2 weeks passed after the events of the Grand Galloping Gala. You were walking around the town seeing ponies giving you more friendly looks. Since you stopped Blueblood they started opening up to you a whole lot more. You admitted that you thought you ruined their night but it was the exact opposite. But while you were walking around somebody was watching you. After an hour of walking you got hit with a magic beam and screamed, you fell down and turned around seeing 2 guards in yellow armor.

"What the hell was that for?!" Demon said.

"Silence! You are under arrest for destruction of Canterlot property and hurting one of our subjects." One guard said.

"That wasn't my fault! Also we fixed all the damage at the Gala!" Demon said but the guards refused to listen and placed him in cuffs.

"You're going to jail criminal! Now march!" The other said.

"Hey!! What is going on out here?!" Twilight said coming to them.

"Twilight Sparkle. We caught this criminal snooping around. So were taking him where he belongs: Tartarus." The guard said.

"He's not a criminal!! He just needed time to control the power he has! Now let him go!" Rainbow said.

"What's your proof that he isn't a criminal?" The second guard said.

"I stopped Chrysalis at the wedding a few weeks ago!! If I didn't then she would have been continuing to feed off the love and hurt innocent people! Is that enough proof for you?!" Demon said.

"Likely story." The guard said.

"Hey!! We were all there when that happened!! Now let him go now! Or i'll bash your skulls open!!" Rainbow said.

The guards saw Rainbow with anger in her eyes and they looked a little scared on the inside but didn’t show.

"Okay fine! But were keeping an eye on him." The guard said releasing you.

“And for your information you do not threaten us by saying such things. So you will watch him and if we catch him doing evil he’s going to be in jail.” The other guard said.

The guards walked away. You were pissed that they wouldn't believe you. So you conjured some red lightning and zapped them. They both screamed in agony and you raised both your hands and sent them flying to the unknown while they were screaming their heads off. Twilight gave you an annoyed look.

"Was that really necessary?" Twilight said.

"Umm they were gonna put me in jail for the wrong reasons. So yeah it was necessary. Plus I didn't kill Blueblood. He just got some burn marks that's it. But I really hate people like those assholes!!!" Demon said.

"Hey, hey buddy. Calm down. Relax. It's ok. Deep breath." Rainbow said calming you down.

"Im calm. Thanks Rainbow." Demon said.

"Ok hon. We said you can hurt bad ponies. Not attack Celestia's guards." Applejack said.

"Sorry. I was pissed cause those fuckers didn't believe a single word I said." Demon said.

"And darling can you please stop using that dirty language?" Rarity said.

"Umm girls? Maybe we shouldn't keep pushing him like that. I don't want him getting angry again." Fluttershy said.

"Yeah we don't want him losing his mind again. We have to keep him under control." Rainbow said.

"Rainbow. Im surprised you weren't judging him the whole time. That's really a first time you did that." Twilight said.

Suddenly Spike came to the girls with a note for them.

"Girls! It's a note! It's from Princess Celestia! She wants to meet the Demon King!" Spike said.

"Oh brother. I really hope she isn't still bothered by me possessing her body." Demon said.

"Don't worry. She's my mentor. She's the nicest pony I've ever known." Twilight said leading the group to Canterlot Castle.

<>

Once everyone arrived they entered the castle. Of course Demon had been here since he fought Chrysalis. But he didn't see those color stained windows. They represent legends of Equestria from long ago. He liked with there was to offer. Soon everyone got to the throne room and saw Celestia. She stood tall at our heroes with a smile.

"Twilight Sparkle. Im glad you and the girls are here." Celestia said.

"We all are princess." Twilight said as Celestia noticed you.

"And im guessing you are the Demon King?" Celestia said.

"Yes. Your Highness im sorry about possessing your body. It was one of my abilities as the Demon King and I feel bad. I tried controlling the Demon King to fight for good." Demon said.

"Don't worry. Your good. I actually brought you here because im curious to know what abilities you have as the Demon King. No one has ever possess such raw power like this before." Celestia said.

"Oh that. Well since you are the princess I guess I could show you." Demon said.

"But before we do I need you to answer this. Did you really shock 2 of my guards and sent them flying?" Celestia said.

"Okay yes that was me. Sorry about that. I snapped cause those idiots didn't believe a single word I was saying about stopping Chrysalis." Demon said.

"Ugh. Those 2 still haven't learned not to judge others. I really need to smack some sense into those thick skulls of theirs." Celestia said.

"Yeah. You probably should." Demon said.

"Anyways. Take the form of the Demon King and we can get started." Celestia said.

You let the symbol glowed and you transformed into the Demon King. But while the transformation was going you couldn't help but yell in pain a little. But it was complete and the pain stopped.

"I take it the transformation was a bit painful? Cause the symbol on your chest glowed?" Celestia said.

"Yes Celestia. This was not the first time that's happened." The Demon King said.

"Clearly. Ok now let us begin." Celestia said as her horn glowed. She shot some magic beams at you but you were unfazed by that. Then another blast you grabbed it and turned into a ball of red lightning. Celestia stopped as she was surprised.

"Incredible. You seem to be immune to magic blasts. And you can grab the magic turning it into your own magic and using it against your opponent." Celestia said.

"Yeah. When I fought Chrysalis her magic didn't seem to faze me." The Demon King said.

"I can tell. Now let us see what other abilities you have." Celestia said.

You demonstrated by conjuring red lightning from your hands. You then zapped Celestia but not too bad. After 5 minutes you stopped.

"So that's the lightning. Deadly but useful. Please continue." Celestia said.

You summoned a demon head and it shot some dark magic at her but she dodged. Then you took a deep breath and spread red fire at her but she quickly summoned a shield before the flames could touch her. 3 minutes passed and you stopped.

"So you can summon demon heads and breathe fire. That's not bad." Celestia said.

"Thank you. Now lemme show you a more scary ability I use." The Demon King said as she flashed his eyes and turned the room into the nightmare realm.

Celestia looked around seeing the place was demonic and evil looking. She then saw the giant Demon King coming towards her and stopped.

"Well this is quite the ability. Making the location your at into a nightmare realm." Celestia said.

"Yes. One of my greatest tricks I ever used." The Demon King said as he turned the room back to normal.

"So far all the abilities you have are quite useful. I can see why you defeated Chrysalis so easily." Celestia said.

"Yes they are. But I couldn't have done it myself. Even a Demon King knows when to call in his army." The Demon King said as he summoned a portal bringing out his demon minions.

"Oh. So you also can summon actual demons when you need to. Clever." Celestia said.

"Yes. And we'll bring down any asshole that gets in our way!!" One demon said.

"Now, now demons. I like where your heads are at. But let's save that for when we need to fight an evil being." The Demon King said as his minions returned to the underworld.

"Well I have to say. Those abilities you possess are possibly the most powerful ones I've seen in years. No one has ever been able to control such demonic powers in ages." Celestia said.

The symbol glowed returning you to normal. You looked at Celestia and answered her question.

"Well not many people can control demons. But maybe I was the only one that can." Demon said.

Suddenly the doors open and everyone saw Shining Armor and Luna running towards them. They both looked very scared and tired from running.

"Sister! We should have terrible news!" Luna said.

"What is it Luna? Is Ponyville under attack?" Celestia said.

"Well yes it is. But there's something else! Nightmare Moon has returned." Luna said.

Everyone gasped hearing that. Nightmare Moon was the most evil being that wanted to cover the land in eternal night forever. How she returned was bad news.

"Nightmare Moon's back?! I thought we stopped her months ago!" Twilight said.

"Umm. Who the hell is Nightmare Moon?" Demon said.

"Only the most evil being in all of Equestria. She was Luna's demonic ego. Years ago when they were first crowned the ponies liked Celestia a lot more than Luna. That left her jealous because they only slept on her night. Which made her turn into Nightmare Moon. We fought out to stop her and succeed. But I don't know how she returned!" Twilight said.

"I know how. After you defeated her some magic from the dark armor has been building up and once it had enough she gained her own form. Now she runs among us all." Luna said.

"And not only did she attack Ponyville but she kidnapped Cadence!!" Shining said.

"WHAT?!" Everyone said.

"Where did she take her?" Celestia said.

"To our old castle in the Everfree Forest. Twilight you must rescue her. Bring the Demon King with you. He'll need all the help he can get." Luna said.

"Don't worry princess. We'll stop Nightmare Moon and save Cadence!" Twilight said.

"Oh this is gonna be sweet! The Demon King vs The Dark Princess! Let's see how she can handle against me!!" Demon said.

"Come on gang! Let's save her!" Twilight said as she lead everyone out of the castle. Cadence was kidnapped by Nightmare Moon! Can the Demon King stop her? Only time will tell.

Author's Note

Oh no! Cadence is kidnapped! Tune in next time to see the Demon King fight against Nightmare Moon!!