second. After a minute more, his body burst into
magenta flames, but he didn't burn in the least. He could tell Marquis was worried over the intercom,
but feeling the heat leave his body through the fire enveloping him was far too pleasing for him to care
about the mewtwo's words.

The temperature within his body pulsed lower with every burst of flame, gradually expelling the
excess heat as he finished metabolizing the serum. Once the fire was out completely, Inteus let out a
deep steamy huff and began to inspect himself. Immediately, as he automatically wagged his tail in
excitement, he noticed two more swaying with the first. Moreover, when he looked back to inspect his
three tails, instead of being a solid light blue the whole way down, the tails had red tips with a thin red
stripe stretching along the top all the way up to the tails' bases.

As he was craning his neck back to get a good look at his backside, he also noticed the bottom
edge of his natural yellow cape now sported the same bright red colorization, as did his arms from the
shoulders down to his wrists. With his body inspected, his attention turned to the rest of the room.
Inteus was thankful to see that nothing had actually been burnt by his strange transformation,
but it did all look a good bit smaller. This was expected, of course. Marquis had been researching alpha
genetics and the dynamax process to create this very result, though given how large some pokemon got
during a proper dynamax transformation, he was a bit disappointed he didn't get even bigger. Still, his
improved body was plenty enticing, especially for the mewtwo that suddenly barged in from the nearby
lift.

“Incredible!” Marquis exclaimed, practically hopping on over to the bigger inteleon. His hands
were immediately picking up and closely inspecting the extra tails as well as the inteleon's new red
markings. He then whipped out some measuring tape and floated up toward the inteleon's head. “Your
growth was obviously the goal, but I didn't expect these other aesthetic changes in response to
metabolization of the serum. It's quite exquisite, especially around your eyes. Twelve foot six inches
tall, too- exactly double your previous height!”

“Wait, my eyes?” Inteus asked. He wasn't exactly able to see his own face previously.

“Yes, yes, uh, here,” the mewtwo scrambled and produced a small hand mirror from his labcoat
pocket. Inteus felt his heart skip a beat when he took that tiny hand and mirror into his own much
broader palms, and he was even more pleased when he got a proper look at himself.
The mirror was a bit too tiny to properly show his whole self all at once, but at the very least he
could now get a good look at his bright red eyelids and the almost mascara-like red markings that
surrounded his eyes, coming to a point at the back edges.

“I take it you're ready for your turn,” Inteus said as he returned the pocket mirror to Marquis.
The mewtwo grinned and nodded with near manic glee.

“I dare say my results will be even more impressive! I hope you're ready to bask in the glory of
a new god even mightier than Arceus!”

Inteus just rolled his eyes and nodded with a wry smirk as he left the mewtwo in the test
chamber. The lift was fairly cramped with his new stature, though the inconvenience of having to
squeeze in and squat down to fit was far more amusing than it was frustrating. And with how lithe
inteleons were, there wasn't much worry of him exceeding the weight limit regardless of his stature.
The hallways of the laboratory were only slightly better. Most of the ceilings were about ten feet
high, forcing Inteus to walk with a slight hunch as he made his way over to the storage chamber. As he
pushed open the door, the inteleon startled himself when it ripped straight off its hinges in a spray of
metal scrap and wood. He awkwardly dropped the battered door to his side and inspected himself again
for a moment.