It's been a long time since the last time she saw her, but the memories never left her mind. She was "this" close to achieve her most glorious plan, unfortunately that pony wasn't in her plan and because of that she lost her host, which wasn't too bad. Now she could go wherever she pleased.
Still, she had other ideas in mind, like getting revenge on a certain pony, who was now a princess. Her inicial plan was to use her as a host, but that wasn't enough. She wanted that pony to suffer, but how she wondered. After her coronation, the dark mare started watching closely, thinking about several ways to punish her.
Months and months of watching was getting boring, no weak points or issues, until now.
Nightmare Moon finally found the most easy of the weaknesses. Love. Apparently, Twilight didn't have a special somepony, but she discovered the purple alicorn had a peculiar interest in mares.
Just the way she looked at her friend, a blue pegasus, could say a lot.
With this in mind, she prepared herself. Oh, she would definitely enjoy this!
Luna's moon hovered high in the night sky. The streets of Ponyville were empty, only for one pony wandering towards the crystal castle.
That pony had a grin on her muzzle. This night she would get her revenge.
Nightmare powered her horn, teleporting herself inside the castle. Like she expected, everypony was asleep.
Slowly, she trotted towards the stairs. While Twilight was out with her friends, she decided to "inspect" her castle.
The dark mare had to admit the castle was amazing. After all, who doesn't want a castle made out of crystal?
The light provided by the moon helped Nightmare reach her destination. Twilight's bedroom. In her way there, she checked her little pet dragon was sleeping, it turns out he sleeps like a giant boulder while mumbling something about Rarity.
Carefully, Nightmare opened the door. Peeking her head through the small crack, she could the bed sheets raising and lowering, along with a purple mane sticking out of the sheets. The mare smiled.
Using her magic, she removed the bed sheets. Twilight shuddered due to the sudden change of temperature. Blindly she tried to reach for the sheets, once she didn't manage to find, she slowly opened her eyes. The purple alicorn looked around, but she noticed something felt strange.
She swore the darkness was almost moving on its own. She rubbed her eyes.
"Twilight Sparkle."- a voice whispered from somewhere. The princess tried to check where that voice was coming from, but the lack of light didn't help much.
"Who's there?"- she asked towards the darkness.
What came next was a laugh, not a happy. It sent cold shivers through Twilight, it wasn't from being cold. She knew that laugh.
"N-Nightmare Moon?"
Almost seeming to answer her question, two cat-like eyes appeared and soon the rest of her body.
Twilight was shocked. How was that even possible? She saw with her eyes Nightmare Moon turning back in to Princess Luna.
She powered her horn, but Nightmare was faster, using her magic she grabbed the poor alicorn and pinned her against a wall.
"That's no way to treat guests, my little princess." That last word filled of poison.
In the other side, Twilight tried to struggle against her magic, but the dark mare had a good grip on her.
"How? We thought you were gone!"
Again she laughed.
"Oh, that's a looong story, believe me." She gave a sly smile. "What really matters now, it's you!"
Twilight gulped. She knew she needed to do something, if it wasn't for the fact Nightmare was blocking her magic and movements.
"W-What do you want from me?"
Nightmare approached her, their muzzles almost touching.
"Revenge my dear!" That was barely a whisper, but she heard that well.
"What do y-hmm..." Twilight was cut when she felt something touching her lips. That "something" was Nightmare and "touching" was kissing.
She shot a glare at Nightmare, who had her eyes closed. Without Twilight knowing, she lifted her front hooves and placed them on Twilight's cutie mark, giving them a nice rub.
Suddenly, Twilight let out a moan. Nightmare heard that, gave herself a mental smile, while doing her ministrations.
The alicorn tried to fight it, but her mind was starting to get blank. Unconsciously, she opened her mouth, letting Nightmare's tongue inside.
At this time, Twilight didn't offer much resistance, which was making more easier for Nightmare to control the situation.
After a couple a minutes, they broke the kiss, due to the lack of air in their lungs, a string of saliva between their muzzles.
Nightmare opened her eyes, glancing at her. Twilight apparently was panting.
Still using her magic, she placed the alicorn on the bed.
In Nightmare's mind, Twilight looked so cute while panting.
"Tell me Twilight, is this your first time?"
The mare in question looked away from her gaze.
"Y-yes..."
Like she predicted. Nightmare smiled, then she leaned on top on Twilight, her muzzle was inches from her ear.
"In that case, you're going to enjoy this." The tone in her voice was different, it sounded...sexy.
Twilight opened her mouth to protest, but again she was cut when she felt something rubbing near her marehood.
The dark mare continued smiling, one thing she was right, Twilight was starting to enjoy her ministrations. Her marehood was already leaking juices.
In a matter of seconds, Twilight was moaning and panting while releasing sweat and her another fluids that Nightmare knew very well.
For Nightmare's, she was starting to feel the heat between her legs demanding for some help, to release.
While she kept rubbing Twilight's clit with her right hoof, her left hoof descended, reaching her own sex. Nightmare moaned due to the sudden touch.
The room was filled with moans from both mares, enjoying their sweet moment. They minds went blank, only filled with pure ecstasy.
Under Nightmare's, there was a small pool of her dripping juices. Somehow, she was actually enjoying this. She wanted revenge, but her mind was telling her to enjoy this. She couldn't deny, she was enjoying every second.
On Twilight's bed, her sheets were stained also with her juices. Nightmare lowered her muzzle, hanging in front of her clit. She glanced towards Twilight's face, almost waiting for her permission. Twilight weakly nodded.
Her tongue touched her lower lips, sending bolts of pleasure through her whole body. She moan louder.
She really needed that, that touch. At this moment she couldn't think, only for one thing. Enjoy herself.
Nightmare continued licking her marehood, savoring the sweet juices.
"Hmmn, not bad."
Slowly, her tongue parted her lips. Twilight was now panting harder, she could feel her tongue sliding inside. The feeling of being filled was overwhelming. Oh, she waited so long for this, but she was so afraid to admit.
Her tongue slipped in and out, in rhythmic motion. As Nightmare continued, Twilight felt her pleasure increasing, she was getting close, her supposed punisher noticed that, her tongue slipped even further, hitting her precious spot.
That send Twilight over the edge, she arched her back upwards. Nightmare was also pretty close.
"Nightmare...I-I..."- she whimpered between moans.
"Me...too..."- she said, still continuing rubbing her marehood, her speed also increased, bringing herself closer and closer.
Seconds later, Twilight and Nightmare screamed. Finally, both mares reached their limits.
Fortunately for Twilight, Spike's room was far from her bedroom, not to mention again, he was a heavy sleeper.
Twilight and Nightmare were lying on her bed, in each other's embrace.
"That was a different kind of revenge." Twilight giggled.
"You can say that, but I guess you enjoyed it?" Instead of giving Nightmare a reply, the purple alicorn hugged more with the remaining strength she had left. "We still have a few hours of sleep left, we should really rest now."
Twilight lifted her head, meeting Nightmare's draconic eyes.
"Does this makes us...marefriends?
She smiled, kissing her lips.
"Only if you want."
After a small passionate kiss, they decided it was time to sleep.
Twilight woke up, that was probably her best night. She slept like a little filly.
The princess turned around, hoping to meet her marefriend, but found nothing. Her smile faded, until she noticed something resting on the pillow.
A letter.
The alicorn used her magic and grabbed the letter, she opened it.
Dear Twilight
I'm sorry if you don't find me in the morning, but don't worry. After all, nightmares tend to came back.
I shall return soon.
Your marefriend
Nightmare Moon
Author's Note
I'm sorry for the waiting, but yeah here's a new story.
My first clopfic, so tell me your thoughts. I hope you enjoyed 
