((Prompt: An unlikely first meeting results in an unlikely attraction.))
“I'm so glad to finally get this chance to meet you, Fluttershy!” A purple and white tail swished in the doorway to the kitchen as Fluttershy found herself a cushion in the living room to sit down on. She found herself noticing that it was a very nice tail. Not in any lewd kind of way, just a passive recognition of where Twilight's shapely flank had come from.
A minute later the light grey unicorn mare to which the tail belonged emerged, levitating a tray of cookies. “I mean, I've caught glimpses of you and the others at Shining's wedding, and at the coronation, and my little Spark has told me a lot about you in her letters, but this is the first time we've had the time to do more than just smile and say 'hi.' Cookie?”
Fluttershy smiled gratefully at the mare and took the offered treat. “It's good to meet you too, Mrs... um.” She panicked briefly, trying to think if she ever remembered Twilight mentioning her mother's name. “Mrs. Twilight's mom,” she finally mumbled into the cookie.
The older mare laughed. She had a nice laugh, Fluttershy decided. “Velvet, sweetie. My name is Twilight Velvet. And yes, I realize it is very confusing to have two mares named Twilight in the same household.”
“Oh, it's not that confusing,” Fluttershy said. “At my cabin, there's a family of mice named Mr. Mouse, Mrs. Mouse, and Mouse Junior.”
“That's adorable!” Twilight Velvet set the cookie tray down on the end table and sat on the cushion next to Fluttershy. “Do they have big, medium, and little-sized holes in the wall to get to their den?”
Fluttershy grinned and nodded. “They do. It's very cute.” She took a bite of her cookie, and her eyes widened. “Mrs. Velvet, this is delicious! Is there mint in this?”
Velvet nodded. “From the flower pot in the window right over there. You like it?”
“Mhm!” Fluttershy took another bite and chewed thoughtfully. “I grow some at home, too. Did you get strange looks from all the earth ponies there when you went to buy the seeds, too?”
Velvet giggled. “I did! The shopkeeper even gave me instructions to 'give to my gardener!'”
They laughed together, and before long, there were only crumbs on the tray. Fluttershy looked around the house. “Where is everypony else?”
Velvet tilted her head. “Sparky is out with the other princesses.” A bit of pride welled in her voice. “And Shiny is on duty until seven.”
“What about Mr. Twilight?”
Velvet sighed. “He's at his home, probably. We're separated.”
Fluttershy's ears fell. “I'm sorry.”
“Don't be.” Velvet gave her a warm smile. “We left on good terms. It just wasn't meant to last.”
Fluttershy extended a wing to wrap around Velvet, who leaned into her. The older mare's cheek pressed gently against Fluttershy's shoulder, and she could feel a trace of body heat through her coat.
Velvet's voice became quieter. “It frightens me, sometimes, hearing about all the adventures you and my little Spark go on. I'm glad she has friends like you to keep her safe.”
Was that a blush Fluttershy felt in her cheeks? Modesty, no doubt. Fluttershy was a modest pony, who blushed when others complimented her, not one who found inexplicable feelings welling up in her when her hoof was stroked by an attractive mare who happened to also be her best friend's mother. “I-it frightens me, too,” Fluttershy stammered. “I'd like it if those adventures had fewer dragons in them.”
Velvet smiled, and ran a hoof along Fluttershy's wing. “That's how I know you'll take good care of her,” she said. “You won't let her take any unnecessary risks.” She nuzzled the base of the wing with her nose.
Fluttershy twitched at her touch. “M-Mrs. Velvet?”
“Fluttershy, can I tell you something?” A soft glow of Velvet's horn played with the tip of Fluttershy's mane.
There was a significant portion of Fluttershy's mind that wanted to panic, but the continued gentle pressure on her wing made it impossible for her to muster up a very good freak-out. Instead, she swallowed and nodded.
A grin spread across Velvet's lips. “I've wanted to meet you for a long time, Fluttershy. Ever since my daughter told me about you.”
Fluttershy's heart chose this time to do funny things with the inside of her ribcage. “V-Velvet...”
“Mother!” Both mares jumped as Twilight Sparkle stomped across the floor.
Velvet pushed a strand of mane out of her face. “Sparky, welcome home! I, uh, didn't hear you come in.”
“Mom, let Fluttershy go,” the younger Twilight growled. “This sort of thing is why I never had any friends in Canterlot!”