...feet.
Rob pulled off his socks, leaving his feet bare.
He decided to make his feet bigger, to test it out.
"feet." he said, setting the belly button to change the size of his feet. he set the size to 'grow', and then, he pressed his belly button.
immediately, he heard the sound of stretching rubber. At the same time, his feet stretched out larger on the carpet below. He could feel the carpet sliding underneath them as the soles of his feet took up more surface area. They now appeared to be a few shoe sizes larger. He lifted his right foot up and wriggled his larger toes. Everything felt normal, except that his foot seemed slightly heavier.
he pressed his belly button again. almost immediately, he felt his feet spread out larger on the carpet. Looking down, he had to laugh. His feet were huge now, probably bigger than the feet of Bigfoot. This time the weight difference was very noticeable. It seemed like someone had tied a lead weight to his ankle. He wriggled his big toes again. They were thicker than his fingers now. How weird, he thought.
He had to try taking a few steps. It was a strange sensation, walking with such big feet. He felt like he was walking around with scuba flippers on his feet.
he pressed his belly button again, and, once again, his feet grew. now they were more bigger than before. He tried lifting his foot again, but it was no use. Even using all of his might, he could just barely get his heel off the ground. He figured that he might be able to shuffle around if he pulled himself along with his toes and slid his feet along the carpet.
feeling reckless, he pressed his belly button one last time, and held it down. Rapidly, his feet grew and grew till they were now as wide as the door. He wriggled his giant toes again and laughed to see that he now controlled such huge digits. His smallest toes were the size of soccer balls now!
After an experimental pull, it was clear that he wouldn’t be moving around at all with feet this big. He was anchored to the spot by them.
After admiring their size for a minute, Rob set his belly button to shrink, making sure it still focused on only his feet, and pressed it and held it down. When his feet shrank back to normal, he released his press on his belly button.
Rob wriggled his toes, wondering what to do next....