You thought for a moment; she did say she wanted to turn you into a merMAID, and she certainly has fun with you when you were still a mermaid pool toy as did you; you had to ask.
"Would you prefer I remained a merman, or would you rather I be a mermaid?"
"While I am bisexual, like most mermaids," she said, "I do prefer the company of girls over guys."
You thought about it again and, putting your hand on her shoulder you...