"Upstairs to make out," Robert replied, while walking towards the bottom of the stairs, his shrunken sister over his shoulders, the ray gun in his left hand. Jess followed a few steps behind.

When they got to Robert's room, they both decided it would be best if Amanda was tied up with something, in case she ever got the idea to escape.

"I think there's an old barbell under my bed," Robert offered, as his girlfriend squatted down and picked up the dusty item. She experimentally bent it a few times, amazed at how strong she was, before returning it to its original shape.

Robert held Amanda in place, as Jess walked over and placed the bar on either side of the smaller girl. She then twisted it until the two ends of the bar met, then she proceeded to tie it into a bow.

"All wrapped up for Christmas," Jess commented on her handiwork. She then pushed Amanda down, causing her to fall backwards and hit her head on Robert's bedroom closet door. She was relatively unharmed, although she could feel a small bruise forming on the back of her head.

"Why'd you do that?" Amanda asked, making sure her voice didn't give off even the slightest hint of anger or irritability.

Jess squatted down in front of the shrunken teen, and smiled as the smaller girl recoiled a little in response. "Because I want you to watch."

She stood back up and began kissing Robert, as she moved her hands all over the muscular body of her boyfriend. Robert responded by doing the same, while his member began to grow.

Amanda watched as it continued to swell, becoming larger than anything she had ever seen before. She would turn her head from time to time, not having the desire to see her younger brother's junk grow before her eyes. It continued to creep upwards along Robert's midsection, eventually topping out at just over a foot in length and over four inches wide.

"You think it's time we took this over to the bed?" Robert asked Jess, with the ray gun still in his hand.

"Sure," she responded. She had been waiting for this moment ever since she first saw Robert grow into the muscular behemoth he was now.

The two made their way over to the bed, and Robert placed the gun on his nightstand. They continued kissing and groping each other, while Jess continually eyed the gun.

She had been wondering how the gun actually worked. I mean, sure, she had seen the gun in action and she knew there were a series of dials on either side of the gun. But that was it. Still, she debated if she should grab the gun now or later.