I'm having a few concerns about this one.

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“Where am I? What did you do?” Princess Luna hovered in darkness, face to face with the creature that hours earlier tried his hardest to eat one of the royal guards. Granted, she approached him, under the assumption he was sleeping. Luna realized that was not her best moment.

“Calm down, Princess, I don't mean any harm.” He paused, his gaze shifting around the darkness surrounding them, the wolf keeping its eyes on her. “A bit dull, wouldn't you say? Guess that says something about me, doesn't it?” He laughed a little, that struck Luna as odd, she wasn't going to call him out on it, this was his mind after all. One did not offend an intelligent being in their own mind, that tends to have fatal results. She jumped when he brought his hands together, a clap, in an instant, the void changed.

It morphed into a rectangular room, made of stone, bronze decorations, statues and busts decorated the space. Odd pipes ran along the walls, one of cracked open, releasing steam, different valves and gears turned all around the two. An arachnid-like construct of some sort scurried between them, it hurried through a door on the far side of the room, behind Reman. The man had a smile on his face.

“Much better, wouldn't you agree?”

“Yes, well, it's certainly... unique.” Luna had an uncertain expression about, that nervous grin one gets when slightly afraid. “But better than never ending blackness.” Reman nodded.

“Like I said, calm down, I'm not going to hurt you, well, not intentionally, anyway.” Luna's eyes nearly doubled in size, but Reman's attitude was infectious, that was probably the only thing keeping the Princess from really panicking. It didn't last long, though. “So, this is going to sound bad, but I have no idea how to get us out of here.”

“What!?”

“Wait, that's not entirely true,” Reman held up his hands defensively. “I have some ideas, but, they're shots in the dark. There's no guarantee they'll work.”

“That's better than nothing, come on!” Luna was now in full panic mode. The pony was no longer scared of him, really just the situation she found herself in. The little Princess was starting to remind Reman of his little sister, putting the human danger aside to focus on the situation.

“You used Illusion magic to look in my head, I used Alteration to mess with you magicka flow. Mind's Eye is a concentration spell, your body is still casting it, even though your mind is here. That being said, either we wait for you to run out of magicka, or we interrupt it from in here.”

“Um, I understood everything but the words 'magicka', 'Illusion', and 'Alteration'.” Reman nearly slapped himself.

“Magicka is the energy our magic users utilize as a source of power to fuel their spells, I can go more in-depth later if you want.” Luna nodded, the Night Princess was always eager to learn more. Learning from an unknown type of creature only sweetened the prospect. “The other two are names of Schools, or disciplines, of magic. Again, I can explain more later.”

“I'm not running out of energy anytime soon, so how are we going to interrupt my body's casting?”

“Well, I'm going to need your full trust to do this, but do you remember earlier, when I was in, shall we say, 'different'?” Luna did not like were this was going, but nodded anyway. “If I transform, it should force your mind out, which should return it to your body, that should put me back in control of mine as well.”

“I can tell your not giving me everything here.” Perceptive, little pony, very nice.

“Actually, I was getting to that. You see, when I transform, I’m equally beast and man, still in control of myself, but on the razor's edge, I’ve lost control like that before.” Luna didn't like that.

“How is that a good idea?” Luna really didn't like the idea.

“It's not, but it's an idea. However, I can stay in control effortlessly if I have the right item touching me.” Please have it, little pony. Please have it.

“That item would be?” She took the bait, now to get the damned thing.

“You see, I have a silver ring,” Luna's eyes widened, she probably knew where it was. “When I wear it, I’m perfectly in control of myself, I'll let you weigh the options, I hate being out of control more than I being locked in here.” The Princess considered both sides for a few minutes, Reman resisted tapping his foot on the stone floor. A smile spread over Luna's features.

“I have it in my saddlebag.”

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A shrieking roar pierced the air.

Summer Glade was transforming. In her life, Princess Celestia had never seen something like this, the reverse, however, she'd attended with front row seats. The Pegasus' fur had changed from its bleached white, to a dark brown. The mare's muzzle elongated by about an inch, her flat teeth sharpening, mirroring the very ones the Reman had used to nearly cripple her with.

She howled again, rolling onto her stomach. Her muscles bulged, her injured wing freed itself from its binds, fully healed. Glade's hooves cracked, splitting into three portion, each of them sharpening into a wicked claw. She collapsed onto the hospital bed, panting.

Glade was facing the window, her dazed eyes looking into Celestia's own, her tongue stuck out of the side of her mouth. The transformed pony rose to her hooves, paws, claws, whatever they could be called now. Glade showed her teeth, growling, and launched herself at the window. The resulting bang was incredibly loud, but the reinforced glass didn't even shudder. Again and again Glade flew at the glass, even slicing at it with her clawed digits. The very moment she roared again, Celestia came to a realization.

She'd need the Imperial's help with this. The Princess of the Day seemed to have wonderful timing, as she heard pounding steps approaching from the hallway to her right. And just as she guessed, around the corner came Reman, fully shifted in his bestial form, being chased by the guards she had posted at his door.

However, upon further inspection, she noticed they weren't chasing him, they were running with him. Celestia had given up on being surprised by the Imperial, which was probably for the best. Unfortunately, no amount of preparation could help her with what she was about to see.

Luna was riding on his back.