You had started to hear weird stories circling around about Mermaids in the ocean near your home, and of girls that where going missing. You didn't think much of it until your best friend Mary vanished, then you knew you had to get to the bottom of this.
You jump into the water, your bikini covering your C-cup breasts as you look around, trying to find any sign of your friend.
"Terry..." a voice says, you can hear it plainly and turn to see what looks like Mary, but you see a bit of green before you black out.
When you wake up, you're startled to see Mary kissing you, you're above the water, on a secluded beach. You notice that a green tail is behind her, you guessed that those rumors weren't just rumors.
"Mary, what happened to you?" You gasp out, looking down you realize you're naked.
"Oh, you'll see," she says with a giggle, and re-enters the ocean. You try to stand up, only to fall back down, looking back you see that your legs are starting to connect, turning green.
"What did you do to me?" You demand as your feet become fins, and Mary gives you a splash of water, flicking her tail. "I'm... a Mermaid?"
"That's right," Mary says, as you struggle to get into the water. "And you'll enjoy it too."
You dive into the water, and swim alongside Mary, going to join your sisters.