Change it into a pussy.

You don't exactly want to have a cock, that's sort of the point of being a girl. You'd much rather have a cute cunt and experience what girls experience. So, you close your eyes again, and focus on your crotch. You start to feel a tingling along your dick, which slowly moves closer to your body, then inside your body. When the tingling stops, you open your eyes again and see that it's now flat where you once had a dick. You rub your hands over your new vagina, confirming its existence.

You're already worried that you'll be late for school, so you quickly go over to your closet to find some clothes for the day. Of course, they're all boys clothes, but you need something more feminine. After thinking for a moment, you know that everyone will be confused about why you are a girl, so you focus on making it such that everyone thinks that you always were one, and you also take your closet and fill it full of clothes that will fit you.

You pick out your outfit for today: a nice pair of black panties and matching bra, a pair of tight jeans that hugs your ass perfectly, and finally, a simple black T-shirt. Now that you are properly dressed, you put on your sneakers and head out the door and head towards your school. You see a few other students from the school, and thankfully none of them are confused about you at all, so you know that your power worked on them.

You rush to your first class: math with Mr. J. It's not usually fun, but today it's even more boring than usual as he just wants the class to review on their own silently for the test. You think you have an idea of how you could make the class even more fun, however...