Okay, time to end the dramatic suspense, and see that a good rectifier be put in place for this story. I hope it's not too short.
Celestia arrived shortly following Aversion's death. After being regretfully informed by Luna and Scolus of the tragedy, she made preparations to have him properly buried. Aversion's body was taken to the Canterlot morgue, and a casket was readied, with Luna giving her own expense to ensure he would have a very nice one.
Luna sat next to Aversion, in the casket, as she readied herself to seal him away... for good. The morticians, Celestia, and Scolus cleared the room, as she requested one final moment with him alone. She gazed upon the corpse of her lover, her eyes still rich with tears.
"Avey..." she whispered, "...my dear, kind Avey... never before have I had the feelings I had with you around... you taught me true, genuine love... you've made me go to great lengths for your sake, of my own accord... a-and..." she trailed off for a moment as she began crying again, "...you've... given my life real purpose... j-just as I... gave yours...! And now... it... it's all over...! S-so... goodnight, m-my sweet, little p-p-prince..." she sobbed, hugging Aversion's limp corpse, "...g-goodnight... f-f-for... ever...!"
With that, Luna broke down completely, sobbing relentlessly. Never did she want to let go of Aversion, even though he was no longer there. His body was all she had left. As she reluctantly lowered him back into the casket, she took a moment to collect herself after a good, long cry, and looked at him one final time.
A single tear rolled down her cheek, dripping off, and falling onto Aversion's barrel, right where his heart was. However, she paid no mind to this. She simply pulled the cloth over him, ready to close the casket, and seal him away.
"May you have... s-sweet dreams... for now on... u-until... the end... of t-t-time..." Luna said, tearfully.
Slowly, she closed the casket... and did not notice that a blue light appeared from inside, right where Aversion's barrel was, just at the last moment before it shut. Nevertheless, Luna was utterly despondent. This broke her heart on a level she did not even know was possible.
"King Sol... my father..." she spoke to the sky. "...please... humble a request from your daughter... and watch over... m-my poor Avey..."
Luna met back up with her sister and the grieving changeling in the room outside the morgue.
"Lulu..." Celestia spoke, "...I'm so sorry. Truly, I am. I know how much he meant to you, and it's truly heartbreaking for this to happen."
Luna sat where she was, not bothering to look up from the floor.
" 'Tia... I-I just have to wonder..." she spoke. "...is... is this my ultimate punishment...?"
"Punishment?" Celestia asked.
Luna sniffled. "...Th-the universe... finally offers me... a k-kind, caring lover... and then... it... t-t-takes him away... f-from me...! Is the universe... p-punishing me... for everything I d-d-did... as Nightmare Moon...?"
"That's not a good way to look at it," Celestia said. "This was most certainly not any sort of punishment, in spite of the tragedy it spelled."
"B-but... but my Avey is DEAD!" Luna cried. "H-he'll... never see me again...! He's been r-robbed of life... l-love... happiness... his h-h-heartwarming smile... and... h-his future...! He was still... s-so young...!"
Celestia took a seat next to her little sister, wrapping a wing around her, and pulling her close.
"Lulu... it's never good when an innocent pony has lost their life," Celestia said.
"But Avey didn't have to die!" Luna shouted.
"I know..." Celestia said, "...and like I said... I'm so sorry, Lulu."
Scolus had nothing to say at this point. All he could do was sit, trying to process this cruel twist of fate. Luna, in the thousands of years she lived, and through the many situations she had been in, finally concluded that literally nothing could hurt more than losing the stallion you love.
'I suppose you require more time alone?" Celestia asked.
Slowly, Luna nodded. Celestia stood and made her way to the door.
"Let us give Lulu some peace, Scolus..." Celestia said, quietly.
Scolus, like a zombie or a robot, stood in a static motion, and walked at a steady pace out of the room. Luna, in the meantime, sat where she was. There was absolutely no way she was ever going to recover from this. No way she would ever stop thinking about it. Her train of through was swayed slightly by a glint of light she saw. She looked up out of curiosity, and saw that something she was not expecting...
...The aura stone attuned to Aversion's life energy, which Luna happened to bring for sentimental value, had a noticeable glow. And it was getting brighter.
Luna's eyes widened, and her jaw hung agape. She hastily stood and trotted over to the stone, looking at it closely as it illuminated.
"Oh, my sister...!" She uttered.
The stone lit back up to its full brightness. Immediately, Luna broke into a gallop back into the morgue, and levitated the casket lid off. She then pulled up the cloth, getting a look at Aversion... and he was stirring. His eyelids flickered for a moment, before he opened them, and looked right at her.
"Lulu?" He said.
Luna gasped as a massive smile filled her face. "AVEY!"
She pulled the young stallion up into the tightest hug she ever gave.
"HNGH...!" Aversion strained. "...Can't... breathe...!"
Luna did not care. She was just so happy right in that moment.
"Oh, stars above!" She exclaimed. "I thought I lost you! How did you come back?"
Once she released him, and he caught his breath, Aversion slowly responded. "I... I don't know, really."
"Well, it doesn't matter!" Luna said, hugging him again, but more gentle. "You've come back, and that's all that matters!"
When she lowered him back down, Luna looked at Aversion's barrel, just as Aversion himself did. Both of them saw that his heart was glowing a light blue, inside his barrel.
"Whoa," Aversion said. "What is this?"
"It appears to be..." Luna trailed off, thinking, "...a very rare form of magic."
After a moment, the glow within Aversion's chest went out. He then pulled himself out of the cloth inside what would have been his coffin.
"Oh, it's truly a miracle!" Luna said, hugging Aversion yet again. "We must inform 'Tia and Scolus, posthaste!"
And they did inform Celestia and Scolus, both of whom where overjoyed to see him alive and breathing again. Scolus, especially, was ecstatic that his childhood friend was not gone too soon.
"You don't know how happy this makes me, buddy!" Scolus said, giving Aversion yet another tight hug.
"Agh..." Aversion strained, trying to pull himself free, "...at this rate... I'm gonna get cardiac tamponade, and die anyway."
"Oh, right," Scolus said, letting his friend go. "Sorry, dude."
Celestia smiled at the revived stallion. "It's truly a wonderful thing, that fate has decided to allow you to live, Aversion. We all believed for sure your time had come."
"Yes, indeed," Luna said. "I thought I would fall into yet another depression... one even worse than any I had before."
"And, like..." Scolus said, "...how did Av come back from the dead?"
"I believe I have the answer," Celestia said. "When Lulu was sobbing over Aversion's corpse, a single tear, containing the purest essence of her love, fell right onto him, where it magically made its way to his heart. From there, its sparked energy sufficient to revitalize him. It was the power from Luna's love that replenished the energy stolen from him by that malevolent, parasitic entity."
Luna's eye widened. "My tears... gave him life..."
Her lover, finally having the courage to initiate it himself, stood on his hind legs, and hugged the Princess of the Night around the neck.
"Thank you, Lulu," Aversion said. "You saved my life."
"Of course, Avey," Luna responded, wrapping one foreleg around him. "I would do anything and everything for you."
"And," Aversion spoke, "it's finally helped me put the final piece into place for a puzzle I've been struggling to comprehend for years, now."
Luna let go of him, making eye contact with a raised brow. "Oh? What's that?"
"My cutie mark... this blue flame on my flank... it's been one of the biggest enigmas in my life. For the longest time, I did not even know what it was... until now!" Aversion said.
Luna stood where she was, ready for his explanation.
Aversion continued: "When I devoted myself to make a legacy to leave here on Equestria... I felt a drive, and a need to go above and beyond where I was at! That's when my cutie mark appeared! As it turns out, when I am in the right mindset, I am able to bring myself to do things that get me that much closer to leaving a lasting legacy on this world... and when my life was ultimately confined by my financial situation, I lost sight of my inner fire!
"You get what I mean, Lulu? The blue flame... it's a symbol of determination and hope! Finding hope, even in the bleakest of situations, has always been my special talent! It's the reason I was able to keep pushing forward! Even in cases when I became suicidal... there was always something that showed me the light! My fire dims over time... but eventually reignites! And as it just so happens, I have been able to do the same for others. That being you, Lulu."
Luna smiled and blushed as her eyebrows pointed upward.
"Well," Scolus began, "since you died and came back, Av... who thinks this calls for a celebration? I think I'll ring up Pinkie Pie from Ponyville! She'd surely be more than willing to throw us a party!"
"Hmm-hmm," Celestia chuckled. "I believe after such a terrible series of events, it would be worthwhile to perk ourselves back up."
Without any further delay, the two sisters and two male friends left the morgue, leaving some very confused morticians to see an empty casket. They made their way to Canterlot Castle, in preparation for a celebration. Needless to say, they all had an excellent time with the party that Pinkie Pie threw. The rest of the Mane Six, as well as Spike and Starlight, attended as well. Aversion had quite the spotlight from all the attendees, what with him being the one pony they knew of who truly cheated death.
As the festivities went on, and he spent an ample amount of time with his Princess lover, Aversion could not help but chuckle as he recalled what his college dorm-mate, Scrub Oak, told him all those years ago.
"Well... it is just me and Luna. Together, forever," he said to himself. "And Tartarus has frozen over! Heheheh..."
A little while later, Celestia was in her room, getting herself cleaned up for dinner, when she heard a knock on her door.
"Come," she called.
Luna entered Celestia's room. When the latter looked at her younger sister, she noticed she seemed very... tense.
"Is something wrong, Lulu?" Celestia asked.
"Well... not really..." Luna began, "...um, 'Tia... y'know how the magic in my tear brought Avey back to life?"
"Yes, why?" Celestia asked.
Luna nervously shuffled her front hooves. "Well, it turns out... it was a lot more powerful than we originally thought."
"Oh?" Celestia said. "How so?"
Luna sighed, turning back to the door she just came in, motioning for somepony to come in. Some hoofsteps approached, and in walked Aversion. However... he had undergone quite a substantial change, from what it seemed. He was taller, and had wings and a horn. Celestia stared, dumbstruck, at the stallion who just walked in, who smiled weakly, his lip quivering, flustered.
"H-hi, Your Highness..." Aversion said.
"Lulu..." Celestia uttered, "...Aversion's... an alicorn?"
Well, one curveball after another, huh? Seems like things really are going to be better for just about everyone involved, though. At least the story is winding down on a happy note, right? Anyway, I'll be sure to close off this story soon, but school is really picking up, which is why I haven't had a great deal of time to work on this story. Regardless, thank you all for your patience, and I will catch you all real soon! Keep holding on...