My Little Diseases

Luna quickly landed on the balcony of Celesria’s bedroom, her breathing shaky, her eyes glossy, her fur having drops of Rarity’s blood on it.
The moon princess scrambled to wipe it off, tears running down her face as she thinks back to what she just did.

Rarity’s screams echoed in her mind, Everyone’s cries in protest as Luna performed the transplant. It all played in a loop in Luna’s head. Her breathing continued to get heavier, until her thoughts were cut short with the sound of Celestia’s voice bringing her back to reality.

“Is it done?” Celestia asked. Her back facing the balcony as she read through some recently received scrolls of upcoming events and meetings.
Luna didn't respond at first, instead just walking into the room, beginning to weep as she shakily walked over to her older sister.

She rested her head on Celestia’s shoulder, sobbing quietly.
Celestia looked over at Luna once she rested her head there, putting one of her wings over Luna’s shaking body, before her gaze returned to her papers.

“I asked you a question, sister.” Celestia says in a nonchalant tone, not sounding concerned about Luna’s wellbeing.
Luna simply nodded. Before standing up, shaking Celestia’s wing off of her.

“I… I'm fine… So is Twilight. The horn transplant went smoothly, and Twilight is on the road to make a full recovery…” Luna responded, looking at Celestia with her ears folded back. Giving a soft sniffle.

“Rarity’s dead.” Luna quickly states. “She sacrificed herself for Twilight’s life. She went through with the horn transplant. She wrote a goodbye letter to her little sister, before going through with it. A funeral will be held for her.”

Celestia’s eyes widened slightly at Luna’s news of Rarity’s demise.
“I'm sure the funeral will be lovely.” Celestia simply replied, giving a dismissive wave as she continued to read her papers.

Luna scrunched up her nose, her ears folding back, looking almost disgusted at Celestia’s response to the situation.
“You should have been the one to go. Sister. Twilight Sparkle needed you, she was on her death bed when I arrived. She should have been able to be saved by the princess that practically raised her as her student and taught her everything she knows today.”

Luna spoke in an upset and annoyed tone. Looking very upset at Celestia. She began to circle Celestia, but she paid Luna no mind, instead, continuing to read her papers, as well as beginning to write response scrolls to some of her papers to send off later that next day.

“I wouldn't have made a difference if you or I went, Luna. We’re both alicorns, we both would have been able to perform the transplant.”
Celestia responded coldly, looking up at Luna for a moment with an annoyed look, before turning back to her papers once more.
Celestia then turned to Luna, raising an eyebrow.
“Go and rest Luna. You’re tired, you have your duties to attend to later tonight.” Celestia almost demanded, pointing toward the door, while keeping her eye on Luna.

Luna refused to leave, getting angry at Celestia for not realising how serious this all is.
“Twilight NEEDED you, sister. Twilight has done everything you asked of her, protected Equestria from so many threats, and yet you refused to go and help her when she needed YOU!”
Luna snapped, snarling at her sister as she spoke, looking disgusted at how calm Celestia was.

“You need to understand sister. I'm over 1000 years old. My wings aren't what they used to be. It was better if you went because you would have got there a lot faster than I would.” Celestia tried to explain, but Luna simply rolled her eyes.

Celestia had been using that excuse every time Twilight needed something, whether it was help during a battle, or just a simple walk and talk. She would always dismiss Twilight, saying she was a lot older than she used to be, and Twilight turned to Luna a lot more, who was more than willing to help.

“Besides.” Celestia began. “I was too busy to go and help Twilight, And given how long you’ve been gone, I'd say the situation was handled, there was no reason for me to go. It’s done now.”

“TOO BUSY?!” Luna shouted, disgusted at what her older sister had just said,
“TOO BUSY! To help Twilight, too busy to prevent your student’s DEATH?! She’s come so far, and you believe that the Grand Galloping Gala is more important than helping your student?!”

Luna continued to shout, beginning to circle her sister again, who was slowly growing annoyed at Luna’s arguments.
She watched as Luna circled her. She now had her full attention.

“You’re a failure.. As a ruler, as a teacher, as a protector. You’d rather focus on an annual event, than the one student who has proven her worth to you, time and time again. You have your priorities back–”
Luna continued to argue, before Celestia cut her off.

“I AM NOT A FAILURE OF A RULER SISTER! AT LEAST I WASN'T GONE FOR 1000 YEARS! LEAVING THEIR SISTER ALONE TO DO EVERYTHING!”
Celestia yelled, immediately followed by Luna

“AND WHO’S FAULT WAS THAT? FOR NOT PAYING ATTENTION OR GIVING SOMEONE THE HELP THEY NEEDED!”
Both Princesses had resorted to using their royal voices at each other.

Their voices echoed throughout the halls, their voices shook the castle. Both alicorns horns lit up, and a fight had almost broken out, before the day and night guards of the princesses quickly rushed into the room, standing between Celestia and Luna, the night guards slowly backing Luna away.
Luna scowled at Celestia, before following her guards out of the room.
“Good luck planning the Gala, I won't be attending.”
Luna said coldly before leaving, slamming the door behind her.

As the weeks turned into months, the guilt of what she did weighed down on Luna, very heavily. And it was causing her to struggle with her duties of protecting ponies from nightmares.
She did the best she could, but she continued to struggle, which meant some ponies were experiencing more nightmares than normal during the night.

Including Twilight and Pinkie Pie, who relieved Rarity’s death over and over again through their nightmares. Causing them to lose sleep, and Pinkie took the heaviest toll, as she was the one who held Rarity as she died…….

“And now you’re telling me, that Twilight and Pinkie Pie are behind all of this?”
Luna asked the Cutie Mark Crusaders, as they explained what they saw in Twilight’s castle.

“They got mah sister, as well as Flim and Flam!” Applebloom explained quickly.

“And we saw Rainbow Dash die in her cell!” Sweetie Bell also explained. “She was covered in weird spots! And they all burst all at once! Thats what killed her!”

“But whatever it was, Twilight and Pinkie Pie made it happen!” Scootaloo explained in a hurried manner, her wings flapping frantically.

“I believe Twilight and Pinkie Pie are making diseases or infections or viruses, and trying to cure them before it kills the one they infected.” Spike theorised. Looking up at Luna with concern.
“But going off of what these 3 told me, they haven't succeeded, and lost Fluttershy and Rainbow Dash in the process.”

After Luna had all the information she needed, Applebloom showed Luna the evidence board Applejack had made in her bedroom before Pinkie Pie hunted her down. It had all the photos, the cover stories, and connecting strings on it still.
“Alright…. If what you’re saying is true, this can lead to serious consequences… I’ll go and pay Twilight Sparkle a visit…”