Blueberry flavored Water

Amy walked into the seven eleven sweat from her chocolate brown hair dripping on the tiled floor. She had been biking all day, getting ready for the annual triathlon coming up soon. The shop clerk couldn't help but stare. She was beautiful, with her sky blue eyes, decent sized breasts, and her long hair brown hair that fell down her back. She was only wearing gray sweatpants and a matching shirt, but that didn't deteriorate the clerks staring. Amy walked casually to the drink isle not wanting to put on gain all the calories she had burned with one slurpee. She walked up and down the ailse looking for something exotic when something got her eye. Blueberry flavored water the tag said. Amy picked it up. I wonder if this tastes any good? she wondered. She flipped it around to the back to see if it had any sugars or anything, but she couldn't find anything not even a list of ingredients. She mentally shrugged to herself. They wouldn't put it in a store if it wasn't safe, right? She bought it then hopped on her bike and started to ride home.
As usual, the house was empty when she got home. Since she was an only child and her parents worked late she was usually alone. She was used to it, but the house was really quiet which she couldn't stand. She placed the water on the table her family had in the tv room and went into the kitchen to turn on the CD player that her mom used when she was washing dishes or cooking. Amy flipped through the CD case that they had and settled with the new One Direction disc that she had bought recently. She turned it up all the way and went back into the TV room, grabbed her water, and collapsed on the couch. Amy opened the cap on the bottle and took a tentative sip. Her eyes widened and she gasped. The water was amazing! It tasted and felt like she was swallowing real blueberries! She chugged half the bottle and was about to finish it when she realized she should show it to her parents. Reluctantly, she put the cap back on the bottle and made to her room to change. When she stood up however, she thought she heard a faint sloshing sound coming from her butt and she felt really heavy. She shrugged it probably wasn't anything.
Suddenly, a gurgling sound could be heard from her butt. Despite herself, Amy blushed. She put her hands on her butt and started to rub it when she screamed. Her butt was ballooning outward and an incredible speed. Each butt cheek was already bigger than  a basketball and still growing. She felt her panties stretching with her expanding bottom, but they were starting to feel tight and Amy could tell they wouldn't last much longer. "What's happening?!" Amy unsuccessfully tried to push her butt back to its normal size when her thighs started to grow. "Oh God!" Amy's sweatpants held, but she heard a loud snap  that signaled the end of her panties. Her butt had stopped growing, but each butt cheek was about the size of a huge beach ball and her thighs started to grow at a faster pace. Amy's growing thighs pushed her legs apart and that's when her groin started to push down. Amy started to cry as her now massive legs were absorbed into her growing groin. Soon Amy's groin touched the floor pushing her feet off the ground. Amy's body now resembled a tear drop when the swelling stopped. "Thank goodness.", said Amy.
Amy suddenly felt a thirst that she knew could only be cured by more of that delicious blueberry water. She threw herself at the table, which was hard to do since she didn't have any legs. She managed to grab the water, open the cap, and chug it down. She sighed with pleasure as the water went down her throat.  Her hands strayed down to her swollen bottom section. She found what she thought was her butt and she shook it up and down and she heard a deep sloshing sound. "What did I fill up with?!", Amy cried.
Amy blushed when she felt something strange in her stomach. "Why am I so full?" She rubbed her stomach, worried, when her stomach started to push her hands apart. "What? No! Please!" She tried to push her stomach back into place, but her arms were forced into a T shape by her expanding belly. She already looked like she was 9 months pregnant with triplets. "HELP! SOMEBODY! I'M GROWING!", Amy screamed in desperation. Amy felt her arms started to fill stretching the sleeves of her shirt. Her arms were soon sucked into her growing belly and her back started to inflate. Finally, Amy's neck was sucked into her sphere of a body and the growing stop. Amy's mouth was forced shut by her body and she could only see a foot ahead of her. Amy suddenly noticed that her nose was a dark blue. Blue...Liquid....completely round and ball shaped. Amy finally realized that she had become a blueberry. She flapped her hands in frustration against her inflated body. She tried to move, but she must have weighed a ton because all she could manage was rocking her body back and forth. She could here all the juice sloshing around inside her. Her cloths had, lucky, stretched with her body. She could feel a cold draft in her naval area. Amy figured her massive stomach must have been protruding from her shirt. Amy started to cry. How would she get back to normal?