"Let me try one more time," said Olivia. "I'm sure it's just a matter of practice." She pointed her staff at the two of you once again and concentrated with all her might. A green flash blinded you and Wendy. Once it subsided, you saw that the two of you still hadn't changed... but Olivia had.
Where there had once been a mighty orca tail, there was now just a pair of ordinary human legs. The fins had vanished from her arms and back, and her claws and fangs had blunted into normal human nails and teeth. Her towering dick had dissolved into a pussy. She was still quite pretty, but it was nothing like the otherworldly beauty she had possessed before. Her once-enormous breasts had shrunk into C-cups, and her hips had narrowed slightly. Her formerly muscular physique had also softened and shrunk, losing its toned definition. Even Olivia's hair had shortened to shoulder length and seemed to have lost some of its shiny sleekness. Olivia had transformed herself back into a human.
Wendy put a hand to her mouth and pointed. "O-Olivia! Y-your tail! It's... gone!"
Olivia glanced down and screamed. "Oh my God, oh my God, OH MY FUCKING GOD!!! What have I DONE?!!" She leaped behind the rock she'd been sitting on. "Don't look at me! I'm hideous!" Wendy peeked around the rock. She saw Olivia waving the staff over her new legs to no avail.
"Why won't it do anything?!" Olivia wailed.
"I guess you lost your magic when you turned back into a human," you guessed.
"What am I going to do?" Olivia sighed defeatedly. "I don't want to go back to being a human. And now I've REALLY fucked up your transformations!"
"Don't worry, Olivia," you said. "I'm... I'm sure there's a way to fix this."