A/N: Review and tell me what you think, please!
"Are you…Queen Serenity?" Bunny faced the girl with a mixture of fear and apprehension on her face.
Opal's smile faltered, and was replaced by a look of surprise? "Me? No. I am Princess Tranquility, eldest daughter of Queen Serenity and true heir to the Silver Moon Throne." Bunny stared at her newfound older sister in horror.
Ami, however, was processing all the information quickly. "A mermaid princess?" she wondered aloud, causing Opal-Tranquility to start, and Ami's teammates to exchange looks.
"Weird much? Just how the heck do you get 'mermaid princess' out of 'moon princess'?" Minako demanded.
"Earlier, she defeated the monsters with a single song – it's well known that the mermaidian people fight with their voices – and among them, the princesses end their songs with a trademark phrase ending in "PITCH." Not to mention, Mina, you said she wouldn't go swimming. If she's a mermaid, then she won't go swimming around anyone else."
The newly revealed Princess Tranquility looked at Ami with admiration. "You're good," she admitted. "I am the Mermaid Princess of the Sea of Serenity. You might note that as a Princess, I have a pearl – though it rather looks like an opal in my tiara, huh?" she removed the aforementioned ornament, revealing the mark of Moon royalty underneath. On her forehead was a small crescent moon, like Eternal Sailor Moon's, but silver and it had two tiny stars at each of its points.
"Eh?" Makoto said, "But why is your moon different than Bunny's? And why did you say "Silver Moon?" What gives?"
Tranquility sighed, and looked around. "No one will miss us if we leave school, and I'd prefer to tell you in private. Meet me in the woods," she said, jumping off.
When they arrived in the clearing in the woods, she nodded. "I suppose it's time I told you the truth.
"Long ago, in the days of the Silver Millennium, I was Princess Tranquility, heir of the Silver Moon Throne and Princess Serena was my younger half-sister.
"My father was from Earth. He was not a regular earthling, no. He was a merman – one of the last, for the mermaid world is made up almost solely of females and there are only a few boys every thousand years. But he was one, and he was my father. I was born on the moon, but I am the Mermaid Princess of the Sea of Serenity, the Silver Pearl Voice."
"Pardon the interruption," Ami interjected, "but how can this be a pearl? It seems more like a crystal or diamond," she said, waving around the tiara she was still holding.
"Ah, you see, a Mermaid Princess's magic pearl is created from the first tear they ever shed. But crying is also the way one releases their heart's crystal, like how each Moon royal has the Silver Crystal. So my pearl is kinda crystal-like.
"Okay, okay, but back to you story!" Minako said impatiently.
Tranquility nodded her agreement. "Alright. Anyway, I'm half mermaid, but I'm the oldest daughter of Queen Serenity. Bunny - or rather, Princess Serena, you're my younger half-sister. I never met your father – on Mom knows who he is.
"When you were born, there was this big uproar. I don't think you ever noticed, but the first couple years of your life, you were treated as an illegitimate child 'cause you were born mere months after my dad died.
"Eventually, I couldn't stand it anymore. You were just too young. So I lied. I said that you were the legitimate one, that my parents never married and Dad was just some guy – this was believable because Dad hated the moon and spent most of his time swimming on Earth anyway. I said that Mom married your dad in a private ceremony but that he died really soon after the wedding.
"This story had an immediate effect. I was soon shunned while you were praised. Before I 'admitted,' I was preparing to go to Earth as an ambassador because Earth was getting kinda unfriendly towards us Moon people. Afterwards, they totally rebelled. I was supposed to be the symbol of peace, purity, and goodwill from the Moon, so they got pretty upset at my 'confession' – I even heard of plans to assassinate me.
"I had to do something fast. So I started faking a cough that progressed quickly in pneumonia. After I 'died,' I left and went to Earth to train my mermaid half. I trained for years, out alone in the ocean. When I finally came into contact with other people, I learned of a planned attack on the Moon Kingdom – the unrest hadn't settled down even though I was gone. I arrived back at the Moon too late to stop the attack. The only thing I could do was defeat this 'Queen Beryl' lady as she attacked. I defeated her, but I was mortally wounded. You and your Senshi had almost been killed by other forces. Mom couldn't bear it – she used her Silver Crystal to send everyone to the future in hope that we could live normal lives.
"In answer to your other question, the 'Silver Moon' and the 'Silver Throne' are the true names, for we were not merely the 'Moon," but we were the 'Silver Moon,' leaders in the Silver Millennium. However, after I left, they dropped the 'Silver' off many titles," the Silver Pearl Voice finished to looks of awe.
Since no one else was saying anything, she collected her tiara from Ami, nodded goodbye, and seemed to jump away into the darkness, though in reality she was merely jumping higher up into the trees so the other girls couldn't see her. Below, the other Senshi were talking about how surprised they were. Bunny way saying how it all made sense, while Rei was asking why they didn't remember any of this, to which Luna replied that Queen Serenity probably didn't want them to remember the pain.
From her perch above, Opal watched them leave. She was happy that they didn't remember, and that they didn't think of a few other details – like when Princess Tranquility gave up her royal life to protect her younger sister, she had been only six years old.
While she watched them, a new figured lit down on a branch next to Opal. He was slightly taller than she was, with reddish-blonde hair tied back in a ponytail. His ears were pointed, he had wings coming out of his back, and he was glowing slightly. "Now that was a shame. They didn't even get to hear the end of your story," he observed.
Opal rolled her eyes at Raidon. "Well, it was still all true. I just…left some stuff out, that's all," she informed her guardian-partner.