As Karen walks back and forth seeing her daughter the size of her phone she finally gets a idea "Erin I have an idea but it will take a hour until it's done are you going to be ok like this?" Karen asks Erin "yeah I can I mean this is kinda cool but I am naked" she says still covering herself. Karen thinks of a way to get her clothed "Go to your room, wear your old doll clothes" she says to Erin and starts working on the experimental serum
~Erin's perspective~
"I don't want to tell mom that this was one of my big fetishes and fantasies I should enjoy every minute like this" she says and heads out to her room... She finally gets to her room seeing her room being so huge it's like a bigger version of earth "I love this I love being small I have to trick mom into making more of that" she says giggling to herself as she searches for clothing
~after picking a outfit~
Wearing her barbie dolls swim suit she decides that she should go back down stairs to check on her mother but with style. She gets into her remote control Barbie doll car and drives too the lab "I love being small but I can't let mom know that" she says looking at stairs leading down to the basement lab "Mom is it done yet?" She asks her mother "yes sweetie it's done come on let's get you big" she says picking Errin up and caring her to the table in front of a sun set yellow looking drink "I just drink it?" She says. Her mother nods "yes just drink it and you should be back to normal" her mother says hoping it works.
~Erin sips the drink~
"Taste like pineapple" she says then hiccups starting to get a little bigger ripping the Barbie bathing suit as her body grows from being the size of a phone to being the size of a toddler then slowly grows to her original height of 5'9 "it worked mom" she says hugging her mother naked. "I can't believed it worked!" Her mother says smiling and then pulls away "I should destroy all these experments before they do something worse." Just as Erin feared her mother was going to through away so many things she didn't test "wait mom can you leave them who knows they might come in handy you can probably sell them and make a lot of money" she says to her mother. She thinks "fine but make sure we tell no one about this not even your father ok?" She says asking her daughter she nods "yes mom" Karen was about to leave the room when suddenly Erin was starting to grow to what looked to be 6'5 and then rapidly growing being 7 ft to 8ft "Erin your growing, oh my god, I thought I got it right!" She says getting scared for her daughter as she begins growing to 20ft then 40ft breaking the roof above "Mom what's going on!" She says her breast growing to a enormous size "mom I feel like I am changing"she says with a moan as she grows more "this feels so good" she says grabbing her breast, her ass growing to a bigger rounder size her body finally stops at 50ft tall "Honey can you hear me" her mother yells from the ground . Erin hears her mother and lifts her up "mom I don't think I am fixed yet" she says still moaning a bit "I will fix this just don't go anywhere people will notice but I will fix this I promise" she says in her daughters hand
~to be continued~