"Oh man, what am I gonna do? Hearts and Hooves Day is tomorrow and I still dunno what I'm gonna get her!" Silver Sickle was on the verge of hyperventilating.

His cousin and close friend, Tungsten Twirl, was sitting across the table, drinking an apple, banana and peanut butter smoothie. "What's she like?" she asked.

"She's the most loving sis… uh, mare I've ever known. She's beautiful and kind and full of energy. She's perfect is what she is, and I can't think of a gift to give her!"

"I know a pretty good gift, actually. One of my ex-coltfriends gave it to me a couple years ago. Nopony's topped it since."

"Really? What is it?"

"Dick in a box."

"Beg pardon?"

Tungsten took another sip of her smoothie, her eyes unblinking, and swallowed the thick white liquid. "Dick in a box."

"I— wha?"

"It's really simple. One, cut a hole in a box. Two, put your junk in that box. Three, make her open the box."

Silver shook his head, trying to bring himself back into the moment. "So, you're saying I should sit on the couch or wherever with a box over my junk, and have my sis… marefriend open it?"

"Yup, simple as that. You're gonna need a big box, though, cuz."

Silver blushed. "Uh, thanks?"

To say Silver was nervous was a huge understatement. It was Hearts and Hooves Day evening, and his and Copper Crescendo's parents had gone out to dinner, leaving him and his sister alone in the house.

"Step 1… cut a hole in a box," he recited from his memory of Tungsten Twirl's advice. Using his magic, he picked up a pair of scissors and cut a circular hole in the bottom of a tall gift box he'd bought at the store the day before. "Step 2… put your junk in the box." His dark gray length had been getting hard the entire afternoon while he'd nervously and repeatedly considered the ramifications of his plan. He tested the size of the hole by gently pushing his cock through it. It fit just right, completely encasing him, with his tip barely grazing the lid of the gift box.

He pulled his junk out of the box and took another minute to steel himself for the rest of his plan. "Step 3…" he said. "Make her open the box."

Still jittery, he made his way downstairs and sat on the couch. He took a moment to fantasize a bit about his sister. In his mind's eye, she stood before him, and he let his concentration wander from her unruly mane, over her copper-furred curves, to her wings, to her unadorned flank, before settling on the rump he so wished was his. He slid the box over his hardening shaft as it reemerged from his sheath. All that remained was to get his sister to open it.

"Hey, Copper!" he called to his sister, trying to keep his voice steady. "Can you come down a minute? I have something for you!"

"Yup! Be right there!" she called back from upstairs. A moment later, the sound of hoofsteps on the stairs signified the pegasus's approach.

Silver's heart beat ever faster in his chest, and he began to feel light-headed. He took another few breaths to steady himself as Copper came into the room. "H-hey," he stuttered. "I, uh… I got you something. For Hearts and Hooves Day." He nervously tapped his rear hoof on the ground.

"Why so nervous, bro?"

"I just, y'know… I really hope you'll like it." He began to break out into a sweat. "I really, really do."

She had an uncertain look on her face as she turned her eyes to the gift box in Silver's lap. "I'm guessing that's it? In your lap there?"

"Ah, yeah. You wanna open it?"

"Alright." She came around the side of the sofa and stood in front of her brother with a bemused smile. Raising a hoof, she nudged the lid of the gift box upward, allowing the light to spill in and illuminate the surprise inside.

She reared up and gasped, her eyes going wide as she brought her forehooves to her mouth. Silver grimaced, looking away with his eyes squeezed shut. A tear formed in his good eye. He should have known what her response would be. There was no way this ever could have ended well for—.

"SQUEE!"

What? Silver looked up through the white strands of his mane.

"Ohmigosh, how did you know?" Copper gushed. "It's what I've always wanted!"

"You what?" Silver absolutely had not expected this reaction.

"Well, maybe not always, 'cause I don't remember being a newborn, but holy hay, this is the best Hearts and Hooves Day gift ever!"

"There is no way this is happening right now," Silver said, his voice full of disbelief.

Copper tried to calm down and compose herself. "Okay, look, I've had… fantasies about you for I don't even know how long. I just… I didn't know how to tell you."

"Well, uh, first time for everything," Silver replied, his breathing returning to normal and his thoughts not racing quite so much. "I spent years thinking about you, and I just couldn't let it go on any longer. I had to do something, y'know?"

"I'm so glad you did. Thank you for doing what I wasn't brave enough to do."

"So… now that this is all out in the open, what are we supposed to do?" He thought for a moment. "Mom and Dad aren't going to be home for at least a few hours."

"Well, I have to say, I've always been curious about that smell you have in your bedroom sometimes. I couldn't get enough of it." She shrugged. "I mean, I wanted to bathe in it."

"Well, let me get this box off, and maybe I can help with that," Silver Sickle replied with a wink.

Copper took the initiative, sliding the box up and off her brother's shaft. It had softened a bit while they'd been talking, but the smell, the musk Copper had mentioned, was indeed there. She traced it down to her brother's balls, the smell emanating from them immediately catching her attention.

"Mmph," Silver grunted as his sister buried her muzzle in his ballsack. His length became rock hard again under the stimulation.

"Oh, man… wow," Copper muttered with her nose pressed against the point where his shaft met his sack as she breathed in the scent of her Silver's balls. "Th-that's really s-something."

Silver glanced up to notice Copper's tail flagging noticeably. A new scent was beginning to fill the room, too, coming from somewhere near his sister's backside. Silver's cock grew even harder than it ever had before, to the point of ache, and a wetness gathered at the tip as it throbbed.

The heavenly scent of her brother's musk enticed Copper into tasting the source, and she stuck her tongue out to place a long lick on the smooth gray skin of his sack.

"Ooph," Silver moaned. Wanting nothing more than to watch his beautiful sister fawning over him, he fought the urge to close his eyes and lean his head back.

When Silver's balls were shining with a coat of Copper's saliva, she took a final deep breath of his musk and pulled away, backing up to witness her brother's erection. It was long, to be sure, and relatively thin, with a smooth, gray shaft interrupted only by a pronounced medial ring and a proud flare near the top. A new smile crossed Copper's face at the thought that it was there because of her—proof of how much he really loved her and wanted to be with her. She made a vocal resolution: "I'm gonna suck your cock."

Silver moved his hooves away, spreading his hind legs wider to give his sister better access. He tried to keep his cool, but his heart was practically leaping out of his chest at the thought of his own sister going down on him. His increased heartbeat made itself known in the throbbing of his cock, earning a giggle from Copper as she knelt before her brother.

"I've never done this before, you know," Copper said as she took hold of the base of the cock before her.

"H-hah, you're already doing great," Silver managed to reply, just the feeling of foreign hooves on his sensitive shaft nearly short-circuiting his speech centers. A spurt of pre-cum launched from his tip, arcing through the air and landing on his sister's muzzle. She licked it up almost without a second thought.

"Wow… That tastes even better than your balls." Copper could feel her own heartrate rising at the prospect of servicing her brother the way she'd wanted to for so long. Gradually, she leaned in, letting her tongue out of her mouth again as she drew close to the base of Silver's shaft.

Silver took a sharp breath when the wetness of Copper's tongue connected with his sheath. Drawing up and away from the wrinkled skin, she dragged her tongue along the shaft toward his ring. She hugged her brother's cock to herself, her chest fur tickling him as she passed over his ring and on to his tapering upper shaft. The taste of Silver's lubricating pre-cum as it trailed down his shaft hit her tongue again, and she released an involuntary groan as she passed over it.

Finally, her long, languorous lick ended at the ridge of his flare. Silver had tensed up, the feeling of his sister's tongue on his cock sending unimaginable shocks of pleasure through him. His body relaxed a bit when Copper pulled her tongue away, but he quickly found himself going rigid as his sister's warm breath flowed over the flattened tip of his cock. "You ready?" she asked.

Though he couldn't imagine what "ready" might have meant, Silver nodded quickly anyway—she was offering to make his dreams come true.

Copper moved forward again, fighting to keep herself from just throwing herself forward and engulfing her brother's cock. It twitched as she angled it down toward herself with her hooves, presenting the drooling tip for her to taste.

"You ok?" Silver asked, looking down at Copper.

"Y-yeah…" she said. "Just looking."

"Don't force yourself. We can do something else if you— hoo!" Silver was cut off by a rush of sensation as Copper leaned in and began to licked around the ridge of his flare. She looked up at Silver's face and delighted in the expressions crossing it as she swirled her tongue around the tip.

Soon, she moved her head down and engulfed his flare in her mouth.

He was narrow enough that it didn't take much effort to spread her lips around him or keep her teeth out of the way. If anything, he was the perfect size. She felt as if she could suck on the dark gray tip of her brother's cock all day, like a lollipop—only much better tasting.

For a while, Copper kept herself there, letting herself get used to the idea of having a cock in her mouth in the first place, much less her own brother's. To know that it was his throbbing flesh filling her muzzle, his pre-cum leaking onto her tongue—indeed, the knowledge that the blood pumping through it flowed through her veins, too—was almost beyond her ability to reason. And yet she kept the realization in the forefront of her mind as she began to bob her head up and down on her brother.

Silver panted, his forehooves scrabbling at the couch cushions as the wet, hot assault of sensation over his flare and tip grew ever greater. His sister kept her tongue swirling around him and over his tip. She was completely new to the experience as well, but her enthusiasm more than made up for any lack of technique.

Copper felt Silver's flare begin to grow in her muzzle, filling out as he grew closer to shooting his load into her mouth. She only sucked harder on him, pushing her brother further in hopes of tasting his cum. "Holy Celestia… I'm gonna—" Silver stammered as he felt himself rushing toward his peak.

Finally, with a drawn-out groan, Silver let himself go. A rushing sensation filled his cock as his cum flowed up it and shot out into his sister's mouth. It was the heaviest orgasm he'd ever had, and Copper was relishing every drop of it. She swallowed greedily at the ropes of cum as they filled her mouth, but she wasn't fast enough to handle it all before it began to fill her mouth up. Soon, her cheeks were puffed out, spurts of cum leaking from the corners of her mouth. The cum swirled down her throat in waves, and some of it even squeezed up her nose and dribbled out of her nostrils. But still she kept her mouth on him, intent on taking every last bit of her brother's semen.

The entire time, Silver was thrusting fitfully into his sister's muzzle, instinctually doing everything he could to milk more pleasure from her warmth. His panting and moaning increased in volume with every jet of semen he shot into her mouth. Eventually, though, even this good thing had to come to an end, and Copper was soon able to swallow his loads more readily as they tapered off in volume and frequency. He slipped out of Copper's mouth as he slumped back on the couch.

Copper kept his final load in her mouth and tapped Silver's knee to get his attention. He managed to open his eyes again and look at his sister. She had opened her mouth to show him the cum she'd kept there before closing it again and swallowing. Her front was covered in drips of Silver's cum, as was the floor. Her face was marked with white, and a string of cum still oozed from one of her nostrils. Nevertheless, nothing else had ever made her as happy as her first time drinking down her brother's cum. "Mmm…" she said. "That was… I can't even tell you how amazing that was."

"You were amazing, too, sis," Silver said as his breathing returned to normal. His cock was softening, retreating back into its sheath as he came down from the high of having the sister he'd dreamed of for so long suck him to completion.

Copper blushed as she got to her hooves and sat next to her brother on the couch. Leaning against Silver, she brought a hoof up and rubbed at her belly. "It feels so warm," she remarked.

"Glad you liked it as much as I did," Silver replied. "But what're we supposed to do now? I mean, you just sucked off your own brother. Some would call that a crime against nature."

"I dunno, Silver. Crimes against nature feel pretty good, don't they?" She looped her foreleg around Silver's shoulder's and pulled him closer, planting a kiss on his cheek. "Regardless, you really can't expect things to go back to normal after this."

"There was a normal?" Silver chuckled, looking down at his sister. "You mean when we were both silently fantasizing about each other?"

"Touché." Copper reached over and stroked where the tip of his penis was poking out of its sheath. Silver's eyes crossed over slightly as his crotch began to stir again.

"But should we go further? Is there a further to go to?"

"There's always a further, Silver. But let's get one thing straight: If we're gonna go further, I don't want foals."

"Neither do I." Silver shrugged. "But I think it's your call what you want to do about that."

"It's simple." Copper stood up and walked a short distance away, spreading her wings and flagging her tail at her brother to reveal her backside. "I want you to rut my ass as hard as you can, as often as you can."

Silver's eyes went wide. "No joke?"

"Not a bit."

Is this real? Silver wondered. There's no way my sister wants me to pound her in the butt! Outwardly, though, he was on autopilot. His body carried him off the couch and toward his sister.

She had her legs spread and her tail pulled to the side, exposing her dripping marehood and quivering tailhole to the air. Her lower lips parted, thrusting her clitoris out in a wink. That was an enticing sight all on its own, but Silver's eyes had always been more drawn to Copper's tailhole. There was something about her pucker—possibly how tight it looked, or the taboo of performing such an intimate act with a place so commonly seen as dirty—that gave it an allure her pussy couldn't hope to match. Regardless of the reason, the only important fact to Silver Sickle was the pounding he was about to give it.

Copper locked her stance, bracing her hind legs against Silver's weight as he settled himself atop her. Hearing her brother's cock slap against his belly as he prepared to take her put a giddy grin on her face. Silver inched forward, shuffling his back hooves and pulling himself along by hooking his forehooves over her wings. Soon, he felt his tip butt up against his sister's backside. It glanced off her soaked pussylips and slid under her barrel.

"Mmph, a little higher, yeah?"

"Yeah. Hold on a sec."

Some of Copper's juices dripped down onto Silver's shaft, wetting it and acting as an impromptu lubricant for the coming penetration. Realizing this, Silver rubbed his length under Copper's pussy to catch more of her fluids. A few times, he grazed against her clitoris in the middle of a wink, earning a soft moan from Copper.

After a few moments of this, he backed up enough to let his shaft out from under his sister's barrel. Flexing his pelvic muscles, Silver pulled his cock higher and pushed himself forward again. This time, his newly-slickened tip hit its mark, pushing squarely against his sister's tailhole. The quivering ring of muscle didn't budge.

Copper tensed up at the feeling of a foreign object prodding at her anus. She tried to relax and release the tension building up in her rear, but to no avail. "O-okay, just start pushing. I'll get used to it."

"If you say so, sis." Silver took a breath and began to push against his sister's pucker. He made a little headway, owing to the pussy juice coating the flattened tip of his cock, but soon found himself simply mashing against her sphincter. "You gotta relax, Copper," he said, rubbing her flank. "You're really tight."

Copper nodded and tried to concentrate on relaxing herself. She closed her eyes and focused on memories and feelings that had brought her peace and joy.

Silver began his push in again, gaining more ground against his sister's tightness as she loosened up a bit. Slowly, it began to spread to accommodate his modest girth, stretching out toward the ridge of his flare. Silver restrained himself from simply jamming his hips forward, as much for his sister's comfort as to avoid jerking himself away from her tailhole. He could already feel her clenching around his slickened tip, trying to tighten up again as the widest point of his flare reached her anus.

And then, suddenly, he was inside her. Her pucker finally admitted his flare, letting a few inches shoot through it before clenching and regripping at the thinner point below. Copper gasped at the feeling of being stretched around her brother's cock, at the fullness that came with having him buried in her tailhole. Her jaw fell open letting her tongue loll out of her mouth

[some shit]

Author's Note

If this gets enough downvotes, maybe I'll consider finishing it.

Just kidding!