"Huh..." Jake started as he read the computer screen. "According to the article, only adults are allowed in that contest." he said while moving his finger through the screen. "Young guests may change their ages in the Age Wing or a Mix Room, but will participate in a special category."
"That sounds easy, hehe..." Elliot chuckled as his body started to get older. He lost some height in order to look more like an average man, but his muscles got a lot thicker once again. His face turned more mature and his body got a bit of fat, allowing him to become a cute stocky young man. His bulge didn't grow this time, so now he had a member in accordance with his new size.
Jake stayed completely speechless as he saw his little brother going from a 'little' boy to a 30 years old young man in just a few seconds.
"Ready." the bulky young man said with a big grin in his face.
Elliot started to rub all his muscles. At the same time, he felt how his mind was changing too, giving him numerous adult knowledge but retaining some of the happiness and innocence of the child he was inside.
"Holy shit." Jake said as he stared at the huge man that stood in front of him.
"What do you think about this, little bro?" Elliot said as he posed for his brother.
"Stop calling me like that..." Jake said angrily.
"What? Little bro? Take a look at yourself bro, you are younger than me now hehe." Elliot chuckled. "You really must try this." he continued while rubbing his pecs and flexing his biceps. "It feels SO good..." he tried to look down, but all he could see were his bulging pectorals.
The kid-now-man then went to the closet and opened it. It really had everything he needed for that new body.
"W-what are you doing?" Jake wonders as he sees his brother searching through the drawers.
"The contest is held in a few days, I have plenty of time to enjoy this so I'm gonna spend the day in the age wing's pool." he said as he picked up a normal speedo. "Hmmm... This will work." he said and quickly switched from the posing speedo into the normal one, which would had drawn too much attention, squeezing his new bigger package into it. The resort had pools located at every wing, but the age wing's one would be perfect to see his competitors because most kids would go there to get older in order to participate in the contest.
"Yeah, it feels like I expected!" the stocky man said while staring at his own reflection in the mirror. "It's tight, but very comfortable." he said while adjusting the fabric in his crotch and patting his round buttocks, they were clearly noticeable in his new bubble butt.
Jake was still astonished, he couldn't believe that man was his little brother.
"Come on little bro, wake up!" Elliot snapped his fingers in front of Jake's face and laughed. "Accept it, dude, I'm all man now. I LOVE this, and I'm gonna keep this body for the whole summer." he said while petting his brother's hair. "Wanna come with me, little guy?"
"I... I think I'll stay here." Jake said ashamed. He knew the pool was going to be full of huge muscular men and even muscular kids, he wouldn't fit in there.
Elliot then said goodbye and left the room.