I'm a British guy in my early 20s, your standard introvert with short brown hair and an average body, though I've been getting into working out and I hope it's starting to show a little bit. I usually wear trunks or boxer briefs as underwear (usually black, grey, or navy) since they're comfortable and look pretty standard. Quite a few of them are wearing away so I need to buy more. My phone must have been listening to me or something because it opened up this mens' underwear site and a popup came up saying it would send me a 'life changing pair'. All I had to do was upload a picture of myself just in my normal underwear and they post me a surprise new pair picked out specifically for me, where they pick the type of underwear and the colour. Apparently, I get it for free so long as I send an 'after' picture of myself in the new underwear they send and leave a review. Well I can't say no to free stuff... So I sent a picture in my standard underwear and in the next few days the package arrived. I wonder what they sent me?
The package arrived after three days.
He, a twenty-year-old British guy, with short brown hair and an average build, took it from the postman with a mixture of curiosity and embarrassment. He had almost forgotten about that website. That pop-up that had appeared magically on his phone. "A pair of underwear that will change your life." He had uploaded the photo in his black underwear, the old and worn-out ones, and they had promised him a free pair. In exchange for an "after" photo and a review.
It seemed like a joke. And yet the package was there.
He opened it in his bedroom, with the curtains drawn. Inside, a pair of gray underwear. Dark gray, almost charcoal. Thick, soft fabric that seemed almost rough to the touch. Simple. Masculine.
He took them in his hands. The fabric was warm. Inexplicably warm.
A tingling ran through his fingers. The fabric seemed to vibrate.
A thought crossed his mind: Try them on.
He didn't think twice. He took off his worn-out black boxer briefs. He put on the new ones.
The gray fabric clung to his hips. Perfect. Too perfect. As if they had been custom-made. A sensation of warmth spread from his lower abdomen.
Then it began.
An itch. Insane. On his chest, which had been smooth before. He scratched himself, but the itching got worse. He looked down. Hair was sprouting on his chest. Thick. Dark. Coarse. Growing before his eyes. Scattered at first, then increasingly dense, covering his entire chest.
"Ah... ahh..." He moaned, his voice cracking.
The gray fabric began to tighten. He looked at his thighs. The muscles were swelling. His quadriceps were exploding, his calves widening. The fat on his legs was melting away, replaced by hard, dense fibers.
His back arched. His shoulder blades snapped into place. His lats swelled like two wings.
His hands grabbed the edge of the bed. The bones in his fingers cracked, widened, his knuckles becoming thicker. The tendons emerged like ropes beneath the skin.
His jaw widened. His chin became massive. His forehead lowered, his eyebrows thickened. His nose widened. His teeth clenched.
"Ugh... AH!"
A deep moan. His voice had changed. It was lower, rougher. Almost animalistic.
The hair spread. On his arms. On his legs. On his chest. Thick, coarse, dark. Covering his skin like fur.
His shoulders widened. One meter. One meter and ten. One meter and twenty. His collarbones snapped into place. His arms became trunks. His biceps exploded, his triceps swelled. The veins surfaced, thick as ropes, bluish beneath his now-taut skin.
His chest rose. His pectorals became two massive, heavy shields, covered in thick dark hair. Every breath made them rise and fall.
His abs emerged. A wall of hard flesh, eight squares carved beneath the hair that descended from his chest to his pubic area.
His waist narrowed. His buttocks exploded, two hard and massive spheres.
And his penis. He felt his penis grow. Swell. Lengthen. Become thick. Massive. It pressed against the gray underwear, forming an enormous, heavy bulge. The fabric stretched, almost tearing.
"Ah... fuck... AH!"
One final jolt. His entire body contracted. His muscles tensing. His spine snapping into place. Sweat pouring in streams, copious, hot.
Then silence.
He was still sitting on the bed. But the bed seemed smaller.
He looked at his reflection in the window. He was enormous. He didn't recognize himself.
Broad shoulders, a massive, hairy chest, thick, veiny arms, legs like columns. His face had changed. A massive jaw, a low forehead, a glassy stare. His brown hair had become darker, thicker. A beard had sprouted on his chin, unkempt, bristly. He looked like a thirty-year-old man. A Neanderthal. A modern caveman.
His skin, once smooth, was now covered in hair everywhere. Chest, arms, legs, back. Thick, coarse, dark. He looked like a beast.
He stood up. His muscles were heavy. His body was too large. His hands, which had once been normal, were now paws. Thick fingers, broad palms.
"I... I'm..." His voice was low, hoarse. "...big..."
He looked at himself in the mirror. He raised his arms. His biceps swelled, monstrous. The hair under his arms was thick, black. The smell of sweat filled the room. Strong. Masculine. Animalistic.
He touched his chest. The hair was coarse, bristly. The skin underneath was warm, stretched over the muscles.
A thought crossed his mind. It wasn't a complicated thought. It was simple. Primitive.
I'm strong. I'm big.
He touched his bulge. It was enormous. Heavy. His hand could barely wrap around it. A rush of excitement ran through him.
His brain seemed slower. Words were difficult. But the muscles. The muscles were everything.
He looked at his face in the mirror. The unkempt beard, the dull eyes, the massive jaw. He was stupid. He knew it. But he was strong.
"I... I like..." He mumbled, with a silly smile. "I like being big."
A loud, guttural burp escaped him. He laughed by himself, like a child.
He felt his phone vibrate. A message. He ignored it. There were more important things now. Like looking in the mirror and watching his muscles contract. Like touching his hairy chest. Like smelling the scent of his sweat.
The introverted boy was gone. Now there was a man. A man of muscles, hair, and little brains.
And those gray underwear, clinging to his new body, were the most comfortable he had ever worn.