"You're going to school dressed as a girl again, aren't you?" your sister, Alex, asked.
"School isn't for a while," you say and are surprised at how light your voice has become. Alex shrugs and moves on.
"You look cute," she says. You blush. This all gives you an idea. You rush back to your computer and start making changes.
You want to be dominated by your much manlier sister. This'll make you feel even more girly. You change her so that she's taller and more ripped. Her brests are reduse and held down by bandages she wraps around her chest to make it flat.
Next, you shorten her hair to a boyish short cut and make her face more androgynous. Her midriff showing black top turns into a tank top that sits tight enough on her to reveal her powerful abs. You leave her military stile camo pants be.
Alex won't realize she's been charged. Nore will anyone else. Only themselves and their parents will know that you were once both reversed genders. You both aren't trans, but crossdressers. That is to say, every though you dress as opposite genders and trick everyone, you still identify as a boy and Alex still identifies as a girl. You also change both your wardrobes, accessories and rooms to better fit your personalities. Even adding that some of the things should be kinky.
Since you no longer age and will be a sissy little girly boi for the rest of your days, you go ahead and make Alex immortal and unaging as well. You also boost her stamina, labido and aggressiveness.
Lastly you make it so that Alex likes to use and dominate you and control you. And your parents and any authorities will be fine with it if you were ever caught together. Typing in these commands makes you nervous, but you can always change stuff back if it goes too far. You hit enter.
Instantly your room changes to a far girlier one. You hear something at your door and see your sister, now brother there, leaning against the doorframe.
"Hey," Alex says. You're jaw drops. She looks extremely convincing as a slender, yet ripped and drop dead hot 18 year old jock.
"Hi," you reply, dumbfounded by how hot she's become. She walks in without asking to enter. You both know she's the boss here.