It was a nice and sunny day, the sun shining over the BFB contestant grounds as midday clouds lazily drifted across the sky. Firey was sitting underneath a tree, the trunk behind him slightly scortched, reading a book and trying to keep it far enough away from his body not to set it on fire. He turned the page, and lost his place when he heard footsteps behind him. He looked up and around the trunk of the tree to see a familliar lime-colored leaf happily trotting up to him.
"Oh, hi Leafy!" Firey said.
"What's up?" Leafy said cheerily.
"Just getting some reading done." He says, and places his book down. "Did you need somethin?"
"Actually Firey..." Leafy continued, "I have a gift for you! Yknow, as a thank you for the ferris wheel?... even though it got destroyed."
"Wow, really? You totally didn't have to do that!" Firey said, excited. "You're too nice to me, you know that?"
"Haha, well, I try my hardest," Leafy said bashfully, and pulled out a heavy-looking, colorful box. "I was at Yellow Face's warehouse yesterday, and I noticed these gasoline sodas. You're made of fire, right? So I figured you'd like em. I tried one, and it was definitely not for me," She said, and handed Firey the box with both hands. He smiled and inspected the box- a 36 pack of Yellow Face brand sparkling sweetened gasoline. It was decorated with cartoonish flames up and down the sides of it- and the cans were stylishly printed with the same fire pattern.
"Thanks Leafy!!" Firey said. "Should I crack one open right now?"
"I don't see why not!" Leafy said. "I wanna see if you like them!"
Firey took one of the cans out and pulled on the tab. CRCK-HSSS. The lid cracked open and little bubbles of thin black liquid bubbled to the surface. It smelled strongly of gasoline, of course, but also a hint of something sweet- musky but appealing. Firey gingerly took a small sip. THOOM! His flames flared up and scorched the overhead leaves of the tree above- Firey smacked his lips. It was like the stuff evaporated the second it hit his tongue and turned into envigorating flames- It tasted like a fresh cup of iced black coffee. After a couple seconds, the extreme flames died down, but his overall body seemed more energized and maybe even... slightly bigger.
"WHOO! That's strong," Firey said. "But really good!"
"Hehe, glad you like it!" Leafy said.
Firey licked his lips and took another swig- a huge gulp of the stuff, and after the flames rocketed towards the sky directly after his swallow, they stayed bigger than before- He was chugging the dark liquid now, his flames starting to turn blue at the top. Leafy looked a bit intimidated.
"W-woah, Firey, be careful!" Leafy stuttered, "Man, you really like it, huh?"
After he finished off the one can, He crushed it between his two hands effortlessly and threw the can to the side.
"Whoohoo! I feel like I could take on the world!" Firey noticed that while he was usually around the same height as Leafy, he was now slightly taller- and he felt a lot stronger and hotter too. "Remind me to buy some more of this stuff next time I end up shopping," Firey continued, and took a few steps around. He hadn't noticed it before, but his hands and feet were bigger now too- Which made his footsteps satisfyingly loud and powerful. Thump, thump, thump...
Firey took the box of cans for the road- He was hooked immediately and couldn't get enough.
"Welp, you're welcome, hehe." Leafy chuckled. "Are you leaving now?"
"Yup. I'm gonna go find Coiny," Firey said devilishly, cracking open another can and taking a swig.
He stopped every couple minutes to quickly chug another can- after each one, he was getting bigger and bigger and so were his limbs. Gulp, gulp, gulp... After every swallow, a wave of red hot flames coursed through his body and up out the top- heat rises, after all, and he was starting to get taller and taller, bigger and more powerful- he was starting to look noticably much much bigger than the rest of the contestants. Not just his flames, his whole body too- after about 10 cans he was twice as tall as even Flower. He felt like he could run a marathon and then some- with his newfound giant-ness he could probably run halfway across the globe and back. The cans were tiny in his giant mittenlike hands now, they were almost novelty- It was getting harder to get his stubby fingers in to open the cans now.
When he loomed over the tiny Coiny, he whipped around and his eyes suddenly became huge- Firey many times bigger than him cracking a devilish smile, Coiny looked afraid and then awestruck.
"Wh- Firey?!" Coiny said, flabberghasted.
"Yup, that's me, TINY." He said, and teasingly knocked Coiny over with his giant foot that could cover his whole body with ease.
"Woooooaahhh! How did you get so HUGE?" Coiny continued, marvelling over his frienemy's newfound size.
"A little trick I learned from Leafy- Adding gasoline to a fire makes it bigger!" He said cheekily, and held out a can of gasoline soda. "Want some?"
Coiny looked at it inquisitively. "Ew, no, that sounds disgusting!" He said.
"But- well, okay... But I gotta ask you for a favor!" Firey said. "My fingers are too big to open the cans now, heheh..." Firey said, slightly embarrassed. "Can you open this for me?"
Coiny paused. "...Or what?" He said inquisitively.
"Hehe- Coiny, you're ignoring the fact I could easily crush you underneath my foot right now..." Firey said, and Coiny looked nervous.
"Oh yeah. I forgot." Coiny jumped up and grabbed the can out of Firey's hand, cracking open the lid and handing it back up to his partner. Firey poured the thing into his mouth, picking Coiny and the box of cans up and putting them both into his hand. He wasn't quite big enough to fit Coiny in the palm of his hand yet- Comparitively, Coiny looked a bit like a giant novelty coin or a stuffed animal perched on his hand, holding the box on his lap. Once Firey was finished gulping down the 11th can, he grew bigger and bigger in pulsing waves with Coiny still sitting there- He got a bit excited and cracked open another one to hand to his frienemy.
"Ahhh- That hit the spot." Firey said. "Thanks Coiny."
Firey was able to keep growing and growing as he chugged down the addictive liquid, Coiny acting as his enabler, but once he was so big the cans didn't make him grow much more- But he couldn't stop. He felt so powerful and the drink was just too delicious- with every can he downed he felt bigger and better. He was a bonafide giant now, looming, towering over X's aloe garden and all the tiny contestants- Including Leafy, who had a look on her face that said "What have I done". Firey was trying not to step on anyone- last thing he needs in this game is people holding grudges against him for trampling them. The very last can slurped down Firey's mouth- the thing looking less like a can and more like a tiny pill between his huge fingers. Coiny was cheering him on like a cheerleader- The butterflies in his stomach must've gone to his head. Firey kept walking with the now-tiny Coiny sitting in his hand looking like an actual coin- Firey's flames felt like they were grazing outer space. Everyone around him felt his heat like a radiator as he stomped loudly across the landscape, being careful not to smoosh anybody with his huge, soft, warm feet.
Firey took a moment to sit down and look at the miniature Coiny in his hand, which left the tiny thing flustered. He covered his eyes with his hands and Firey let out a giant giggle.
"Hehe! You're even tinier now, Coiny." He said, and poked him with his finger, that now took up his entire body.

After 4 or 5 hours of macro shenanigans, Firey noticed himself getting smaller- The fuel must be burning out. At least he had fun while it lasted!

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based on the new video on JnJ's channel where Firey said that gasoline makes him grow bigger- that picture is where the thumbnail actually comes from XP!! I hope you like! this one's a bit of a long one :>