That line kept on repeating in your head.

"You'll never perform a sonic rainboom."

Over and over it repeated, mocking your failures. Whatever it was that was speaking to you, it knew what you had been doing. It knew that you had attempted a sonic rainboom, and it knew that you had failed.

Whatever it was, all it wanted to do was anger you. It seemed to enjoy irritating you, as it continued mocking you with that single line throughout the entire night.

Maybe it was that 'entity' that had appeared in your room that night. Although, the voice was unrecognisable. Then again, it did take the form of Twilight and Rainbow Dash, and that included their voices.

You had never heard the creatures real voice. Not once throughout that night had it pertained a true form.

After what felt like an eternity of being trapped with nothing but a looping taunt, morning arrived.

"Gah!" you screamed, shooting up in your bed. The morning sun shone in through your window, brighter than you had ever seen it before.

It must've been really early, as the sunlight was almost directly level with your window, as if it had only just begun to rise.

You looked around your room, trying to get your bearings. On Earth, whenever you had a nightmare, you would completely forget where you were, and it would take a while to remember.

You were in your room, in the Golden Oaks Library. Exactly where you had been for the past month.

Other than your bearings, the only thing on your mind right now was the sonic rainboom.

You had failed it twice before, and because of that you gave whatever monster your mind was creating a reason to taunt you, mocking you to the point where you couldn't get a good night's sleep.

If anything, Twilight had gotten a better sleep than you, and she was up all night writing Daring Do fan fiction for Rainbow Dash.

The most logical explanation was that your dreams fed on your fears, and your fears involved failure.

Failing to perform a sonic rainboom.

Failing to impress Rainbow Dash.

You didn't want to admit that these dreams you were continuing to have were the work of something more. Something more complicated than just your mind playing tricks.

But you weren't going to admit something that had no proof.

All that you wanted to do right now was succeed. Succeed at the thing that so far only one single pony had achieved.

You shouldn't be beating yourself up if you can't do it, but you were anyway. It wasn't like you were doing it willingly, though.

And with that, you had found your plan for today.

Become the second pony ever to perform a sonic rainboom.

It wasn't going to be easy, you knew that for a fact. But if it had a chance of stopping that taunting dream from returning, you would give it all you had.

How hard could it really be, right? Rainbow Dash accidentally caused a sonic rainboom as a filly, so if you were trying your hardest, you could surely achieve it too.

Speaking of Rainbow Dash, that was exactly who you needed for this to work.

You didn't need her to perform a sonic rainboom, so to say, but if anything went wrong, like it did last time, you needed someone to be there for you.

Now more determined than ever before, you leapt out of your bed and stormed out of the door.

You rushed down the corridor, and moved even faster down the stairs, completely unaware of any sound that you may have been making.

It was that early that even Twilight and Spike weren't awake. It was relieving to see that the two of them had gone to bed, though.

Already, you were out of the door and out in the fresh morning air of Ponyville. You had never been outside this early before, and as a result had never seen Ponyville this quite.

There were a few ponies here and there, but most were probably still inside, either still asleep or preparing for the day ahead.

You didn't want to waste any time, and were already flying quickly through the air. Flying somehow rarely got tiring, not even with the amount you did it.

As fast as you could, you flew all the way over to Rainbow's floating cloud house, which seemed just as quite as the rest of Ponyville.
The only sound you could hear was the sound of birds chirping. Not even the wind was audible.

You were considering knocking on her front door, but you weren't even sure whether she would be awake. It was very early, after all.

Before you could make up your mind however, you slammed face first into one of the cloud walls of Rainbow's house.

Despite it's cushiony surface, it still made a loud enough sound to instantly awaken Rainbow Dash from her slumber. You weren't even sure if she was sleeping, but you could assume that she was.
You couldn't exactly imagine a time when Rainbow would be up before Twilight.

"Gah!" Rainbow screamed, shooting up in her bed. She didn't know what the cause of the loud thump on her wall was, but she wanted to find out as quickly as possible.

She walked over to one of the upstairs windows and looked down at the cloudy surface below her. All that she could see was you laying on the ground after bouncing of the soft wall.

"Storm? What're you doing here so early?" she asked, staring down at you with her eyes still half closed.

You got up and regained your balance, already recovered from your collision with the wall.

"I'm here to find you!" you exclaimed, not wanting to tell her what you had planned.

"Yeah, but-" she interrupted herself with a yawn, stretching her hoofs out above her, "It's sooo early!"

You knew it was early, you didn't really need to be reminded. If you didn't get up so early then you would've had to wait until after work to attempt the sonic rainboom, and by that point, you might have lost confidence.

"I know, but I've gotta do this now." you said, trying to maintain the confidence that you had mustered.

"What are you talking about?" she asked, now looking at you with a speculative expression.

You gave her a somewhat determined grin, which was followed by her flying out of her window and lowering down to you, landing softly besides you.

"You'll see." was all you said as you turned to fly away, assuming that she would follow you. To your surprise, when you turned around, she wasn't moving.

"I haven't even fed Tank yet." she said, still yet to fully wake up.

"Oh! Right! Well, you go do that and I'll just wait here." you said, nervously rubbing your head. You were in that much of a hurry that you forgot that she had a pet that she needed to feed.

Rainbow turned around and re-entered her house. Thankfully, you had a feeling she wasn't going to take to long, as she wasn't the type of pony to brush her mane every morning.

Just as you suspected, she reappeared outside in under 10 minutes. She looked a lot more awake than she had prior, and now had a warm smile on her face.

"So, what's so urgent that you had to wake me up this early?" Rainbow asked, flying up next to you with a smirk.

You weren't sure whether you should tell her yet or not, but ultimately decided that it would be a better idea if you didn't. You didn't want her to get her hopes up for nothing.

"Oh, nothing much. Just some flying." you lied, trying to make some distance form the cloud house. Rainbow followed at the same pace, even though it was a lot slower than the speed you normally flied.

"That's it? You woke me up this early just for some flying?" she said, seeming a little annoyed.

"Just wait, ok?" you said, with a reassuring smile.

Maybe it wasn't a good idea getting Rainbow to come with you. You weren't even sure you were gonna be able to do it, and if you failed, Rainbow was for sure going to be mad at you for waking her.

"Ok, but it better be good! If there's one thing other than my friends that I like more than winning, it's sleeping!" she exclaimed, still following, but now seeming a little more excited.

She quite clearly didn't want to admit that she was feeling excited, but you could tell that she was. Her eyes seemed to light up more than they had been back at her house, and her flying seemed more sporadic.

The two of you reached a spot that had a few clouds that she could spectate from, and it made the perfect area. While you could have just moved some clouds, you didn't want to be too close to Rainbow's house in the event that it failed. The last thing you wanted was to be crashing into the side of her house twice in one day.

"Ok, wait here!" you said, your own excitement growing. Or, at least you thought it was excitement. In reality, it was probably just your own nerves toying with you.

Rainbow didn't say anything, and instead lay back on a cloud waiting for whatever you were about to do.

Now you could feel your own nerves beginning to build up. You knew not to let them get the better of you though. With Rainbow Dash watching, you begun flying as fast as you could into the sky. Already, you could feel the forces of gravity fighting your wings, attempting to push you back down towards the ground.

Rainbow sat up on the cloud, realising what you were doing.

"Wait. Storm, you're not-"

She didn't finish. She was hopeful that you could do it, but a feeling deep within her knew that you couldn't. And that feeling annoyed her.
You had woken both her and Tank up for no good reason other than to watch you fail.

She watched with both worry and annoyance as you stopped at a high altitude. Your wings carried you around, and you began soaring down towards the earth, gravity now choosing to work with you rather than against you.

Just like last time, the familiar vapour cone began to form around you. It was a little off putting, but you tried your best to ignore it.

To your horror, the pressure of the cone once again was becoming too much for you, and your speed began to decrease.

Rainbow couldn't take it anymore. She knew that you couldn't pull of a sonic rainboom, and she knew that you knew that too.

"Stop!" she shouted. And you listened.

If you didn't stop, you would've been shot off to who knows where. The vapour cone vanished, and all the built up pressure deteriorated with it.

"What were you thinking?" Rainbow said, angrily, as she flew up to you in a flash.

You were feeling a little bad about it now. Had you just broken your promise to Twilight? You had promised to never put yourself in harms way, but...

Didn't you just do that?

You looked around, not yet wanting to respond to Rainbow Dash. Right now, the thought of Pinkie Pie suddenly appearing in the clouds was the single scariest thought you could possibly think of.

Much to your surprise, she didn't show up. Maybe you had only broken the promise once you actually hurt yourself? You weren't sure though.

Maybe you had broken the promise, but she was an earth pony after all. She wouldn't be able to get up in the clouds.

"I thought I could... You know..." you said weakly. You didn't feel like you could tell her about the taunting voice in your dreams. You hadn't even told Twilight about it.

If it truly was the same thing that appeared in your room that night, you didn't want to worry anypony else with it. It was a monster made by your mind, therefore it was a problem you should deal with.

"No, Storm! Why would you even try to do a sonic rainboom again after what happened last time?" she retorted, angrier than you had ever seen her before.

She really did get snappy when she was woken up.

"I wanted to impress you!" you said, not entirely lying. You thought that finally pulling off a sonic rainboom would impress Rainbow, but you also thought it could defeat the mocking voice, or at least silence it for a while.
It seemed to thrive off of failure.

Back near when you had first arrived, it took your own voice and used it against you. After Rainbow had made you jump from the cliff, you had clawed into her with your anger.
That dream voice took your words and used them against you.

In a way, what was happening here was the same, only the roles were reversed. Now Rainbow was the one who was mad at you for putting yourself in harms way.

Now all you had done was give even more reason for your subconscious to torment you.

"Impress me? By abruptly waking me up and then doing that?" she said, angrily. You didn't respond, and instead hovered, still in silence, "You know what? Come find me when you're not trying to kill yourself."

As soon as she finished that sentence, Rainbow turned around and began slowly flying back towards her home, which was still in view. Almost immediately, a wave of guilt washed over her.
Maybe she was being too harsh?

Feelings of both guilt and anger built up inside you. Not only had you essentially broken your promise to Twilight, you had also angered Rainbow Dash in the process.
And she was right. You knew that you weren't gonna be able to do it. But you knew that you had to try.

With your emotions now overrun with guilt and anger, all you wanted to do was fly up to her and apologise for putting yourself in danger. But with your judgement being clouded, you made what seemed like a terrible choice.

You were going to try it again.

You had already broken your promise to never put yourself in danger, and you had already angered Rainbow Dash. What did you have to lose from trying it again?

With nothing else to focus on, you flew up into the air as fast as you possibly could, pushing your wings further than you ever had done before. If there was a time where you were going to succeed, this would be it.

After gaining a lot of speed, you turned around and began flying back down, as per usual. Already, the vapour cone had begun to form around you.
Usually it took quite a while longer for it to form, but you were going a lot faster than normal.

The pressure of the cone was once again pushing at you, but you pressed on. If it launched you, so be it.

To your surprise, you maintained your flight. The vapour cone shifted into the shape of a drill, but you didn't want to get your hopes up.

Using the guilt and anger you were feeling, the pressure of the cone began to dissolve and give way. You were this close to finally doing it.

And then... It finally happened.

Boom!

The vapour cone shattered, and all that built up pressure exploded into the air. A bright white shockwave coursed through the air like a wave.
It wasn't followed by a rainbow, though.

Instead of the bright prismatic colours of a rainbow spreading across the sky, there was a bright yellow wave. It rippled through the sky, multiple mini yellow shockwaves following it.

Tiny yellow lightning bolts occasionally shot out from the spreading wave, giving it an electrical appearance. It took you a while to notice, but it was the same exact shade of yellow as your mane.

Hearing the unmissable boom, Rainbow turned around to see the source of the sound. Her jaw dropped with disbelief as she watched the yellow wave spread across the sky, before she took off in your direction.

All you wanted to do now was rest on a cloud. And that was exactly what you did. Finding the nearest cloud, you lay down on it and panted.
You had actually done it. You had actually done a sonic rainboom.

"Storm!" Rainbow called, flying quickly up to the cloud you lay on, "You did it!"

You were a little surprised that she wasn't mad at you anymore, but you didn't see any reason to hold it against her.

"I-I did?" you muttered, still not able to believe it yourself. From the looks of things, Rainbow couldn't quite believe it either.

"Heck yeah, you did! That makes you the second pony ever to do a sonic rainboom!" she said, excitedly. You weren't really expecting her to be happy about another pony being able to do her signature move, but maybe she was happy to have some competition.
It was her who first got you to attempt it, after all.

"It wasn't as... rainbow as I expected." you said, looking up to the now disappearing shockwave. You were a little upset that the moment was being lost already, but it was amazing while it lasted.

Rainbow Dash also looked up to the almost completely vanished wave, seeming to be in awe of its electrical appearance.

"Yeah, we might have to change the name for you..." she said, only partly joking, "How about a sonic yellowboom?"

She seemed to think that 'sonic yellowboom' was an amazing name, but you weren't too sure. It didn't really roll of the tongue so well.

"How about... Sonic surge?" you asked after thinking for a few seconds.

At first, Rainbow didn't respond. You were a little worried that you had hurt her feelings by refusing the name she had suggested, but you didn't think her feelings would be hurt by something so minor.
Thankfully, you were wrong.

"That. Sounds. Awesome!" she exclaimed, flying forwards with excitement, "Can you do it again? Please?"

As much as you wanted to see it again, you really didn't think you had the energy. Not to mention, you still had work to go to today.

Wait...

"I've gotta go to work!" you shouted with sudden realisation. You had gotten so caught up with your sonic rainboom attempts that you completely forgot that you had to go to work today.

Instantly, you shot up off of the cloud and into the air.

"Wait! Can I come with you?" Rainbow asked, seemingly out of nowhere. You didn't have the time to question it though, you were late as it is.

"Sure, but we've gotta go now!" you replied, urgently. Applejack would probably kill you if you were late. You had missed the entirety of last week a second it is due to your illness.

"Well getting there won't be a problem seeing how fast you can fly, now!" Rainbow joked with a smile, getting a slight snicker out of you.

You didn't have any more time to waste, though. Instantly, you bolted off towards Sweet Apple Acres, Rainbow following behind you.

Author's Notes:

Storm finally did a sonic rainboom. In his case, though, I renamed it to something more fitting. Since the shockwave isn't rainbow coloured, 'rainboom' doesn't seem like it fits, so I thought of something more... electrifying.

As a side note, this chapter took longer due to the FIMfiction servers going yesterday. Thank you to all the FIMfiction staff for getting this amazing website up and running again, as I know hardware issues are a pain to deal with (especially considering the current state of the world).

Anyways, I hope you enjoyed this chapter