The Heart of Two Moons

By: Sandreline

Hello all my darling readers! I' m back! Once again, I have a brand new story. I hope that you all enjoy this; I don't plan on making it long like my other stories, its going to be only a few chapters. Please feel free to let me know what you think! For new readers: Welcome, and I hope you enjoy!

Disclaimer: I do not own Sailor Moon, it belongs to Naoko Takeuchi. I do not own Sesshomaru, it belongs to Rumiko Takahashi. Both creators are the most talented and amazing people in the world, for granting us the two best manga/anime EVER!

Where does this story take place? From the Sailor Moon line, this story takes place at the end of the Stars season. I will be making a change to fit my story better. For the InuYasha line, this story takes place when Kagome comes back to the past to stay with InuYasha after she graduates from high school. Serenity will be a little older than sixteen in this story.

PS: I cried through the entire last episode of InuYasha: The Final Act. I was so sad to see the show end, but I was so happy that everything worked out wonderfully. Takahashi-sama is a genius! PSS: I love Sesshomaru's mother so much! Haha.

Chapter 1:Once Upon A Time

A thousand years ago…

"Serenity."

She turned at the sound of her name, broken from the thoughts of her birthday ball tonight and what that meant for her future. The princess was kneeling in the royal gardens of the Moon Palace, the skirts from her white gown fanned perfectly around her as she stared off at the planet Earth. Her blue eyes landed on the being who had called her, his god-like form standing just a few feet from her.

"Sesshomaru!" A smile broke across the face of the Lunarian heiress as she gracefully rose and dashed the few feet to who she hoped was to be her Mate. "You came." She purred as she pressed her form against his own, grateful that he was not wearing his usual bone armor. His arms came to wrap around her, his nose inhaling her scent to ensure that she was alright. The dog demon could truly trust only himself to keep her safe, after all. All others were insignificant in strength.

"I will not allow another to have what is mine." He answered her. He had arrived just a moment ago with his father and mother, both of whom were currently speaking with the Moon Queen. Over the past couple of months there had been several suitors for the Lunarian's hand, but the most persistent was Prince Endymion of Elysian. What they all failed to realize was that they had already failed in their endeavors, for Sesshomaru had won the heart of the Moon Princess long ago.

"I will not accept another." She told him, slowly leaning back to remove herself from his being, though still standing close enough to feel the heat from his body.

"Yet that human prince still believes he has a chance." Sesshomaru growled out.

"He tries, yes." She told him honestly. "His efforts are futile."

Sesshomaru smirked proudly at this, offering the Moon Princess his arm. "Come, let us take a walk."

Serenity smiled warmly as she accepted, both of them moving as if they were floating. Her silvery blonde hair appeared more gold when besides the silver locks of the powerful Dog Demon beside her. Even the people of the Moon envied the Prince's hair. "How are your parents?"

"My father continues to be absent often." Sesshomaru spoke, not telling her of his suspicions of his father's infidelity. "We also have been having some trouble with the Dragon Lord of the North."

"Is everything alright?" She asked with great concern.

"It is nothing to concern yourself with. However, I am not pleased upon hearing the rumors of a force that wishes to destroy the Moon." His eyes flashed red for a moment, and Serenity wondered how he constantly managed to keep his regal demeanor.

Serenity turned her gaze to the Earth once more. "Mother has summoned the Outer Senshi."

Sesshomaru bit back a growl. The Outer Senshi were the only members of Serenity's court that Sesshomaru could actually tolerate. They were completely dedicated to their mission and had much stronger powers than those of the Inner Senshi. However, if the Moon Queen was removing them from their posts, then the situation was more dire than they believed. "Then this Sesshomaru shall remain and protect what is his."

Serenity giggled softly. She always adored how he was so confident, and while it was a little possessive, it only reminded her each and every time that he would not ever stray. "Sesshomaru, you must return to take care of your lands as well."

"Ah, there you are Princess." The two turned to find the intruder of their moment. It was Prince Endymion, a human who though himself the ruler of the entire planet. He was most adamant about winning over the affections of the Lunarian princess, and Serenity knew it was only because she was the next ruler of the Galaxy. She believed that not all humans were as greedy as this Prince, but he did try her patience. Sesshomaru was already leveling the black-haired man with a glare. "Lord Sesshomaru, I see that you have returned to the Moon." Endymion added.

"This Sesshomaru sees that you have as well." He spoke, his deep voice cold.

"Yes, well, I was hoping to be able to speak with Serenity alone for a moment." The blue eyes of the human sent a clear message to the dog demon, one that had the inner beast roaring in rage. Thankfully, his Princess was able to calm him as she slid her hand from his arm to his own hand, being mindful of his claws..

"I am afraid I must decline, Prince Endymion." She spoke serenely. "We do hope you enjoy the ball tonight." She meant it as a dismissal, but the human tried again.

"That is what I wish to speak with you about, Princess." He placed a hand on the hilt of his sword as he spoke, attempting to appear strong. "I have asked your Mother for a private audience this afternoon, but I had hoped to discuss the prospect with you first."

Serenity pressed herself against Sesshomaru's side, feeling his powers swirl around his body. She used her own to keep him calm as she addressed the human. "I am sorry, Prince Endymion. However, there are no prospects that I would wish to discuss with you."

Endymion moved to try again before Sesshomaru spoke. "Leave, human, and do not attempt to seek her alone again."

Said human's eyes flashed in anger. "I know of your Mating customs, demon." He spat. "I see no Courting Mark on the Princess's neck, therefore if I wish to Court her, I am within my rights to do so."

Sesshomaru's eyes glowed red at the challenge, but thankfully the trio was interrupted by the arrival of the Outer Senshi. "Princess Serenity." Sailor Uranus smiled. The Wind Warrior turned a cold glare to Endymion. "Excuse us, Terran."

Endymion gave a stiff bow before he turned to leave. Sesshomaru only regained his composure once he could no longer smell the foul human. How many women had that male seduced?

"Lord Sesshomaru, it is wonderful to see you again." The diplomatic tone of Sailor Neptune greeted.

The dog demon nodded in greeting to the two Senshi, before Serenity moved to hug them both. "Welcome back!" She smiled.

"We were on our way to see your Mother, but wanted to see you first." Neptune smiled.

"It's a good thing we did, too." Uranus added. "Want me to have a word with the Terran, Kitten?" She asked.

"No, it's alright." Serenity smiled.

"We will see you at the ball tonight." Neptune added as she led her partner away.

"Take care of our Princess, Dog!" Uranus added.

Sesshomaru did not reply, instead he brought the Lunarian with him as they continued on their walk. Lunarian guards were posted every so often. There were more than normal, which served as a reminder to the dog demon that there was danger to his chosen lurking about.

"Serenity," He spoke, his voice deep and strong. He brought her to a bench in the gardens, having her sit. He stood before her, his silver hair and the sleeves of his kimono fluttering slightly in the breeze. "There is something that we must discuss."

Serenity nodded. "What is it?"

His gold eyes locked onto her blue ones. "You know how this one feels about you. My beast and I have chosen you to be our Mate. Do you understand what this means?" He asked her.

Serenity's heart skipped a beat. Courting rituals on Earth varied by the type of demon or human society. When she first met Sesshomaru and became infatuated with him, her curiosity about his race was incredible. She had enlisted the help of Sailor Mercury to find out his history about the story of his people. Dog demons Mated for life – whomever they chose would be loved and cherished for all time. It was not something that one did recklessly, and sometimes it could take hundreds of years to find our Mate. "I do."

Sesshomaru glanced out of the corner of his eyes. He could not scent anyone around them, but he knew his mother and father could hide their scents. He wanted no witnesses to the position he was about to place himself in. Slowly he lowered himself to one knee, as was the custom of her people. "I wish to take you, Serenity of the Moon, as my Mate. Will you do this Sesshomaru the honor and become the future Lady of the Western Lands?"

Serenity was silent, her eyes wide as they sparkled with unshed tears. The dog demon grew worried at her response, and concerned when her heart rate sped up considerable. If not for his superior skills, he would have been knocked to the ground when she leapt into him, her arms around his neck as she chanted out, "Yes!"

He picked her up so they were both standing once more, holding her in his arms as he looked down at her. As if already knowing his demand, she tilted her head to the side. Her strapless dress allowed her entire bare neck and shoulders to be subjected to him, and him alone. His eyes glowed red as he sank his fangs into the creamy skin between her neck and shoulder, his energy pouring into her blood to mix with her own.

When he finally pulled back and his eyes had returned to gold, he found happy yet now tired eyes of his future Mate looking up at him. Letting a small rumbled come from his chest, he licked up the little blood that had escaped his mouth from her shoulder, nodding in approval of the two purple fang marks and the blue crescent moon that was slowly darkening.

"Come, we shall inform our parents."

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The Queen of the Moon smiled warmly as the great Inu No Taisho slapped his son on the back. "Well done, my boy!" He stated. "I always wanted a daughter." He turned to the Princess, who was blushing slightly. "My son could not have chosen a better female to be his Mate."

"Finally!" The Lady Mother spoke. She was sitting elegantly beside the Moon Queen on the couch. "I feared that he would never find a Mate just to spite me."

"Mother..." Sesshomaru's voice warned.

"We will announce it formally at the ball tonight." Queen Selenity added, her silver hair appearing very lavender from beside Sesshomaru's mother. "And the Western Lands will forever be added into the Silver Alliance."

A knocking from the door interrupted the celebration. It was the servant of the Queen's General. "My Lady, a message from Earth to the Inu No Taisho!" He stated, handing over a sealed parchment.

The Queen nodded and excused him, passing the document to the Dog General. As the fearsome Lord read it his face grew more grim. "What is it?" The Lady Mother asked.

"We must leave at once." He stated. "Ryuukotsei is attacking the borders. He wants to take over the Western Lands."

Sesshomaru's expression did not change. "I will stay."

"No, Sesshomaru." His mother spoke.

"I will need you at the Western Citadel." The General spoke. "I will take most of our forces and meet Ryuukotsei at the border. You will remain with the rest, incase it is a diversion."

"I will not leave my intended." Sesshomaru stated.

Serenity placed both her hands around Sesshomaru's arm, willing him to look at her. Giving a brave smile, she spoke. "I will be safe." She told him. "There is no place safer than the Moon."

Sesshomaru appeared torn, before his sense of duty spoke up. "I shall return the second this is over." He told her. He lifted his left wrist, were a gold beaded bracelet was on his wrist. It carried a small amount of his demon energy – a Courting gift, for her. He placed it on her right hand, the gold standing boldly against her pale flesh. The Queen and the two dog demons removed themselves from the room to gather the belongings of the family.

Serenity held back the tears in her eyes. She hated when Sesshomaru had to leave; it was worse now that they were betrothed. "Promise me that you will be safe."

"No harm shall come to this Sesshomaru." The reference to himself in the third person allowed her the barest of smiles. His manner of speaking is what prompted her to speak to him for the first time, many years ago. He had been all but impossible to speak with, usually leveling others with a glare to keep them away from him. However, it would seem that even the superior Sesshomaru was unable to escape the charms of the Moon Princess. It was an interesting relationship they had, and the dog demon could say that she was the first person to truly care for him. Most of the daughters of nobles that he had met had only tried to flatter him as their fathers tried to make a marriage treaty. It would never work – the females would always leave in tears. She did not fear him, and instead added to his strength. Only she was worthy for him.

"Hurry back to me." She whispered.

Sesshomaru leaned down, pressing the crescent moon on his forehead to her own while he inhale her scent. "You are mine."

Serenity smiled. "And you are mine."

Sesshomaru growled as he claimed the Lunarian's lips in a kiss. It was only the briefest of moments, despite that it felt like forever. He was gone when she opened her eyes, moving to gather his belongings.

Serenity stood beside her Mother at the portal, her eyes locked on Sesshomaru as they bid the Demon family farewell. Wishing them luck, they disappearing in silver light. The Moon Queen turned to her daughter, placing a comforting hand on her un-bitten shoulder. "Come, let us tell the Senshi. I am sure that Venus will be eager to begin planning the wedding." Serenity smiled softly as she placed two fingers on the Courting mark, still able to feel Sesshomaru's presence.

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It was not to be. That night at the ball, before the announcement could even be made, the Moon Kingdom was attacked. She called herself Queen Beryl, but she was recognized as a noble of the Elysian Court who was Prince Endymion's courtesan. She swore vengeance on the Moon for the Princess stealing Endymion's heart. The Senshi were scattered; some of them were fighting the Shadow demon, and some of them were fighting the former Generals of Earth that had been corrupted.

Beryl had cornered the Moon Princess on the halls of the Palace, surrounded by wreckage. The Lunarian's Courting mark was burning, making the Princess loose focus. Her intended knew of her danger, and was trying to help her. She could feel his powers, but it burned her terribly as she tried to fight the evil sorceress. Endymion, in an attempt to subdue his courtesan, was killed. Beryl went into a fit of rage at the site of her lover's body crumbling before her, and used Serenity's surprise as a distraction to finally kill her.

On Earth, Sesshomaru felt the loss of his Mate. His eyes bled red as his energy swirled around him. His mother watched as a large white dog filled the courtyard, and she knew that if he was this size at his age, he would someday surpass his father. Not knowing the events on the Moon, she assumed her son was training himself. She was unaware of his bloodlust coming through as he let out a mournful howl and took off to the skies.

The rubble and destruction of the Moon Kingdom was unimaginable. Queen Selenity was gasping for breath as she reached the site of her daughter's body, the two feline advisors both sobbing at her feet.

"No," Selenity cried. "I won't let it end this way." Using the last powers she held, the Queen gave her life to allow her daughter and the Senshi to be reborn, for another chance at life. She only prayed that her child would one day again find her Mate.

It was not until the Moon Queen closed her eyes forever that Sesshomaru appeared on the Moon in golden light. No matter how hard he looked, he could not find his Serenity. He vowed, then and there, that he would never have another. For there was no other that was his equal in any way; no one like his Serenity.

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Present Day:

She did it. Sailor Cosmos floated in the air before the Cauldron. She was torn, beaten, and bloody. Her wings were battered, and she briefly wondered how they had the energy to keep her afloat.

The battle had been indescribable. Her friends were dead, each and every one. They had given their lives for her own, despite her wishes. With their sacrifice they had granted her their star seeds. Not only did it enrage Galaxia, as they were not lost to her forever, but it had also changed her into the ultimate being. She was now Sailor Cosmos, the protector of Balance and the Keeper of Light.

But she was alone. Her blue eyes lowered in sadness, and yet no tears spilled. She had purged Galaxia of Chaos and defeated her ultimate enemy, but at what price?

"I can grant you a choice." Came a voice.

Sailor Cosmos turned to the Cauldron, surprised to see a small being with fairy wings floating before her. "Who are you?" She asked.

"I am the Guardian of the Cauldron." She stated. "For your deeds, I shall grant you a choice. You may choose to enter the Cauldron yourself and be reborn back on Earth. Or, you may continue to stay as you are and travel to another time and find what you have lost."

Sailor Cosmos was confused. "What do you mean?"

The Guardian smiled. "Your friends cannot be reborn, for they have given you their Star Seeds. However, your planet can be repaired and you can return to your family. You will remain as Sailor Cosmos, but you will only be called upon for true peril."

"How can I gain what I have lost, if my friends cannot be reborn?" Cosmos asked.

The Cauldron took on a motherly tone. "You have lost something from your past. It is not all as it seems. Your true love is still out there, waiting for you in the past."

Sailor Cosmos sucked in a breath. Was it not Mamoru? Had she not seen her future with him, remembered a past with him?

"The choice is yours."

A soft, orange glow came from the Crystal at her chest. She could feel the energy of Venus as the love of her friends filled her heart. She thought it over for a long period of time, before turning to the Cauldron. "I wish to find what I have lost."

The fairy smiled and began to glow with a great pink light. Sailor Cosmos remembered no more.

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500 years in the past…

The sun was beginning to set. Kagome and InuYasha were standing beside each other on a cliff overlooking the town of Edo, which would one day be the city of Tokyo. Kagome was finally happy; she had been able to return to the past to be with InuYasha and her friends. She and InuYasha were bound towards tomorrow.

InuYasha wrapped an arm around her waist, nuzzling her neck. He had placed his Courting mark on her earlier that day, and when they finally mated she would gain his life span. The two gazed happily into each other's eyes, merely enjoying being in each other's presence.

The night sky was suddenly blinding as a light forced the couple to cover their eyes. When they were able to look, fear gripped Kagome's heart. The glow was coming from the Bone Eater's well.

"That's some power." InuYasha growled. "Come on!" Kagome nodded as she climbed on his back.

They arrived just a couple minutes later, the glow still bright but no longer blinding. Miroku and Sango appeared, both ready for battle. Kagome was worried about Sango, who was holding Hiraikotsu. She had just recently given birth, after all. They must have left the three little ones with Kaede.

"What's going on?" Sango asked.

"Kami-sama…" Miroku stated as he pointed to the well.

Four pairs of eyes turned to the Well. The source of the glow was not only the Well, but the winged woman that was floating above it. She was clearly unconscious, and her silver hair floated around her as if she was in a breeze. Her white dress and gold ornaments were very familiar to Kagome, but she could not remember from where.

"Who is that?" InuYasha asked.

Suddenly, the glow ceased, and the woman was gently lowered to the ground. The group approached her slowly, quickly taking not of her injuries. "She's hurt!" Kagome stated as her healing instincts kicked in.

"I've never seen a demon like her." Sango stated as she lowered her boomerang. "But she has the mark of a royal on her forehead." The Taijiya pointed to the Eight-pointed star that was faintly glowing on the brow of the woman, and they watched as it changed into a golden, upturned crescent moon.

"We should get her to Kaede." Kagome stated as she knelt beside the woman, relieved to see that she was breathing. "She's injured pretty badly." Suddenly, the memory returned as she closely observed the mark on the woman's brow. "Oh my Kami!" Kagome exclaimed, standing up suddenly.

InuYasha drew the Tetsusaiga. "What is it?"

"It's Sailor Moon!" Kagome suddenly had stars in her eyes as she cheered. "It's really Sailor Moon!"

"Who?" Miroku asked as he used a finger to scratch the side of his head in confusion.

"She's the super hero that protects Japan!" She said. "She fights monsters and aliens!"

"Kagome, I though that you said there were no demons in your time?" Sango inquired. "What's an alien?"

"From what I could tell, no. However, these demons are different. They are aliens, which means they come from outer space. Sailor Moon and the Sailor Scouts protect us from them." Kagome's eyes filled with worry. "How did she get here?" The Miko turned to the Well. "I didn't think that it worked."

"Feh," InuYasha grumbled before replacing his sword at his side. "Let's just get her to Kaede." Mindful of her wings, the dog hanyou gently picked up the unconscious woman.

The feeling of being jostled caused Sailor Cosmos to open her eyes for a moment and gaze into a head of silver hair. "Taisho…"

InuYasha froze as the woman drifted off into unconsciousness once more. Had she just called him by his father's name? Who was this wench?

"InuYasha, come on!" Kagome called to her future Mate from beside Sango and Miroku. "She needs medical attention!"

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SO? What do you all think? I hope that you all like it, and that I blended the two stories together well. Please let me know what you think! I would greatly appreciate any feedback. I have been wanting to do a Sailor Moon / InuYasha crossover for so long! I am so happy to finally be doing it.

Please review so I know what you think!

~Sandreline