Jess looked lustily at Robert's huge, muscular body and whispered in his ear "Let's go upstairs and have some fun."
Robert smiled broadly. He looked down at his older sister and smiled. "First we're going to have some fun down here," he declared proudly.
He put Jess down carefully and turned the gun to a new setting, using the controls for zero muscle growth and a fifty percent height decrease.
Robert pointed the gun at Amanda and ordered her to stand up. Terrified, she just sat there and shook her head. "Please, Robert don't do this!" she begged.
"Stand up, or I'll shrink you down to one inch tall!", he yelled. Accepting her fate, Amanda slowly stood up.
Both Robert and Jess smiled, eager to watch what was about to take place. For Jess the thought of Amanda shrinking down to a weak and helpless size filled her with pleasure, as she had never liked her. She reveled in the thought of Robert's 'big' sister becoming a tiny pipsqueak.
"Go ahead sweetheart, shrink her down to size," Jess told her huge boyfriend. She licked her lips in anticipation.
"This is for trying to shrink me!" her brother said. Robert pointed the gun at her and pulled the trigger.
Amanda could feel the energy enveloping her. Slowly she began to lose size, as her clothing became looser and looser around her. Jess was about her size before but she gradually began to grow bigger from her perspective, while the already enormous Robert became utterly gigantic.
Both Jess and Robert watched excitedly has Amanda began to grow smaller. She reached 4 feet tall in less than a minute and slowly shrunk down to about three feet tall.
Shrinking even more, Amanda screamed out in a high pitched voice ,"Please stop! Please don't shrink me anymore!"
She found no sympathy from Jess or Robert. "You're going to keep on shrinking until we say so, little girl. You need to learn who's boss, who has the size and muscle around here," Jess said firmly, "Isn't that right, honey?" Robert nodded, his smile growing.
Tears streaming down her face, Amanda's shrinking slowed as she neared 2 feet 10 inches, eventually stopping a few inches shorter. She was completely puny, dressed in clothes that dwarfed her. She looked up at her huge brother who was now nearly three times her size! Jess smirked down at her, even unchanged in size she loomed huge above her.
Robert took a step toward his now much reduced older sister. Petrified, he was afraid of him when he was 8 feet tall, now to her he seemed to be 15 feet tall! She barely came up to his knee in size. She continued crying as she began to realize this was her life now, unless she could get her hands on the gun again, which she thought unlikely. She strained her neck upwards to look at Robert's face, barely visible behind his huge pecs.
Jess took a few steps forward and joined Robert in examining tiny Amanda. Though most people thought she was a silly ditz, Jess was actually quite good at math. She began doing some mental calculations in her head:
"You know, sweetie. If she's just 32 inches tall, and you are 7 feet 11 inches, which looks about right to me, you are almost exactly three times her height. I wonder what she weighs?"
Robert was also curious. "Let's find out," he said. He told Jess to grab the bathroom scale in the closet.
She quickly returned and set the scale on the ground in front of Amanda. Seeing little alternative Amanda stepped on the scale, which quickly read a mere 27 pounds!
Robert and Amanda quickly started to laugh. "TWENTY SEVEN POUNDS!" her brother said. He knelt down and flexed his enormous right bicep in front of Amanda. "I'll bet just my bicep weighs more than that", he said proudly.
He quickly but gently pulled Amanda off the scale and stepped on it himself. The scale seemed to groan under his weight but eventually settled on 408 pounds of solid muscle.
Jess was even more filled with lust for her boyfriend as she saw the number. She caressed his huge bicep and reminded him that they had some unfinished business. He agreed, and they both quickly locked Amanda in a closet. Robert reached down and grabbed Jess by her firm butt and hoisted her up on his huge chest. Wrapping her legs around his waist and her arms around his huge neck, she kissed him proudly. But then she wondered, where did Robert put the gun?