Katie just shook her head and continued looking through the books she had found. They were mostly full of odd nonsense. Arcane incantations, geometric figures, and complicated math equations. She shoved it aside and reached for another book. Maybe she'd get lucky and find the dummies guide to whatever this was.
Tiffany wasn't feeling too good with the changes that had continued to happen to her as Katie ignored her. Her hair had darkened from its original light brown to a lustrous black even darker then Katie's hair. Her breasts were now straining against the containment of her bra. Struggling, she quickly reached behind her and unlatched it and then pulled off her shirt. Looking at a mirror she was amazed to see her eyeteeth had grown into prominent fangs and her tongue was now forked like a serpent's and came a full 6" out of her mouth. Her eyes had also darkened to black. Tiff's horns now poked through her bangs and Tiff knew that she couldn't hide this from Katie. She nearly fell over when Katie looked up from her book and looked at her like nothing was any different. "Quit showing off. I already know you can have anyone you want. So put your shirt back on. I already called you Ms. Top-heavy there's no need to rub it in my face."
Tiff pulled her shirt and though the fabric stretched, it no longer felt like it was going to tear any second. "Katie, don't I look any different to you?" Katie shook her head confused. "Not really, I mean I don't know why you're showing off your demon half right now. Is something wrong?" This time Katie actually sounded concerned but Tiff was confused herself, "My demon half?" Katie nodded, "Yeah, you told me how your father was a demon so you can look like whatever you want. Remember?" Tiff nodded, but she didn't have any recollection of her as half-demon. She would play along and maybe things would make sense.
"Yeah, I guess this house is just really making me nervous. Have you found anything."
Katie nodded as she lifted up a dusty old book with strange marks on the top and the English words on the bottom, a modern approach to magic. Tiff doubted that it could be very modern now or else you'd be able to find it on the internet. Katie looked at Tiff's breasts and pointed at them, "Watch this." Katie then began to say some strange and when she stopped Tiff was shocked to see that Katie's flat chest was swelling from the quick growth of her breasts until they were the same size and Katie's shirt got a tear in it that went from her collar to her belly button. The remaining fabric was stretched tight. "It's a copy spell. I just need to point at what I want to copy and concentrate on where I want it to appear on my body and then say the right words." Tiff could only stare hungrily at what had been a barren field and now held ripe melons. "How did you know how to say it?"
Katie smiled, "There's a pronunciation guide. Well I found what I wanted. How about we get out of here and have some fun tonight?"
Tiff nodded, thinking about what she could do with such magic. Then the same thought crossed both their minds though for different reasons. The fun has just started.