Mary walked back to where she placed the vials on the table in her living room. As she scanned the labels, searching for another animal form to try out, she felt a pain in the bottom of her spine. At first she thought her back had suddenly given out, but as she heard and felt something cracking her spine at its base, she realized it was something else.
She pulled her pajama pants off to feel the area above her buttocks. Sure enough, something was pulling its way out of her back. Slowly she felt a thin rope of flesh extend from her tailbone. Fur quickly blossomed on it, turning a golden brown. As it grew it began to shift in the air, curving this way and that. Mary realized that, with enough concentration, she could control its movements.
It was longer than two feet before its growth subsided. Her new lion tail was complete with a thick tuft of red hair at its end.
Mary stood still for a few minutes, now completely naked, enjoying the sensation of it brushing against her legs and waving about in the air. She lazily walked around the room, finding how it moved to help her balance even better than she could before. She was practically gliding on her feet, feeling the sway of her tail behind her and the mane on her bare shoulders.
As she danced, she lost interest in the other vials, no longer caring to have any form other than that of a lioness. She felt proud, confident and strong.
When she finally stopped, she realized how hungry she was. Mary hadn't eaten yet today, and it was past noon. Her tongue lashed around her lips as she patted her stomach, eager to find a decent helping of meat.