Nothing happened. She laughed. "I guess it was too much to hope for," she said. "It's a good thing I've got some money saved up -- I'm at least going to need new bras." She looked down at her enlarged breasts and used her hands to push them up. "Although it's weird, these kind of feel like they're being supported magically somehow."
I turned away, hoping to hide the bulge in my pants from her. Oh, man, I thought, if only she could be here, but not be related to me somehow.
Out of the corner of my eye, I saw a flash. I turned back to look at her, but her face and her skin color had changed. She had become Asian, although she still had the same voluptuous body. At least now the black hair wasn't incongruous.
I could see the family photos on the hallway wall. They were all the same, except it was as if someone had Photoshopped out my blonde-haired, blue-eyed sister and replaced her with someone completely different. I suddenly put two and two together and figured out that I had somehow managed to change reality itself, and now Tiffany was my obviously adopted sister, so she wasn't technically related to me.
Finally, she stopped playing with her breasts. She hadn't noticed at all, as far as I could tell, when her skin changed to a golden brown color, and her nipples and aureolas darkened to match. She said to me, "I guess I don't have magic power over everything, just my boobs. I still would like that new wardrobe, though."
I shrugged, and tried imagining her with unlimited magic powers, which she'd use starting with giving herself a new wardrobe.