"Believe me, Millie; I would just LOVE to have my brains fucked out by a mermaid..." Emma began.
"Oh, I know;" Millie Interrupted; "just as I know you first realized you were a lesbian after having that wet dream about the H2O girls when you were 13. Now, let's make that dream come true!"
Emma again paused Millie's advances. "What I mean to say is... I want to know what happened. How did you become a mermaid in the first place.
"Well, I was at the beach," Millie began, "swimming as I usually did this time of day, when I heard this... impossibly beautiful song that echoed loud and clear as a bell; around me, through me, even from within me! I looked around to see if anyone else noticed it; but they never so much as twitched their ears. Clearly this song was meant for me, and me alone. I just HAD to sing along to it: and sing I did!"
Millie continued. "I sang my heart and soul out; and still, no one noticed, not even a little girl who paddled just past me. That was when I changed."
"Did you ever find out who or what sang the song?" Emma asked.
"Didn't really think to look for the source." Millie answered. "I was so enraptured by my transformation, until I realized I had to show this to you. Fortunately for me, I knew that I could change back and forth at will; and lucky for you, I know the exact song that gave me this power by heart." Emma knew Millie was about to start singing.