"If I do it, and nothing happens, you have to pay for my costume. Deal?"
"Deal". Ben nodded, figuring that the sight of Tony swallowing a whole packet of powder was worth paying for his costume.
Tony looked at the packet one more time, and then visibly steeled himself in preparation for swallowing a fair amount of powder. He tore open the sachet, and, just before downing the contents, he paused. A mouth full of powder, even for a few extra seconds, was going to be annoying. He quickly twisted around and pulled his water bottle from his backpack.
He turned back to the sachet and picked it up, once again steeling himself for the mouthful of powder. He raised the packet to his lips, hesitated a moment, and then suddenly tipped the contents into his mouth, a small puff of white powder-smoke rising from the area. He quickly closed his mouth and swallowed hard, his mouth contorting and his eyes squinting as he tried to get as much of the powder down as possible. A sensation of heat seemed to follow the powder down his throat.
He quickly grabbed his water bottle and emptied half of it into his mouth before quickly swallowing again. Ben clapped cheerfully as Tony loudly expressed his dissatisfaction with the taste with a drawn-out "Yeeeeeach". Ben was thoroughly entertained by Tony's facial expressions, as they shifted from 'disgusting taste in mouth' to 'weird sensation in stomach, and then to 'shock'. Tony's dark hands darted to his crotch, which Ben thought was just Tony playing along with a façade of the powder working.
"Holy crap", Tony exclaimed as he felt the heat of the powder shifting towards his dick. He could already feel a heaviness in the crotch area.
Ben punched Tony playfully on the arm. "OK, that's enough. You win, I'll pay for your costume." Ben laughed, failing to see Tony's eyes bulge at the sensations coming from his groin.
"Ben, I'm not pretending, something's really happening!"
"Yeah, sure, Tony. And don't pretend that being hung is because of the powder, I'm sure you're naturally pretty big." Tony was insecure about how small his penis was, and hated it when people just assumed he was hung because he was black. Four inches, hard, on his best day, while people always implied he was much bigger. It only made him feel even smaller... except, it already felt bigger than he'd ever felt it before.
Gritting his teeth at the comment, Tony mumbled "No, really, something's happening". Ben would have dismissed Tony's comments as a fake again, but it was at that moment that the powder seriously kicked into action. Within seconds, the nearly-flat crotch of Tony's pants were bulging obscenely, and Tony started furiously fiddling with the button on his jeans, his frantic need to get his pants off getting in the way of actually unbuttoning the jeans. As the bulge started to strain the pants, Tony was visibly squirming, the button finally finding its way through the hole.
The force of the bulge was strong enough to near-instantly unzip the zipper of the jeans, revealing a bulge in his blue boxers that defied belief, and was visibly still growing. The small button on the front of the boxers gave way, popping off as a mound of dark flesh started to push its way through the slot. Tony's eyes looked like they'd actually pop out of his head, and Ben's eyes weren't much better.
"Holy..." The word seemed to hang in the air for a moment. Ben couldn't believe his eyes. His friend may or may not have been hung before, but there's no way that Tony could have hidden this monster from him. Tony's hands moved down to the exposed flesh, needing to confirm that he wasn't imagining things, that there really was such a prodigious organ growing from his crotch.
The sound of slight tearing brought attention to the boxers themselves, which were now starting to tear under the pressure. The sound intensified, and suddenly the huge dong was fully exposed, the boxers falling slightly to land in the crotch area of the jeans that now hung on at Tony's knees. The penis itself was clearly still completely soft, but was already hanging half way to the jeans. Tony immediately grasped the tool, which was already well too thick to hold with one hand with the fingers and thumb touching. Ben's hand reached out as he, too, needed confirmation that what he was seeing was real.
As Ben's pale hand made contact with dark hose, Tony groaned, and both felt the hose pulse, veins bulging all over it. The force of the subsequent pulses grew stronger, until Ben's hand was knocked away harshly as the tool hardened and rose. Tony was forced to lean back as his centre of gravity shifted, the weight of the penis pulling painfully at his crotch. He could feel his undersized testicles being crushed under the weight, but could do nothing about it.
As the tool continued to rise, the engorged head now at chest level despite still being at a 45 degree angle upwards, precum began to form at a piss slit that was big enough to accept coins. The clear liquid started to roll down the underside of the penis, the sensation from which caused Tony's libido, already over-active due to the situation, to go into hyperdrive. Both hands trying to wrap around the massive shaft, Tony found that, even with two hands, he couldn't completely wrap around it. But he didn't care that much. His hands started pulling up and down even as he tried to pull the unbelievable flesh to his face.
He was only mildly surprised when the head was out of reach above his head, precum now drooling down the topside onto his nose. He licked the dark shaft-skin and shifted to using his entire forearms to stimulate the organ, his hands now nowhere near big enough to handle it. He looked up to watch as the stimulation increased the speed of the growth, the penis now undoubtedly larger than the rest of his body.
Ben, meanwhile, had shifted from fascination to fear, and was already seeking out the old man who ran the store. He glanced over shoulder to see Tony's knees buckle, his eyes twinkling with fervour as he continued to work over the organ that was almost too big to fully embrace.
He turned back, only to slam straight into the old man, who was rushing towards the scene. Ben was knocked back as the old man, who was more solid than he looked, dashed towards the gargantuan dick and the poor guy attached to it.
Tony's eyes rolled back in his head as the weight overcame his strength further even as the head brushed the high ceiling of the stop, and he toppled forwards, the log that was his penis below him, his hands only saved from being crushed by the fact that he could no longer even touch fingers around the organ. His body began to writhe as the still-growing penis slid along the ground.
Ben picked himself up from where he had been knocked as the old man reached Tony, and Ben started dashing, not to Tony himself, but to the head of the remarkable... thing - the head was now almost as big as Ben's entire torso!
The old man was talking to Tony, but Tony was clearly no longer in a state to talk, his weight shifting just enough to start rolling sideways slightly around the humongous schlong. The old man turned and shouted to Ben "How much did he consume?" Ben shouted back the 10 metres or so, telling him that he'd downed the entire sachet. The old man gasped and dashed back towards the back room, shouting "If we don't stop it now, he'll destroy the shop and maybe even the town!"
Ben's fear was giving way to a kind of morbid curiosity. He walked to where the head now was, a good two metres further than it had been [in less than a minute! Holy crap!], and started to look at the massive mushroom. He had to keep edging along to keep it from moving out of reach, but he got a good look at it.
Reaching out, Ben touched the ridge of the head, which was now as big as he was. Tony's groans grew louder, and his arms, now flailing a good two metres off the ground, grasped the penis harder. Ben felt slightly detached at seeing the small black man dangling from the top of the penis that was now nearing 16 metres long and was at least two metres thick and growing. Forced to once again shift to reach the head, Ben's curiosity got the better of him, and he moved across to the piss slit.
Although precum continued to drool from the slit, the volume of it was nowhere near enough to suit the incredible shaft - it was as though his body couldn't produce enough precum for more than a normal-sized dick, and was having to produce that much continuously. Without another thought, Ben reached out to the piss slit, and started to push his hand into it. Tony began to scream as though approaching orgasm, even as the old man dashed back towards Tony's seemingly-tiny body, a small sachet in hand.
The orgasmic scream grew louder as the piss slit kept advancing, consuming Ben's arm even as Ben stood motionless. The entire ground seemed to shudder as Tony's scream raised a couple of octaves, and the piss slit started pulsing around Ben's arm, which was now in up to the elbow. Ben started walking back to keep it from going in any further, but used his other hand to try to lever the slit open. The rumbling grew stronger and Tony's scream went falsetto, and the piss slit started to spread on its own, giving Ben a good view of the opening of the massive urethra - it looked like he could almost crawl his entire body into it!