Your now 4"4 once very short for her age little 9 year old sister Kelsy stared at you quizzically.
Aside from the movie still playing there was an awkward silence as you both exchange stares.
"What's wrong big brother" she asked innocently.
You broke out of your stupor.
"I-it's nothing... Just um.. Do you feel strange or any different at all?"
She put her finger to her face and thought for a moment. "Umm no I don't think so. I mean I feel tingly and somehow more awake than I was a few minutes ago but nothing that strange"
You were shocked. Somehow Kelsy didn't notice or feel a thing despite having added 9 inches in height.
She continued to look at you.
"Oh never mind then, I'll be back in a few minutes" you say nervously.
Kelsy shrugged and went back to watching the movie.
You turned around and headed back into the other room. With your back turned and Kelsy preoccupied neither one of you noticed a second albeit smaller and thus shorter growth spurt start to inch Kelsy even bigger.
You walked into the other room and further examined the ray gun oblivious to your little sisters second spurt.
Looking at the device you whisper to yourself:
"This little thing actually did that to my little sister?! I wonder if I turn it the other do I dare try to change Kelsy back to normal? On the other what if you shrank her too small and couldn't return her to normal."
Thoughts in your mind scared you.
Then there was more
"On the other hand if just that small adjustment did the much I wonder how much effect this device could have if I went closer to the larger dot. I know Kelsy is my sister and all but this could be my 1 best and safest shot at *gulp* my Giantess fantasies and fetish come true.
I-I'd never do something inappropriate but the chance right now right here to see this in real life could be a once in a lifetime opportunity"
As you nervously adjust the device much closer to the much larger • symbol but yet not all the way to it and debate with yourself Kelsy's second growth spurt comes to an end.
The second spurt took her from 4"4 to 4"9. She now just slightly filled her clothes more than the last spurt. Dress, skirt, socks, panties and all.
Finally you came to a decision.
Even though you had little understanding how this device worked, or no clue if Kelsy's 1st dose of the ray had even finished running its full effects you throw caution to the wind.
You took aim at Kelsy once more and pulled the trigger. This time to your slight surprise a larger lightning bolt emits from the ray gun yet it still hits its target aka your little sister whom you for now still have 2 feet height advantage over.
The bolt struck her in the side unnoticed by her and once more she appeared to of felt nothing. This time you pocket the gun and walk casually back to the couch.
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