Just then, the double doors that lead into your room bang open. In strides your sister holding a couple of books and a few sheets of paper. "Hey, sicko, I brought your homew- -"
She stops in mid-stride. You look on, wide-eyed, as her body starts to ripple and transform. The legs of her jeans merge together and shrink as the fabric recedes to form a slit miniskirt with side ties, sequins popping out all over. Her shirt melts away to nothingness, revealing a bra that itself has sequins popping into existence all over it. It's also growing a bit larger, but as it does, her breasts suddenly inflate, growing from nearly unnoticeable bumps into a pair the size of two largish oranges. Gone are the freckles across the bridge of her nose as her skin darkens a bit with an even tan, and a thick layer of makeup coats her face. Her straight, shoulder-length hair lightens to a platinum blonde as it lengthens and magically becomes teased into waves. She seems to get taller as she's forced up on tiptoes by her shoes changing from white sneakers into clear plastic platform heels.
Some kind of repetitive music with a heavy dance beat begins to play. She looks delighted, her glossy pink lips parting into a smile. She sets your homework onto the floor, then struts with a sway over to the pole to begin a routine.
"This is my sister!" you exclaim in the sex fairy's general direction, trying not to look.
"Hey, I said this would happen to any girl younger than your mother," says the fairy, watching her handiwork carefully. "Ooh, she's good. I'm impressed by my own magic."
"What?" Something hits you in the side of the head. You turn and see that lying on the bed by you is the sequined skirt that just bounced off your face, and you glance to see that your sister's lower half is now clad in only a sequined G-string. You avert your eyes, looking down, and say to the sex fairy, "Please, just make an exception for my sister. I'm begging you."
The fairy says nothing for a few seconds, still engrossed in the show, but then turns to you with a pouty expression on her tiny face. "Fine," she sighs. With a gesture, the music stops. Your sister stands next to the pole and blinks a couple of times, then steps forward to get her skirt off the bed.
"Okay, so turn her back to normal," you say.
The fairy rolls her eyes. "I've changed reality," she says, a bit angrily. "This is normal for her right now."
"So just change reality again," you suggest. "Make her go back to what I know as normal."
"Is that a fairy?" your sister asks, looking at the hovering winged woman.
You gasp. "I thought you were invisible to other people!"
"No," says the fairy. "But I've usually either hidden myself, or I'm performing magic that distracts people."
"Yeah, I'll say," you mutter.
"Ooh, what kind of magic?" asks your sister eagerly.
"The good kind," replies the fairy. She glances at you and says, "Actually, I already did something to you. I didn't really mean to change you -- it was part of a spell to try to loosen up your brother."
Your sister chortles. "Yeah, he could use loosening up, I've always thought."
"No, not 'always,'" you blurt.
"What he means," the fairy tries to explain, "is that you haven't always been the way you are right now. You just think you have. What I'm going to do is give you a memory of the way you were before you changed. If you want me to change you back, just say so and I'll do it right away."
She gestures toward your sister, and her eyes go wide as her jaw drops. She looks down at her transformed body, first holding her hands to cup what she now recognizes to be enlarged breasts, then running a hand through her altered hair. She looks back up at the sex fairy...