Both girls bring their necklaces and head to the pool, wearing only a bikini top and making sure to not look at each other. As they put their necklaces on, they both become mermaids and are able to stare at each other again.
"Amazing! I look just like I imagined it!" Amy shouts.
Lina begins to swim deeply, almost touching the floor, and Amy follows her. However, they both notice the necklaces have dissapeared.
"Wait, where are our necklaces?" Lina wonders, realizing she can talk and hear properly underwater.
"Oh my god, please don't tell me we're stuck like that..." says Amy, worried.
Freaking out, they swim to the surface, but the moment they touch air again, the necklaces reappear. Soon, they're happily swimming again.
"I guess the necklaces vanish underwater so they can't come off." Amy points out.
The girls spend all the afternoon swimming and playing with the water. They do not realize, though, that the necklaces did some further changes to them. They aged slightly, now both of them in their early twenties, their hair has grown longer, as well as their tails. Their bikini top adjusted to their new size. And some more drastic changes happened...