"Why don't we go to our room? It's getting kind of late." Katie said.

Matt nodded, and the two left for their hotel room. When they got there, Katie headed into the bathroom.

"I'm going to change into my nightclothes!" she said.

While Katie started to change, she looked at her phone. There was an app that she hadn't noticed before. She looked at it, and opened it up. It was called "Reality Rewrite", and the description was as follows:

"Is there something you don't like about your life? Well, now you can change it with this program! Simply enter in a wish and it will come true! However, you cannot change people's personalities and character."

Katie decided it was worth a try, and entered in the following commands:

I will be able to convince Matt that it is okay for me to be in just my bra and panties.
I will be able to change my or Matt's size at will, or the size of any part of our bodies.

Katie pressed enter, and then waited. She didn't feel any difference, but then she tried to make her boobs bigger. Just like that, her breasts expanded some and tightened her shirt. Katie giggled, and then returned her breasts to normal. She then took her shirt off and her pants off, leaving her in cute, lacy blue panties and bra. She then opened the door.

"I can't seem to find my night clothes, so I'm just going to bed in this." Katie said, walking out.

Matt saw her and was shocked.

"I... uh... don't think that's... um... quite a good idea..." Matt said.

"What, that I'm half naked? Pfft. We're not going to have sex, so it's okay. And besides, don't I look sexier in just this?" Katie responded.

"Yeah, but... well... ugh, I guess so..." Matt said.

Katie decided she wanted to have a little fun, so she made her breasts grow a little. Her bra strained a little, but was fine.

"Uh, Katie, did your... um... boobs... just grow some?" Matt asked.

"No, they've always been this big!" Katie responded.

Then Katie decided to make herself grow taller. She slowly inched upwards, and her panties tore a little. When she stopped, she was six feet tall.

"How did you just grow taller than me?" Matt asked shocked.

"Did you hit your head?" Katie said, feigning surprise. "I've been taller than you for a while!"

Matt just looked confused.

"Well, whatever the case, why don't you go and change into your night clothes?" Katie said.

Matt just sighed and headed off. Katie grabbed her phone and entered a few more commands into the app:

Matt will be unable to find any night clothes to wear except his boxers until morning.

Matt then called out.

"I can't seem to find my night clothes. I could've sworn they were right here..." he said.

"Well, its okay if you sleep in just your boxers." Katie said.

"What? No!" Matt said.

"Why, are you embarrassed about your... size?" Katie teased.

"No, of course not!" Matt said.

"Then come on out."

Matt grumbled and opened the door. To Katie's surprise, his bulge was bigger than she expected. For fun, she made it bigger.

"Well... you look like you're hung like a horse!" Katie said.

Matt looked down at his manhood, and was surprised to see a large bulge.

"Huh? It wasn't this big before! And besides, we're not having sex!" Matt said.

Katie smiled, and then made Matt grow slightly taller, enough for him to notice.

"Did I just get... taller?" Matt asked.

"No! You've been taller than me our whole lives!" Katie said while trying to keep a straight face. Matt just shrugged and went to bed.

Choices:

1. Katie makes Matt grow into a bodybuilder > (not made yet)
2. Katie has some more fun with Matt > Chapter 5
3. Katie makes Riley grow the next day > (not made yet)
4. Katie returns them to normal, then accelerates Matt's natural growth rate > Chapter 4
5. Katie makes it so they grow whenever someone comments on their size > Chapter 11