Author's Note

Prequel chapter: Curiosity (Flutterpony)

Sources:
http://birding.about.com/od/birdbehavior/a/Preening.htm
http://atethirteen.deviantart.com/art/Bird-Anatomy-Wing-and-Feather-105539505
http://fav.me/d74ruz4

Inspiration:
[NSFW] hxxps://derpibooru.org/333527

by Flutterpony

Answers (Flutterpony)

"Alright," the foalsitter swallowed again. "That's fair," she reasoned. Fair and morally upright were two different things, of course, but the young princess had been past arguing chastity ever since she'd first crossed the line. It was only fear that made her hesitate now. With a hoof to her diaphragm, Cadence reminded herself to breathe in, then, extending her hoof, breathe out.

The little purple unicorn looked concerned. "Is it alright?" She cared whether Cadence seemed uncomfortable, even despite her intense curiosity. She wasn't an insensitive foal, really, but Cadence knew it wasn't every day the little filly would slow herself from getting the answers she craved merely for the sake of another pony's comfort which, come to think, probably explained why Shining had let on as much as he had about the special purpose of wing care. Twilight was a tough filly to satisfy when it came to investigating.

Cadence was touched, in any case, by the filly's concern. "It'll be fine, Twilight."

Her sitter's genuine smile convinced the filly, and she relaxed and fixed her eyes again on the pink pony's pastel purple wing.

Cadence extended it for her again, and lowered herself to rest on the playroom floor. "Come look closer." Her own beckoning caused the bright pink princess to shudder excitedly, to call for the cute filly to touch and handle them.

Twilight didn't need to be asked twice. She stepped around the other tea party guests, unconcerned with what her dolls would soon be witness to. Truth be told, she'd reenacted her and Cadence's horn-sucking session with Smarty Pants several times. She knew it wasn't allowed by the adults, but it somehow didn't scare her—somehow just made it all more interesting. Knowledge was free, not to be withheld by silly rules. She had to seize it now, while Shining and Mom were out, or she just knew it would be an eternity before she got another chance to know.

Twilight stood before the princess's impressive limb, and Cadence bit her lower lip and looked with a half-lidded, smiling expression at the filly the same way Twilight remembered she'd done just before she'd taught her about horn-love. Noting the similarity, Twilight waited for her sitter's instruction. Last time there had been instructions. She was really good at following instructions.

Seeing the filly's expectant eyes meet her own, Cadence didn't disappoint. Clearing her voice with a light cough, she started, "These—" Cadence spread the feathers at the tip of her wing "—are the primary feathers."

Twilight looked perplexed. "But pink and purple aren't primary colors."

Cadence held back a chuckle. "That's right. They're called primary feathers, not because they're primary colors, but because they're the first feathers. ... Just like primary colors are the first colors that you use to mix and get other colors," Cadence thought for a moment, "the primary feathers are the first, most important feathers I use to fly."

Twilight's expression lit. "Oh!" The filly raised a hoof to her chin, processing the new information. "So... are these..." she indicated the outer feathers closer to Cadence's barrel with an outstretched hoof, "secondary feathers?"

"Wow! Great job, Twilight!" Cadence praised. "You're a great student."

Twilight Sparkle beamed, and her eyes twinkled proudly. "Can I... touch them?

"Mm-hm!" the pink alicorn nodded patiently.

Twilight ran her hoof along her caretaker's stiff, silky, flight feathers and was pleased to hear her hum and sigh lightly. Stroking the smaller feathers behind the large primaries and secondaries, the filly noticed they were softer along the edges. Seeing that she'd mussed some of them, the little unicorn attempted to smooth them down again until only a couple of the smaller ones stubbornly remained uneven. Tilting her head, the young unicorn scrutinized them. "What are these ones called?"

"Covert feathers. They cover and protect the wing arm." Cadence stretched and shrugged her wing arm subtly and the smile across her lips grew.

Twilight pressed into the strong limb's muscle, causing Cadence to shudder and melt a little. "Oh!" It made sense suddenly to Twilight. It was like Cadence had said. There was something like a leg there. "Arm?" the little filly confirmed.

Cadence sighed at the continued stimulation to her limb and nodded. "Right." Her reply was breathy. "When I preen," she continued to the part she'd been most eager to start, "I gently use my lips, teeth, and tongue to straighten each feather. Are you ready to learn how?" Cadence tried not to pressure the filly, but her anticipation had been building ever since the young blank-flank had asked her to teach her.

Her mature friend seemed as eager as she felt, for once, Twilight noticed, and it brought an excited, toothy smile to her face. "Uh-huh!"

"Alright." Cadence blushed at the shamelessness of what she was about to do. "Watch closely." The purple-winged, pink, young mare twisted her head back and bent her wing shoulder forward. With a look at the filly that Twilight had only seen once before, the princess stroked the lesser covert feathers with her nearest cheek.

The filly watched intently, trying her best to pick up the experienced preener's technique. Cadence made her progress slowly and paused between the normally fluid gestures that made up her routine. The young mare's nethers tingled and moistened more quickly than usual, glancing frequently at the filly's stare. After only a minute, she paused and faced her little pony. The mare's lips seemed to glow subtly with her own oils. "N-now you try," Cadence prompted softly, offering Twilight the more sensitive underside.

Twilight didn't hesitate to gently bury her small muzzle in her foalsitter's plumage, but took a moment to process the musty-sweetness of the mare's feathers. It was odd. Twilight had never known birds to smell, but her winged caretaker had a distinct aroma, not at all bad, but not good in the common scratch-n-sniff sense—new.

Twilight's tongue and lips set to work.

At her foalsitter's heavy breathing, light, intermittent trembling, and happy moans, the filly was strongly reminded of her experience with Cadence not a month ago. She remembered what it had been like to have the older pony's mouth surround her small horn, polishing it lovingly with her delicate lips and warm tongue. Twilight blushed happily at the memory and let it drive her to continue to try and please the pony she admired and loved—who she knew loved her back.

As Twilight neared the end of Cadence's wing arm, she knew she hadn't done a great job at making the feather's straight, but the encouraging gasps of her older friend allayed most of her worries. “Twilight—” Cadence panted “—do me—a favor—please—and—nibble—right there—at the end!”

Twilight would have liked to ask how hard, but, judging by the princess's state, she thought she'd better just guess. Doing her best to be gentle, Twilight did as she was told, and, immediately, Cadence let out a satisfied, high-pitched moan. “Yes! Yes-yes-yes-y—” Cadence squeaked her final approval incoherently, the walls of her marehood contracted powerfully, and her face blushed brightly.

“Ohh—Twiley!” the little filly was thrilled to hear her name pronounced in ecstasy the same way she'd heard her mom and dad do during their special alone time—more confirmation of ideas she'd had about the meaning of their noises and the way her own orgasms felt caused the little filly to fight her impulse to grin widely at the success of her fact-gathering while she worked the digit at the end of her brother's special somepony's wing, oblivious to the consequences except that now she knew she would always be super special to the kind pink princess.

“S-ss-sssah-ahfter!” Cadence flinched a little until the filly obeyed, and she relaxed and blissfully rode out the remainder of her orgasm with a deep, satisfied sigh.

Biting her lip, Cadence grinned uncontrollably. “That was so wonderful, Twilight. Thank you!”

The filly stopped and looked back to grin at her in return. She inspected her progress on the wing she'd attempted to preen. Considering it had already been nice and straight before she started, it looked a little worse now than before Twilight had started. “Your wing... I... didn't make the feathers straight.” Little Twilight felt bothered, like she suddenly needed to fix it, never mind the fact that she hadn't started on the second one yet.

“That's alright, Twilight. It was your first time. I can fix them in a little bit, and maybe you can try the other wing if you still want practice, but...” despite knowing they had the whole afternoon together, Cadence looked from side to side to make sure they were still alone, “first, I'd like to return the favor.”