A sort of collaboration I did with the artist of the images shown. He requested to remain anonymous, but it was really fun working with him on this and I hope to be able to do more with this concept in the future. Due to being unable to put images into the comments section, download the pdf file for the full effect.

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“Hey Killua, wanna go hit the gym? I’d bet you dinner I can lift way more than I did yesterday!”

Killua just sighed. Gon had been like this for the past week now. “Come on, Gon...cut the act,” he groaned bluntly.

“Wh-What are you talking about?”

Gon might have looked surprised, but Killua knew it was fake. He didn’t really want to have to deal with this today. He was tired from the day’s training and really just wanted to go relax for the rest of the night.

“Knock it off, Gon,” he growled. “I can see the nen aura around your body. You’re trying to hide it again aren’t you?”

Gon did his best to play innocent, but the gig was up. The nen enhancement he worked so hard to make the past week started to waiver, his body slowly beginning to change before his friend’s eyes. Raw muscle surged up beneath his skin and within a few seconds he had already grown to stretch his tank top taught enough for his abs to be fully visible, the tops of his pumped up pecs pushing up past the top of its neckline.

“I-uh-I...I don’t know what you’re talking about, Killua!”

“Sure you don’t…” Killua moaned as he looked over his friend through squinted, judging eyes. “I’m sure you wouldn’t know how you just gained the body of a gymnast?”

“Come on, Killua, I’ve always been pretty strong. You know that.”

Killua was starting to get tired of this. Gon was trying to mess with him, but it wasn’t going to work. He knew exactly what was going on. He had accidentally caused this to happen. He just watched as Gon’s body began to grow again, the tank top creaking and ripping in a few places as his pecs stretched out further in front of his chest. He began to slowly pump his arms, one hand crawling up to find its way to the peak of the opposite bicep.

“Can we just go and get a good workout in? I want to see what these muscles can do!”

Gon was trying to distract him now. Trying to act all eager and get him to go along with the ruse. Anything to get Killua to stop watching his muscles as they continued to billow out more and more with each passing second. Killua was seeing through the act, though. The nen barrier was weakening as Gon’s concentration waned. The holes in his shirt grew wider with noticeable snaps and creaks until they split his shirt down the middle, revealing his bulbous pecs.

“Well we’ve clearly seen that your muscles can destroy your shirt…” Killua deadpanned.

“Eh heh heh heh...you saw that huh?”

Killua smirked, “You suck at lying, you know? Come on, man. Seriously, stop messing around. I already know what’s going on. Stop hiding it from me. Release the nen all the way. Come on!”

“You sure about that? I’ve...gotten pretty big lately. Not gonna freak?”

“Yeah, just lay it on me,” Killua gave him a reassuring smile. He wasn’t sure what to expect, but at least there wouldn’t be anything left to hide.

Gon nodded and the remainder of the nen dissipated, his body surging up in response to being “freed.” The remainder of his shirt was quickly torn away as his pecs exploded out in front of his face. His arms ballooned outwards as they were pushed further out to his sides by his widening shoulders and flaring lats. His traps rose up from behind until they rested nearly at the top of his ears.

“There we go! So what do you think?”

Killua had to take a minute to compose himself. He was actually stunned by the sheer size of his friend. “Wow...That IS pretty big. I guess my accidental wish on Nanika is really taking off…”

It had been almost a month now since he had made that foolish wish. He didn’t even know Nanika was actually listening at the time when he said it. All he wanted was Gon to be as strong as he desired. Guess that desire was bigger than he thought…

“So that’s what’s been causing this! I was thinking my body was just catching up with my strength!”

Killua mentally facepalmed, but kept his calm demeanor. Sure he didn’t expect Gon to know about that wish...but was he really that dense in thinking that? “Well now it’s out of the bag I guess. How’s it feel being so big?”

“Hee hee hee! It feels GREAT! Bet you’d like to get a feel for my huge muscles, huh?”

Killua rolled his eyes, “That’s not really what I meant…”

“Hee hee! Look what I can do!”

Killua watched as Gon seemed to concentrate for a moment and then slowly rolled his pec muscle, lifting it up towards his face. He held it there for a second before letting it fall back down into its original position. He repeated the action with his other pec.

“I’ve been learning to bounce my pecs!”

Killua could only stand there in stunned fascination as Gon started to bounce his pecs before him. He started off slow, but began to pick up speed as he bounced each pec in succession. He would even throw in a double bounce every now and then.

“I’ve been getting pretty good at it…”

“Heh...You look pretty speechless, Killua…”

“Jealous?”

He had to admit...he wasn’t sure himself. Killua could only just stare as Gon popped his pecs one after the other, a cocky smirk forming over his face. Just what Killua needed, an ego the that was growing along with Gon’s muscles…

“What’s the matter? You’re looking faint! My bulked up bod too much for you to handle?”

“Or are you jealous that I can lick my pecs without moving my tongue?”

Gon started popping his pec up to his face where his tongue was eagerly waiting. The pec muscle rolled across the surface of his tongue as it rose up and then back down, a slight sheen of saliva glistening in the gym lights.

“They taste so goooood…”

Gon gave them one last, long lick before settling down for a moment, beaming at Killua with a wide, cocky grin. Killua couldn’t formulate a sentence to save his life at this point. He wasn’t sure how to react to all of this. If he didn’t know it any better, he could have sworn his jaw was open. Gon just took this as an invitation to keep going.”

“Hey...Wanna see how fast I can make them go?”

He didn’t really wait for an answer. He just started bouncing them again, slowly at first, but then picking up more and more speed. Eventually his pecs were almost a blur at the speed at which he was going. Killua knew he had to stop this soon or else Gon would never stop. He sucked up his tongue back into his mouth and drummed up as much focus and energy as he could.

“Alright! Alright! Enough already!”

“Oh! Uh...S-Sorry there, Killua. I guess I got carried away there.”

Gon immediately stopped, the shock of Killua raising his voice seeming to snap him back to his old self.

Killua breathed a sigh of relief. “It’s fine. Can’t really blame you for letting all that muscle get into that thick skull of yours. It’s the only thing strong enough to do so.”

“Heh...yeah. It’s hard not to get carried away when you look this good.”

“Hey! How about we go to the weight room and really see just how strong I am?”

Killua gave Gon a death glare, unwilling to put up with it any longer.

“Uhhh...Eh heh heh heh...Or maybe we can just go back to the room and I’ll order some take out?”

That sounded more reasonable to Killua. He smirked as he nodded his head. Even with the new muscles it was still the same, loveable Gon.

“And then you can take all the time you want to worship these gigantic muscles of mine!”