Some slight changes

"Uh... I wish that my cock was bigger, at least 13 inches when erect" you say quietly

"Sure thing!" the Narrator replies and with a flash of light you have a much bigger cock.

"I also wish my pussy will always appear tight to whoever I have sex with so it's the best sex they have" you say getting more confident

"And done." said the Narrator.

"Oh also, I wish I could change my hair colour at will. Just think that it's blue and it could turn blue" you say

"Hm, haven't heard that one before - done" the Narrator says

You quickly think about your hair being blue and when you look at it in front of your eyes it's definitely changed blue!

"Awesome... can I have someone to test this all on?" you ask

"I dunno, can you?" the Narrator says like a parent

"I wish I could have a test person" you confidently say

"Good, male or female or futa?" the Narrator asks