Tim gulped down the potion and laid down the bottle. At first he didn't feel anything. But then a shooting pain engulfed his body. It hurt so bad he couldn't scream; he just fell forward, bracing himself on his dresser, which had a mirror above it.
Tim groaned as his spine popped and stretched, making him grow taller. He saw his skin become more tanned. He looked up into the mirror as he saw his coarse brown hair turn into a smooth, glossy black, which was in a stylish cut.
Now came the worst pain of all. Tim could barely keep his eyes open as his face began to remold itself into a far more handsome shape. His eyes turned a bright blue, his lips became more cupid-like, and soon Tim realized that this was not the face of a 13-year-old. It was the face of a 16-year-old.
Now his muscles cramped all over his body. Tim watched in amazement as a 6-pack of abs became visible, and his pecs pushed out above them, just enough to make themselves known while maintaining a lean physique. His biceps grew and his legs thickened. By now all of Tim's clothes were in tatters. Even his underwear was struggling to contain the growth of his package.
Finally the pain let up. Tim woozily stood to his new height of 5'10"- and immediately the room began to spin. Literally. Tim fell to the floor and lay there as the room spun into a blur.
When it stopped he stood again. But everything was different. His room was bigger, so was the bed. There was a TV in here, and also a set of weights.
Tim realized he was clothed again. He was wearing a pair of tight jeans and a tight polo shirt. Suddenly he was overcome by a stream of memories. His parents had gotten him started in acting young, and when he was 13 he had landed the lead in a Disney Channel Show. They moved to L.A. and bought a nicer, bigger house. Now he was one of the hottest young actors in Hollywood. But he still attended school and lived a normal teen life. Every girl he knew wanted him, but he wasn't that kind of guy. He preferred to keep people guessing.
Tim smiled and walked out the door into his new life.