"Hmm, sure, if you want."
"W-What?! Already? Wow, I guess you can do it pretty quick when you want!" Kyoko said, surprised that she didn't have to wait for long. "I'm just a very fast grower!" You giggled.
As your new best friend was becoming even taller, you realized that it wouldn't be too hard for you to give her that dream body of hers. You were already planning on growing her breasts, as well as adding to her height, and also slimming her body a little bit, making her into an amazing beauty.
She grew to 8 feet tall. She was now nearly ten feet tall, and still growing. "Aaaaahh... this is so cool! I'm so tall now!" She screamed as she stretched her arms high.
"I want to make you even taller, you know. I mean, we are friends, right?" You said with a big grin on your face.
"Oh my gosh, of course!" Kyoko replied, her face beaming. "You're such a great friend, Nayuki! I'm going to grow so much, and become the most powerful woman in this school!"
You giggled. "You think so? I have a plan for that. I'll give you a great body, but only after you have some kind of power." You explained to her. "But I can't just tell you now, because it'll ruin the surprise! You just have to wait until you're really big!"
"Oh wow, that's so exciting! But I really want my height to increase first."
"Hmm... okay. But remember that you are going to look like a giant when you're done!"
You had planned to make Kyoko a fifteen-foot-tall goddess with a pair of giant breasts, but the room was getting too small, so you created a bigger room next to the gym. The next one after that was even bigger than the others, and so on. After two gym rooms, you started to get a bit of a headache, but it was soon forgotten as Kyoko was growing at a tremendous speed.
She reached a height of 19'6'', completely towering above everyone in the school. Her breasts, though, were only the size of her old body, so you made them grow bigger, and bigger, and bigger. They were now the size of beach balls, and growing.
"Kyoko, I think you're finished growing." You said as you looked at the massive giantess towering above you. "Really? Thank you so much, Nayuki!"
You laughed at her response.