Kiba abruptly stopped at the provocation and turned on his heel "The true future Hokage isn't afraid of anything" he retorted before pulling a single enormous pill, the size of a grape.
"Well then prove it," Naruto continued to provoke.
"Fine!" Kiba yelled, as he downed the large foul looking pill.
For a moment both boys just waited expectantly for something to happen but after a minute of nothing Naruto said "See? Told you it was no big deal!"
"Yeah, yeah, yeah," Kiba said, feeling slightly queezy, but resolved not to let on. "Let's just play some cards or something," he suggested setting the bottle down and fishing through a drawer for a deck.
"Okay!" Naruto agreed excitedly, ready to actually do something.
But as they walked to the table in the Inuzuka's living room Kiba suddenly collapsed, groaning with pain. Naruto raced to his side, gripped by alarm when he discovered Kiba's body was radiating an absurd amount of heat. Lost for words or solutions Naruto was about to try and locate Sakura or Grandma Tsunade when the heat abruptly abated and Kiba assured him he'd be fine.
Still somewhat apprehensive, Naruto accepted Kiba's word at face value and the two went to the table as previously intended. Kiba began shuffling, deciding they'd be playing poker, saying "Alright this will just be basic Hold 'Em."
"Okay, what are we betting?" Naruto asked.
"I dunno," Kiba said laying down the hole cards.
"...How about clothes?" Naruto suggested after a pause.
"You really wanna play strip poker?" Kiba asked.
"What's the big deal? We're both guys so it's not like it'll be weird or anything," Naruto babbled, praying he hadn't blushed.
"That works for me," Kiba said confidently "I just meant you've only got one piece of clothing before you bust."
"Oh...uh...maybe I'll go see if my stuff is done," Naruto said beginning to stand.
"Sit your ass back down Uzumaki," Kiba barked "you don't get to propose a strip game than go put clothes on!"
"But, but, but," Naruto stammered.
"But nothing! I-" just then Kiba's body let out a load groan and his eyes appeared to glaze over.
Startled after his previous episode Naruto asked Kiba "Are you sure your ok?"
"Mmm, definitely," Kiba said with a pleasured moan before the room became filled with all kinds of cracking and stretching noises. It took only a moment for the pair to see what was happening as Kiba's body began gradually rising higher. Naruto stared dumbfounded at his friend as the dog ninja couldn't help but pant with the pleasurable exertion he now felt. Kiba's bones were continuously cracking and warping, creating new space for his new frame, as his skin audibly stretched out to meet it's new demands, and his muscles appeared to be in a constant state of "pump" as more and more bulk loaded itself on his already sculpted physique. Before long a new sound joined the cacophony of growth as his clothes began to groan with tears of defeat as Kiba's shirt began to split up the back. His shorts fared only slightly better because of the material, but when the inevitable tear came Naruto learned his former classmate preferred to go commando as the split grew and grew until the pants simply fluttered to the ground. Now exposed in all it's glory Naruto got a look at the beast that had made quite an...impression in the sweatpants he now wore as it continually lengthened and thickened, benefiting both from the pill's effects and Kiba's arousal.
When the dust settled and the growth ceased Kiba stood and appraised his new body, feeling the freshly blossomed muscle and brushing aside the tatters of his shirt. "Oh yeah..." Kiba purred running his hands all along his new body, coated head to toe in a generous amount of hair, and taking stock of the fact his head was just shy of the ten foot ceiling.
Realizing he'd been forgotten Naruto sat for a moment similarly admiring Kiba's daunting new stature as well as deep down finding he had something that felt like...appreciation maybe...but far stronger for his friend's new visage. Another minute had passed before Naruto cleared his throat and joked "So I guess that let's you out of the game?"
Startled, Kiba looked down to his companion and in a rush remembered his surroundings. "Guess so," he admitted "but I'd say we both won on this occasion."
"No shitting..." Naruto said plainly.
-----
That evening Kiba had, understandably energized, insisted on cooking for Naruto and wasn't taking no for an answer which suited Naruto just fine, he'd already been to Ichiraku's once today and money was a little tight, and whether he'd admit it or not he was more than fine with Kiba's new look and state of undress. When dinner was ready though Naruto began questioning just how grateful he really was when Kiba offered him a plate of...something...gray. After working his way through the meal, all while Kiba devoured three servings for himself, Naruto said, not sure what to do with himself, "Well, I guess I'll get my stuff and head out..."
"Nonsense!" Kiba rebutted "You were probably gonna stay over anyway so why should you go home?"
"Well I just thought that after all the...that you would..." Naruto floundered "Besides you probably are sick of having to be...you know...of being...well..."
"What? Naked? If you haven't picked up on it yet I don't care," Kiba said, gesturing to himself "Frankly I kind of like being naked so I'm good as long as you are."
"...Oh...than...I guess...there's no problem," Naruto concluded, his heart fluttering involuntarily, "But I probably should get my stuff out of the washer by now."
"Sure, you know where it's at right?" Kiba asked, not needing an answer, as he gathered the plates.
When Naruto reached the Inuzuka's washing machine he was surprised to hear it was still on, and it was grinding rather angrily. Worried for the fate of one of his signature orange outfits Naruto opened the toploader and was instantly made aware of the problems the machine had been facing. "YO DOGBREATH!" Naruto shouted angrily as he stormed back to the dining room, soaked belongings in hand "Care to explain this?!" he fumed producing the tattered remains of his clothes.
"Uhh....." Kiba said taken aback.
"Uh nothing! You put my shuriken holster in the wash!" Naruto ranted.
"Oops?" Kiba offered.
"Yeah "oops," Naruto fumed, "that was one of my favorite jackets!"
"Don't you have...like...a ton of them?" Kiba asked.
"That's not the point..." Naruto huffed, finally cooling down after blowing off some steam.
"Well if you really want I'll be you a new one short stuff," Kiba teased.
"Watch it!" Naruto snapped, coals stoked anew "You may have gotten taller, but I can still knock you on your ass!"
"Yeah, yeah, you're a little badass and all that," Kiba jabbed again.
"What did I just tell you?!" Naruto said shortly.
"But you're so cute when you're mad," Kiba poked the bear again, "besides it's late and I want to get to bed."
"Oh, well I'll...I'll uh...I'll just crash on the couch..." Naruto said having lost his wind.
"Nonsense!" Kiba boomed. "My bed's big enough for both of us," he said, knowing it wasn't.
"But I. I, I, I..." Naruto stammered.
"Enough of that, come on," Kiba said dragging Naruto behind him. When they got to the room Kiba began kicking litter around to clear a path to the bed before turning to Naruto and, having made up some schtick to fuck with his friend, said "The only rule in Kiba's room is that no one's allowed to wear more than Kiba." Naruto promptly turned bright red but before he could argue Kiba stopped him saying "Now no arguing. Here I'll even help," and he actually did dare to start pulling down Naruto's pants.
".....you know I could knock you out for this....." Naruto mumbled.
"Then why haven't you," Kiba teased, before leaving his friend just as bare as himself. "See you think this is just as fun as I do," he chided when he found Naruto completely erect behind the sweatpants before showing of his own boner.
The two then clambered atop the bed that was barely large enough to hold Kiba let alone Naruto and were pressed together as tightly as could be...