Derrick lived a couple blocks down and over from David's family. From David's window, he could just see the slightest bit of Derrick's family's house. He could, however, clearly see Derrick at the the Smith house cutting the grass. Derrick was 17 years old, he was easily over six feet tall, with blond hair and blue eyes. Derrick had the kind of body that guys are desperate enough to take steroids to get, but thanks to genetics Derrick got it almost of free. He was attractive and he knew it, which made him cocky. On top of having the body of a greek god, Derrick had a massive penis, that he displayed prominently by wearing gym shorts that are just a size to small and tight enough to clearly show what he's packing.
David watched out the window as a shirtless Derrick pushed the lawnmower back and forth across the Smith's lawn, his muscles moving with his body, his shorts straining slightly. The wives in the neighborhood liked to hire Derrick to cut their grass, or clean their pools or weed their gardens, or really anything to get him over to their house. It was a pretty thin veiled secret that Derrick had slept with a good number of the women in the neighborhood. Even if it wasn't obvious that he spent way to much time in the house "cutting the grass", Derrick wasn't one to let an opportunity to brag go by un-used.
This is how David knew that Derrick had slept with both his Mother and his Father. "Hey dork, tell your mom and your dad I said hey" Derrick would tease David, "when is it going to be your turn to ride my fuck stick?" Derrick and his friends would laugh like maniacs as David sulked away. Derrick had stopped pushing the lawn mower and was lazily stretching his arms out above his head while flexing his hips a little, pushing his bulge out towards the house. David saw Mrs. Smith watching at her glass door. He was showing off to her.
David looked at Derricks abs leading down to the bulging shorts and thought, "what I wouldn't give to switch with him." The ring flashed for a moment and the change began. David felt his pants getting tighter as his abs expanded and became muscular. His underwear stretched until they broke as his waste and penis grew from 2 inches to more than 9" soft. David's balls went from marbles to oranges and hung heavy between his legs. When the change was done David could barely take his eyes off of his improved body. He looked up and out at Derrick, who was pulling his gym shorts and boxers up. The unexpected change had made the shorts too lose, they'd fallen to the ground. David smiled, no so proud now he thought to himself.