For some reason Jessie decided to go back in the pool ones again to swim from one end to the other. During her short swim she noticed her bikini digging into her body. Because of it she jumps out of the pool earlier. She didn't notice that she was standing in the 6 foot area, where the water was beneath her chin. She tried to move her breasts in order to prevent them from falling out of her bikini top. When she entered the house she nearly hit her head on the door frame, but still doesn't notice a thing because she was to busy with her cleavage.
Her older sister Manda, 6' tall, D-cup breasts, nice ass and black hair longer than Jessie's, noticed an odd thing when her sister passed by her. Her younger 5'4" tall sister passed by her and Manda was just reaching her shoulders. Confused and shocked she asked: "Jessie... Is that you?"
Jessie yelped as she turned to her sister, who is looking up to her. "M-Manda? Why are you so tiny?" Jessie asked as confused and shocked as her sister.
"No why are you so big?!" Amanda responded.
"I-I don't know! What's happening?!"
"Jessie. What have you done?"
While Jessie explained her slightly terrified sister what's happening, her bikini gave away while her head was getting really close to the ceiling. Yelping she sat down covering her body. Before Manda could say anything, Jessie rushed out of the door crouching into her backyard. Because she didn't watch where she was going she tripped over something and landed directly in the pool. She turned around to sit in the pool. But as she did she noticed her feet weren't fitting in the pool anymore and placed them outside the pool.
Manda could now watch her sister grow while sitting inside the pool. After Jessie passed the 20' Manda shouted :"Jessie get out of the pool!" Jessie followed her order and sat down next to the pool. Her growth continued until it came to a halt at 24'. Jessie, still covering her private parts, looked down at Manda.
"What is going on here?" she asked desperately.
Manda didn't respond to her question as she was inspecting her body. Grinning Manda understood the situation and jumped into the pool when Jessie looked away. An even better idea strucked Manda while outgrowing the pool. Quickly she puts her head underwater again and took a big sip of the pool water. Instantly she started to grow faster than her sister before her. After seconds she had outgrown her clothes and found herself at the size of her sister and was still growing.
Jessie noticed the splash into the water of Manda and turned around in shock, only to see her sister growing up to her size. "Manda!? What have you done?" she asked while her sister stepped out of the pool.
Madam kneeled down to notice her sister only reached her boobs already. "The pool makes you grow. The longer you touch the water the faster you grow." She responded after she stopped growing at 40'. Jessie was now at the same height as Manda's bellybutton. To tease her sister Manda patted Jessie's head while Jessie was thinking of what to do next.
While Manda admired her new height, Jessie remembered what she did to make the pool water grow her. She looked over to the spray cans and picked them up carefully. She couldn't remember which can she used on the pool, because the color disappeared when she sprayed it. The only choice she had was to try it out directly. In hope to see results when the spray made direct contact with a body, she tried out the purple can on Manda.
Quickly Manda started to shrink very fast. A short push of the can's button made Manda shrink down to Jessie's size. "What happened?" Manda asked confused. But she didn't notice Jessie spraying her again.
In another spurt Manda shrank down tinier than she was before. 3' was all that reassert from her ones gigantic 40' body. Jessie looked down at her shrunken sister and said smiling: "It's not the water itself. It was my spray that mixed up with the water. But I have an antidote as you can see."
"P-Please Jessie change me back! I feel really uncomfortable at this size." Manda begged.
With another really short push Jessie shrinks Manda to just an inch and picked her up carefully. "You know sis. I have a special place for you now. Maybe you will enjoy it." Jessie placed her between her boobs and now teased her b.s. squishing her boobs together gently. She ignored everything her sister yelled and begged at her, because she had to much fun squishing her.
After she had fun with her "little" sister she looked at the spray cans again. Green = Growth and Purple = Shrink. Jessie got it now. But what should she do with it now? Should she do it like her sister and grow by touching or drinking the water or should she used the purple can on herself and her sister in the process?
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