Lisa woke with a start. She felt something wet and cold against her nipples and in her pajamas bottoms. She groggily opened her eyes to be greeted to two large wet spots in her pj top right over her small pink nipples. 
"Oh no... Not today" 
She sat up slowly the wet cloth sticking uncomfortably to her skin. Her pants were soaked as well around her crotch. It looked like she wet the bed but there was no pungent smell of urine. Her sheets had been spared the brunt of the wetness with only a small spot had appearing near where her bottoms had touched it.
It was getting worse. She had to deal with this, and deal with it now. 
Slowly she swiveled our of bed, carefully placing the sheets to the side in an effort to spare them any further hydration.
Her pants clung to her girlish narrow hips as she slowly got onto her feet. The sagging slightly as their wet weight attempted to drag them off her slender frame.
Lisa knew what was coming. It was thankfully a weekend but it didn't lessen her panic. She had to get out of sight, away from people.
Carefully she peeled the wet garments off. Her nipples felt raw and agitated as she pulled and struggled to take her top off over her head. Her pants dropped much easier with a wet thump onto the floor. 
Lisa stood naked in her room as she weighed her options. Her older brother and younger sister probably weren't awake yet so she had to do this quietly. And fast.
She put on some baggy clothes, comprising a much too large pair of tightly cinched sweatpants and a xl  shirt she had "acquired" from her dad.
Slipping on her shoes Lisa tiptoed through the upstairs hallway as the old boards creaked and groaned, making her wince. Her heart was going crazy, she could feel its thrumming in her head. She didn't know if it was the sneaking or what was coming, either way it only added to her panic.
Finally making her way downstairs she exited out their front door and began to run, she had to get far away, far enough that nobody could hear or see her. She knew just the place. 
The neighbors barn almost half a mile away was her regular place for this. It never got any easier, but at least she had the routine down pat.
Bursting into the structure she quickly closed the enormous and slowly rotting wood door behind her. It was coming, she could feel it in her bones. Goosebumps dotted her arms and back of her neck as she actually began to anticipate it.
Running to the ladder to the hay loft she began to climb. A shock like lightening ripped through her body and she fell backwards off the ladder onto the thankfully well-crushed floor of hay. 
No! It was too soon! It shoudnt happen like this! 
Lisa moaned as she felt her body begin to heat up. The heat came from somewhere deep below the pit of her stomach. She didn't know what it was called or why it felt like it did but it always started there. 
The heat grew and grew and became a fire. Coursing through her body, her heart pumping it to every corner of her being. 
Struggling back to her feet she tried to once again climb the ladder. But the heat was too much, it was numbing even the feeling in her hands, making it too difficult to ascend. She leaned against the lower rungs as she felt a renewed wetness appear between her small vaginas lips.
Lisa wrapped an arm around one of the steps as her knees almost gave out. She moaned as the wetness began to cause her virginal nethers to throb. It never happened like this, she didn't know what to make of the feelings thrumming inside her.
The sweatpants began to moisten around her crotch as she shuddered against the ladder. A growing wet spot in the front of the baggy pants was forming as she struggled to reestablish control of her extremities.
Even through she was feeling slick down below she noticed that her chest was starting to feel odd. Like a balloon filled with too much water her small budding breasts began to swell. She felt the wetness between her legs increase as her bosom began to blossom. 
Moaning Lisa wrapped her arms harder against the ladder, squishing her swelling breasts into the rough wood. temporarily relieved the increasing pressure.
Lisa's body began growing, it was as good choice to wear such baggy clothes. Her butt began to pile on fatty tissue as it ballooned into two perfect bubbly cheeks of flesh. Her pants taking her posteriors expansion in stride as they tightened around her crotch. 
Her fleshy behind bounced as she began to grind her hips instinctively in the air. She felt something building inside her. It built and built as she felt her cheeks flush hotter and hotter.
With one hand she grabbed and stretched the thick gray fabric of the pants taught, forcing the pants to rub her hot crotch. She plied and pulled at the fabric frantically as she felt her sensitivity peaking, every touch of the rough fabric against her lower lips was electricity up and down her body.
With a quietly lusty low moan she came into her pants. She clutched at the ladder with all her right arm as her legs gave way under her. Her small pussy straining its liquid through the crotch of her pants. The liquids viscous heat dripping slowly down her right leg.
She couldn't catch her breath, she felt strange muscles inside her spasming, opening and closing in tune with her catching breath.
When it was over she collapsed backwards into the hay. It was no use, she couldn't get up there, she would have to ride this out at ground level this time. At least her amble buttocks had cushioned the fall she thought to herself.
Staring at the barn roof her breasts continued to swell. Soon her bosom was sporting real cleavage. Her growing boobs pressed against her thin arms as she clutched her midsection, still riding the fading aftershocks of her orgasm. The sweatpants clung wetly to her vagina , it's fabric sinking into the crevices between her crotch and her legs.
As she squirmed in discomfort her dads shirt began to tent in front of her eyes as her young breasts grew. Her hands abandoned her wet nethers as she moved them up to her chest as she clutched her throbbing mounds. 
Lisa's budding breasts were sporting real cleavage now, her breath caught with every growth spurt as they heaved bigger and bigger in their plaid prison. 
She couldn't see what was going on in the still tightly buttoned up shirt but she could feel it. The sensation was incredible as her breasts became heavier and fuller, their weight making itself known on her chest as the skin stretched around her nipples.
All too soon her chest began to reach the limits of its confinement, she was having a increasingly hard time seeing over the peaks of her plaid-covered chest.
Her chest was beginning to hurt again as it was constricted by their buttoned up plaid prison. The thin cloth wrapping around her throbbing heaving mammaries, outlining their voluptuous curves and increasingly aching nipples.
Lisa rocked side to side, causing her breasts to heave left and right. She could feel something inside them moving around as her chest began to split the buttons of the shirt. 
She screamed as her breasts felt ready to explode, their creamy white flesh was pressing through every nook and crevice they could in the shirt. The buttons stubbornly refused to give.
Fumbling with the buttons she struggled to get the top most one undone. Her fingers weren't working right and everything was hot and throbbing in her body.
With a loud pop the top button finally came loose along with 3 or 4 others, sending some flying into the air as her breasts burst into the warm air. 
They were bigger than they had ever been. When this started they were just the size of small apples, still substantially larger than her normal ones. In the following months they had only gotten to the size of oranges. Small but firm. But now she was staring at two slightly smaller than cantaloupe sized bosoms. Their heft rose and fell with each breath. Each composed of taught milky white skin leading to a small pink nipple perched on a mountain of sensual flesh.
More out of curiosity than lust Lisa began to handle them vigorously with her hands. Her fingers tracing lines around her nipples and feeling the firmness and heft of her left and then right boob. They were enormous! She had no idea why hey had gotten so big, they looked totally wrong on her childish frame.
Each stroke of her breasts made her feel funny inside. She could feel her heart almost skip a beat as she moved her hands up and down the sides of the globes. 
She got a bit more adventurous and began to squeeze and knead her breast flesh with her small hands. She stared feeling wet again down below, deep inside. She liked this feeling, liked it a lot!
Almost by accident she swiped over her right nipple. It sent electricity right through her, causing her to temporarily arch her back as she felt a indescribably amazing heat course through her.
She was extremely slick between her legs now. Her wet cold pants were refilled with hot new liquid, dripping out of her crotch. Lisa braced her hands onto the floor and propped herself up against a thick wooden beam. She wanted to see this.
Sitting up caused her ample breasts to descend, but not as much as she had thought they would. Their firmness caused them to remain almost unnaturally aloft on her small frame. It was hard to bring her arms to her crotch, her breasts were too large and their flesh pushed against her arms furiously.
Still she tried to reach her sopping wet crotch. She wanted to get the now soaking wet pants off to see what was going on down there. If she even could at this point as her dual mountains of breast flesh were blocking her view of almost everything but her wiggling toes. 
She gasped as her heart began racing again, she was going to cum again soon at this rate. She had to get those pants off! Furiously she reached for her crotch, squeezing her boobs together causing her to shudder in pleasure. She kept at it, deepening the already ample cleavage she sported in an attempt to reach the drawstrings of her sweatpants just below.
She arched her back again as another wave of pleasure hit her, this time not just localized to her crotch but her throbbing breasts. Each of her nipples had elicited a small dew bead of liquid. She brought a finger to her left breast and wiped it off, causing even more pleasure to ripple down her spine.
Grappling both of her small nipples she began to stroke and lightly pinch their hard pink nubs. It was ecstasy, almost too much for her to handle. Her small nipples were rock hard and throbbing in their own right. They strained and strained, harder and harder, eliciting several more drops of whitening liquid. 
She screamed as she came again, her hips bucking involuntarily as her nipples thickened and elongated to almost a half inch long and as thick as a pencil eraser. Twin streams of the liquid shot out of her engorged nipples as she came.  Back arched, her ample tits aimed into the air as the columns of white liquid landed wetly on the wooden floor a few feet away.
"Huuuahhhh...huuhhhhh" was all she could get out of her mouth as her nipples leaked small rivers of liquid down under her boobs onto her stomach and right into her even more soaked pants. 
Her body wasn't done yet, even though she was exhausted already. She knew there was more coming, but she was unprepared even by past experience for what was about to happen.