Please

by Megapone

Rating: mature
Tags: Slice of Life, Drama
Length: 21365

Twilight Sparkle wants to know about “The Talk.” When Shining Armor refuses to tell her what it is, she casts a spell on him that can make any stallion "cooperative." What she doesn’t know is the reason why: It keeps its victim from orgasm.

Twilight Sparkle has heard about something called “The Talk.” She’s asked everypony she knows about it: her parents, her teachers, even her friends. None are willing—or able—to tell her what it is. Finally, she turns to her B.B.B.F.F. for answers. When he, too turns her down, she casts a spell on him that she’s read can make any stallion cooperative. What she doesn’t know is the reason why: It keeps its victim from reaching orgasm.

As Twilight's spell does its work, Shining grows more pent-up by the day. To make things worse, he can't help thinking about his little sister in a way that no big brother ever should. And if that wasn't bad enough, he's beginning to embarrass himself in public, whether by a set of plump, drooling (and swelling!) nuts or a wandering eye for his sister's flank.

Pushed to his limits, Shining might find himself pushed to indulge his sister’s supposedly innocent request. After all, it’s always wisest to give a curious Twilight what she wants. And if he does, there’s a good chance that he’ll give her a hooves-on lesson, too—and one that she'll be sure to remember.

Updates every 1-2 days.

Contains: [spoiler]Orgasm Denial, Incest, Foalcon/Underaged Sex, Excessive Cum, Public Erections/Leaking, and light Cum Inflation[/spoiler]

Published 1970-01-01 00:00:00 UTC
Last updated 2015-11-26 03:29:29 UTC

Chapter One

“Please?”

“No.”

Twilight pouted. It was that adorable little filly pout, too, the one where she curled up her lower lip and let her muzzle wobble for maximum effect. “But why?”

“Because,” Shining said, “I am definitely not the right pony to be telling you about that.” He unlatched his schoolbag. A few textbooks and notebooks floated up into the air. Meanwhile, his cheeks were a bright, flushed red, and his muzzle was twitching uncomfortably.

“But that’s what everypony else said!” Twilight said. She flopped onto Shining’s bed and groaned. Her stubby filly legs stuck out behind her and waggled cutely. “I asked my teacher, and she wouldn’t tell me. I even asked Moondancer! She didn’t know! She said she’d never heard of ‘the Talk’!”

“Go ask Mom and Dad,” Shining said. His biology textbook hit his desktop with a clunk and he winced. “They’re the ones who’re supposed to tell you, anyway.”

“I tried! They won’t!” Twilight’s legs flexed out around her. “Mom said she’d tell me when I’m older, and Daddy just mumbled something and walked away.”

“Then there y’go,” Shining said. He floated his pencil case out of his satchel and retrieved his quill and inkbottle. “You just have to be patient, Twily.”

“But I don’t wanna be patient.” Twilight’s head hit Shining’s lumpy pillow with a thump. When she spoke again, her voice came out all muffled. “Somepony’s gotta tell me!”

“Look,” Shining said. “Sometimes you want something, and you just have to wait for it, okay?” C’mon, Shining, he told himself. Here’s a Big Brother Moment. Gotta share some of that trademarked older sibling wisdom. “And I know how you feel. But you’ve got to be patient and let Mom and Dad tell you when they’re ready.”

Twilight jerked her head out of his pillow and glared at him. “Says you,” she said sullenly. “I bet Mom and Daddy do whatever you want.”

“That is...not true. At all.” Shining levitated his assignment book from his bag and groaned inwardly. It was going to be a long night, and his biology exam on Monday… Well. He didn’t really want to think about that. “Look, Twily. I’ve got a lot of homework. Would you mind leaving me alone to do it?”

Twilight’s glare only got sulkier. “I bet you could tell me,” she said.

“Maybe I could,” Shining said, “but I won’t. Sorry. Not my job.” He shook his head. “And I’ve got a whole suite of math problems to work through. So if you wouldn’t mind…?”

Twilight brightened immediately. “Ooh!” she said. “Maybe I could help you with those! And then—”

“No, Twilight,” Shining said. He didn’t want to let her go any further. Instantly, Twilight’s ears went back. “It’s my homework, and I’m going to get it done properly. And like I said, I can’t tell you.”

“Can’t? Or won’t?” Twilight muttered.

Shining sighed. “C’mon, Twilight. This is getting a little bit silly now.”

“You’re silly!” Twilight threw up her hooves. “Mom and Daddy are silly. Moondancer is silly. Everypony is silly because they won’t tell me what I want to know! I can’t even find any books about this!”

“Twilight—”

She hopped off of his bed and landed a bit unsteadily on her hooves. Shooting a glare over her shoulder, she said, “I’ll find out. Somehow,” and walked out.

The door slammed shut behind her.

Shining sighed. Somehow, he had a feeling that that could have gone better. And that look in Twilight’s eyes—he knew that filly. Her curiosity wouldn’t be abated. If anything, his refusal to help her would only drive her even further up the wall.

For a moment, he wondered if this might be a problem. Once Twilight had her hooves on a question, she’d never rest until she’d solved it. She was going to sink her teeth into this one, too, one way or another.

Turning back to his textbooks, Shining let his shoulders relax. Hopefully, he thought wryly, Mom or Dad would take care of this. As much as he liked being Twilight’s B.B.B.F.F., this was one topic that he definitely didn’t want to share with her. A few splotches of red still dotting his cheeks, he shook his head, brushed his mane out of his eyes, and got to work.

Shining Armor was a stereotypical adolescent in many ways. While he worked a bit harder at his schoolwork, preferred classical rock to modern music, and liked Ogres and Oubliettes more than anypony else in his gym class, he was mostly a regular colt. He liked to procrastinate, enjoyed looking at pretty mares, and woke up late on Saturday mornings.

He groaned softly, nuzzling closer against his pillow as rays of sunlight brushed against his eyelids. He felt warm, comfortable, wrapped in a cocoon of tight blankets and sheets. There was an almost pleasant weight on his chest. For a moment, the image of Cadance, her hoof curled around him, flickered back into his dreams. His muzzle curled into a smile.

Then, the bubble of sleep popped around him. His eyes cracked open. Shining squinted as his mind slowly worked back toward lucidity. There was a figure above him—somepony standing on his chest. Cadance? his hopeful, dreaming mind offered. But Cadance wasn’t that purple. And Cadance wasn’t that small, either...

“Bwuh—Twilight?” Shining blinked blearily. He yawned. “G’morning, Twily.”

There was a comfortable tightness around his crotch, he realized. As though something—or somepony—was rubbing again. Shining blinked a few more times, his sluggish thoughts starting to move back into a waking state. His vision resolved fully. Twilight was straddling his crotch, leaning over him with her horn pointed directly at his chest. Something thick, heavy, and very hot was rubbing against her underbelly through the sheets.

“Guh!” Shining quickly pushed her back. Twilight let out an “eep!” of surprise as he shoved her off of his morning wood. Blushing furiously, Shining hoped she hadn’t noticed anything. Then, his mind sharpening, he realized that her horn had been sparking.

“Hey!” Shining asked. He picked her up with his magic and levitated her over the bed. A second thread of magic branched off from the first, quietly rumpling up the sheets so that the bulge at his crotch wouldn’t be quite as noticeable. “What’re you doing in my room so early?”

“Early?” Twilight raised an eyebrow at him. “It’s eleven in the morning.”

“Before noon. Early.” Shining yawned again—but then remembered what Twilight’s horn had been doing and stopped himself. “And what were you even doing?”

“I was using a spell,” Twilight said. Shining floated her back down to his bed, far away from his groin.

“A spell,” he said.

“A spell!” Twilight smiled down at him. In that instant, she may as well have been the most innocent, purest creature in all of Equestria. The spell quickly broke, though, when she added, “To get you to tell me what ‘the Talk’ is.”

“Very funny, Twilight.” Shining levitated her down to the carpet. He frowned down at her. “Try again.”

“No, really!” Twilight was beaming. “It was a spell I found to make a stallion do anything you ask him to!”

A shiver went down Shining’s spine. “Twilight…” he began. “Where did you find a spell like that?”

“In my teacher’s special book,” she said. “She left it on her desk in class yesterday, so I took it home with me. It had lots of weird pictures, but also this spell! I thought it might come in handy to get you to tell me.”

“Twilight,” Shining said. No “Twily” right now. “That is not the kind of spell you should be casting on other ponies.”

For a moment, that mischievous glint, that insatiable curiosity twinkled in Twilight’s eyes. “And why not?” she asked. “If ponies won’t tell me something…”

“Okay, first off, that is really poor ethics.” Shining paused and prodded at his muzzle. “And secondly...I don’t think that spell did what you think it did.”

“Uh-huh?” Twilight said. The glint of victory was in her eyes. “Well, then. Shining Armor! I order you to tell me what ‘The Talk’ is!”

A shiver went down Shining’s spine. She sounded so self-assured, so confident. But then again...this was Twilight. She—thought she’d—done her research. Of course she was sure of herself. And yet…

Shining raised an eyebrow. “Nope.”

“But—”

“I don’t think your little spell is going to work, Twily,” Shining said. “I sure don’t feel any different.”

Twilight’s face reddened. “Tell me!” she squeaked. Her little cheeks puffed out adorably. “Jump up and down! Go run down the stairs! Go—nggh—do your homework!”

“Mm,” Shining looked down at her with a faint amusement. “Nope.”

“Agh!” Twilight turned and ran out of the room.

“Hey!” he called after her. “You should really—” His voice trailed off halfway. “Give...back...that book.” He sighed.

There probably wasn’t a book, in all likelihood. Twilight might have dreamed about it. Her spell hadn’t worked, after all. There probably wasn’t even a spell. Shining, at least, was fairly familiar already with dreams giving a pony just what they wanted.

Blushing slightly, he moved to lift the covers off of his body—and then remembered his “friend” still waiting under the covers.

Unconsciously, Shining’s crotch flexed. A throb went through his member, and Shining shuddered pleasurably. There was already a small damp spot growing against the place where his morning wood had been rubbing against the underside of his sheet.

Twilight might have woken him up early, he decided, but as long as he was primed and ready… Shining bit his lip and glanced toward his door. The hallway was clear. He telekinetically swung his door shut then turned back to his blankets.

If there was one thing that every teenage colt learned, it was that it was a terrible thing to let a boner go to waste. Shining couldn’t help the small, silly grin on his face as he lifted up the sheets to see his healthily throbbing erection waiting for him. It was draped against his left thigh, a small drop of precum beaded at the tip.

He reached down to touch it and shuddered again. It was at that perfect point between softness and hardness, where every touch was an invitation for more, and even the slightest tease could feel like heaven. Shining licked his lips, then gently pushed his member up over his stomach.

It slid across his stomach easily, the shaft slick with the pleasures of last night’s more exotic dreams. Shining wasn’t quite a full-grown stallion yet, but he knew that he was a bit bigger downstairs than most of his classmates. Most of the time, their equipment was tucked away into their sheaths, but more than one growing stallion had gotten unintentionally hard in the middle of a post-gym shower. Random boners were just a fact of life. Another fact of life, Shining had learned from a few stolen glances, was that even his next-”largest” classmate’s shaft only came up to the bottom of the flare on his own.

An average stallion’s length was eleven inches long. Shining’s was fourteen, and still growing. Idly, he wondered how big Dad was—and quickly shut off that line of thought. Every colt remembered how “big” their fathers were, from half-caught memories of childhood shower help. But Shining knew enough to know that a tiny colt's perspective differed quite a bit from reality. Somehow, the thought that he might be bigger than his father down there sent a spark of excitement up Shining’s spine—and it was exactly that kind of excitement that he suddenly felt he should not be trying to think about.

He turned back to his needy erection instead, and pushed thoughts of comparison aside. At the very least, there was no disputing the fact that he was pent up from a night of longing dreams. His balls were nice and plump, and he found himself longing for the sweetness of release. Blushing again, Shining touched the middle of his shaft and summoned up a few memories of Cadance. It didn’t matter from where: in the hallways, in class, in gym, with a few beads of sweat dripping down her prime, firm flank—

Unbidden, another image came to Shining’s mind: Twilight, her little filly’s legs straddling his crotch, her soft little fillyhood rubbing against his member through the sheets. Shining violently tried to shove that image away—but a generous splatter of precum against his belly hinted that he may have liked it more than he’d thought. More than a little bit disturbed—she was his sister; what kind of twisted colt even thought about that?—he turned back to thoughts of Cadance.

That flank filled his mind’s eye. Shining smiled goofily as images of her bouncing cheeks bounced up and down in his thoughts. His hoof gripped tightly around his length, making its way up and down in long, steady strokes. Shining squished his shoulders against his headboard, letting his body sink a little bit deeper into the bed as he lost himself to the rhythm.

Stroke, schlick, stroke. Pump, squeeze, splurt. Shining’s nuts felt particularly heavy that morning. As his right hoof worked his hardening shaft, his left hoof went down to his ballsack. On a whim, Shining grabbed one of his balls and gave it a squeeze. Instantly, his whole body went tense. A soft moan slipped out from his muzzle.

He quickly shut himself up. For a moment, he sat paralyzed, wondering if anypony had heard. Silently, he sat with his ears perked, listening for that telltale creak of the stairs outside his door. After a moment, all he heard was the clink of faraway breakfast silverware, and relaxed.

Still… That had felt good. Rubbing his shaft, Shining stifled a soft sigh. His cock throbbed eagerly for more. Tenderly, he reached back down and grabbed a hold of his nut again. It felt odd in his hoof: warm, heavy, plump.

He gripped his weighty nut and, unsure of what exactly he was going to do, began to knead it. His cock kept rising upward, pushing against his chest and matting his fur with precum. His arousal was reaching a peak. Shining gave his ball another squeeze. Once again, he was powerless to stop the groan that escaped through his muzzle, or the wet drippings that streamed down his shaft. His crotch tensed and his cock lurched. His stallionhood slapped wetly against his belly and a hefty glob of salty precum splattered the bottom of his chin.

He was getting closer—he could tell. The sense of pleasure was absolute: a warm, buzzing feeling that was streaming through his veins, every stroke of his hoof down his shaft sending another wave of endorphins shooting through his brain.

Shining began to pant. He was powerless to keep his hoof off of his nutsack. In fact, he was kneading both of them now, massaging his testes’ smooth, rounded surface with a hoof slick with precum. He squeezed his shaft harder and stifled a moan. His hips began to jerk forward, too, his body thumping on the mattress as he drew closer and closer to his climax.

His member slapped wetly against his belly, more and more precum matting his white fur together. Shining began to whimper softly. He felt himself approaching the edge, that familiar warmth and pressure building at his crotch. He felt his penile muscles tense, flexing and relaxing repeatedly as he drove himself toward that peak. His eyes squeezing shut, he gave his hefty nutsack a squeeze and loudly moaned when he felt the cum sloshing inside.

With a grunt harsh enough to resemble coughing, Shining let himself go over. His hips jerked wildly, his shaft went fully erect, and his balls retracted up toward his stomach. He prepared himself for his oncoming release.

It never came. In the blink of an eye, every bit of that pressure vanished. The heat, the power, the feeling of falling off the edge of a precipice—it was all gone. For a moment, Shining didn’t know what had happened. Somewhere in his imagination, he saw his hips bucking, ropes of cum splattering against his chest as he met his morning release.

But it didn’t happen. Instead, Shining was left wide-eyed, breathing heavily as he stared down at his erection. It was softening slowly, returning to flaccidity as though he’d just orgasmed. And yet he knew he hadn’t. He was dry, he was clean, and even above that, he still needed it. Shining quickly drew back his hoof from his balls; the weight had somehow stopped feeling strictly pleasurable. Instead, he felt almost...tight. Unfulfilled.

There came a knock on the door. If Shining had been a pegasus, he might have flown straight up and smashed his head on the ceiling. As it was, by pure reflex his horn lit up brighter than a Hearth’s Warming firework. The covers whipped over his crotch to conceal it from view. Forcing an uncomfortable smile onto his face, Shining put on his best imitation of a cheery morning voice and said, “Yeah?”

“Shiny? You up in there?” It was Mom.

“Uh, yeah!” he called back. “What's up?”

“Well, Twilight told me that you’d gotten up. I just wanted to let you know that your Dad made quiche this morning, and there’s a little bit left if you want it. Don’t let it get cold!”

“I won’t!” he called back. He jumped out of bed, and then winced when his still-full balls smacked against the insides of his legs. It was okay, he told himself. Everypony shot a blank sometimes. He’d just try again later. “Just, uh, let me shower first. Okay?”

“Okay, sweetie! See you downstairs!”

Shining let the clip-clop of his mom’s hooves on the stairs fade before relaxing again. Sighing, he turned to his bathroom door and levitated a towel from the dresser.

It was okay not to reach orgasm. He’d read that in a “healthy sex” column in one of the magazines that Dad sometimes hid in the coat closet. It was okay not to cum. So long as you’d enjoyed yourself beforehand. Not everypony reached orgasm all the time.

Shining pushed the shower curtain aside and levitated over his soap and shampoo. As he set the water running, his frown deepened. But he had reached it—he’d been just on the edge. He’d been there. He should’ve cum. And having not...it was one of the strangest feelings he’d ever felt since he’d known that the thing between his legs was called more than just a “pee-pee.” He felt frustrated. Unfulfilled. And confused.

Still, he thought, stepping into the shower. He eyed the bottle of mane conditioner thoughtfully. There wasn’t any reason he couldn’t try again. Once had to be a freak accident. If he got another erection—and what colt didn’t?—he could take care of it. He had to take care of it.

He hoped.

Chapter Two

As it turned out, Shining wasn’t able to take care of it—not in the shower, at least. After a good five minutes of carefully washing himself off, he hadn’t been able to resist slopping a hefty dollop of mane conditioner onto his hoof and going to work. He’d gotten hard easily enough—the warm water slipping down his back and a daydream of Cadance sharing the enclosed space with him had him ready to go in seconds.

But once again, he’d found himself reaching his peak only to immediately lose it a split second before cumming. Rubbing, jerking, squeezing his tool did nothing but make him harder. His balls felt filled to bursting with seed; each stroke of his hoof down his length just made the pressure build even further. Shining leaned his hoof against the wall as he went to town on himself, his nuts getting plumper and heavier with each passing second. He’d be so close—and then lose it all an instant before going over. Tablespoons of pre poured down his shaft, mixing with the suds before swirling down the drain and without any true release.

A frustrated Shining tried an additional two times after that, jerking himself off harder and harder until his nuts felt ready to burst, his shaft was sore, and his conditioner bottle was almost empty. Forty-five minutes later, though, the hot water was running out, the mirrors were thoroughly misted over, and he had nothing to show for his efforts but a wrinkled set of hooves and a trio of failed orgasms.

He just wouldn’t cum. Couldn’t, even—no. He couldn’t think like that. He had to be fine. This was just… Maybe he was coming down with a cold or something. After towelling himself off, Shining checked his reflection in the mirror. Nope; his eyes were a little red, but he didn’t seem pale. In fact, his face was more than a little flushed from spending the better part of an hour in a steaming-hot shower.

As he made his way out of the bathroom, his dick flopped wetly against the side of his thigh. Shining reflexively telekinetically nudged it back into its sheath, and then winced when his ballsack slapped against his thigh. He’d never had the misfortune to feel blue-balled before, but he was beginning to see why most ponies hated it. His balls felt almost painfully tight, full of unspent seed.

That was fine, Shining told himself. He slipped out of his bedroom door and clomped downstairs. He’d been interrupted in the middle of a session before. He could handle a little unfulfillment. He’d just have to try again later.

Maybe, he thought, slipping into fantasy for a moment, Cadance would be willing to help. As if that wouldn’t be taking things at twice the speed they should—and yet…

A goofy grin slipped across his face, only to vanish when the familiar image of Twilight’s flank flashed over his reverie. As his thoughts swirled, Cadance’s face slowly morphed into Twilight’s, those long, elegant lashes turning to a pair of wide, innocent eyes. Her flank shrunk in his mind’s eye, pink turning to purple but becoming softer, rounder. The filly in his thoughts wiggled her butt tantalizingly. Don’t you like it, Shining? he heard Twilight’s high-pitched voice ask in his thoughts. Don’t you like me? Don’t you want to touch me? I can help you. I can help you finish—

No. Absolutely not. He shoved that picture away as quickly as he could. Nope, nope, nope.

Maybe it was time to stop thinking about sex, he told himself. Even a growing colt could keep himself on track half the time. His balls swung heavily between his legs, and Shining winced reflexively, his tail sliding across his taint with nary a second thought.

He just had to keep his thoughts clear, he told himself as he walked into the kitchen. Mom was there, waiting for him, and Dad—

—and Twilight—

—and he just smiled and gave out hugs and asked about breakfast while pushing all erotic thoughts out of his mind.

Unfortunately, the quiche had gone cold. Shining still enjoyed every bite.

Apart from a few twinges in his crotch, he was able to make it through the rest of the day without too much trouble. Admittedly, his sheath felt a bit heavier than usual. All the same, Shining had gone a day without jerking off before. He could do it again.

The next day, he was rudely woken up by a heavy, throbbing erection. Shining had blearily glanced over at his bedside clock. It was six A.M.—on a weekend? And yet, try as he might, he couldn’t get back to sleep.

His belly was thoroughly damp from his drooling shaft. When Shining tried to snuggle back into his pillow, another splurt of pre just made his fur even wetter. Lying on his back didn’t work; the weight of the covers on his crotch just teased him even further. Soon enough, the heat building up under the covers was almost unbearable. Before long, the sheets were so slick with his pre that no matter how he shifted, the touch of fabric to his erection felt like a tongue licking across his shaft.

Shifting onto his stomach just pinned his engorged cock between his torso and the mattress, which was absolutely not a good idea. Lying on his side helped, but when he felt the puddle of pre spreading through his sheets start brushing up against the side of his thigh, he knew he couldn’t wait any longer.

This session, though, was no more productive than yesterday’s. Shining came close—closer, he hoped—but once more, not a drop of cum splurted out from his cock. Absolutely none of the release of orgasm touched his mind. At least his production of pre stopped for a time, and his erection mostly softened. It was only with a bit of difficulty that Shining was able to nudge it back into his sheath and roll back into bed, still just as horny as he’d been when he’d woken up.

What came next was more of a catnap than a proper rest, but it left him feeling more refreshed than he would have felt otherwise. Shining still wound up going through most of his morning in a daze. Thoughts of sex clouded his mind, unbidden, at least once every ten minutes. More than once, he found himself staring at his mother’s flank longingly—before snapping himself out of it and quickly looking away.

Like now, at lunch.

“Oh, Shining?”

Shining swallowed his last bite of lunch hurriedly. He averted his eyes from his mother’s flank and did his best to meet her gaze. “Yeah?”

“Your sister had some books she needed to return to the library. I also have a few scrolls of my own that are a bit overdue.” Mom gave him a smile. “Would you mind going down with her to return them?”

Shining’s returning smile was a bit strained. “Well,” he said. “I did have some homework I had to do—and a test I wanted to study for. Can’t Twilight or you just go?”

“Well, Twilight’s certainly too young to go on her own.” Mom clicked her tongue and shook her head. Turning back to the sink, she levitated Shining’s dirty dishes up into the air. “And I’m afraid I’ve got to dash off to the school for a workshop. Surely you can take your little sister on a quick errand, though.”

“Well…” Shining chewed on the inside of his cheek. This was not how he’d planned on spending his Sunday afternoon. “I guess?”

“Excellent!” A small pile of scrolls plopped down onto the table. Shining winced when a loud thump followed soon after. The vibration travelled through the floor tiles and up through his legs, sending a rumbling through his overfilled nuts. He could already feel the pre welling up again in their depths—and quickly tried to shove that awareness away into the tightest, darkest corner of his mind.

Breathing deeply to keep himself under control, he turned back to face his mother. A hefty pile of books, around an even mix of textbooks and picture books, was stacked high on the kitchen table.

“Just a bit of Twilight’s light reading,” Mom said. “I’m sure it won’t be too much trouble. Oh, I’m sure the two of you will just have an adventure together!”

Shining eyed the stacks doubtfully. “Yeah,” he mumbled. “An adventure.”

“We’re goin’ to the library. We’re goin’ to the library.”

“To return books,” Shining told Twilight. “Not to take them out.”

Twilight finished her next hop—she liked to skip along the cobblestone streets in a jumping pattern of one-one-two-three hooves—and stuck her tongue out of him. “Nuh-uh,” she said. “Mom always lets me take out a book when we go to the library.”

Shining glanced at his bulging saddlebags. “I can see that,” he said dryly. “Unfortunately, I don’t really want to bring any more back. And besides, I don’t have my library card.”

Twilight just harrumphed. At least she was quiet on the rest of the way there. Shining usually loved talking with his little sister, but he was already feeling a bit touchy that day. Probably best to keep quiet.

At least, he thought wryly, she seemed to have let go of that spell thing—not to mention that whole bit about “the Talk.” No doubt she was expecting to find a book at the library that could tell her what she needed to know. Poor kid. Still, as long as she wasn’t putting him on the spot about it…

The Royal Canterlot Library was a huge, official-looking building, but to Twilight and Shining, it was as familiar as home. They brushed in through the front door, nodded to the doorpony, and made their way straight to the front desk. Once they’d dumped the books into the Return slot, Shining felt a small hoof tugging at his side. Turning and glancing down, he saw Twilight looking up at him with a hopeful look in her eyes.

“Can I look around at a few of the books?” she asked. “Please? I don’t have to take any out.”

Shining hesitated. Then, a throb between his legs made him wince. He really didn’t want to risk getting a boner in the middle of the library. And walking home with one was not an idea that he really savored.

“I don’t know,” he said. “Mom just said we had to drop these off. I think we should just head back.”

“Oh, please, oh, please,” Twilight begged. There were little specks of moisture in her eyes, and her muzzle was turned up with the most magnificent pout. “Just for a few minutes. I can go in the foals’ section—you don’t even have to watch me.”

“Well…” Damn it; he couldn’t say no to that face. “Fine,” Shining said reluctantly. “Fifteen minutes!”

“Yay!” Twilight gave his back leg a quick hug; Shining let out an “erk” of surprise, the impact of her body against his sending his sheath smacking against the inside of his thigh. “Best big brother ever!”

“Remember!” he called back after her as she sped away. “Fifteen minutes!”

“Got it!”

He sighed when she disappeared from view. Then, he chuckled. He could survive for fifteen minutes. And she was awfully cute when she got excited like that.

Cute in some other way, perhaps? The intrusive thought curled around his brain—and his crotch—with all of the subtlety of a hissing python. The image of her cute little flank, bouncing up and down as she hopped, flashed into his thoughts. A beat later, that same image was covered in a thick, stringy white—

No. Shining shoved that thought away in an instant. He was horny. It was understandable that he might start ogling mares a little bit, especially when he was this pent-up. But Twilight was a filly, dammit—his sister! That was just…

Wrong. He shivered.

The magazine stand caught his eye, and he decided to trot over. Maybe sifting through some hoofball magazines or comics would take his mind off of things. Yeah. He cracked an uneasy smile, trying to ignore the heat of his tail swishing over his heavy nuts as he walked. Distract his id in some other way.

There was just one problem. Shining stiffened when he saw the top magazine on the shelf—and in more ways than one. Wonderbolts Weekly, proclaimed the title. Swimsuit Issue! the subtitle announced.

A bead of sweat dripped down Shining’s forehead. He tried to turn his attention to the other titles. Captain Hoofpunch, he noticed, had a new issue that month. He picked it up with his magic and did his best to scan over the cover. Unfortunately, he didn’t even pick up a single word. His eyes were too busy darting up over the top at the Wonderbolts cover image.

He recognized her instantly: Spitfire, captain of the Wonderbolts team. She was a pegasus in her prime, with lithe, smooth muscles, a perfectly preened pair of wings, and a cocky smile that covered her entire face. She was posing for the camera by leaning against a wall, her wings flared out behind her. One hoof was angled against her waist; the other was resting atop a bright blue thong, which wrapped tightly around her thighs and bumped slightly over her crotch.

Before he knew it, Shining’s hefty orbs were swaying beneath his sheath. They hung below his legs, his tail the only thing hiding them from the world. Inch by inch, his shaft slid out as well, sliding against his belly with a wet-sounding schlick until it was at least half-hard and poking up against the top of his belly.

Shining gulped. Walk away, he told himself. Go find a physics textbook. Douse yourself in cold water. Do anything but this. But he was paralyzed, stunned, locked in place as the building arousal of the past thirty-six hours ran rampant through his system.

His balls felt so full between his legs. They felt laden with seed, more than ready to spill it at a moment’s notice. A bead of pre gathered at his shaft’s tip, and Shining stifled a whimper as it dropped off onto the ground. As he stepped closer to the magazine stand, he left a damp trail behind him, his hardening erection leaking on and off as his imagination ran wild.

Spitfire’s tongue was sticking out, her eyes half-lidded, her mane slicked back as if by wind. Her hoof hadn’t been resting on her thong, he realized—just the tip had been buried below the waistband, and was slowly teasing it down. A whole inch of her left thigh was bared to the world; somehow, that tiny bit of coverage made the naked fur beneath all the more alluring.

Shining’s cheeks were burning. For an instant, Spitfire’s face flickered. Suddenly, it wasn’t the leader of the Wonderbolts standing there, posing for her picture. Now, it was Twilight—whether filly or mare, he couldn’t tell—with her tongue held carefully between her teeth, her eyes searching out his, imploring, asking, inviting—

His balls churned; his shaft throbbed. Shining flinched as a roar of arousal built up in him. He was fully hard now, his dick rubbing up against his underbelly and leaving smears of pre matting his fur. The carpet below him was fully damp, his overfilled orbs putting out more and more precum as they strained to release their true load. A whimper escaped Shining’s lips, his gaze focusing on in the centerfold even harder as his crotch got stiffer.

The brother inside of him saw her hoof twitching across the thin strip of fabric covering her crotch and shouted No! But the colt—no, the stallion inside of him—told her to go on, to keep going, to tease him and satisfy him to the end. The image’s eyes seemed to flutter, and suddenly he saw her docile, fuzzy muzzle covered in his spunk, thick ropes of his cream dripping down her cheeks as her tongue darted out to lap it up—

He tore himself away with an actual grunt of effort. Panting slightly, Shining reached up to wipe away a bit of sweat from his forehead. As he turned, his plump nutsack smacked against his leg and he actually grunted in a mixture of pleasure and pain. A hefty glob of pre spurted out from his tip, plastering Spitfire’s face with the thin, milky-clear fluid. He hastily wiped it off before turning fully back to the front desk.

The old clock on the wall announced the time: three forty-eight. Exactly seventeen minutes since they’d arrived. A tingle went up Shining’s spine, mixing with a dawning horror. He’d stood staring at that picture for over fifteen minutes…

With a start, he recognized a small figure waiting in line at the desk. A small stack of books floated beside her; as he watched, she stepped forward and plopped them onto the table before leaning against the side of the desk.

“Twily!” he said, trotting over. He did his best to ignore the twinge of pressure that came from his stallionhood slapping against his underside. He couldn’t help his rump swaying a bit as he walked, and couldn’t help the soft dribble of liquid down the inside of his thigh, which had run down his flare, across his shaft, and pooled in the space between his joint and stallionhood before running down toward the floor. He slapped a strained smile onto his face as he approached, and nodded genially at the old mare standing behind the counter. “I thought I said no books, sis.”

“Aw, c’mon!” Twilight said. A small paper card floated up to his nose. “I have my own library card and everything.”

Shining would’ve ground his teeth if she’d been anypony else. As it was, he was distracted enough already, and just wanted to get out of here. Then again, “parenting” Twilight did keep him from remembering his thoughts of her in that…other way.

“No,” he said. “Now, c’mon. Sorry for the inconvenience, ma’am,” he told the library clerk. The mare pursed her lips, but said nothing.

“B-but.” Twilight’s voice trembled a bit. “We always get new books when we go to the library.” When Shining saw her expression, he had to stifle a sigh. There were definitely a few droplets of moisture beading at the corner of her eyes, and the way her lower lip wobbled just drove him… Gah!

Twilight Sparkle was usually not a filly who partook in tantrums. All the same, Shining had a feeling that if he went up against her, he wouldn’t be getting out of here nearly as easily—or as quietly—as he wanted. Swishing his tail a bit to make sure it was still covering the back of his crotch, Shining silently thanked Celestia that the top part of the librarian’s desk kept her from seeing the fat, drooling head currently poking up toward his front legs. Her nostrils flared, and he caught the sound of sniffing coming from the clerk’s muzzle. The blush on Shining’s face intensified as he realized that, while his erection might not have been visible, his arousal was certainly detectable. His musk was fast spreading to fill around him, the scent of his swelling need tingeing the air with a thick, masculine scent.

It definitely did not help that the wide-eyed, pouting look on his little sister’s face was far too reminiscent of the sultry gaze Spitfire’s photo had given him from that magazine cover. Shining winced as his stallionhood gave another throb, and decided to take the easy way out.

“Fine,” he mumbled. “Just be quick about it.” He nodded up at the librarian, who gave him a neutral, yet somehow disapproving look in return. Twilight just cheered silently, pumped her hoof, and floated her library card back onto the desk. He didn’t even glance at the books she’d picked out; he just waited impatiently, and with a growing tremble in his knees, until she was finally ready to go.

On the way back, Twilight wouldn’t stop chattering—about her books, about her classmates, about what she’d had for lunch. Shining just smiled hollowly, nodding along whenever she said his name. He felt like a bad big brother for doing that, but he would have felt like a worse big brother if he’d voiced his real thoughts.

One or two ponies gave him an odd look on the way, but he finally stumbled, thankfully, into the house and onto his own bed. Shining gave a soft, high-pitched moan as his cock squished between his quilt and belly. It’d been drooling all the way back, and his balls felt fuller than ever.

His hooves trembling slightly, Shining pushed himself up into a sitting position and shut his bedroom door. His hoof slid across his fat, musky nuts, a thin sheen of pre and sweat glinting off of their surfaces. A twitch of his muscles made squeeze them; unable to help himself, Shining stroked and kneaded his delightfully warm balls, his musky covering lubricating his hooves nicely.

He whimpered slightly when he realized that he wasn’t going to be able to get off like this. He could feel the pressure building, and yet somehow, he knew that it would come to nothing. Rocking back and forth, he kept massaging his large, fuzzy sack, kneading his swollen orbs as his cock drooled a constant stream onto his lap.

Finally, his hips bucked with the force of orgasm—only no orgasm came. No sweet release took Shining in its arms; not a drop of cum dripped down his tip. Still whimpering softly, Shining closed his eyes and tried to sink into the headboard of his bed.

He hadn’t cum in more than a day, now. His testes still felt ripe, and full—and even his softening member still felt harder than it had before. Thicker, too.

Even as his testes throbbed in time with his heartbeat, Shining felt an image flicker back into his thoughts. Twilight’s wide, innocent eyes stared back at him, blinking cutely, a bright, cherry-red blush spreading across her cheeks as she looked down between his legs and saw—

No.

Shining’s heart thudded in his chest. He brushed his mane out of his eyes; it was damp, clotted, stuck together with sweat. He resolved to take a shower. Maybe that’d help.

He knew it wouldn’t.

Chapter Three

At least he was able to study.

Sort of. Shining had spent the next few hours after they’d gotten back from the library sitting at his desk and staring at an open textbook. At first, he’d celebrated finally having some time to himself, but the productivity of his session turned out to be...disappointing. Truth be told, as much as he’d glued his eyes to the page, scarcely a word of information passed through his skull. He was too distracted, too horny, too pent-up to do anything more.

His cock now refused to slip back entirely into its sheath; instead, it sat at a permanent half-mast, dribbling a thin stream of precum down its shaft. Once every few minutes, Shining was forced to grab a tissue and clean himself off. He wasn’t hard enough to masturbate, but he was more than horny enough that he wished he could.

It was torture. His balls sat in his lap, plump and heavy. Their warmth radiated into his thighs, causing his muscles to tense and contract instinctively. Shining’s thoughts were so disordered that he scarcely noticed when his half-hard member throbbed, splattering a fat glob of precum onto the pages of his textbook. He only noticed it when he tried to turn back a page and noticed that the paper was stuck together. His nostrils twitched with the musk of his own scent. Tears beading at his eyes, Shining just gritted his teeth, glaring at the page in the textbook before surprising himself by just ripping it out.

It bounced into the waste basket, a crown atop a small mountain of used tissues. For all his efforts, Shining’s lap was getting increasingly sticky, the drool from his unanswered libido matting his fur more and more every second.

He didn’t even notice when it had, but at some point during the evening, Shining’s hoof had slipped down between his legs to rest gently on his thigh. As he scanned across a paragraph on pegasus anatomy, his eyes firmly glazed over, Shining’s hoof twitched toward his crotch.

He jumped, the gentle brush of his hoof against his stallionhood sending a jolt of electricity through his body. Shining winced, his fat, swollen orbs throbbing with fullness. His hoof, unable to help itself, pushed a bit more firmly against them. He watched in awe as his massive nuts, each one nearly twice the size as they’d been just days ago, squished gently beneath his touch.

He swallowed, a hard lump in his throat. Trembling, he continued to caress his nutsack lightly. At this size, there was no way anypony could fail to notice his arousal. He certainly couldn’t.

He gave his balls another squeeze. Shining’s back arched, his teeth biting down hard to prevent the yelp that would have otherwise escaped. His limp cock throbbed reflexively. He could actually feel the seed churning in his fat nuts, could feel how full they were. Oh, how he longed to empty them. To spill that seed, to cum all over his room—or perhaps, he thought, in somepony else. He was thinking of Cadance, he knew, but somewhere inside of him, he knew he was longing for Twilight.

Before he knew it, Shining’s whole lap and stomach were covered in his warm, drooling pre. With a start, Shining reached for a tissue and did his best to dab it all up. It took some doing, but he finally managed to get most of the matting out.

Somewhat shakily, he pushed away from his desk and got to his hooves. He needed to take his mind off of things. Needed to clear his head. Maybe he’d get something to drink downstairs. Yeah. That was a good idea.

It was only when he was coming out of the kitchen, a cool glass of water floating beside him, that he heard her.

“Shiny! Will you read me a bedtime story?”

Shining froze. Slowly, barely daring to move any other muscle, he turned and looked down.

Twilight was beaming up at him. A pile of books was floating at her side. Suddenly feeling very self-conscious, Shining took a step back away from her. When he felt his half-hard erection—no longer so soft at the sight of his sister, damn it—slap against his thigh, he physically flinched.

“Sorry, Twily,” he said, grinning awkwardly. “I’ve still got to study.”

“But you’ve been studying all day.”

“Not true,” he pointed out. “I did take you to the library.”

“Yeah!” Twilight brightened. “And got some great books. I want to read one of them with you!” The pile floated a bit higher toward Shining’s muzzle; with a flicker of his own magic, he telekinetically nudged them back down.

“Look, Twi,” Shining said. “I’m just too busy right now.”

“Oh, come on, Shining.” Dad’s voice rang out in the hall. Shining glanced up and saw his father smirking at him from the foot of the stairs. “Mom usually handles this kind of thing, but she won’t be back till late. Besides, it’s a school night—you shouldn’t be up too late anyway.”

“So?” Shining asked, somewhat lamely.

Dad’s eyebrows knitted together. “So,” he said, “I just think it’d be nice if you did something for your sister. I know she’d love to spend some quality bonding time with you.”

“Oh, yes,” Twilight said. “Oh, please.”

Shining winced again at the mention of “bonding.” Deep within his gut, a beast reared its terrible head at the word, images invading his mind of just what kind of sibling “bonding” it had in mind—and what he, he was growing to fear, would enjoy just about more than anything else.

There she is, the beast whispered into his ear. Look at her plump little flank. Her wide smile. She’d do anything for her big brother. Even help him cum…

Shining shook his head, his ears slapping against the sides of his skull. “I don’t…” he began. But one look at his dad’s unamused look stopped him in his tracks. Shining gulped. “I mean, sure. You got it.”

“Hooray!” Twilight leapt for joy. She nuzzled against his leg—sending him stiffening once again—and prodded his side with a book. “I’ve already got one picked out.”

“Okay,” Shining mumbled. He felt more shell-shocked than anything else. Out of the corner of his eye, he saw Dad give an approving nod before trotting up the stairs. “Where do you want to do this?”

Do what? the beast purred. Shining shoved it back out of his mind.

“The living room’s fine,” Twilight said. Her cute little tail was swishing eagerly behind her. “On the couch?”

“Sure.” Shining’s lips were moving without his control, but that was okay because he didn’t feel in control anyway. He felt like a prisoner in his own body, locked into a set of desires and confusions that he barely understood. Walking as stiffly as a ponnequin, he trotted over to the couch and plopped down onto the far-left cushion.

Too late, he realized that he still had a half a stiffy poking up between his legs. Too late, he realized that his balls, ripe and full, were big enough to actually push his legs apart. Too late, he realized that his cock, far from settling down, was drooling more precum than ever in its effort to get his attention.

Almost too late, he saw Twilight galloping up to the couch—and toward him, specifically. Almost too late, he saw her leap into the air—with his lap as her clear destination.

Only the pillow beside him saved him. With a crack of magic faster than a whip, Shining yanked the pillow out from under his arm and pulled it in front of him. Twilight plopped right onto his lap—and then the pillow slid smoothly between their torsos, pinning his engorged shaft to his belly and pushing her forward just enough so that she wasn’t directly over his nutsack.

Shining’s heart was beating as fast as though he’d just run a marathon, but the look on Twilight’s face told him that he wasn’t about to get any respite anytime soon.

“I thought we’d read this one,” Twilight said, matter-of-factly. She levitated one of the books—one of the thinner ones, surprisingly—up into Shining’s field of vision. He eyed it suspiciously, grateful for the distraction from the pressure over his organ.

“The Pink Rose?” he asked. “Twi, I didn’t know you liked...uh, romance novels?”

Twilight turned up her nose. “I’m allowed to sample other genres,” she said, sniffing. “Mom said I should.”

Shining chuckled, a bit awkwardly. “Sure, kiddo,” he mumbled.

He made to open to the first page, but Twilight stopped him. “We were on Chapter Seven,” she informed him. “The top of page sixty-nine.”

Shining’s libidinous mind didn’t miss the potential innuendo there. His nostrils flaring slightly, he flipped to the correct page, snuggled back against the couch pillows, and settled in to read.

“Chapter Seven,” he read aloud. “In the Garden.”

As he read, Twilight snuggled up against his chest—or at least tried to. She wound up snuggling against the pillow instead, and for that, Shining was grateful. At first, he was grateful for the book, too; maybe this would be the thing to finally take his mind off of his buildup. As he read on, though, it became clear that this book was anything but helpful.

“‘Oh, Midnight’,” Shining read. “‘Take me now, and I will be yours forever.’” Who wrote this stuff? “‘I shall, Eclipse,’ her suitor replied. His hoof curled around her barrel, pulling her a few inches closer. She turned to face him, her lips slightly parted—”

Shining cut off there. His cheeks flushing brightly, he glanced down at Twilight. “Are you sure it’s okay for you to be reading this kind of stuff? You’re awfully, uh, young for it.” Not to mention it’s way beneath your usual standards, he added silently.

“Yeah? Well, Mom said it was okay,” Twilight said. She chewed on her lip. “Can we just finish reading, please?”

Shining sighed, then picked back up where he’d left off. Unfortunately, as he read on, his thoughts drifted once more, his lips going on autopilot as his mind wandered elsewhere.

Oh, Celestia, but Twilight was sitting on his lap. He could feel her delicate filly legs resting atop his. The softness of her fur as it brushed against his own was doing nothing to help his growing arousal; her sweet, innocent scent filled his lungs with every breath. Soon, his erection was fully hard, and throbbing with a deep, primal need.

Shining shifted his flanks on the couch cushions—and nearly moaned as his member rubbed against the pillow’s surface. His erection had been drooling constantly for the past—five? ten?—minutes, and the rough fabric was now slick and hot with his lust. His motion set Twilight moving too, cuddling closer against the pillow to get comfortable again. As her fur slid across his, he felt his cock throb powerfully. It almost felt like she was grinding against the bulge in the pillow’s body, her tiny body playing with him, squeezing him, pressing his length against his pre-matted stomach.

He paused at the end of the next paragraph. He had to actually bite down on his lip to prevent a whimper from escaping. His cock was steadily drooling pre down his belly, and his balls felt fuller than ever. To top it all off, Twilight was still on top of him. Twilight was—

Shining swallowed, and started up reading again. The pillow had slipped up a bit sometime over the last page, leaving a full five inches of his torso exposed. Whether Twilight had pushed back against it, or the throbs of his own shaft had pushed it up, he didn’t know. Whatever the reason, Twilight had scooted back with it—and the back of her flank was now pressed tenderly against his front.

Her flank. Her flank. Her rear was pushed lightly against the front of his bulging shaft; in girth, he was easily a third as wide as her entire rump. Shining had to stifle another moan as Twilight shifted her flanks against him. Her tight little cheeks seemed to embrace his base, wrapping around it. As she slid against his girth, he nearly moaned. His shaft was so slick with pre that he’d matted Twilight’s rear with it, letting her tight filly rump all but glide across his lap.

With a start, Shining realized that he could feel...something else against his thigh. Twilight had shifted positions again. Now, both her legs were straddling his thigh, her head resting in her forehooves as her front elbows leaned on his lap. He could feel her rubbing against his leg—her, her most intimate parts, that small ripple of skin gliding gently against his coat. Oh, Celestia, but it was driving him mad.

He couldn’t keep himself from imagining it. What would they look like? Those small, soft filly lips. Barely parting—for why would they? They’d never been pushed past, never been used. He could be her first.

The image flickered into his thoughts. Twilight was presenting to him, teasing him. He imagined her lifting her supple rear into the air, letting her winking marehood stare back up at him. He imagined her wiggling her cute little rump, egging him on, asking why her “big brother, best friend forever” was being so slow, so hesitant when all she wanted was for him to feel good. Oh, how he wanted to feel good.

His muzzle trembled. Unbidden, more images came to his mind. He pictured himself mounting her, pinning the tiny filly beneath his weight as his comparatively massive shaft prodded against her rear. Then again, that voice whispered, she was already in the perfect position.

How easy it would be, that beast in his gut whispered, to jiggle her up a few inches. To slip his fat cock through the gap beneath the pillow. To feel her cheeks wrapping around him, teasing him further as his hefty orbs released more and more precum, basting her rear with his lust. To tease against her, to slip inside her, stretching her virginal walls tight around his member. To feel her bouncing up and down atop his lap as he fucked her, her big brother, on a night and at a time when nopony would be watching.

To feel that pressure building again, to actually go over that edge again, to cum inside her tight filly’s womb, to finally find release in his sister’s flower as the juices of her life’s first orgasm streamed down his thick, veined shaft—

“We’re going to have to finish there,” Shining blurted out suddenly. The magic around his hoof flickered out and died; the book flopped to the floor. He lifted a hoof to his forehead and felt it burning. He wiped away a hooffull of sweat; in fact, his whole body felt sweaty. As his hoof came away, he saw it shaking. Trembling with strain—or perhaps, with fear.

“But—”

He cut Twilight off. He didn’t have the time for this. He couldn’t let this go any further. He pushed her off—he meant to nudge her, really, but it came off as more of a shove—and winced when she let out a yelp. At least she landed on her hooves.

“Sorry,” he said quickly. He jumped off of the couch as quickly as he could, holding the pillow over his crotch until the last possible second. The sudden loss of Twilight’s fillyhood teasing his thigh didn’t help his situation at all—if anything, it only drove his libido madder with lost, with lust, for a need for what it couldn’t possibly have. “Really. We’ll, uh, finish some other time.”

There was an odd look in Twilight’s eyes. Still, her cheeks were red and puffy. “But you said you’d finish reading it with me!” she wailed, pouting.

“Sorry, Twily,” Shining said. He felt his cock throb again beneath him, and realized that he’d been steadily drooling onto the carpet. A puddle full of several tablespoons of his pre had pooled beneath him; his balls felt fuller and plumper than ever. They hung between his legs, the size of oranges by now, only barely hidden by his tail and surely visible to Twilight’s ground-level view. “Really. Some other night.”

With Twilight watching after him, crestfallen, Shining all but galloped away. He let the stairs groan beneath him, heard the floorboards creak as his hooves thundered across the second floor. Only when he reached his room did he relax, the door slamming shut behind him as he collapsed onto his bed.

His chest heaving, Shining stared helplessly up at the blank white of his bedroom ceiling. Above him, seeming to dominate his vision, his erection stood tall. A river of milky-white ran down its side, his thick, black cock still throbbing in time with his heartbeat. It seemed to tower above him, a monolith, a tower, a raging beast beating with every pump of new blood through his veins.

Panting, whimpering, his forehead still slick with sweat, Shining felt his eyes slowly flutter shut. It was going to be a long night.

Chapter Four

Shining Armor was exhausted.

The weekend had finally ended, leaving him ripe and ready for the beginning of the school week to sink its teeth into him. Mondays were already the bane of any colt’s existence, but on top of that, Shining Armor had barely slept a wink the night before, too tense to ignore the churning, swelling nuts weighing heavily against his thighs.

They were even larger than oranges, now, and seemed to weigh more than a pound each. Each smack of those plump, weighty orbs against his legs or mattress sent an electric shock shooting up his spine—and a splurt of precum shooting from his flare. They’d gotten so big, stretched out by Shining’s cum production seemingly going into overdrive with every day that he failed to find release. A more lucid Shining might have guessed that every time he tried to rub on out, it only made the problem worse, adding his last orgasm’s cum to the future stores his grapefruit-sized orbs would grow to contain. But an even more lucid Shining would have known that it made no difference. He needed to cum, needed to find release more than anything he’d ever known.

Pent-up, tired, and frustrated at everything, Shining found that his morning was already going terribly. Unfortunately for him, it didn’t stop getting worse.

“Okay, everypony,” Miss Glimmerwing announced. “Put away your books and take out your quills. It’s time for the exam.”

The exam—the exam! Shining’s eyes shot wide open. Oh, Celestia. For all his time spent studying over the weekend, he found that he couldn’t recall even a single paragraph. Instead, the constant throbbing of his cock kept his thoughts spinning in circles, blanking out even the simplest academic knowledge.

As the teacher went around passing out exams, Shining realized that the filly next to him was staring at him—or, more specifically, at his crotch. Shining blanched when he realized where her gaze was directed. He hadn’t been soft in over twelve hours, now; his erection, far from going down, had stayed absolutely, completely hard, constantly needling him for attention. At one point, his tail at least had been able to cover his “needs” while he was walking. Sitting here in class, though, he was completely exposed.

Shining swallowed. Hearing a gasp, he glanced quickly over to the other side. Another colt—what was his name, again? Trend-something?—was staring at Shining’s massive erection with wide eyes and a hefty blush. At that exact moment, Shining’s balls throbbed between his legs. They were fat enough now that he had to keep his legs spread apart on his chair, and he knew exactly how visible they were to anypony nearby. It didn’t help, either, that the small river of precum constantly streaming down his shaft made his member slick and shiny with arousal, or that his stallion’s musk was rapidly spreading to highlight his lust for anypony within four yards of him.

Shining’s cheeks flushed. Hurriedly, he scooted himself a bit further under the table. His fat, puffy flare slid across the underside of his desk, slicking it with pre. He grit his teeth when he felt his stallionhood shoot out another glob of pre at the additional stimulation. It splattered against the table loudly, a fat gob of pre that left no mysteries as to the depth of his arousal.

By the time Shining’s teacher had made her way over, both of the other students had redirected their attention to their own desks. As Miss Glimmerwing set the exam onto his desk, Shining crossed his legs and fanned his tail out below him. He dearly hoped that she wouldn’t see the spreading puddle of pre below him, or smell the hefty plea for sex that his musk all but screamed for. Thankfully, she barely even glanced at him, though her nostrils did flare a bit at his scent.

As she walked away, Shining could almost swear that she was swaying her hips back toward him. He blinked, and the illusion vanished. A hard lump rose up in his throat. He had to clear his head, had to ignore his erection. He couldn’t go on like this. He needed to focus.

With a start, he realized that the rest of the class had already begun writing. Somewhat guiltily, Shining picked up his quill in his magic, dipped it into his ink bottle, and turned his exam over.

The first question. Right. He stared at it for a moment. Something about cell development. When he glanced back up at the clock, he realized that he’d been staring blankly at the page for nearly five minutes.

It was impossible to focus. The words blurred on the page, dancing, mocking him in their freedom. His eyes glazed over the page; each time he began to process a question, a throb from his cock, or the sloshing of his heavy balls, would instantly pull him out of it. His breath would shorten, his gut would clench, and his whole world would compact into that pillar of meat standing proudly at his crotch.

Even the white—the creamy, simple white—of the paper set him off. He found himself lost in a reverie, imagining stripes of that thick white overlaying a mare’s flank. Dripping from Cadance’s muzzle. Leaking, drooling from the wide-stretched petals of Twilight’s once-virgin fillyhood.

Shining swallowed again. His cock lurched beneath the table again. The pressure inside of his balls was unbearable. He was twitching, sweating; his hoof was trembling, even flinching with each new throb of his shaft. As the rate of pre pouring from his aching member redoubled, Shining’s horn glimmered. Unconsciously, helpless in the face of his baser desires, his magic began to caress, to stroke, to squeeze his organ as it begged for attention.

Somewhere in the back of his mind, he registered the disgust on the face of the filly beside him. She could see his bright blue magic wrapped around his tool, fondling it, stroking it up and down. But Shining didn’t care. His lip trembled, his thighs flexing as he slipped into self-pleasure. He needed this: needed to jerk himself off, to find release. But it wasn’t enough.

It was never enough.

After an eternity, the bell finally rang. Shining sat, glassy-eyed, shaking slightly, as the teacher went around to collect their tests. He’d filled out barely a third of the answers. Somehow, though, the reality of that seemed so far away.

The second the teacher’s magic scooped up the papers from his desk, Shining was gone. He darted from the classroom, panting, his member smacking wetly against his belly. He didn’t know where he was going, but he knew that he had to get somewhere alone—somewhere where he could take care of himself properly, and who cared if it would do no good? Who cared if it would just make everything worse? He needed—he needed—he needed—

Twilight.

He blinked. Was that—

But no. She was too tall; her coat, not nearly purple, was pink instead. A soft, welcoming pink. The candy-color streaks in her mane, while reminiscent of Twilight’s, were pink and yellow. And she was too tall, too old, too—beautiful.

His mouth went dry.

“Shiny!” Cadance beamed at him. Shining twitched; he couldn’t go around her. The crowd in the hall was too thick, and she was all but barring his way. “How was your weekend?”

“My—my weekend?” Shining stammered. Below him, he felt his cock lurch against his belly. A fat puddle of pre was already beginning to spread across the floor beneath him. His tail swished behind his hocks. With a dawning sense of horror, Shining realized that his balls were officially too big, too round, too full to be covered up. His legs were set wider apart, forcing him into an almost waddling gait. A muscle twitched in his thighs, forcing his hind legs back together and squeezing his plump, cum-laden orbs between them for a moment. Shining stifled a moan, and another glob of pre spattered noisily against the floor.

Oh, Celestia. Everyone could see him. Everyone could see his arousal—could see how pent-up, how fucking huge his nuts were. Oh, gosh, but the mess he was making everywhere—the lakes and rivers of precum he’d been dribbling all over the school. Oh, Celestia, but Cadance was going to notice, and she was going to ask, and she was going to make him tell her what was wrong—

She was still staring at him, he realized. And she hadn’t even glanced down, hadn’t seen the fat, black flare throbbing between his legs. Forcing a smile onto his face, Shining chuckled uneasily and took a step forward.

“Oh, it was—good,” he said. “Lots of, uh, studying.”

“Studying, huh?” Cadance’s eyes lit up. “Oh, for the biology test? How do you think you did?”

“O-okay.” Shining’s front knees were starting to knock together. The drool of pre from his tip had doubled again. He had to bit down on his lip to keep from groaning. The tightness in his nuts almost hurt—but, at the same time, he longed to massage them, to squeeze them, to caress them. He wanted to feel the cupfuls of seed sloshing around inside of their cum-laden depths. He wanted to let the pre spurt against his chest, wanted to cradle his aching balls, wanted to imagine releasing their enormous load inside of Twilight’s—a mare’s tight, warm cunny.

“...So,” Cadance finally said. She grinned lamely at him. “Did you want to maybe hang out later? We can go to the library and try to get some homework done together. Or go to that new cremerie downtown.”

Shining gave her a nervous smile. “I’d love to, really,” he said. “I just, uh, have other things to take care of.” He didn’t want her to see him like this. She couldn’t know—he couldn’t let her find out what he was thinking, what he wanted to do.

Oh, Celestia, what did he want to do?

“Oh.” Cadance’s smile faded a bit. “Sure. Maybe tomorrow, then?”

“Maybe,” Shining blurted. The pressure in his balls was swelling to a peak. He could actually feel the skin around his nutsack tightening, stretching as more and more jizz filled his sore, overstuffed nuts. “I—look. I gotta go.”

“Oh,” Cadance said. “Sure. Just...let me know, okay?”

“Got it.” Shining’s hooves were tapping frenetically. He needed to escape, badly. “Right.”

Cadance brightened. “Oh! And if we wind up doing anything, you can bring Twilight. I’m sure she’d love to try some of their ice cream.”

The image came, not entirely unbidden, into Shining’s mind’s eye: her muzzle, white and splattered with cream. But was it a sweet dessert...or was it his cream that she’d just been eagerly guzzling down?

Shining froze. His heart feeling like it was trying to leap up his throat and choke him, he lowered his head and shook it vigorously. “No!” he blurted. His balls were swelling even further; he felt like they were going to blow. And why wouldn’t that image of Twilight leave his head: Twilight, her cute filly cheeks puffing out around his cock, the sound of her steady gulps music to his ears as she swallowed cupful after cupful of his cum, her small filly’s tummy steadily swelling out with his seed…

He couldn’t take it anymore. Without another word, he galloped down the hall, rudely pushing Cadance aside with his shoulder. The last thing he saw of her was her wide-eyed, shocked expression—and then he was blurring down the corridor, his mane whipping behind him. Panting, searching desperately, he finally found what he was looking for: the colts’ room.

Shining burst into the bathroom, sending a lanky colt spinning in his wake. He crashed into a stall and slammed it shut behind him with his magic a fraction of a second later. Gasping, he propped one foreleg against the wall and leaned his weight against it. Once he’d angled his huge, throbbing member over the toilet, he took his other hoof and went to town.

His every breath felt like it shook his body. Shining’s lungs heaved, his whole torso trembling with the strain of the pressure he felt in his nuts. And just like that, something broke.

Shining Armor gave up.

Images of Twilight flooded his mind. Jerking him off, sucking him off, playing with him, teasing him. He imagined slipping inside of her while reading to her, and a sickly grin crossed his face. He imagined pinning her to the carpet and fucking her while she cried out and groaned in absolute pleasure. He imagined stretching her wide around his cock, plunging his girth in and out of her as she begged for more.

Shining’s hoof sped up and down his shaft, stroking it firmly as his magic teased and plumped his balls until they felt ready to explode. He was still panting, even as glob after glob of pre drooled from his hefty flare, spilling down into the toilet.

He couldn’t deny anymore—he wanted, needed to rut Twilight. To make his little sister his mare. To spear her on his cock, to fill her up with his spunk, to watch her belly bloat around his length as her womb filled up with every drop of his hot, churning seed.

Shining bit down on his lip so hard that he actually broke the skin. He couldn’t help it; after being suppressed for so long, every one of his depraved thoughts were flooding back into his mind, driven entirely by the roaring force of his bestial libido. He could see them now: her cute filly lips, winking slightly, dripping with her honey as she welcomed him inside. He could see her cheeks bulging around his cock, his hoof sliding gently down her neck as he pumped his girth all the way back to her throat. He could see his flare bulging, stretching her neck as he pumped an impossible amount of cum down straight into her belly.

He felt it again: that familiar feeling of tightness and pressure building in his loins. By now, he’d grown to dread it almost as much as he loved it. Maybe this would be the time when he finally came, he told himself. He knew what he wanted—didn’t he? He wanted Twilight. He wanted Twilight, in a way that any stallion wanted a mare. And as he felt his balls churning, swelling, producing more and more cum to deposit into Twilight’s perky little butt, he knew that he would finally find release.

Except he didn’t.

Shining Armor collapsed against the wall. Only the sudden jerk of his hoof stopped him from slamming into the toilet seat. His chest heaving, and sweat dripping down his chest and chin, Shining watched with a dull horror as his hips bucked—only to release a huge glob of milky-white pre into the bowl. Not a drip of cum escaped his tip, though his fat flare throbbed for it.

He slowly slid down until he was squatting on his haunches. His member bobbed out before him, still drooling pre onto the growing puddle on the floor. He’d actually made the toilet bowl come close to overflowing, and yet he felt no closer to the satisfaction he’d so craved. Shining actually whimpered, feeling his balls fill up bigger and plumper and heavier.

Where would it end? he wondered. When they draped down halfway to his knees? When the slightest touch would send him careening with the force of an almost-orgasm? When he could barely sleep or eat or breathe, too consumed by the sloshing, the roaring, the never-ending churning of his overstuffed nuts to even think? When they were big enough to drag along the ground? When they were too big for him to walk? When they were so big that his tortured, stretched nutsack just finally gave up and burst?

And then, just like that, Shining Armor knew the nature of his curse.

He blinked slowly, his eyes glassy as the thoughts stirred in his mind. Like a pool in the wake of a ripple, his thoughts suddenly stilled, focused only on one idea. It surged up into his skull, grabbing every available process and forcing them into a single, distilled thread.

It can make a stallion do anything you want.

A stallion.

Anything you want.

Make him do it.

It can do it.

The spell.

Shining’s lips curled. He felt like laughing, and he felt like crying. Of course. Twilight’s spell had done this. Her teacher’s “special book?” He had a fair idea of what that was now. Not that it made much difference, now that he’d been pushed past his limits.

His chest slowly rose and fell. Shining suddenly knew one thing, and one thing alone: He had to get Twilight to lift the spell. To cancel it, to summon up a counterspell, anything. But to get her to do so…

Shining almost gave a bark of laughter. She wanted to know about “the Talk?”

He’d tell her. He’d show her. He’d make sure she’d enjoy it, thoroughly. And he’d finally be able to enjoy his release. She would be willing to help him, he knew. He was sure of it. He would ask her—beg her, if necessary. She was his little sister—she loved him. And he loved her. He loved her more than anything.

By the end of this, he would make sure that she knew that.

Chapter Five

Shining Armor stood in front of his sister’s door, his hoof poised to knock.

On another day, at another time, he might have asked himself: Was he really about to do this? He already knew the answer, though. The fat, heavy weight hanging between his legs knew it for him.

He swallowed, then knocked three times. “Twily?” he called out. He was proud that his voice didn’t shake. “You in there?”

“Who is it?” Shining’s shoulders slumped at her reply. Oh, thank goodness.

“Shining!” A weak grin crossed his face. “Your B.B.B.F.F.?”

There wasn’t even a hesitation. “Come in!”

The door swung open before him, and he stepped gratefully through. His hooves padded on the carpet as he made his way into his little sister’s room, stepping off of the hard, polished wood of the hallway outside. In here, the walls were lined with posters of famous unicorns, bookshelves groaning with textbooks and storybooks alike, and stuffed animals, too. Twilight was still a filly, after all.

Once Shining was fully inside, he closed the door behind him with his magic. It clicked shut, almost silently. He needed this to be quiet. Mom and Dad were downstairs, and if they heard the wrong thing—

But all of this was the wrong thing, he knew. So long as he finished tonight with the release he needed...everything would be alright. The monster between his legs throbbed, and he winced.

Twilight was lying on her bed, flopped back on a frilly pink pillow almost twice her entire size. She had a book cradled in her lap—a Daring Do book, Shining noted from the title. When the door closed behind him, her eyes flicked up expectantly.

“What’s up?” she asked. Shining’s heart fluttered in his chest. That cute, innocent filly’s voice—it twisted something inside of him, made his veins thrum with need and want. Steeling his nerves, he licked his lips and stood a little straighter.

“Well,” he said, a strained grin on his face. “If I recall correctly, there’s something that we never quite finished discussing on Friday.”

“What’s that?” Twilight’s big eyes blinked up at him. They were incredibly adorable—and, to Shining’s libido in overdrive, equally alluring.

His grin widened. “You wanted to know what ‘The Talk’ was, right?” he said. “I can do even better than tell you. I can show you.”

Twilight’s eyes widened. Her mouth formed a small, cute ‘o’. “Really?” she said. “You’d do that! You’d—”

Shining’s magic caught her just as she jumped off the bed. “Yes,” he hissed. “I will. On three conditions.”

Twilight bobbed her head.

“First,” Shining said. “You’ve got to be quieter than that.” Twilight mimed zipping her muzzle shut, and Shining chuckled. “Second, you do not tell Mom or Dad anything about what I’m about to tell you, or that I’ve told you at all.” He waited for Twilight to nod before continuing. “Finally...”

He was suddenly very aware of the weight of the balls swaying between his hind legs. He was made equally aware of the way his engorged cock was throbbing with his heartbeat, and the puddle of dripping pre that was rapidly staining Twilight’s carpet. The glint of magic around Twilight’s body whispered to him. She’s under your power completely, it said. You could do anything.

And he would. Shining gulped. He just needed this taken care of first.

“And second…” Shining drew in a deep breath as he floated Twilight down to the carpet. “I need you to remove that spell you cast on me.”

“That spell?” Twilight’s brow furrowed. “What spell?”

“The one you used when I didn’t tell you,” Shining said. Oh, Celestia, she had to know what spell. “The one that was supposed to make a stallion do ‘whatever you want’.”

“Oh!” Twilight said. “That spell! So it worked after all!”

“Yeah, yeah,” Shining said. “But I need you to remove it. You do have a counterspell, right?”

“Oh! Yup.” Twilight paused. Her eyes narrowed shrewdly. “Wait a minute. How do I know you’ll still tell me if I took it off?”

A fat glob of pre launched from Shining’s cock and splattered all over the carpet. He grinned awkwardly. “Trust me. I will. Just...” His grin wavered. “Please.”

“Okay…” Twilight frowned. She was quiet for a moment. Then, she squeezed her eyes shut and screwed up her muzzle. Her horn flared a bright pink—and then flashed. At first, he didn’t feel anything. But then...

It felt like an egg breaking over Shining’s neck. Its warmth seemed to ooze down his neck in tendrils, caressing his shoulder blades before moving down to his back and haunches. Shining almost moaned as all of the tension went out of his body; he hadn’t realized how tense he’d been. He felt the warmth of Twilight’s magic curl down around his legs, shrouding his stallionhood. His balls pulsed hungrily. Then...the feeling was gone.

Shining drew a long, ragged breath. He didn’t...think he felt any different. He swayed a bit, then winced when he felt his balls smacking against his thighs. Still plump, and still tender. Right.

But all the same...somehow, he knew that the spell had been lifted.

“Okay, then,” he said, exhaling. He shot Twilight a smile. “Now, I’m going to teach you all about it, okay? A promise is a promise, after all.” He didn’t say that it was a promise he’d made to himself.

“Yay!” Twilight cheered. Then, as if remembering her promise to be quiet, she slapped a hoof to her muzzle. Smiling sheepishly, she said, “I mean, yay.”

Shining chuckled. “All right,” he said. “I’m going to need you to back onto your bed, then. On your back.”

Twilight nodded, and hopped up onto her mattress. Once she was on her back, she looked at him expectantly. “Now what?”

“Now,” Shining said. He grunted and heaved himself up after her. “I come up with you.”

Part of his mind—the innocent, brotherly colt—voiced its final, desperate objections. The spell was lifted, it said. He didn’t have to do this. He could just give Twilight a half-assed answer, then go jerk off in his room. He didn’t have to take his little sister’s innocence.

But the stallion in him—the aggressive, pent-up stallion—crushed that objection without a qualm. He’d long since made up his mind on this. He wanted Twilight’s fillyhood more than anything he ever had before. He needed it in a way that he could scarcely describe. This was no spell anymore, he thought, his cock slapping against his belly as he heaved himself onto her mattress. This was what he knew he wanted.

He eased himself back onto his haunches, the mattress sinking beneath his weight. He was easily twice Twilight’s size and weight, and her bed was more used to holding up a young filly than a colt on the verge of stallionhood.

His cock, thick and tall and covered in precum, slapped wetly against his belly. Shining licked his lips, watching Twilight’s gaze anxiously as he did his best to present himself in front of her.

Her eyes just widened. “Your thingie!” Twilight gasped. “It’s all big and wet!”

“Yes, it is.” Shining mentally sighed. No freakout yet. “Do you know what it’s called?”

She frowned. “Your...penis?”

There was about a fifty-percent chance she’d gotten that out of the anatomy section of his biology textbook. Ignoring the fact that this meant she’d been sneaking into his room and stealing his schoolbooks, Shining just grinned down at her. “Yup. Though you can also call it my ‘cock’.”

“Cock.” Twilight tasted the word. She seemed to like the sound. “Does it have something to do with the Talk?”

“Oh, it has everything to do with it,” Shining said. “You see, Twilight, when a stallion loves a mare very much, they have sex.”

“Sex.” Twilight blinked. “Like for reproduction?”

“Something like that,” he said. “But also because it feels good. What happens is that the stallion puts his penis—his cock—inside of the mare’s vagina, or marehood. ”

“Vagina,” Twilight said. “Oh, wait! I have one of those.”

“So you do,” Shining said, grinning. “Though that isn’t the only way to have sex. Just touching a stallion’s cock, or a mare’s vagina can make them feel good.”

Twilight suddenly gasped. “Wait,” she said, squinting adorably. “You said that ponies have...sex when they love each other very much. When a stallion loves a mare very much.”

“That’s right.”

“Like you love me?”

Twilight looked up at him, her big, innocent eyes blinking invitingly. Shining felt a shiver go down his spine. He didn’t waste a beat in replying, “Yes, Twilight. Just like I love you.” He felt his hoof twitching in her direction and just went with it. As he smiled down at her, he rubbed her shoulder comfortingly. Her fur was soft and warm beneath his touch, and she giggled softly at the contact.

“Well, then,” Twilight said, in her most matter-of-fact tone. “Since I love you too...does that mean that I can help you feel good, too?”

That was just what Shining had wanted to hear. His smile widening, he patted Twilight on the head and said, “Of course you can, Twily. I’d love it if you did.”

Twilight beamed. “Okay!” His cock throbbed again, and her eyes were drawn to it like a magnet. Shining saw a fat bead of precum beading at his flare; the rest of his shaft was already streaked with his pre, but Twilight seemed to be staring specifically at this drop.

She tilted her head. “Can I...touch it?” she asked. Of course. Show Twilight Sparkle something new, and she’d want to learn all about it—even if that meant having a hooves-on experience. Shining could barely stand the anticipation.

“Go ahead,” he said, and held his breath.

Twilight didn’t seem to hear him at first. Instead, she seemed entranced, mesmerized by his pillar of meat. She was actually swaying slightly, her head bobbing to the visible throbbing of his member. Slowly, almost experimentally, she reached out and placed one hoof on its side.

Shining’s thighs tensed reflexively. Twilight’s touch was the first physical contact he’d had with another pony in days—and the first time he’d ever had somepony touch him “down there.” He bit his lip, straining to hold in a moan. Twilight’s hoof, so tiny, so fragile next to his turgid stallionhood, traced slowly down his length. The bristling of her soft fur against his slick, smooth shaft set his nerve endings alight; Shining grunted, his eyelids fluttering, as his dick lurched. A fat glob of his pre splurted out and hit Twilight right on the cheek.

She let out an “eep!” of sudden fear and jerked back. Her hoof yanked away from his shaft. Her eyes widened, and her hoof flew up to her muzzle.

“It...shot stuff at me!” Twilight exclaimed. “Gooey stuff!” Her hooves went to her mouth. “Oh no! Did I hurt it?”

Shining chuckled. “That’s just my precum, Twily,” he said.

“Pre...cum?” Twilight said.

“Yup,” Shining said. “It means that I’m very aroused.” A blush touched his cheeks at Twilight’s befuddled expression. “Or, to put it simply, you made me feel good.”

Twilight blinked again. “Touching it made you feel good?” she asked. Shining saw her mentally note that down. He could almost see the gears grinding in her big, filly eyes. She wiped her hoof against her cheek. When she pulled it away, it was coated in what had to be a good tablespoon of Shining’s milky-white pre. She stared at it, then glanced back at Shining’s member. The friction of her hoof against its surface had left it swaying, bobbing genially in the air.

Shining nodded shyly. “It did. But the shaft is just one part of my stallionhood.” He nodded down at his flare. “There’s also the head, where the precum comes out. And the balls, which make it.” He pointed down at his swollen ballsack with a hoof. It was plump enough that, even with both his legs spread wide, his nuts still pushed against his thighs. Every time he flexed his hind leg’s muscles, however slightly, he could actually feel the unspent seed churning around inside of them. Small wonder a single touch of Twilight’s could induce that much of a response.

His muzzle twitched. Unspent seed. Well. Not unspent for much longer.

Twilight regarded them for a moment. “Balls,” she said. She nodded. “Does touching those feel good, too?” She leaned forward, her forehooves sinking into the quilt. Her perky filly flank stuck out a bit above her shoulders, waggling precariously in the air. Shining caught his eyes wandering toward her Cutie Marks, then quickly glanced back down at her face.

“It can,” he said. “You just need to—nnggh.”

Twilight’s hoof paused, just after it’d sunk a good quarter-inch into Shining’s fat left nut. Shining’s thighs flexed, his shaft swaying even harder as his crotch tensed at the contact. He groaned audibly. The sound of pleasure escaped him without even a second thought. The touch of Twilight’s hoof, barely wide enough to cover even a quarter of his cum-laden orb, was still more than enough to send pre-emptive endorphins shooting up his spine. He could feel his cupfuls of cum sloshing beneath her touch, and imagined every drop of his seed covering her face—or filling her tight, filly hole.

Twilight hesitated. “Did that...feel good too?” she said. “You’re just making these weird sounds. I don’t want to…”

“You’re...mmff. You’re not hurting me, Twily.” Shining bit the inside of his cheek. Twilight had begun to gently massage his ball, her two little hooves teasing and squeezing his swollen nut ever so gently. “Just...so long as you don’t press too hard.”

Twilight nodded to herself. “Okay,” she murmured. When she pulled back her hooves, Shining almost whimpered; her touch had felt like heaven, her soft fur better than his own hooves around his shaft. But Twilight was just getting started.

Planting herself down on her haunches, she scooted herself a bit closer. The blanket scrunched up beneath her legs, her tail trailing across the fabric. Once she was scant inches away from Shining, she rocked herself back, picked up both hooves, and placed them back on his shaft.

Her hooves traced down the sides, two tiny, soft circles attempting to appease a swollen giant. Shining licked his lips, watching Twilight’s hooves overrun with his precum.

She wrinkled her nose. “They’re getting all sticky.”

“That just means you’re doing a good job,” Shining reassured her. “Keep...mmff. Keep going.”

Twilight nodded. She squeezed a bit harder around Shining’s shaft and pulled it toward her chest. It went up past her muzzle, and smacked playfully against her nose when it lurched again. This time, Twilight giggled when Shining’s flare came away with a thread of precum still attached.

“It’s really warm,” she observed. Her little hooves kept moving up and down Shining’s base, just below the medial ring. Shining’s arms trembled a bit as his little sister jerked him off. “And it keeps...throbbing?”

An interested glint in her eye, she leaned forward again. Shining exhaled when he felt his sister’s muzzle brush against his flare. As her hooves encircled his shaft, she softly nuzzled his tip. The softness of her fur against his cock teased out another glob of pre. This time, it landed in her mane, matting her hair. Twilight didn’t even register it. She was too preoccupied with her new toy to pay attention.

Shining shuddered with pleasure. Twilight’s muzzle had booped against his flare a final time, and was now slowly moving down his shaft in parallel. Her hooves pushed up his thighs, then settled just against his belly. Twilight herself, meanwhile, buried her little muzzle in Shining’s fat ballsack. She nudged one orb with her nose, then twitched back reflexively when it pulsed in return.

“They smell weird,” Twilight announced. She scrunched up her muzzle adorably. “Like you, but...more.”

“That’s musk,” Shining told her. “It means I’m...uh, well, very turned on.” He hesitated. “You can...lick them if you want.”

“Lick them?” Twilight pulled back and stuck out her tongue. “Blegh. Mom says I’m not supposed to lick weird things.”

“Is it weird if it’s part of your brother?” Shining grinned down at her. “It’s just like a kiss.”

Twilight looked thoughtful. “I guess,” she said.

“You might even like the taste.” Shining quirked an eyebrow down at the pre-slick sheen covering his round, fat nuts. “Give it a try. Think of it as an experiment.”

If there was one thing that Twilight Sparkle could never resist, it was an experiment. She instantly sat up a little straighter, her eyes glimmering with the light of her filly’s intelligence. Bending down, she poked her tongue out of her muzzle and squeezed her eyes shut. Slowly, carefully, she licked across the surface of Shining’s ballsack.

Twilight paused and licked her lips. A bit of Shining’s pre had smeared across her mouth, and was now dripping down her chin. “It tastes kinda...salty?” she said. “Hm.”

Evidently, more experimentation was required. Twilight dove back down and actually latched onto one of Shining’s nuts. Her muzzle was pursed around it as she sucked on his plump balls, lightly kneading them with her tongue and lips. Shining groaned, another tremble overpowering his nerves as Twilight’s hooves went back to rubbing his shaft.

He was getting close. Oh, Celestia, but he was close. Shining grunted, his hooves sinking further into the mattress as he leaned his weight back. Twilight didn’t seem to notice his change in posture, still occupied with sucking at his pre-coated balls.

His little sister was jerking him off. She’d tasted his pre, and liked it. Shining shivered as the familiar pressure built up at the base of his shaft. The touch of her soft, filly lips to his ballsack was like heaven; each trace of her hooves around his girth just made it throb all the harder. His heart was beating in his chest like a drum—surely he would cum? He’d done his waiting. He had to cum—had to finally feel release. Sweat was rolling down Shining’s forehead. As Twilight explored him further, investigating every inch of his member, Shining felt that pressure building in his loins. He almost whimpered. He needed to reach the edge.

He coughed. “You know, Twilight,” he said, a blush rising to his cheeks. “You could try putting the top into your mouth. That might taste even better.”

Twilight’s lips came away from his ripe nuts with a liquid pop. She eyed his fat, bobbing member skeptically. It throbbed in time with Shining’s heartbeat, rivulets of his precum still streaming down the sides. “I dunno,” she finally said. “It seems pretty big.”

“Just give it a try,” Shining said. “You might like it.” Twilight nodded.

Cautiously, she raised her muzzle to the top of Shining’s flare. It was a bit too tall, so she had to bend it slightly toward her to reach. For a moment, Twilight was still. She stared across at his member, sizing it up. Then, she leaned forward and went for it.

Tingles danced along Shining’s skin as her lips made contact. Twilight’s mouth was already coated with saliva, and so the slickness of her skin against his pre-coated flare elicited another throb without much effort. Carefully, as if measuring each centimeter, Twilight’s opened her mouth. Bit by bit, her muzzle opened up over Shining’s flare. She used her hooves to keep it steady, a tiny pair of limbs keeping his hulk of a stallionhood in place. By the time her muzzle had covered half of his flare, Shining realized just how much smaller his little sister really was.

But not, it seemed, too small. Brows furrowed, and hooves digging a bit into the sides of his girth, Twilight looked determined to make it all the way. He could actually hear her jaw creak a bit as she pushed her muzzle wide enough to take the whole thing—and slipped it in, just past her lips.

Shining grunted. Twilight’s teeth had bit into his head, making the first sensation a thoroughly unpleasurable one. “Not your teeth,” he murmured. “They...nggh. Hurt.”

Recognition dawned in Twilight’s eyes. If she’d been able to, she would have nodded. Instead, she carefully rearranged his cock in her mouth so that he felt only the softness of her gums against it. Shining groaned, letting Twilight suckle on his shaft as his hoof traced tiny circles on her back.

She couldn’t go down too far—it wasn’t long before Shining felt his head bump against the back of her throat. Still, it was an impressive feat on its own. At thirteen inches in length, and now over two inches in girth, it was no small accomplishment for a filly of Twi’s size to take his flare in at all, let alone swallow any meaningful length beyond that.

And yet, as Shining watched, Twilight was able to make her way past a whole four inches. His meaty flare bulged out her cheeks as she went. Her whole expression was the very picture of determination. His head throbbed again, a new glob of pre bursting against her tongue. Twilight took it in stride; in fact, from the way her eyes lit up, she liked what she was tasting. She gulped down his leaking pre easily, the drool from his swollen shaft trickling down her throat as she swallowed more and more of his cock. She bottomed out at six inches, but that was more than enough to get Shining’s chest heaving with almost painful arousal.

Slowly, Twilight began to draw her head back. A thin line of Shining’s precum ran down her chin, her mouth too full of his meaty shaft to close entirely. The suction of her lips around his member was nonetheless incredible; in that moment, there was nothing more that Shining wanted to do than take his little sister by the cheeks and push his shaft all the way down her throat, facefucking her and dumping his load directly into her stomach. He could see it now: the bulge in her throat, the widening of her eyes, the smacking of his balls against her muzzle—

But no; this was Twilight. Even if she was doing...this with him, he couldn’t do that to her. Not now, or yet. This was her first time, after all.

Shining’s eyes fluttered as Twilight’s lips slipped over the tip of his flare, this time on their way back down. “Oh, fuck,” he groaned. His cock lurched in her mouth, the flare bulging against her cheek. “Oh, fuck. Oh, yes—”

For the first time in over three days, Shining Armor came. Every almost-orgasm, every drop of seed that had wanted to escape his nuts, but had been forced back by Twilight’s spell—all of it seemed to come roaring out as Shining’s hips bucked wildly.

Twilight’s eyes widened as the force of Shining’s hips shoved his cock another two inches past her muzzle. It bulged obscenely in her mouth, cum bursting from his. Thick ropes of Shining’s seed erupted in Twilight’s muzzle, what felt like cupfuls of hot, creamy seed flooding directly down her throat and into her stomach.

Twilight’s jaw creaked; Shining’s member was just too big. The sheer force of his orgasm was pushing his cock back out of her mouth, but his girth had lodged in firmly above her tongue. Shining whinnied in pleasure as his long-suffering nuts dumped what felt like every drop of jizz that they could muster right down his little sister’s throat. Pulses of warmth ran through Shining Armor’s body, singing through his veins as he finally hit the release that he’d been waiting for.

Between pants of all-encompassing pleasure, he heard Twilight groaning. Foamy bubbles of cum were starting to leak out around the sides of her muzzle, strings of jizz trailing down her chin. She was gulping down his spunk as fast as she could, each new half-cup of seed filling up her cheeks before she swallowed it back down to make room for more. Shining’s nuts bulged and churned, eager to spill their seed in such a willing subject.

With a whiplike jerk, Shining’s member popped free of Twilight’s mouth. The pressure was simply too much, the force of its cum-eruption simply too great. Twilight toppled back onto the bed, moaning. Her prone form made an optimal target for Shining’s spasming cock, which splattered her belly, muzzle, and legs with rope after rope of his seed. By the time he was done, another five seconds of mindblowing, intense orgasm later, a good quarter of her body was covered in his creamy white.

Shining groaned as he came down from his high. His cock shuddered a final time, then fell still. Twilight lay groaning on the bed, her hooves on her cum-matted belly. It bulged a bit, somewhat swollen from all of the jism Shining had pumped into her. It looked, by all indications, that she’d just had an oversized meal—and given the amount of protein that her brother had just unloaded down her throat, she may as well have.

Instantly, Shining’s cheeks flushed a bright red. “Oh, geeze, Twily,” he said. He pushed himself forward so that he was leaning over her; his cock slapped wetly against his belly. “Are you okay? I should’ve warned you. I didn’t mean to hurt you.”

Twilight groaned. She reached up to wipe her eyes, then scrunched up her nose when she only succeeded in wiping more cum onto her face. A flash of Shining’s horn cleared most of her eyes off. “M’fine,” she grunted. Her eyes fluttered open, and she glanced down at her slightly rounded tummy. With a mesmerized look on her face, she prodded it, tilting her head when she saw her hoof sink into the soft, cum-padded surface. When she pulled her hoof away, she left her belly sloshing, a thread of Shining’s spunk connecting her hoof to her matted, cum-stained fur.

“What is this stuff?” she asked him, wide-eyed. She held up her white-coated hoof to her muzzle and sniffed it. She frowned. “S’not like the other stuff.”

Shining just sighed. He sat back onto the mattress and winced when his balls slapped against his thighs. Evidently, they still weren’t completely drained. “That’s my cum, Twily,” he said. A sudden thought made him check back over his shoulder—toward the door—before continuing. “A stallion’s penis make it when he orgasms.”

“Orgasm?” Twilight said.

“Kind of the end of sex. For a stallion, at least.” Shining hesitated. “It’s the thing that can feel the best out of the whole thing.”

“So I made you feel good?” Twilight said.

Shining caught the hopeful glimmer in her gaze, and beamed at her. “You made me feel great, Twily.” His cock throbbed again, and Shining felt his still cum-filled orbs sloshing. “Though it looks like I could go for another one,” he muttered.

Twilight nodded along with him. She eyed her hoof for a moment more, then licked it. “Tastes salty like the other stuff.”

Shining chuckled. “Sorry for...ah, making you swallow it all like that. Some ponies like to do it, and I just didn’t think.”

“S’fine.” Twilight kept looking at her hoof, turning it from side to side so that different parts of it caught the light. “Do fillies make cum, too?”

Shining’s ears perked up. This was the first time that Twilight had brought up the possibility of her own pleasure. “They do,” he said. “Not exactly like stallions do—it’s not white, or sticky, and there’s a lot less of it. But mares can orgasm too.”

“And it feels good?”

Shining remembered some of the lewder magazines he’d...borrowed from Dad’s closet. A goofy grin on his face, he nodded, and said, “It feels very good.”

Twilight looked hopefully up at him. “Could you help me org—orgasm, too?”

Now there was the question he’d been waiting for. Shining’s muzzle quirked upward, and he nodded quickly. “Sure! Here, let me come down next to you.”

He plopped down onto the bed next to her. His heavier weight sunk into the mattress, the sheets ruffling as his elbow pushed up toward her headboard. Shining grinned into his sister’s eyes, then gently nudged her with his muzzle.

“Lemme just move over a bit, okay?” he said. “You can get on my lap, and I’ll show you all about it.”

A few seconds later, Shining’s head was resting against Twilight’s oversized, fluffy pink pillows. The filly herself lay on her back, right on top of his stomach. Shining cradled her in his left hoof and rubbed softly at her belly with his right. He could feel his seed sloshing around inside, and silently smiled. He hoped there’d be more of that to come.

His cock, still hard and engorged with arousal, poked up between Twilight’s legs. It cast a thick, dark shadow over her torso, its shaft still streaked with white. Twilight eyed it, her head nuzzled right up beneath Shining’s chin, as it steadily dripped droplets of precum down onto her chest. Shining just chuckled.

“Okay,” he said, cuddling her a bit closer. She was only about half his size—less, even—so it was easy to get a good grip on her. “You know where your vagina is, right?”

Twilight pointed to it. Shining grinned, and moved her hoof down between her legs.

“Right,” he said. “But did you know that rubbing against it can make you feel good? Just like with my cock.”

Twilight’s lips formed an “o.” She suddenly gasped when Shining’s hoof brushed against her cute filly lips. “Ooh!”

Shining instantly stopped. “You okay?” he asked.

Twilight nodded. “It just felt...weird. That’s all.”

“It might at first,” he told her. “But given time, you’ll also realize how good it feels.” He swallowed. “Do you mind if I touch it again?” Twilight thought for a moment, then nodded shyly.

Shining smiled. He readjusted his posture a bit, edging his shoulders up the headboard of the bed so he could have a better look over Twilight’s shoulders. As he did, the base of his cock rubbed against Twilight’s folds, eliciting an “eep!” of surprise from the filly’s muzzle. Shining chuckled, then slid his hoof down her stomach and toward her crotch, pushing his shaft away to make room for his next move.

Slowly, Shining began to rub at Twilight’s clit. He started with large circles, moving his hoof across her crotch and slowly tightening the radius. A droplet of liquid, warm and slick, touched his fur. He heard Twilight whimper, but when he hesitated, she shook her head.

“Keep going?” she said, still shyly. “It...does feel a little good.”

Shining was happy to comply. He massaged her folds a little more vigorously, and savored the cute little moan of pleasure that escaped Twilight’s muzzle. He could feel his heart beating fast in his chest, and stifled a tremble in his hoof. A bolt of daring surging in his gut, he bent forward and planted a kiss on Twilight’s forehead.

“Still feel good?” he murmured, stroking her flank with one hoof as his other went to town between her legs. Twilight’s lithe thighs trembled, another whimper escaping her lips.

“Do you want me to keep going?” he asked.

“Y-yes,” she mumbled in reply. “Please.”

He smirked, and moved his head forward. His ears twitched, savoring the soft, high sound of Twilight’s answering “Oooh.”

Shining had moved from nuzzling her cheek to nibbling gently on her shoulder. His tongue pressed against her shoulder has he kissed her fur, her mane brushing against his cheek. As he slipped the tip of his hoof inside of Twilight’s fillyhood, he heard her breathing become labored. Growing more daring by the second, Shining massaged her flank as he brushed his snout up and down her neck, still vigorously stroking her moist, tight insides. He could barely fit his hoof inside of her tight, vaginal walls, but the second he slipped inside of her, Twilight’s whole body tensed.

She was like a spring, all tight and wound up on his chest. Shining slipped his hoof around his member and pulled it against his sister’s thigh. A steady drool of pre leaked down onto Twilight’s chest, his slick shaft rubbing against her leg as he worked her tender fillyhood. Twilight’s cute moans and whimpers drove him forward, pushing him to help her reach her peak. His fat cock pressed into her cum-filled, sloshing belly as he helped her masturbate.

Shining buried his face in her mane, taking deep breaths of Twilight’s sweet, innocent scent as she moaned in pleasure. He could feel her muscles tensing, flexing, then relaxing against his as her haunches twitched. Twilight cried out cutely as Shining’s hoof brushed against her G-spot, his thick, brotherly hoof finding her sweet spot for the first time in her life. A spasm of her lips around him left it damp with her pleasure, her whole lower body twitching and lurching as her breaths grew increasingly labored.

“Shining,” she moaned. “I’m—ooh, I feel like—ooh, yes!”

Twilight squealed, her body convulsing as the force of her first-ever climax hit her. Shining’s rock-hard cock ground against her chest, feeling every lurch and spasm of the little filly’s body as her inner muscles clamped down around his hoof. Twilight’s hips jerked violently, her moans reaching a fevered pitch as the heat in her young loins reached its peak.

And then she was finished, coming down from her high as her vagina winked in with the aftershocks of pleasure. Twilight panted, sweat streaming down her forehead. She went limp in Shining’s grasp, collapsing entirely against his chest. When he brushed her mane away from her eyes, there was a deep, rosy blush covering her cheeks.

She was breathing heavily. “W-was that an orgasm?” she panted.

Shining softly stroked the side of her neck. “Yes, it was,” he murmured, nuzzling her cheek. “How’d it feel?”

She drew in a shuddering breath. “Good,” she finally said. “Really good.” She glanced up at him, something unreadable in her eyes.

He gave her a kiss—not on the forehead or cheek, but on the muzzle. His lips locked against her smaller ones easily, his big tongue pushing its way into her mouth. He tasted her saliva, tasted himself on her tongue. She almost pulled away at first, but then relaxed into it, letting the pull of the alien experience draw her along. When Shining finally pulled back, Twilight was breathing a bit more lightly, though the blush on her cheeks was even deeper.

“Mommy and Dad do that,” she said, giving him a shy look. “Do you...really love me that much?”

Shining hugged her closer, and planted another kiss on her neck. “More than anything,” he whispered, grinning. “You’re my Little Sister, Best Friend Forever, after all.”

Chapter Six

For a few moments, the two of them lay there: Shining, his head sinking back into a pillow, and Twilight, snuggled against his chest. For a minute, Shining heard only Twilight’s soft breaths, felt only the rise and fall of her chest against his own.

Then, Twilight looked up at him. “Shining?” she asked.

“Mmhm?”

“Was that...sex?”

Shining hesitated. “Kind of,” he said. “When you were sucking on my...well, penis, that was what’s called ‘oral sex’.” He coughed. “Though that’s not entirely what sex usually refers to, no.”

Twilight’s nose wrinkled. “But you felt good, and I felt good,” she said. “If that’s not sex, then what is sex?”

Shining’s hoof brushed against her fillyhood, and Twilight moaned cutely. “Well,” he murmured, nuzzling her cheek. “It’s when a stallion puts his cock inside of a mare’s private parts.”

“My vagina?” Twilight asked. Shining nodded. “Can we...do that?”

Instantly, Shining’s cock throbbed. His nostrils flared, and a wave of arousal hit him. Struggling to keep his sudden lust under control, he shot his sister a strained smile. “Are you sure? It might...hurt, a little.”

“Would you have sex with Cadance?”

“I—geeze, Twilight.” Shining scratched the back of his neck, chuckling awkwardly. “If she’d let me, sure. Though don’t tell her that,” he added quickly.

“Then why not me?” Twilight cuddled into Shining’s chest. “Don’t you love me more?”

“Uh…” Shining swallowed. His re-emerging arousal was rapidly lapping up against the sides of his mind. Not only was he still somewhat pent-up, but Twilight was willing… He’d longed for days to pound that prime filly ass, and now she was just offering it to him?

He swallowed again. “I love both of you,” he said quickly. Then he winced, his cock giving a particularly violent throb. A fat glob of pre splattered onto Twilight’s back, breaking over her fur with rivulets of warm, milky-white.

Welp. That made up his mind for him. Somewhat sheepishly, Shining said, “Heh. Guess I’m still pretty turned on.” He shrugged his shoulders and grunted. “So, if you really want to…”

“I do!” Twilight nodded firmly. “I want to know everything about sex.”

“Everything might be a bit of a tall order,” he said dryly. “But we can start here.” He checked the door again—still closed—and threw up a quick shield spell to be sure. It would filter out most of the noise; frankly, if things got loud, he wanted to make sure that nopony heard them at all.

Twilight turned over and lay her belly on his chest.  She pushed herself forward; as her chest pushed against his, her tight little flank pushed up a few inches into the air. Shining could barely keep his eyes off it. “So what do we do?” she asked. Shining half expected her to take out a notebook and quill.

“We do this,” Shining said, and kissed her again.

Nopony in their right mind would expect a filly to be a good kisser. All the same, there was an...innocence to Twilight’s lips that pushed Shining onward, a curiosity that drove her into new experiences. She didn’t quite understand what Shining’s tongue was doing in her mouth—that much was clear. But she reciprocated nonetheless, clearly doing her best to investigate this strange new act. Shining moaned into the kiss as her little hoof traced down his chest, his cock throbbing against her flank.

His flare was aligned with her fillyhood; he could feel her slit brushing against his tip, her warm folds teasing him with their slickness. Shining pushed his shaft right up against her opening and heard Twilight gasp. He let her pull away from the kiss, her eyes wide.

“Is that—is that you?” she asked him.

Shining nodded. “I’m going to put it inside of you, okay?” Twilight’s muzzle shook slightly, but she nodded. Taking that as a green light, Shining returned his focus to Twilight’s flank.

Tenderly, he spread her flanks so that his member would have ample room to move in. Each one of her cute little butt cheeks was barely bigger than his flare; in fact, his entire cock just dominated his view of her backside. As one edge of his flare slipped inside of her, Twilight gasped again. She’d bit down on her lip, her eyes wide as she felt him push his way inside of her.

“Is that alright?”

Twilight’s head bobbed. Shining decided to keep going.

He pushed a bit further in—and Twilight groaned. Shining almost did, too. She was so tight. He felt like he could barely get even half of his mast inside of her—and that was just by girth. Her tight fillyhood had clearly never been penetrated before tonight, and just one edge of Shining’s fat cock was already stretching her to a breaking point.

Twilight whimpered softly as Shining pushed himself further inside of her. “I-it’s so big,” she panted. “Ooh. Oh, oh.”

“Does it hurt? Should I stop?”

Twilight shook her head. “I wanna finish,” she said firmly. Shining sighed good-naturedly, but a throb of his cock reminded him of his priorities. Gritting his teeth, he spread Twilight’s flanks a little wider and pushed.

She cried out, unable to stifle her gasp of pain as his entire flare pushed into her nethers. Instantly, Shining felt an incredible tightness, like nothing he’d ever known. He felt like he could barely move an inch forward or back; when he flexed his shaft on reflex, Twilight’s inner walls bulged around him, molding to the shape of his cock.

And he was only an inch and a half inside of her.

Putting on his best big-brother face, Shining reached up and brushed a strand of her mane out of her eyes. “It’s okay,” he hushed. “It’s in. That’s the widest part. It’s in.”

Twilight hiccuped. “It...is?” she asked uncertainly. His cock throbbed inside of her, and she squirmed a bit. “O-ooh. I can f-feel it.”

“How does it feel?” he asked her.

She grunted, one eye squinting. “Like...like you’re just there,” she mumbled. “In all of me. I don’t know.”

“Don’t worry too much about it,” Shining said. He smirked at her. “Just...try to enjoy it, okay?” She smiled back.

Slowly, Shining eased himself into her. Twilight moaned, squirming as he embedded more of his shaft inside of her. Inch by thick, meaty inch of his turgid stallionhood filled up her fillyhood. He could feel her stretching around him, her tiny filly body flexing around his shaft as he pushed her body into new shapes with every inch. Her flanks clenched around his shaft, stroking his length as he pushed himself even further inside of her.

By the time she’d pushed down to his medial ring, Shining had buried a full eight inches of his length in his sister’s cunt. Twilight groaned, mewling softly as each new inch of her big brother’s meat was hilted in her virgin pussy. Finally, after hiccuping again, she grunted and said, “I-I don’t think it will go in any more.” She bared her teeth in something resembled a smile, droplets of sweat beading on her forehead.

Only about half of Shining’s cock was buried inside of her. As he shifted her on his chest, though, he felt something wide and hard pushing against his chest. His eyes widening, he pushed Twilight a bit off of his stomach, keeping his cock firmly inside of her.

A fat, round bulge strained against Twilight’s stomach, the flare of Shining’s member clearly visible against the outline of her skin. Twilight groaned as he twitched inside of her, the circle of his head shifting against her walls and stretching her in new ways.

“O-ooh,” Twilight moaned. Shining took hold of one of her hooves and held it over the bulge in her tummy.

“You feel that?” he asked. “That’s me, inside of you.” He gave his hips a little jerk, and another half-inch of his length pumped past Twilight’s winking lips. Her lips opened into a wordless whimper, something in between pleasure and pain swirling in her eyes.

Twilight swallowed. Her hoof rubbed against the bulge in her stomach. She traced across every contour, every curve of his flare. His cock lurched inside of her; he could feel the splatter of precum against her warm, tight insides. Twilight’s answering moan matched the tightening of her fillyhood around his girth.

“How do you feel?” Shining asked.

Twilight licked her lips. “...Full,” she said, after a moment. She had her hooves on his stomach, and was just barely able to keep herself from going any lower by balancing on either one of his thighs.

Shining grinned up at her. He curled his hooves tighter around her waist. He could feel the curve of her hips beneath them. For now, they were tight, slender, smooth—but one day, they’d be a mare’s hips. His erection twitched, and for a moment, he couldn’t decide which one he preferred. If he were honest with himself, though, he didn’t really care.

Both were Twilight, after all.

He rubbed the mound on her tummy softly, savoring the sensation of being inside of her. “You feel full, huh?” he murmured, stroking her fur. “That’s just how much I love you.”

“Love you too,” Twilight mumbled. She slipped another half-inch down Shining’s cock, spearing herself further. A moan burst from her lips, a thin string of saliva going from the top of her bottom to the top. She was panting slightly, still over-stretched from Shining’s girth inside of her. “O-ooh.”

Shining darted up and planted a kiss on her lips. When he came back down, his hips pushed up. The very edge of his medial ring brushed against Twilight’s filly lips, driving her eyes wide open. As another glob of his precum burst against her walls, he pulled his hips back down. His flanks sank a bit into the quilt before pushing back up again. Before long, he was pumping his length into Twilight like a piston, slowly at first, then faster, harder, the sounds of her labia schlicking down his member mixing with her steady pants and moans.

Shining’s mind was a mess of pleasure, satisfaction, shame, and pride. He’d done more than introduce Twilight to sex. He was taking his sister’s virginity—his filly sister, who’d be barely old enough to even do math if she weren’t a damned genius.

And he loved it. Oh, but he loved it. Biting his lip, Shining grunted out. “Oh, f-fuck, Twilight. You’re just so tight.”

Twilight squeaked. His medial ring had shoved up against her fillyhood again, pushing her marehood to its limits. “Y-you’re so big,” she retorted.

Her words just made Shining’s erection throb even harder. His balls were churning between his legs, sloshing every time he bounced Twilight up on his cock. He fucked her like a pogo stick, bouncing her up and down, rocking his hips up and down as he pistoned himself inside of her again and again. Pre was leaking from her lips, which were clamped tightly around his member. It streamed down his shaft in milky white rivulets. He could feel his nuts swelling with cum, filling up as they prepared to unleash their load right into—

his sister.

Shining groaned. He rubbed the base of Twilight’s flanks, savoring the softness of her Cutie Marks. When she went all the way down, now, she made it almost two-thirds of the way down his cock. Given that his shaft was more than half as long as her torso, that itself was an impressive feat. The snugness of Twilight’s insides, forbidden to him for so long, embraced his flaring girth with a velvety caress that threatened to squeeze and milk him dry.

Every pump of his hips made his cock spasm in Twilight’s cunt. Before long, a good three inches of his length was straining against her belly every time he thrust himself inside of her. The sheer amount of precum pouring into her, the ocean formed by Shining’s pent-up weekend, was starting to round out her tummy, too; he could hear her womb starting to slosh in symphony with the half-gallon of spunk he’d unloaded into her stomach.

“Twilight,” Shining grunted. “If—if we keep going, I’m—I’m going to cum again.”

Twilight’s reply trembled a bit. “Am—am I going to cum too?”

Shining’s muzzle curled into a smile. Sweat rolled down his cheeks from the effort of fucking his sister. “You will,” he grunted, shoving his hips up into the air. A squealing moan burst from Twilight’s lips as his shaft bulged obscenely from her belly, spreading her cute filly flanks wide around his slick ring. Inside or outside—it was no longer a question. He gave her flanks a squeeze, and grinned when she squealed again. He was going to fuck Twilight’s pussy wide, and was going to pump her ripe, prime fillyhood with cum. He, Shining Armor, B.B.B.F.F., was going to be the first stallion to ever jizz inside of his little sister’s fillyhood—and he was going to fill her with his seed until she was ready to burst. The reality of his fantasies was finally hitting him; his libido was roaring in his ears, demanding a release. “And it will feel amazing, I promise.”

“Sh-shining,” Twilight mumbled. Her hooves was shaking. “O-oh, Shining, this feels so good. I—I—oh!”

The pressure in Shining’s loins reached a tipping point. On reflex alone, he yanked Twilight all the way down to his crotch. He bottomed out inside of her, her little filly’s haunches folding over his fat, churning nuts as her cunt contracted and spasmed. Twilight’s squeals of pleasure filled his ears, the absolutely massive bulge of the cock spearing his sister’s fillyhood filling Shining’s eyes completely.

As Twilight squealed, her legs and arms spasming and her pussy walls contracting, Shining felt himself go over the edge. He came—and he came hard.

Grunting with absolute pleasure, it was a struggle for Shining to keep his lucidity as he came inside of Twilight. His cock flared hugely, flooding Twilight’s fillyhood with his cum. He could hear it splattering against her insides, could feel her warm walls squeezing around his cock and milking him dry. He imagined her begging him for more, begging to be filled up with his jizz.

And fill her up he did. Shining groaned, again and again. His hips jerked wildly, thrusting up and deforming Twilight’s stomach around his flare repeatedly. He could actually see the smaller bulge atop his tip, where the steady flood of his hot jism into her young, virginal womb was pushing against her skin and filling her up. His cock lurched and contracted, shot after shot of his load erupting inside of his little sister as he filled her up with his load.

Before long, Twilight was groaning, her little hooves straining to reach around her distended belly. Sweat poured down Shining’s forehead; his hooves were slick with it, coated in a mix of his and Twilight’s juices, their musks—his, masculine and sexual, hers innocent and sweet—filling the air of the room as both filly and colt sang out through their climaxes.

After what felt like an eternity, Shining’s orgasm finally stopped. Twilight’s own legs had finally stopped their violent spasms, and had now settled to just twitch against his sides with the aftershocks of her peak. Panting, Shining let the warmth of release spread through his system, the empowering embrace of satisfaction falling over his mind. With a grunt, he turned over onto his side; his cock slipped out of Twilight’s fillyhood and slapped against his belly. His sister hit the mattress with a thump and groaned, still cradling her swollen stomach in her hooves. He could hear it sloshing with his seed, and felt a perverse, glowing sort of pride in his chest. She’d been able to take it all—had been able to take all of him.

Panting, Shining reached over and turned Twilight to face him. She was panting too, and looked even more exhausted than he did. And yet, there was a glow about her, a shimmer behind those tired eyes that betrayed a happiness and satisfaction far beyond what he’d even dare hope for.

“How was that?” he murmured. He reached up to stroke her mane. “Feel like you learned enough about sex?”

Twilight groaned, though her muzzle turned upward into a smile. “I learned a lot,” she giggled, hefting her oversized belly.

Shining’s cheeks flushed. “That...doesn’t usually happen,” he confessed. “I don’t think. I was just...really pent-up.”

Twilight’s face reddened, too. “I really like having a belly this big,” she said. “It’s so round and soft. And...I can feel you inside me, even though you’re not.”

Shining’s blush intensified. So what if this was wrong? It felt...right. Lying here with Twilight like this. On an impulse he could register as neither solely brotherly, nor sexual, he curled a hoof around Twilight’s shoulder and hugged her close to his chest. Perhaps it was both.

“Do you like feeling me inside you?” he whispered.

Twilight nodded shyly. “...Yes,” she said. She nuzzled against his chest. Shining felt a tingle go up his spine.

He swallowed. He knew what he wanted to say next. But he didn’t know if he could. Tonight had been fueled—brought about, really, by desperation. By a strange, twisted obsession born of an all-empowering, entirely physical need. And yet...feeling Twilight curled up beside him, feeling her heartbeat against his chest, the soft stirring of her dripping nethers against his hoof… The pure rightness of it all washed over him, and suddenly he knew what to say.

“Would you...want to do it again sometime, maybe?” he said quietly.

Twilight yawned. “Mmhm.”

“Okay,” he said. “But you can’t tell Mom and Dad, okay?”

Twilight blinked blearily up at him. “Why not?” she said.

Shining tried to shove down an awry pang of guilt. “Because they’d...get mad,” he said. “Just like the Talk, okay? It’ll just be between us.”

Twilight appeared to think about that for a minute. Finally, she bobbed her head pleasantly and buried her muzzle in Shining’s side again. “‘Kay,” he heard her say, muffled and sleepy.

He sighed, grinning helplessly. Well. That was that.

Shining glanced back toward the door. He’d have to leave soon, and hope that neither Mom nor Dad had checked in on his room in the meantime. But…

He could cuddle with Twilight. He could share in her first afterglow, if only for a little while longer.

He loved her, after all. She could expect nothing less.