"I'm afraid I stole your aura," she said as you stare. You look at her skin and then back at your own skin. "Oh, you've noticed. Yes, the aura manifests physically in you, but in me it manifests as growing my butt. What aura do I mean? Simply, your human aura. I've taken it, or, rather, you willingly gave it to me."
She struts around the room with her hands on her ass, and from where you sit on the comfortable cushions, you can't help but notice how its contour is even more pronounced than it used to be. "The big, round gluteus is unique to humans because of the way we move. Over the millennia, we began to see the gluteus as a sexy object, even though it has nothing to do with sex. In taking your human aura, I've made this part of my body, this uniquely human part of my body, greater. And you need to be aware that without it, you will also change."
You glance at your own posterior and she laughs. "No, not like that." She is still so cute, but she is telling you how she betrayed you. You don't want to believe it. You won't want to believe that you will change. But you cannot deny that you felt and now see the change in her body. There must be some truth to what she is telling you.
"Without your human aura, you must revert to something more primitive. You must become something unhuman. I can see your whole body starting to quiver, because it is no longer its own true form." She laughs, and a touch of cruelty leaks out. "Just think, your life as a human is worth the same as a few cubic inches in my ass."
You feel anger rising at her comment, and you rise as if to attack her. But as you do, you feel your body begin to change, and your skin feels cold. You huddle your arms around your body and look at yourself in fear. The changes have started!