Sister Thief

Jennifer smiled in the dark as she heard her sister’s summer sleepover wind down. It was around midnight, plenty early enough for the 18-year-old to stay up, but much harder for a pack of 15-year-old brats who’d been running around the neighborhood all day to keep their eyes open.

She clenched her legs together in anticipation. She hadn’t had a chance to drain this many people at once since her own ascension to the top of her school’s pecking order at a sleepover just like this one three years ago, where she’d gone from just-another-cute-girl to the absolute hottest thing on two legs in one evening. Smiling at the memory, she silently snuck into the living room and took in the scene.

It was so warm that summer that her parents had just pulled out a couple of inflatable mattresses and pillows and told the girls to figure it out; they’d ended up just pushing it all into a pile and sleeping on top of it, the sheets used as little more than extra padding for their heads.

The full moon outside lit up the scene, and Jennifer took stock of her prey. Her sister Jasmine’s body was impressive for her age, her chest outclassed by volume only by the somewhat chunky Mary, whose belly another girl was using as a pillow. Other girls had other things Jennifer could see challenging her for supremacy down the road: a bubble-butt here, on Lindsey; a pair of long, fit legs there, on gymnast Stephanie. Licking her lips, Jennifer started stealing.

The glow immediately suffused the pile of sleeping high schoolers. Almost immediately, Jennifer’s D-cup bust began to swell as she siphoned inches off the girls’ measurements. She’d always been a tit-focused girl, and one of the things that had drove her nuts about her sleepover years ago was the relative dearth of really bosomy girls for her to steal from. Now she was making up for it, draining everything she could get and watching her own breasts benefit as a result.

Other parts of her were also growing: her legs and torso were lengthening, and she could see Stephanie compressing like a stretched-out spring, going from nearly six-foot-tall to barely cresting the five foot mark in moments. Accordingly, her own body telescoped up, going from five-six to six-two, much of it concentrated in her killer legs, which seemed to go on forever. Her hips and ass were also swelling, and even her muscles got in on the act, swelling subtly under her skin, just enough to make her look proportional.

And still her breasts were growing. She consulted her rapidly-shifting memories and learned that she was now wearing an H-cup. Changing focus, she decided to try out one other thing she’d thought of while planning this little heist and focused on not only the girls’ current bodies but their future development, seeing if her little talent could work on such a theoretical quantity.

Apparently, it could, as years’ worth of potential maturation suddenly slammed into Jennifer’s already highly developed form. She could feel herself stretching just a few inches taller, her hips inching just a few inches wider, and her breasts flooding with even more growth.

Finally, she twisted shut the magical spigot, leaving a few droplets of potential for her little sister and her friends, and stumbled from the room, heaving deep breaths as she made her way to the bathroom. Groping for the lightswitch, she gazed into the mirror at her new self.

She had ended up every bit as incredible as she’s hoped. As new memories of her body’s extreme puberty crashed over her, she took stock. Six-foot-six and strong as an ox, Jennifer had always been the biggest, tallest, smartest girl around, and as soon as she hit puberty she knew she was going to be the hottest, too. Hips as wide as a doorframe, tits the size of watermelons, a softly-muscled waist, and blonde hair that reached her bubbly ass, she was the complete package, just scaled up to NBA-player size. Her classmates practically worshipped her; her own (very) little sister treated her like a minor deity. Colleges had tripped over themselves to get her to attend, and she was still taking her time deciding between Harvard and Yale, but she was sure no matter which she picked, she’d be the top woman on campus.

“And if not, well, I know how to fix that,” she said, winking at the mirror.