Kelly was a chubby girl, pale with raven hair and a round face. She wasn't fat, but an utter lack of any real exercise left her jiggly, with thick thighs and a slight belly, ample breasts and a nice, wide ass. Her hair was tied back in pigtails, and box framed glasses sat high on her nose. As usual, she wore a simple black tee shirt and pair of baggy jeans, which did a decent job of showing off just a hint of her ass as she leaned over to peer into Christine's room, which Patty was quick to take note of.

Inside, Patty Anne's sister was cheerfully bounding about her room, dancing as she cleaned. Nude. From her vantage point, Kelly finally caught a glimpse of the thing she'd been hearing about from Patty Anne for nearly two years: Christina's penis. Christina was a full six or so inches taller than Patty Anne, lean and tan. Her messy, semi curled red hair was tied back in a loose bun above hazel eyes set in a narrow face with an angular jaw. Kelly's eyes were wide as she stared at the organ bouncing and flopping between her thighs. It looked like an elephant's trunk with a large, round, purple knob on the end. The skin of the nearly foot long snake was lighter and silkier, owing to obvious bikini tan lines.

Kelly turned back to Patty Anne, pointing at the door. Patty for her part, was grinning smugly, finally having proven how well endowed her sister was. Patty Anne was a lean, athletic blond with a taught, toned body. Her hair was cropped short, falling just past her ears on either side of her head. She was beaming.

"I told you she was hung like a horse!" She'd whisper.

Kelly shook her head in disbelief, returning to the keyhole to peer in on the still nude girl. Patty Anne rolled her eyes, crossing her arms.

"Ok, ok, you saw it, that's---"

"Oh my god!" Kelly gasped.

"What? What is it?" asked Patty, quirking a brow.

"She's getting a chubby!" giggled Kelly, pointing at her groin.

"What? Lemme see! I've never seen her get hard!"

Patty Anne pushed her way back in front of the keyhole, much to Kelly's dismay. Sure enough, there was her sister, as naked as ever, only this time her flopping limpy had swelled into a half erect, bobbing chub. Christina moved out of sight for a moment before returning with what looked like a long, clear plastic tube. It was maybe a foot and a half long, and as thick as a softball, with a black rubber ring around the open end and a hose that led to a hand pump. With a wide, toothy grin, Christina would plop down on the edge of her bed, unceremoniously thrusting her turgid dong into the contraption's mouth, the rubber ring coming to a seal against her shaved abdomen. With a click and a hiss, Christina began to work that trigger, and it dawned on Patty Anne exactly what she was up to. Patty leaned back to Kelly.

"Chrissy's using a pump on it! Look!"

Kelly bit her lip as she feasted her eyes on the display. Christina's penis began to gorge and swell, extending longer as suction built in the clear tube. Kelly's mouth hung agape as Christina's thickness grew, reaching truly insane proportions inside the tube. She bucked and ground her hips, moaning. Kelly found herself wishing she was the tube.

"That must be how she got so big!" whispered Patty, leaning in, "She's been using that pump all this time!"

Kelly was too preoccupied to notice Patty Anne reach down to the hem of her shorts, whipping out her five inches and modest, round sack. Christina arched her back as she pulled on the tube, the now tight plastic taking a good deal of effort to remove, popping free from the pre-slick organ after a surprising amount of work. Christina's penis was now nearly a foot and a half long, the giant, glistening glans a deep purple, the shaft a throbbing, angry red. Christina grabbed her meat, squeezing tight, her fingers sinking into the strangly spongey flesh as she began to masturbate furiously, her breasts bouncing erotically with each zealous stroke. Her cock flopped wildly, somehow still not erect, the wet slapping sound audible even over the music. Christina gasped and clamped her eyes shut as the dragon between her thighs erupted, flailing wildly as she came, splattering her breasts and stomache with her own semen.

Patty Anne and Kelly quickly vacated the scene, before the cum-spattered Christina found them in the hallway. That night, the two girls discussed the prospect of swelling their own penises to enormous sizes, and, sitting across the bed from one another, masturbated to multiple orgasms before falling alseep beside one another with sore, empty balls.

The next day, while Christina was at work, Patty Anne crept into her room and found the pump. Kelly was practically bouncing out of her skin with anticipation. The idea of being hung like a horse had been all but a fantasy until now. Even so, Patty insisted on going first.

The girls stripped nude. Kelly was always self conscious around Patty Anne, even more so now, in the nude, with her lean body on display. Kelly was practically transparent, she was so pale, and her chubby stomach left her feeling somewhat put off. Coupled with the relatively small penis between her thighs, and Kelly was a walking recipe for adequacy issues.

Patty slipped her penis into the tube with ease, her little length nowhere near as impressive as her sister's gargantuan beast. Patty took hold of that hand pump and began to work it, a dull hissing sound accompanying each pump as suction built inside the contraption. Kelly watched, mouth agape, as Patty Anne's five inches grew thicker, and longer. Six inches. Seven inches! Patty grunted, tilting her head back as she pumped herself to even greater sizes. Her cock was bulging, throbbing, turning colors. Kelly watched intently, her own erection. Patty Anne gasped lewdly, tilting her head back as she suddenly ejaculated inside the tube, her balls tensing. Kelly's face flushed as she watched the display from only inches away.

Patty pumped and pumped, her penis nearly ten inches! It was huge! Kelly's mouth watered as she stared at the huge, purple organ, veins bulging over it like some bestial monster! Suddenly, Patty let out a shriek, her back arching with one last pump. Her penis grew one last time, and suddenly, without warning, exploded! The mighty erection inside the tube shredded itself, bursting at the seams, sticky white cum and deep crimson blood coating the tube's interior! Patty's lithe, tanned body fell limp, her eyes wide with shock for a moment, perky breasts heaving as she pants with rapid, labored breaths before passing out.

Kelly sat frozen in shock, staring at the gore lined tube. Shaking off her stupor, she reached for the release valve with trembling hands, the suction breaking off with a high pitched hissing. Pulling the tube away, Kelly's mouth hung agape at the sight... Patty's penis was little more than shreds of meat, the organ a shriveled, useless mass of ruined flesh. Her balls were a taught, round mass between her thighs, neither orb distinguishable from the other. Kelly stared for what seemed like an eternity until, at last, she felt a drop of pre ooze from her cock.

Staring down at her close friend's model-like body, her jealousy gave way to a perverse sense of satisfaction at the destruction of Patty's penis. Her amusement was only topped by her arousal, and soon Kelly was looming over Patty's Anne's unconscious form, masturbating furiously, the wet sound of her zealous self-abuse echoing through the room. Her breasts jiggled, wide ass clenching as her balls grew tight between her chubby thighs. She erupted, long ropey strands of cum splattering Patty Anne's body, painting her prone form with seed, the last of the potent load landing squarely on that shriveled, ruined meat between her thighs.

It was only then that Kelly, nude, coated in sweat and panting, called an ambulance.