At the end of the hall, another familiar mare stepped into view. The sparse moonlight reflecting off her armor and massive scythe… it was Rainbow Dash, again with crimson eyes, her wings replaced by those of a great bat. Luna instinctively turned back into the open room. Pinkie was now in the open sarcophagus, talking to the dusty skeleton, even moving it’s jaw and providing a “voice” for it.

Rainbow Dash now stood in the doorway, barring the princess’ exit. The frantic princess looked up and saw a familiar shaped alicorn mare… she shook her head in disbelief as she saw that this mare, too, had bat-like wings and crimson eyes.

“Twilight! What is going on here!?” Luna demanded.

Twilight’s horn began to glow it’s signature pink, the soft light revealing the lacy corset that clung to her slender body. Suddenly Luna felt a tightness around her stomach and her hands being sharply tugged back. A glowing ring slid over her horn as she looked down to see glowing ropes binding her regal form. They wrapped tightly around her wrists. Struggle as the princess might, she was not strong enough to break free.

Twilight jumped down from the ledge onto the floor, landing on her leather-clad hooves. Rainbow Dash’s armor clanked lightly as she moved to grab Luna by the arms and hold the kicking, struggling mare in place.

“Don’t do this, Twilight! Whatever insane plot you have we ca-” Twilight shoved a red bandanna in Luna’s mouth and fastened it behind her head. The magical ropework held Luna’s leather jacket open, revealing the shirt underneath which showed off a bit of her belly.

Twilight stood, admiring her handiwork, gently biting down on her index finger as she grinned at the thrashing princess. Luna’s futile struggle did nothing more than show off her body to her captor. Had Twilight not lost the biological ability, she would have blushed.

“We beat you once when we were just regular ponies. What made you think you stood a chance now?” Rainbow Dash asked, effortlessly holding the princess.

“Bring her back to Fluttershy.” Twilight commanded. With a simple nod, Dash dragged the squirming, helpless Luna off into the darkness…

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I think I should’ve redesigned Vampire Twilight’s outfit. Thet hings over her breast are supposed to resemble bat wings, but they look more like spider legs.