Bulking

Too eager to wait or reconsider, Thunderlane opened up the tome as soon as he had gotten back into his room. It was summer so Rumble was in Cloudsdale with their parents, so without fear nor inhibition he began to read. It was...strange. In place of words were almost pictographic characters depicting what appeared to be bulky dudes in various poses. As his eyes slid over the images they lit up, and he felt a little ball of excitement well up inside his stomach. Scanning each page Thunderlane had lit up the entire journal sized book. He looked at his nightstand clock to find that it was nearly 3:00 AM. With tired eyes he fell sleep, and the image of him on the cover of the book began to shift...

Thunderlane woke feeling refreshed and lively, and tried to roll over to look at the time. He was met with a bit more resistance than normal, which caused his eyes to flash open and look down. He pulled the sheets away to see a large barrel chest beneath him and a rounded out gut with just the barest amount of definition. He tried to right himself and found that his new football sized biceps easily pushed his bulk into a sitting position. He started patting down his body to check if it was real. Thick masculine hands explored the changes; from the full and somewhat bouncy pecs to the drum-like muscle gut to the bulging spheres of his biceps and quads.

After a moment of slack-jawed awe he couldn't help but begin giggling like a filly and leapt out of bed. He bounded to the bathroom, feeling his heft cause his steps to resound loudly. It was only upon getting to the mirror he noticed that his muscles and weight were not the only things that had expanded. His shorts looked almost painted on and were straining against a bulge far larger than he had been endowed with only the night before. Stripping the now obsolete shorts off he couldn't help but smile goofily as a sixteen inch cock sprang ro attention, accompanied by balls the size of grapefruits and about as ripe.

He did his best to assume several strongman poses in the mirror, despite having no experience with them. It wouldn't have looked half bad if it were not for the fact that instead of a stern expression he had the look of a colt opening his first Hearth's Warming gifts; a smile as wide and full of wonder as there had ever been.

He stammered out, "Omygoshomygoshohmygosh I-I-I'm HUGE!!! I-I can't believe it! That crazy book worked! I almost thought I was going to wake up a newt or something freaky but it did exactly what I wanted and i'm so big and sexy and and..."

His muscles tensed and he involuntarily flexed, seeing his whole body bulge as he felt a warm rush through his groin and noticed that he just blew his load all over the bathroom counter.

He sighed, "Aaaaand now I have to clean my bathroom. Great. I'm going to have to be more careful...but just look at me! I've gotta get to the gym ASAP to show off a bit. I wonder what I bench now!"

Leaving the sticky countertop for later he lumbered to his closet and tried to decide what he would wear.

He rambled, "My mesh top won't fit anymore...I'm sure I could get my shorts on still. Oh! That crop top I bought on a dare will work perfectly..."

He strutted out of the closet wearing workout shorts that hugged his quads tightly, outlining his package not-so-subtly and giving a nice shape to his muscled bubble-butt. He had slight love handles that drooped over the edge of his shorts, but his gut held firm and jutted out several inches from his chest. Looking more like a sports bra than a crop top, the black piece of attire clung to his pecs and he was fairly sure that if he flexed hard enough he could create tears in it. Scribed across the front in simple white font were the words "BIG BOY".

Slipping on his shoes which thankfully still fit he strutted out into the light of day. He spread his wings and noticed that he must have gained a foot or so of wingspan. Was there anything that book didn't enhance? Using his powerful chest and shoulders he launched himself into the air far faster than he would have though possible with his bulk. However, as he tried to turn towards the gym he noticed he had lost a lot of his turn radius, taking a wide arc. In but two minutes he landed on one knee in front of the gym with a sound much like his namesake, the force of his sudden descent rattling windows and causing all nearby to stop and stare. He stood up and with a smug grin brushed off his shoulder and walked into the gym.

At first no one paid this new Pegasus much mind, but then the gym regulars started to recognize Thunderlane and his new brutish form.

"Damn dude did you eat Snowflake?"

"Finally took my advice and started creatine, eh?"

"I knew you were bulking man, but you might want to cut back before that gut pops. You look tight!"

Strutting over to the bench press he stacked on 500 pounds and decided to see what this new body of his could do. With surprising ease the he began pumping the weights, feeling his chest expand with each movement and breath. This is what power felt like!

"Well partner, looks like someone's been eating well."

He set the bar back into resting position and looked over. Big Mac, in all his swollen glory was standing over him in only a set of workout shorts.

Thunderlane rolled himself off the bench and stood up. His dick chubbed up a bit when he noticed that he actually looked a fair bit bigger than his idol. He then noticed that Big Mac was waiting for a reply from him and said,

"Heh, yep. Started a new diet I found. Seems to have finally worked like nothing else did. What do you think of the new gains?"

Big mac let out a booming laugh and said, "You look fantastic! Welcome to the big leagues, took you long enough!"

He slapped Thunderlane on the back and he had to struggle to keep his boner under control. He hoped it wasn't so obvious...Wait... yeah he was big now and loving it, but why was Macintosh getting such a rise out of him? He wasn't so competitive that he would get a hard on from surpassing his friend, was he?

"I-I have to go. I just remembered I-I left the oven on."

Almost punching himself for his uncreative response he ran out and launched himself into the air, turning back towards his house as best he could. If he had taken a sharper turn an unlucky passerby might have felt a single drop of sticky pre land on their forehead because a quickly expanding stain was forming on his shorts.

Arriving at his house he walked in and locked the door. He was at half mast now and ripped off his shorts. He couldn't help but think of the way Big Mac's hand felt on his thick back and suddenly sprung into a full on rager. Slamming himself into his sofa he started stroking himself as fast as he could. His chest muscles rose and fell with every short breath and his involuntary flexing caused his gut to expand out and back with every pump of his meaty hands. He was producing a steady flow of pre, lubricating his efforts as his biceps twitched and he stretched out his legs.

Why? Did he really compare himself to Mac that much? How much of his desire to grow was built around being w...bigger than him. All the confusing thoughts and chaos in his mind was washed away with the electric flood of sensation as he blew his load for the second time that day. His balls slammed into him fully this time and he arched his back, stretching out his poor tight skin and letting out a moan so loud his neighbors would have to be deaf to have not heard. The spray launched up and the very top of the arc splattered the ceiling a bit, before the majority landed all over his television screen. Confused and strangely exhausted, he passed out on the sofa. Unbeknownst to him, the cover of the book in his room shifted once again as the text inside flared with power...