Author's Notes:

By (un)popular demand...

One more bonus chapter coming because I'm enjoying this concept way more than I probably should be. It continues off of this one, so you'll probably be able to guess where that's headed.

Anyway, here's the No-Fun-Not-Ever ending.

"Kneel before your king, Celestia."

Dutifully, Celestia dropped to one knee at his feet, bowing her head to him.

She was his.

The door to he throne room banged open. Twilight Sparkle and her friends rushed in, leaving a trail of unconscious and otherwise subdued guards behind them.

"Sombra!" Twilight shouted. "Your new reign ends here!"

"Yeah!" Rainbow Dash said. "Time to give up the crown!"

Sombra sat upon Celestia's throne. He gazed down at them, amused.

"Here to fight the good fight with nothing but your wits?" he said. "Admirable... but foolish!"

"Even without the elements, we're more than a match for a coward like you!" Rarity cried.

"Yeah!" Rainbow Dash added, taking to the air with a flap of her wings. "When we're together, nothing can stop us! We don't need no stinking elements to take you down!"

"Surrender, Sombra!" Twilight said, her horn beginning to glow. "I don't know how you managed to come back, but I'll make sure you never escape again!"

Sombra chuckled. "My, isn't that sweet. You actually think you have a chance!"

In response, Twilight sent a burst of magic racing towards the throne. It was batted away in an instant, but she wasn't planning on letting up, another spell already charging in her horn. The fight would be tough, but with her friends at her side and Sombra all alone, there was no way she could lose. That was what she believed.

However...

"Fool!" Sombra snarled. "Do not dare to disobey me, slaves! You will kneel before your king!"

Suddenly, magic took hold of the ponies' limbs. Twilight attempted to discharge her spell, but found her magic cut off. How? She'd been watching Sombra, ready to counter any move he might make, but not only had this new magic overpowered her, she hadn't seen him cast at all! And the aura that now surrounded her was a golden yellow, not his deep red...

Her knees buckled as she was forced towards the floor by an immense force, the rest of her friends behind her crying out as they, too, were pushed to their knees.

Twilight forced her head up so she could look Sombra in the eye. He smirked down at her. His horn was unlit.

"Nngh, how?" she grunted out, as the pressure tried to keep her head down.

Sombra just smiled.

A figure stepped out from behind the throne. They wore a peculiar sort of armor, and everything from their feet to their neck was coated in a thick, shiny latex bodysuit. A helmet covered the top half of the mare's face; a glowing green visor sat over her eyes.

The figure stood stiffly at attention beside Sombra's throne. He ran his fingers through her long, rainbow hair.

"No," Twilight gasped. "It can't be!"

"Oh, but it is!" Sombra's horn began to glow, and the helmet lifted off of the knight's head.

The sight of Celestia's cold, emotionless face, the purple haze of black magic leaking from her eyes, was enough to shatter Twilight's spirit.

"P-Princess?" Twilight gasped. "Princess Celestia!"

If the former princess had heard her, she showed no signs of it.

"This has to be a trick!" Applejack said. "Another one of his illusions!"

"Oh, I'm afraid it's all very real," Sombra gloated. "Isn't that right, Knight-Commander Celestia?"

"Yes, my king," Celestia replied. "I hear and obey."

"No!" Twilight yelled. "Princess Celestia would never fall to you!"

"On the contrary; she was all too happy to kneel at my feet," Sombra said. "Who do you obey, Celestia?"

"You and only you, my king. I am yours to command. Your will is my will."

As she said the words, her body shuddered, and her thighs squeezed together for just a moment.

He turned his attention back to Twilight, still struggling to stand. "You see? She's given herself up to me, mind, body, and soul."

"Princess, please! You have to fight it!" Twilight begged. "You can't let him control you!"

"Don't you understand yet, Twilight Sparkle?" Sombra said, laughing in his triumph. "There's nothing left of your beloved princess to fight with! Your Celestia is no more!"

He turned to Celestia. "I have new orders for you, my knight."

"Yes, my king?"

"Force them to submit. Leave the princess."

"Yes, my king." Celestia's horn glowed bright.

Twilight flinched as her friends began groaning in pain. She whipped her head around, but all she could do was watch as Celestia's magic surrounded their skulls, forced its way into their minds.

"No!"

"Twilight... I'm... sorry..." Applejack managed to mutter out, before her eyes, and the eyes of all her friends, filled with a sickly green glow. Their struggles ceased as their minds were taken.

Tears fell down Twilight's face. "No..." she whispered.

Sombra grinned. "You five," he said. "Go join the other slaves in the courtyard for your assignments."

They obeyed without question, their movements stiff, mechanical. Twilight watched them go, leaving her all alone with the mad king and her former mentor.

The doors slammed shut.

Biting back the tears, Twilight turned to look at Sombra, still mocking her from Celestia's old throne. Despair turned to fury, her muzzle twisting into a grimace.

"What are you going to do to them!?" she demanded.

"Oh, I'm sure they'll be put to use somewhere," Sombra said, dismissing the question with a wave of his hoof. He grinned. "If I were you, princess, I'd be more worried about what I'm going to do to you."

"And what's that?" Twilight snarled.

"The same thing I did to your mentor, of course. You, Twilight Sparkle, will be joining Celestia in my elite guard."

His tail flickered, swirled. From the shadows emerged a set of armor, identical to that which now adorned Celestia. Twilight's eyes widened with fear at the sight, but then her gaze hardened once again.

"I'll never let you control me!" she spat, through clenched teeth. "Do whatever you want, I won't fall! Not to you!"

Sombra smiled.

"Maybe not to me," he said. "But what about to your mentor...?"

He turned towards his knight. "She's all yours."

Celestia nodded, saluted him, and stepped forward, her glowing green eyes meeting Twilight's own, widening ones. Her magic took hold of the armor.

"Thank you, my king. Hail Sombra."