When you reach them in the kitchen, your father is reading the newspaper and your mother is cooking the dinner. Dad gives a rapid gaze to you and says "o... It seems you have experienced the magic dust" and your mother (who haven't yet see you because she is occupied with the oven) simply asks you "what do you have turned to my dear?"
You are so surprised for this reactions. Why aren't they worried? "I change like this" you say in your girly voice. As she ear your new voice, your mother give you a sight and smile "o well! Since you're a girl nos, help me with the dinner" she asks. You ever more surprised say "can anyone tell me what happened to me and why?" and your mother answers "yes, we'll speak about this for dinner. Now cut thoose zucchinis, please". You do what she asks. When all is ready for dinner you'd father close the newspaper and looking at you says "I think you can't stay half naked with only a loose boy clothe" he snaps his fingers and immediately your t-shirt change in a girly violet dress, long to your knees. Then he touch a rag and you see this changing into white girl panties and wearing you fluctuating in the air. "More appropriated" your father simply says.
Dinner is ready and you all seat. After few minutes you ask again "anyone can tell me what happened?" and your father simply says "you have turned into a 9 years old girl" "I see this... But don't you find it strange?!? How it happened?"
Your mother answers to you "calm down please. Your father is a wizard. I no. We never said to you because we weren't sure if you had your father powers... But it seems you have!"
You haven't understand all and ask "but why am I a girl?" So your father explains "well. I created that dust so that it can change the body of a person who has magical powers. So we can be sure I can teach you using magic. The reason that you are a child again is to lock your potential powers until you know how to use them. Your powers will grow year by year when you'll be again through puberty". You think this is a good reason to grow up again, but not for being female so "when I will be older I can change me back, can't I?" Your father answers "no magician can change its own body and only the wizard who makes a charm can reverse it. The dust won't ever be magic from now on..." so he can you think and ask "you're turning me into a boy again, aren't you?" "I think you have to speak with your mother of this" he says standing up and leaving you alone with her. "Mom?" you ask her to answer and she smiling tells "you see my dear... I allways wanted a daughter. I couldn't imagine you was supposed to grant my wish... But now that you are... You see, I want you to be female forever!" She kisses you. This is not fair you think! "But mom! I don't want to be a girl!" you scream. She calmly answers "honey, you know, when you were a boy you never decided to be male... You simply were. So there's no reason for give you the right to choose your gender. You just have to deal with the fact that you're girl. But don't worry, you'll like it! And while your father will teach you to use magic, I'll teach you to be a good woman!" She smiles at you and then asks you to help her to clean the table. You are crying (ironically: the reaction you have not wanting to be a girl, it's the more girly thing). You ask "what about my friends?" And your mother says "don't worry, princess. Nobody remembers you ever been a boy. And for make it easier, your father will change your friends age, so you can play with them again".
At least you have your friends, you think.