Lisa stands staring at the barrel of the gun, still worried as Bart pulls the trigger. Bart watches as a large, green beam rapidly fires from the device which shocks him since he expected it to be a bullet of some kind. Instead, the beam fires straight at Lisa as her eyes widen and the beam is absorbed by her body. Bart doesn’t realize that he is so shocked by the blast that he is still holding the trigger. He comes to his senses after about 20 seconds and looks at Lisa to see that she is paralyzed by the strong blast. He lets go as the beam stops. He looks to see that Lisa suddenly looks exhausted.
“Are you okay!?” Bart yells running to his sister.
“I think so,” Lisa reassures him, “I just feel lightheaded. I need to sit down.”
Bart helps his sister sit in a chair next to the kitchen table and she rests her back on the backrest.
“Are you sure you’re, okay?” Bart asks again. “I didn’t expect it to be a laser beam of some kind.”
“Me neither” Lisa says. “Just watch me over for a few minutes, okay? We’ll see what happened soon, I think.”
“Okay.” Bart agrees.
After a few minutes, Lisa’s body begins to shudder. Bart notices as he grows more concerned for her and runs by her side.
“Lisa? Are you okay, you’re shivering.” Bart asks.
“I’m not shivering.” Lisa says. “I’m shuddering because the energy from that beam is doing something, but I can’t describe it.”
Bart is shocked to hear this; however, he is more shocked when he sees Lisa spurt bigger. For a second, he can’t tell if she is actually growing. After a few more seconds though, his suspicions are confirmed when he sees his sister grow 6 inches in a matter of seconds with two growth spurts back-to-back. Lisa looks at herself after the seconds spurt and sees her vision rising away from the table in front of her. Bart backs away as Lisa grows again giving her another 3 inches. Her pajama onesie stretches quickly as it tries to keep the spurting 8-year-old covered. Lisa can feel her pajamas stretching as her legs and arms grow longer. She looks in shock to see the sleeves rising up exposing more of her arms and legs.
Bart continues to back away as Lisa’s growth spurts continue at a steady rate. Lisa moans in pleasure with each spurt as she gains 2 feet in just 1 minute. Her ass grows bigger on the wooden chair as it spills over the edges soon. Her pajamas struggle quickly as her once comfortable onesie begins to look more like a one-piece swimsuit. Lisa’s head is now only a foot from the ceiling with her growth accelerating.
Lisa feels something weird on her rear end and realizes that the butt flap of her onesie is bulging against her growing ass. With each spurt it strains more as the buttons groan against her rear. Her panties bulge out more and more of the flap until the buttons fly off and the door opens from the pressure exposing her panties for Bart to see. Her head hits the ceiling as her stomach pushes against the table knocking it over along with Bart’s chair. Lisa’s own chair buckles under the girl as she is now 10 feet tall. Her weight causes the chair to groan and deflect until it collapses with a THUD under her weight. Lisa hits the floor with such force, it causes the tiles to crack under her ass. The onesie is stretched too much, and it begins to burst at the seams revealing Lisa’s bulging skin through every hole. The pajamas finally shred away leaving Lisa in her underwear as she is now 15 feet tall. She crouches avoiding the ceiling as her feet hit the other wall. Her growth finally slows as she is now nearly as big as the kitchen and in her panties and tank top. She looks at Bart in amazement as he is in the corner of the room looking at his now giant sister.
“That felt incredible!” Lisa says, breaking the silence. “I want to go again!”
“What!?” Bart yells. “You’re as big as this room!”
“So what?” Lisa says. “I can outgrow this house if I want to, that device is amazing!”
“But where will we live?” Bart asks concerned.
“Anywhere!” Lisa says. “No one can tell us what to do if we’re giants! Come on bro, join me!”
Bart looks at her and the device. He thinks it would be cool but is concerned they can’t shrink back down. He decides to…
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