Thralls of Twilight by ManicQuil

https://desuarchive.org/mlp/thread/41006415/#41137667

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>>Twilight Sparkle walked into the throne room with butterflies in her stomach. She still couldn't believe it, she was the only princess ruling south of the Crystal Empire. Celestia and Luna were now officially retired.>>

>>There were still so many questions Twilight had for them. Was the capital of Equestria now Ponyville? Would she be forced to move back to Canterlot? What would the sisters do with their new freedom? While the questions threatened her sanity she luckily received a message to meet both ponies in Celestia's room.>>

>>With a centering breath, Twilight knocked on the door.>>

>>"Come in, Twilight." The voice of her mentor she pressed open the door and stepped to find Celestia alone when the letter mentioned that both ponies wished to see her. To make it odder, Celestia's changing screen was closer to her bed than normal. "Welcome, Twilight, we have much to discuss.".>>

>>Twilight couldn't help the words fumbling out of her mouth, Twilight swearing both the look in her mentor's eyes and the sound in her voice were meant to be flirting. "A-ah- I mean, I thought Luna would be here too." She finally managed to say. Celestia let out an amused chuckle.>>

>>"Oh, you are correct Twilight, but I wanted to clear up some things first, beginning with a little misconception I have needed to keep for so long." She said with that sultry smirk though the words had a bit of regret embedded with a rather titillating tone.>> 

>>"You see Twilight, while Luna and I refer to each other as 'sisters', We are not blood-related." She then took a more mischievous grin. "It's quite the opposite." Celestia's magic pulled the screen away revealing Luna, the Princess of The Moon missing her regalia.>>

>>Her hooves were now clad in purple socks and iron hoof cuffs, a steal collar hanging around her neck while her entire head was encased in a purple hood with an obsidian ring sitting on her horn.>>

>>"Isn't that right, my moon?" Luna moaned as her ears flicked back and forth, as Celestia's smile grew. It had been some time since she had broken Twilight's brain.>>