Nightmare Moon stood in front of the two crystal doors with a smile on her muzzle. Hearts and Hooves Day. It was one of those days she hated it, but now she had a reason, or in this case a mare to celebrate with. She always though having feelings would make her weak.
After that faithful night with Twilight, her feelings clouded her mind. She wasn't so sure now.
She turned herself into a blue mist and entered the castle between the door frames.
Once more, the interior of the castle was silent with a few candle lights here and there. Fortunately for her, she remembered the way. How could she forget? Every moment of that night was still in her head, like if just happened yesterday. She couldn't denied it, it was the best moment in her life and she wanted more.
Nightmare went up the staircase, still with a smile. She wore her blue armour for no reason.
Quietly, she continued going down the hall until she found Spike's bedroom. The mare slowly opened the door, making sure he was really sleeping. Instead, the small dragon was reading a comic under the bed sheets with a light. She shook her head, smiling. Nightmare powered her horn, creating a simple spell and release it. Spike yawned before falling asleep.
She entered his bedroom, with her magic she placed the comic on the table and switched the light. When she finished doing that she turned her attention to him, pushing his bed sheets.
Nightmare trotted back to his door and glanced back at the young dragon, closing the door she continued towards her destination.
Her smile went ear to ear when she found it. A purple door with a star. She just hoped it wasn't too late in the night.
With some caution, Nightmare opened and took a sneak peek.
'She isn't sleeping?' Her bed was empty, it wasn't showing any signs of life.
She glanced around the room. The mare felt a slight breeze in the air, meaning a window was open. The balcony. Twilight had a balcony overlooking Ponyville. Maybe she was there? Nightmare trotted inside, noticing the balcony doors, she proceeded towards it.
Turning around the corner, her heart skipped a beat. There she was, under the beautiful light of the moon.
She approached the mare from behind and with a quick motion, she gave her a hug. Twilight giggled and returned the hug.
"You sure took your time." - she suddenly said, enjoying the overwhelming embrace.
Nightmare glanced at mare in her hooves. She had the most gentle of smiles she had ever seen before.
"You knew I was here?"
Twilight nodded.
"I placed a sensor spell on the door."
"Why?
The purple alicorn gave her an awkward smile.
"Ah, long story ehe."
"We have plenty of time to talk, after you know what."
"After what?" - Twilight asked, obviously teasing with a smirk.
Nightmare immediately kissed her in the lips. Both mares closed their eyes, feeling the warmth. Nightmare's hooves went to her haunches and giving a slight squeeze. Twilight moaned in the kiss. After a couple of seconds, their lips parted.
"I really missed that." - the purple alicorn spoke.
"Me too, we should go back inside."
Twilight and Nightmare trotted towards the bed. Without warning, Nightmare grabbed Twilight with her magic and threw her on the bed. A second later, she was on top of her, covering her with kisses and licks. Meanwhile, Twilight kept moaning softly.
She kept squeezing her flanks around the cutie mark.
"S-Stop teasing."
"As you wish my princess." Nightmare turned her body around so that her marehood was right above Twilight's snout. "Does this please you?"
Twilight smiled and wasted no time giving a long lick on her marehood, Nightmare moaned slighty, but she remembered to return the favor.
She lowered her head, pulling her tongue out, she gave her a long lick, savoring the sweet flavour.
Both mares moaned, their body heat inscreasing and inevitable pleasure building within.
The princess stopped her actions to breath, but Nightmare's ministrations was making it hard, it served for her to moan more.
Her legs started to quiver, the mare in black smiled to herself, this meant she was getting closer. Twilight was almost at her peak, she could feel the much awaited relief, then everything stopped. Nightmare got herself off Twilight with a big grin.
"Oh, you're a bad mare, you know that?"
Nightmare kissed her for a brief second.
"I know." - she smiled "and you love it." Twilight replied with a hug.
"The night is still young." Nightmare got off the bed and laid in front of Twilight's marehood. "Let's try something new."
Twilight arched an eyebrow, she was about to ask what, when she let out a scream of pleasure. Nightmare giggled.
Her horn was deep inside her marehood, she moved her head to go in and out. Twilight's marehood seemed to squeeze her horn.
The purple alicorn was struggling not to scream, afraid of waking Spike, but the new sensation was overwhelming, she never felt being filled like that. She was right, she love it.
"Y-You feel so good Twilight...scream all you want" - Nightmare stammered. "the young drake is s-sleeping, trust me."
"Aah, you too." The screams of pleasure from Twilight was driving Nightmare crazy. She began to increase in her thrusts, pushing her horn even deeper. Again, Twilight felt her pleasure raising, and she really, really needed this. "P-Please don't stop!"
Nightmare would replied, but she was too focus on pumping her horn in and out of Twilight.
"I-I'm...close...don't stop." With the remain of her strenght, she push her horn all the way in. Twilight couldn't hold anymore. "N-Nightmare!"
Her marehood was clenching around her horn while releasing her orgasm.
After a few seconds, her orgasm was done and now she was satisfied mare. Nightmare got on the bed and laid next to her.
"Did you enjoy?"
Twilight wrapped her hooves around her marefriend and buried her muzzle in her chest.
"You have no idea." - she hummed softly. The two of them shared a warm embrace, before she spoked again. "Don't leave, please."
"I won't, I promise." Nightmare smiled. "Happy Hearts and Hooves Day, my little Sparkle" - she finished with a giggle.
Twilight rolled her eyes and kissed her one last time.
"Happy Hearts and Hooves Day, my lovely Moon." In a matter of seconds, they fell asleep in each others embrace.
Author's Note
Happy (late) Heart and Hooves Day everyone 
I hope you enjoyed 
