Liara tells you to close your eyes.
"Every mermaid starts out as a human," she said. "Girls and women who believe that they're soul belongs in the ocean. I was once like you. A young woman desperate to become something more. I reached inside myself and found something. I unleashed it and before I know I sprouted this." Liara flicks her tail. "Your mermaid soul is buried deep inside you, but the choice is yours to release it."
You remember that feeling you had when you rescued her. You focus on that, remembering your love of mermaids when you were a child. Breaking up with boyfriends because they thought you were too weird. Swimming with fake mermaid tails with your girlfriends at your pool. Learning everything there is to know about the ocean. Rescuing Liara and then kissing her...
"🎶ooooohhhhh🎶" What was that? Did you just sang? How can that be? You suck at singing! You yelp in shock. Liara is smiling.
You somehow feel...horny. You try to hide your sudden orgasm but couldn't. You release it in song.
"🎶OOOHHHaaaaaaAAAAhhhhhOOOOO🎶"
You're legs suddenly feel numb. You toes begin to move up and down as you can't separate your legs. You spread out your arms while continuing your opera like siren song. Liara quickly helps you remove your clothes.
"🎶AHoAHoAHoAHoAAAHHH🎶" Your breast quickly expands two cup sizes. Your legs start to fuse together. Suddenly, pink scales start popping up all over what's left of your legs.
You let out a large grunt like orgasm as yellow flowers erupt from your nipples. Your new tail seems to curl inwards. Liara holds you so you won't fall off.
"🎶AAAAAAAAHHHHHHHHHH🎶" You let out a high pitched musical note as your new fin erupts from your newly sprouted tail.
You have unleashed your inner mer and are now a beautiful mermaid!
You are so overjoyed, that you sing your heart out. Liara holds your hand and joins in.