It was then that Tony's scream reached a crescendo, and the rumbling switched to a pulsing beat. After about ten seconds, the urethral hole seemed to clench, and then a tiny wad of white cum shot through the air and smashed into the wall, cracking it. A second clench was followed by another tiny wad of white cum, which splattered along the ground a good four metres. There were more clenches, followed by more tiny wads of cum shooting out of the massive cock, but nothing like the massive flood that Ben had expected.
After a good minute of this, the pulsing stopped, and Tony's screams died down. The penis seemed to settle, and Ben realised that it hadn't advanced any further since the orgasm began. Walking around the head so that he could see past it, Ben came on the absurd sight of the old man trying vainly to clamber up onto a table in an effort to reach the nearly-comatose Tony. Ben quickly stopped him by shouting at him, and suggested an alternate solution.
The two men quickly turned to face the remarkable dark, fleshy cylinder, and quickly pushed. Ben stifled a laugh as the image of Violet Beauregard from "Willy Wonka and the Chocolate Factory" flashed through his mind. With a great heave, the two managed to slightly roll Tony and his cock to one side. Another couple of heaves, and Ben found himself once again staring at Tony's massive piss slit, this time from a different angle.
The old man quickly dashed around the base of the penis, which Ben noticed had two tiny testicles jutting out from it. Ben started running the length of the penis, only to get winded as he rounded the base. The sight that met him this time was even more bizarre. Two small legs (with jeans still hanging from the knees) were dangling around the edge of the base of the massive shaft, which had a remarkably-stretched anus jutting onto it. The old man's back was visible as he reached up towards the area just beyond where the stretched arsehole began. Ben breathed heavily as he walked around the base and was able to see his friend, Tony, dangling limply from the side of the penis, the old man trying to wake him up.
Even as Ben walked around the old man, Tony's eyes fluttered open, a dazed look clear on his face.
Ben watched as the old man forced Tony to swallow the entire packet of powder he had brought over. Glancing over at Ben, the old man noticed the quizzical look on his face and explained.
"This powder is Normal Powder."
"Normal powder? Why would ordinary powder do anything to help this?"
"No, it's called Normal Powder", the old man explained, "it's a magical powder the restores normalcy. But it's only potent enough to undo what other magical powders do, in equal parts. So if he ate half of this, it would only undo half of the growth."
"So he'd have a penis only half this size?"
"Oh, no. That's not quite how the magic works". The old man elaborated, "The magic works proportionally to what it's working with. Consume a certain amount, and your penis doubles in size. Consume twice as much, and it grows four times as big. I'd estimate that, if he'd had half as much powder, his penis would have been... a little shorter than he is tall. Still absurdly large, but nothing like this."
Ben noticed that Tony's face had that look of disgust again, at having a mouth full of powder. Looking around, Ben spotted the water bottle, which had rolled off to one side during the process, and quickly dashed to grab it. Bringing it back over, Ben poured water into Tony's mouth, and then onto his face. Tony gulped hard, and already Ben could see some changes - the penis was clearly not quite as long as it had been.
Realising it was going to take maybe 10 minutes (about as long as the growth had taken), Ben and the old man leaned against a nearby table and started chatting about what they'd just seen, about what was happening now, and about the other sachets.
It was about five minutes later that the penis was small enough that Tony could shift back onto his feet, the penis still running along the ground (no longer hard), but only a couple of metres along it, and about as thick as his leg. Meanwhile, Ben and the old man turned their discussion to the Halloween party. The old man got a glint in his eye.
"You know, the powders could really come in handy for making some mischief at the party."
Ben smiled. "You're right, it would. We could spike drinks with it, perhaps use a bit as though it was sugar on some treats..."
"... and with the right costumes, we could make it even easier", the old man finished the thought. Ben already had the sense that the costumes would be similarly imbued with magic, and his mind turned to ideas for perfect choices... but the old man had his own ideas, and his ideas weren't nearly as innocent as Ben's.
Tony's penis reached a manageable 50 centimetres, and he was clearly regaining real lucidity. Ben quickly filled him in on the idea as his penis shrank back towards its original 10 centimetres, while the old man headed into the back room. He knew just which costumes to give the two guys. They weren't going to get a say in it, because the old man was really...