Corey stroked your cheek. "I know what to do first." she said as she dove underwater. As you followed her, the other mermaids close behind you, Polly said, "Don't go too far, you don't know these waters well enough, yet." The waters were getting darker as you descended, but, soon, you saw a yellow and green light. It was Corey luminescing. This was followed by the others lighting themselves, as well.
Out of instinct, you, too luminesced; your combined radiance lighting the way as you return to the cavern where your feelings first came to the surface. Corey met you there, right next to her was the seashell you both reached for, yesterday. "I thought this would be an appropriate place for our first time, Millie."
You smiled. "I didn't know you were such a romantic."
The other mermaids arrived to see you and Corey pulling each other in for a passionate kiss.