Immediately, he felt the changes wash over him. He felt his body compress as his recently acquired body was shrinking down smaller and smaller. He looked at his muscles and while they were not exactly weak, he could tell he was not as strong as he was originally. It felt like his entire body was being scaled down into a much smaller package. However, that wasn't the most intriguing thing he noticed about all this.
No, he was more fascinated by how not only was he shrinking, but the room was growing. It wasn't just limited to the room itself either; the bed, the desk, bookshelf and dresser seemed a bit bigger to him now. He was still able to reach for everything and get to what he needed, but it was very clear it was primarily built for someone who was much taller than him.
He glanced at some of the posters on his wall. He saw a video game poster of two armed soldiers, a man and a woman, standing back to back. Originally, the man was about a half head taller than the woman, but in this new reality, the woman was an impressive two heads taller and her breasts seemed to have gotten larger to match her new size. Any poster that featured men and women together seemed to reflect this new dynamic.
Finally, it seemed like the changes had stopped. He had stopped shrinking and his world had stopped growing. He decided to take the book and look around at the new world he created. He opened the door (that only met him half way it seemed) and went down to the living room to see his sister. She saw Veronica and WOW, she was big. She was easily at least 6 and a half feet tall and probably close to 7 feet and she looked ripped as well. She was clad in some exercise clothes and covered in a bit of sweat, seems like she had just done a work out.
After having gawked at her amazonian sister, she finally notices him and gives a big smile. "Heya, Ken! How's my sweet lil' bro doing today?" She gets up and gives Ken a big hug. Ken noted that he doesn't come up to her breasts any more. Truely, this was huge difference to behold. She looked down and noticed the book. "Hey, whatcha got there?" she questioned. She reached down and easily grabbed it, despite the fact that Ken was holding it pretty firmly.
"Wha? H-hey! That's mine!" Ken struggled.
"Haha, cool your engine, bro. I just wanna have a look, nothing too much else." Veronica replied warmly.
His new sister was friendly enough it seems but he was a bit distressed that he was so easily overpowered.
"Hmm..." Veronica muttered softly as she looked at the book...