Big Boy Undies: Long Johns

 

 

 Johnny pulled up his father’s thermal underwear, long johns, his dad had called them. Johnny’s dad was a very prim and proper kind of guy, though he never expected that of Johnny. If he ever found Johnny in his wardrobe, he always gave a big laugh and snapped a photo for the scrap book.

His dad’s dress shoes, watches, and suits were all nice, but nothing got Johnny ever as curious as the long johns. One particular winter his dad had put them on, and Johnny’s mind was spinning, as to why he’d never seen them before. To Johnny the long johns were sort of the pinnacle of his dad’s outfit. Even if it was only in the winter it looked like what a prim and proper man wore even if it was hidden under layers. 

He HAD to wear it too.

But while Johnny’s dad didn't mind his outer clothes being worn, he was a firm no for his undergarments. Why? He never gave a reason, but Johnny hadn't cared before then. Which meant Johnny’s dad was perfectly unassuming when his son snuck in his room to try on the long johns.

The world shifted ever so slightly. The Johnny who put on his father’s clothes was not the same as the one fastening them. In the seconds it had taken him to slide them up Johnny’s body had undergone a change. Several decades had descended and taken root within him. His legs made the clothes stretch to his form, as he began to grow. Years of athleticism worked its way into his legs then up his body. His body thickened, muscularity gluing itself to his expanding frame, matching his father’s with every passing second. The wingspan of his back was determined by his traps, navigating his shoulders further apart as he developed a thicker neck. Next his shoulders and arms refined themselves as small strawberry blonde hairs took over his forearms. Pecs emerged prominently, as proud as his own fathers, as a deep valley cut down his body into his abs. Johnny’s naturally messy hair reworked itself in a perfect mockery of his father’s clean-cut style. Stubble grew along his elongated face, forever solidifying its new permanent visual status.

Johnny’s father slowly woke up to see his younger brother, wearing his long johns. “What are you doing? Can you please let me get some more sleep before you start being a menace?” He turned back to bed. “And don’t steal a watch on the way out!”

—

 

Jonathan never spent much time with his older brother. The two had a wide age gap and only seemed to communicate with each other through presents sent to and from their mom’s house. Even then, the communications weren't that frequent. All that to say, Jonathan didn't get much from his brother. But on one particular day, Jonathan found himself having inherited a lot more than he ever thought.

The day was ending normally enough, Johnathan’s mom had left a gift on his bed, while she went to her job's night shift. The boy was freezing, winter in their apartment got awful, he had a robe and still shivered. He was cramped in his tiny room, which was little more than a glorified closet, but it was less space to heat. Johnathan tore the box open, finding weird pants and a note from his brother sitting on top.

Hey little bro, found these at a market here in Cali. These are long johns made with alpaca wool or something? Have you ever heard of long johns? Just another name for thermal underwear. Which is underwear for the cold. The old lady selling them promised they'd keep me warm. Which I know, why buy them in California? She was nice but also kind of creepy. Hard to turn her down. Regardless, gave it a try, I didn’t like it, but maybe you will. Bet you’ll get more use out of them in your state. You can hang on until you grow into it!

Love,

Paul

Jonathan held up the long johns. He couldn't quite get how these were supposed to pass for underwear. Also, they looked like they were for a giant, especially in his hands. It looked like the underpants wanted to swallow him whole. How big did his brother think he had grown? As ridiculous as it seemed, he felt compelled to try it on anyway. As Johnathan slipped them on, they fit perfectly.

Somewhere between seeing them and wearing them they had shrunk. Paul had been right about them being warm, Jonathan was getting toasty in them alone. Then he broke out into a sweat! His body’s temperature climbed rapidly as his body pulsed and sent waves out through the air, distorting the world around him. His body pulsed in tandem with his heart's strong quick beat, each one changing his figure. Jonathan’s body expanded larger, taking up more space in his room. He was getting older, wiser. Spilling onto the scene first were heavy pectorals wanting to show. His abs and arms weren’t far behind developing just as quickly. The height kept piling on, with no signs of stopping. When his jaw cracked, his mind began to alter. Not erased, just added too.  Memories, knowledge, even his thought process, all added to. His old face was defeated by the masculine one rising to the surface. Dark heavy stubble broke out across his face, to form a beard.

Jonathan’s ass widened, packing the underwear in the back fully as his thighs easily carried the same determination into the rest of the legs. Then his bulge plopped out, weighed far heavier than it ever had been and showed no signs of reversing. An itch came at the center of the pecs before it broke out across his torso, dark curly hairs escaping, as he gained a full pelt. The chest and the hair were his own but also looked familiar. A vision played in his mind: His older brother, Paul wearing the underwear around his house. Unfit for California, the underwear did nothing but prepare for its use. Paul was suitable and produced immense heat on his own. It milked John, at night infusing his seed into its being as some form of storage. The form Jonathan was taking was indeed his own, but very much channeling his older brother’s genes by way of the underwear.

Jonathan roared, as the realization hit and flooded his underwear, soaking them in his cum. By the time he recovered there was no wet spot to be found. He stood up in a much larger room, a different layout and design entirely. A smile crossed his lips.

He was no longer cold.

—

 

Jon, or John-John as his parents called him, had it tough. He knew his dad had grown up in a rural area, not quite Amish country, but more communal than a farm. However, that didn’t paint a clear enough picture of what that meant. Well, when Jon’s uncle, Mick, his dad’s older brother, got married that meant they were on the road for a wedding. Not Jon’s mom though, she understood what he had to do, but she was pregnant and not straying far from a hospital. Fair.  They arrived at the dead of night, Jon freezing, while his dad swiftly unpacked their bags. He shivered as his dad moved unbothered and he wondered how. Mick gave them a quiet late-night greeting, showing them to their room.

The rooms were warmer than outside but not by much. Jon wasn't exactly happy he had to share it with his father. Two beds but even the sheets were ice cold.  His dad, on the other hand, was already taking his clothes off, tossing them on a chair. He stripped down until he only had undergarments on.

“Uh, what are those?” Jon asked, befuddled by his dad weird underwear choice.

"They’re just long johns,” His dad chuckled, then stared as his son wasn’t laughing. “Have I never got you long johns?” He clapped his head. “It’s a must have out here away from the city.”

“You don’t say.” Jon rolled his eyes.

“Look, I’ll ask my brother if he’s got any spare in the morning, but the sooner you hop into bed the less cold you’ll be,” he said getting into bed himself.

Jon relented crawling into bed, temperature dropping rapidly before his sheet captured his body heat. The morning after, Jon woke up with thermal underwear at the foot of his bed. He raced to put them on.

And then it all changed.

He grew and grew. A full life of the rural life settling into his body just as with his extended family. The beard was a staple that forced itself onto his body growing out as strong as his own father and uncles. He was large and none of his clothes fit. Not that it mattered any more. His body was running hot. He came downstairs finding his dad and uncle eating at the breakfast table.

“Long Johns look good on ya, Jon!” Mick laughed.