Disclaimer: I do not own Sailor Moon. Sailor Moon is owned by the great Naoko Takeuchi. I only own this story. Also, I'm going to be using the English dubbed names for this story. This story takes place about two years after Sailor Stars.

Luna's plan

To say that Ami, Lita, Mina, Artemis and Luna were getting tired with Serena and Rei and their constant bickering was a humongous understatement. Ever since Rei and Serena had met five years, they were constantly fought one with it another. Be it over Darien, Rei's manga collection, Serena's grades, Serena's "bottomless stomach" (Rei's nickname for Serena's ability to eat almost anything), Serena's inability to arrive on-time or een Serena's lack of fighting skills; you name it, they fought over it.

At first, everyone found Serena and Rei's fights amusing. And who wouldn't? At first, they just seemed like a case of sibling rivalry.

But lately, Rei had really gotten out-of-hand. Instead of fighting with her princess like a sister would, Rei had become really frustrated with the reincarnated Moon Princess. She would berate her princess, calling her a glutton (even though the reason why Serena ate so much was because she used a lot of energy in battle). Or she accused her princess of being stupid (even though Serena's grades had greatly improved over the last few months because of the help that Ami, Darien and Andrew had given her). Or she would call her Serena a stupid, Meatball Head. And if those things didn't work, Rei would claim that Serena was constantly in detention (even though Serena hadn't been sent to detention since her junior year of high school, which was two years ago). Not only that, but Rei believed that Serena only cared about one thing – marrying Darien and living happily ever after. To the casual observer, it appeared that Rei hated Serena.

But Rei didn't hate Serena. The reality was that she had fallen in love with her princess.

Over the last two years, Serena had grown into a very lovely woman. She had curves in all the right places, her legs (which already seemed to go on forever) had filled out perfectly. Her hair (which had been blonde) had now started to turn into a lovely shade of silver. But what Rei really loved her princess was her cerulean eyes.

Whenever Rei looked into Serena's eyes, she would silently dream about how wonderful it would be if Serena was hers.

Unfortunately for the Senshi of Mars, Serena belonged to Darien. Or did she?

Although the Senshi remembered most of their past lives, they didn't remember everything. The one thing they really didn't remember was that during the Silver Millennium, the Moon Princess and Sailor Mars were lovers.

However, towards the end of the Silver Millennium, relations between the Moon and the Earth had deteriorated so badly that in order to prevent a war, Queen Selenity proposed a marriage between her daughter, Princess Serenity, and Endyimon – the Prince of the Earth.

However, as soon as it was announced that Serenity and Endyimon would marry – Queen Beryl launched a surprise attack against the Moon Kingdom.

But now, the Sailor Senshi were living in peace. They had defeated all of their enemies and weren't expecting any more to show up. And because the Sailor Senshi thought they had finally achieved peace, they decided to live out their lives until it was time for the Great Freeze. Unfortunately for Rei, that meant she had to deal with Serena and Darien's relationship.

However, what Rei did not know, was that Darien and Serena's relationship wasn't as Rock Solid as it had once been. Over the last few weeks, Serena had been having dreams of an unknown woman calling out to her to "remember her true love." But tried as she might, Serena couldn't make out who this dream woman was.

Well, because of these of dreams, Serena had begun to question her relationship with Darien. However, if she dumped Darien, Rini would not be born. And Serena, as any mother would, loved her daughter, and she didn't want to deprive her daughter of life.

Well, because of Rei's sexual frustrations, as well as Serena's dilemma, Rei and Serena's normally "sister fight" were starting to out of hand. In fact, their fights had gotten so bad that Serena was thinking of stripping Rei of her powers and giving them to Molly.

Well, after witnessing Rei and Serena's latest fight, and hearing what Serena was planning to do, Luna decided to teach Serena and Rei a lesson they would never forget. She would take Serena's soul out of her body and place it into Rei's, while simultaneously taking Rei's soul out of her body and putting into the body of Sailor Moon. And she would not undo the spell until Rei and Serena resolved their issues.

Now, this action was not unheard of. During the Silver Millennium, the Sailor Senshi would often fight with each other. And whenever their fights began to get out of hand, Queen Selenity would switch the souls of the Sailor Senshi. For example, there were a few times where Sailor Venus had to be Sailor Mercury and vise-versa. There were times when Sailor Jupiter was forced to be Sailor Neptune and vise-versa. In fact, this happened so often that by the end of the Silver Millennium every Senshi – except for Mars and the Moon Princess – had been forced to live the life of one of their fellow Senshi, often times with hilarious results.

Well, because Rei and Serena were getting out of hand, Luna decided that it was time for them to experience what their fellow Senshi had been forced to experience. They were going to have to be each other.

And so, on the Friday after their last High School exam, Luna – as Serena and Rei quietly slept – asked the Silver Crystal to switch Serena and Rei. And the Silver Crystal agreed to do so. As so as Serena and Rei and slept, their souls were taken out of their bodies and put into the other ones bodies. And until Serena and Rei had resolved their differences – Serena would now have to be Rei, while Rei would have to be Serena.

But what the Silver Crystal did not inform Luna was not that only had Serena and Rei been switched, their Senshi powers were also switched. This meant that Serena was now Sailor Mars and Rei was now Sailor Moon. Of course Luna, at the time, did not know this. All she knew was that Serena was now Rei and Rei was now Serena. And she took in what she had done, thinking that Serena would renew their friendship before things got out of hand.

But what Luna did not know was that this switch would do more than just help Serena and Rei renew their friendship, it would also bring back long-forgotten memories.

And this is where our story begins….