Three boys at a sleepover
Only one is trying to sleep, and the other two are waiting for this
Soft breaths become snores, telling them it's time
They crawl to the short-haired boy's futon and pull back his blanket
"Aw~ he's so cute," the blond-haired boy whispered, fondling Short's small, flaccid dick, "Should we lock him up again?"
"Nah, I have a better idea."
The black-haired boy held a jar, label reading "Grow Hyper!" (the exclamation point being an ejaculating penis)
"Whoa, where'd you get that?" Blond reached for it, but Black knew better than to give him such power
"The Internet, obviously," Black said, palming Blond away
"Come on, let me do it."
"Fine, but just a little. Uh-ah, use gloves, idiot."
Donning a pair of latex gloves, Blond dipped a finger into the gel then slid it into Short's foreskin
"Don't just put it on the tip. You gotta coat the whole thing otherwise it might not grow evenly."
"'kay, 'kay."
Blond pulled back the foreskin as she stroked down Short's cock, and rolling it between his fingers to apply the coat evenly
"Oh, it's working!"
"Quiet," Black hissed
Blond wasn't paying attention, too distracted by the cock swelling in his hand
At first it only looked like a normal erection, head peaking out from Blond's fist, but they both knew this was already bigger than normal and it hadn't finished growing
Enjoying the novelty of feeling the cock swelling in his had, Blond wrapped his other hand around it to have it once again swell until it the head poked out the top
It was rock hard, veins still gently pulsing against his fingers
There it came to an end at just a little over two of Blond's hand widths (2.5x Short's original size)
"Is that it? Not very 'Grow Hyper' was it?"
"He just had a little dick is all."
"How about we give him some more?"
Black examined the dick
It was a little redder than usual, but had no stretch marks which probably meant it was safe
"Sure, why not- hey!"
Blond scooped considerably more than last time, and to Black's protests he simply held a finger to his lip to tell him to be quiet
As much as he thought this was a bad idea, Black didn't want to argue
Plus he was a little curious to see what would happen
Lathering both hands, Blond stroked the newly enlarged cock
This time he gave ample care to the balls and taint
Short stirred
The growth was a little faster this time, his body already used to it
Blond had barely any time to to play with it, and less time to react to the sudden squirt of precum
It shot across him, warm and slimy
Out of instinct he went to wrap his lips around the tip, but Black stopped him just in time
"Not while it's still active," he said
Precum was still shooting out of it, clearly the gel had seeped into his glands as Blond had hoped
Blond caught the clear loads in his mouth, though most drooled back out before he could gulp it down
"Check out those nuts," Black said
Short's balls had swollen an incredible amount, looking like two fists wrapped in a tight scrotum
His cock had once again doubled in size
A little over a foot long, covered in veins
Definitely not the cute little dick he'd been so fond of (it suited the sub aesthetic he cultivated)
Hyper was still a bit of a stretch though
Blond was eager to suck it, but before he could get his lips around it Black had already done so
"What the fuck, man?" Blond had never felt so betrayed
Black simply shrugged as he throated the cock deeper
The slurping and moaning of his enjoyment added insult to injury
A wicked idea came to Blond
The gel was unattended
Making sure Black wasn't paying attention, Blond scooped up a handful and began applying it to Short
He started from the balls where Black wouldn't notice
The eruption was immediate, noted by Black wretching as he took a gut full of cum
Blond laughed as Black recoiled and spewed up cum
He then paused, realising perhaps he'd gone too far
Blond had been idle stroking the cock, and though the growth hadn't started yet it was squirting ropes like crazy
Short was moaning, tossing as turning as he did so
Black recovered and said, "Idiot, look at the mess you're making."
There was little time for Blond to think
Two solutions came to mind: mouth or anus?
He chose the latter
Squatting over the cock he tried to lower himself gently to it
The growth, however, met him halfway, pressing the tip firm against his sphincter
Cum rushed inside him
So thick warm, so hot
As it continued to grow, the loads got bigger and shot harder
Blond was nearly standing upright, and his ass was nearly full
"H-Help me," he begged Black who had just been watching the whole ordeal
"Sure thing" Black rose and then placed his hands on Blond's shoulders
"What are you-"
"Revenge."
Black forced Blond down with all his weight
Between Black pushing down and the cock pushing up, there was no stopping it
The over-sized cock plunged inside him
It's girth took up his entire colon, forcing the cum that had been there deeper inside
Biting his lip, blond tried to stifle the mixture of a moan and a scream
The cock squishing his prostate had forced an orgasm out of him
For a moment, as pressure subsided, he thought the growth was slowing
Then he realised it was him - his insides growing
The bulge beneath his abdomen looked like someone was elbow deep in his ass
It was only getting thicker by the second, bloating as cum continued pumping inside him
"S-stop! let me off!" he choked out, struggling to find the breath to do so
Black had stopped a while ago
It was the thickness of the cock holding him in place
Now as thick and as long as his leg, the shape of the glans was visible against the surface
Each eruption of cum rippled under his skin
He was bloated to other size of a basket ball
The growing had stopped, but the swollen nuts did not
Black pulled on Blond, stimulating the cock further
"Your anus... is like a cockring," Black grunted
Each pull drew more blood towards the tip of the cock, making the next even harder
As balls deflated, Blond inflated
His belly was as big as a beach ball
A final tug, aided by the pressure building within, Blond popped free
They collapsed into a heap on the floor
The gallons of cum had made Blond considerably heavier
"It's... not coming out," Blond said
What?"
"I'm trying to let it out, but I can't."
Black checked Blond's ass, and saw why
The reason: his anus had grown so much that it had no room to part
He relayed this news to Blond, "Well, it should wear off in a few hours."
"Well, it only hurts a lot, so I guess I'll be fine. Is... he still asleep?"
Sure enough Short was unconscious, hyper cock spanning the distance between him and them
"I think he may be anemic..."
"A-what?"
"All the blood's in his dick, not in his brain. Quick, help me lift it."
It had grown nearly as tall as them, so Black had no chance lifting it on his own
With Blond's help they just managed to get it upright
They massaged it, coaxing the blood to flow down
The club-like shape dissipated rapidly
After a while Short began to stir

Then Black dropped it
It struck Short with so much force it knocked him out
"Whoops"