To share in a good time with his best friend, of course!

(It's my first time posting to this site, so I thought I would contribute instead of lurk for once. Hope you all enjoy!)

You sigh with relief when Sam scribbled in the notebook once again and the walls stopped flashing with every color of the rainbow.

"I've only tested it out on Jenny before you showed up, and after that I decided that I need a partner in crime in case I screw something up." Your short but bulky best friend said, his form-fitting black T-shirt and jeans straining against his defined concrete muscles. "And who better to share ultimate power with than my bestest of bros."

Wow, you thought to yourself with a mind-blown grin. What a guy Sam was. If the shoe were on the other foot, you wouldn't be too sure if you would've invited Sam to do the same.

"Dude, this is fucking awesome! You're the best." You said, laughing, having dismissed your previous exasperation towards Sam. Then, you remembered what he said about a test. "Wait, what did you do to Jenny?"

For as long as you can remember, Sam's eighteen-year-old sister was as normal as they come. Decently pretty, shortish blonde hair, a thin body, always naked, big jiggly breasts that were the size and shape of bowling balls, begs everyone to suck her dick.

"Nothing crazy." Sam said as his handsome face became a lighter shade of pink and a nervous smile appeared on his lips. "She just used to be chubby."

"Oh, alright then." You say with a shrug. "It's weird not remembering that."

"Right? I'm still trying to figure out what I did to myself a second ago, but its like I was writing with a pencil without lead."

"Guess you'll just have to be careful, then."

"I think you mean, 'we'."

"Bro, again, you're awesome."

"Don't I know it." Sam said, glowing with pride as he flexed his powerful muscles and rolled his thick neck. "So, what do you want to do first?"

"Shit, I don't know..."

Looking down at your average and slender self, there were plenty of things you wouldn't mind changing. Hell, part of you wanted to be a taller clone of his handsome best friend, but you were nervous about jumping to something so **** right away, as tempting as it was.

"I guess I could use a few extra inches down below."

"Big dick?" Sam laughed, turning away to write in the notebook. "I can get behind that."

John and I have thick foot-long cocks with huge balls to match. We are both aware of this change.

As soon as the last period was added, both you and Sam let out a grunt and gasped.

You were too busy looking down towards your own crotch to notice how the material of Sam's dark jeans seemed to change into something more elastic, allowing a softball of cockmeat to bulge out between his musculature thighs.

Within your green basketball shorts and snug briefs, you watch as your average-sized dick soon became very noticeable in its confines as it swelled down your slender thigh. The powerful and very pleasurable sensations caused you and Sam to sharply moan in that very brief moment, and soon you both were sporting cocks that would put most any pornstar to shame.

"Bro..." You said, looking down at your bulging and twitching package with awe as it slowly continued to grow and harden from arousal. "This thing might be too b-"

"Bro!" Sam said as he leapt out of his chair and quickly undid the front of his tight elastic jeans and pulled down his tighty whiteies.

A half-erect tube of flesh flopped out in front of him, and the bulky twenty-year-old wasted no time in wrapping his meaty hand around it to give it a few strokes, his outrageously big tennis-balls swinging around below.

Part of you wanted to turn away at the sight, but the other part that was much more excited about your situation decided to follow suit and yank out your own giant dick.

And soon, there you were, standing around with your best friend in the middle of his room, both of you laughing and jerking yourselves off. It started as a quick experiment, just trying to admire and get a feel for your enhanced appendages, but neither your hands ever stopped, realizing just how good it felt to be that well-hung.

As soon as you started to cradle your balls as well, you feel yourself edge to climax, and things become oddly real as this snaps you back to reality. Reluctantly, you stop, and your angry hard dick simply twitches as it sticks straight out from your crotch.

You sigh and look at Sam, who was too far gone by this point. The next thing you know, he's slightly hunched over and grunting as thick ropes of cum start firing out from the head of his circumcised cock, covering his messy bed with a coffee-cup's worth of the stick spunk.

You aren't sure if you're more amazed by how long Sam's orgasm lasted, or the sheer amount of cum he and his swollen balls produced. In fact, you're a bit worried by that animalistic look on his open-mouthed and panting face. Exactly how good did cumming with your huge dick feel, you wondered. Pretty good, from the looks of it, but by the time Sam recovers, he still looks a bit shaken.

"Jesus, dude." You say, which actually startles Sam, bringing him back to his senses. "Like I was about to say earlier, I think you might've gone a little overboard, aha."

"Y-Yeah, maybe." He said, blushing, then slowly turned back to the desk where the notebook lay. "Think I should dial us back a bit?"

"... Nah." You say after a moment of thought. "We can always turn them back to normal whenever we want, right?"

"That's a good point." Sam chuckled, sitting down with his still-hard dick sticking out from the front of his undone pants while occasionally glancing over towards your own package with a curious look in his eye. "Still though, wow."

"I bet. You looked like you lost yourself there for a moment."

"No kidding. My head's still swimming."