You answered: "I want to be a mermaid, miss". To your sirprise, she asked: "With or without cloths. If you pick without, nobody in the whole universe will ever notice your nudity". Amazed of what she said, You pick without. Suddenly you passed out without to see your transformation.
When you woke up, you noticed that you are a naked mermaid on a wheelchair. Your brown hair are little longer, you've gotten C-cups and a vagina in the end of your tail.