Kelsey looks down to her now "little" brother, who was around 3 inches tall and standing naked on his own huge clothes looking up to the giantess girl with a fear expression on his face, as he was now trembling scared of Kelsey, he doesn't know why, but maybe it was because that he was now tiny, it could his instints telling him to be scared of Kelsey, like little animals do when they found bigger predators, he wasn't even covering his private parts as he just stood there in silence.
"Well well well, looks like I'm in charge now little bro."said Kelsey with a smirk on her face looking to Sam.
"Ke-Ke-Kelsey! Wha-what happened? Why I'm tiny?!" exclaim Sam scared with his now cute and squeaking voice tone.
"I don't know, I just wished to be bigger than you so you could listen what I say and then you just shrunk to tiny size, maybe I have powers now." said Kelsey to Sam.
"No that can't be possible, people don't shrink!" exclaim Sam to Kelsey.
"Oh, yeah then let me try something, I wish I grow up a bit." said Kelsey closing her eyes.
Suddenly, Sam saw how his sister body starts to glow for a few seconds with shining light, when it fade, Kelsey then starts to grow not only in size, but she also was maturing, when it stops, in front of Sam was know Kelsey who now looks older, she could be thirdteen years old now, her clothes look smaller and tight on her, Sam can even notice his sister's nipples pressing againts the top of her dress, he doesn't know why, but he was both scared and aroused at the same time, when Kelsey opened her eyes she looks around and noticed the changes as she smiles satisfied.
"Oh yeah this is so awesome!" exclaim Kelsey excited.
"No way." said Sam surprised in disbelief for what just happened.
"Oh yes tiny Sam, I have powers now, things are going to change around here from now on, you will be now my little pet..." said Kelsey with a smirk looking down to Sam and she then bend down to try to grab him, but she suddenly stops. "Ouch! This clothes are so tight now, it hurts a bit, I better take them off." said Kelsey anoyed and tries to take off her dress.
"This is my chance!" thought Sam desperately as he look down to the floor.
Then at this moment, Sam took impulse and jump out the couch, he then starts to run on floor, try to find a escape route of his now giantess preteen sister, while she was taking her clothes off, he doesn't know why this was happening but he doesn't want to be his sister's pet as he runs with all his might while looking around to find place to hide, when suddenly he heard a ripping sound from Kelsey's direction.
"Yeah, that's better, stupid dress if you annoy me then I better rip you out of me..." said Kelsey satisfied after she destroy her dress and looks down to the couch." Eh? Sam where are you?! You better come here now or I will-Ouch! Stupid panties!" said Kelsey with a tear coming out of her eyes, her panties were so tight now that when she took a step, she feel like if someone just give her a wedgie.
Sam after hearing this he took this opportunity to find a place to hide behind a flower vase in a corner of the living, Sam then took a peak from his hiding place and saw his giantess sister ripping off her panties, she was now completely naked and this make his little friend to rise as he saw his sister's huge buttcheeks, but when Kelsey turns around he quickly hide again of the sight of his giant sister.
"Sam, you better come out wherever you are now, I know that you are still here in the living room, I will count to 20 and if you don't come to me right now like the good little pet that you are, I will get very angry with you." said Kelsey upset as she walks around trying to find her mouse size brother.
Sam's heart was beating with such speed with fear as he tries desperately to find a way to get out of this mess and when he feels the giant steps of Kelsey coming closer to his direction, he suddenly finds a hole in the wall, it was bigger enough so he could pass in, he doesn't know what he could find in there, but it was better than the alternative, so he quickly runs and go inside the hole, just in time when Kelsey just moves the flower vase as she was looking for her tiny naked brother, she then finished counting and after a minute, she frustrated and took a seat on the couch as she grabs the remote.
"You will come out to me Sam, I know that you will, you need me now!..." exclaim Kelsey upset to the living room so Sam could hear her, then she points the remote to the tv. "Well at least I can watch my cartoons now." said Kelsey as she just seat there on the couch naked, watching the tv.
Meanwhile Sam was now hidding and sitting on the floor inside that hole of the wall waiting, he assumed that this could be just temporal and he will return to normal after sometime, he believe in that thought as he tries to rest, suddenly, he hear some noise in the hole, something was coming to his direction, when he was ready to run away, suddenly, behind him he feel something furry touching his bareback, when he turns around, he got frozen scared of what was now in front, it was a rat with white fur and red eyes, of around 6 inches tall, the double of his actual size and it was standing on it back legs looking down to Sam with a curious look to him.
Sam and the rat look each other for a few seconds, but then, scared, Sam just scream and turns around to escape from this "giant" beast, but when he was getting closer to entrace of the hole, he was suddenly push down to the floor as the rat was now pin him with it's weight, then the rat was now smelling him as Sam feel the breath of the rodent on his neck back.
"Please don't eat me!" cries Sam like a little girl with tears coming out his eyes, fearing for his life.