Flopping into his comfortable, familiar bed at home felt so good. Shining Armor felt like he’d really been through the wringer today. The test had been grueling. The anxiety over his score had literally taken his breath away as he waited to hear the results. Then there was the thrill of finding out he’d made it – almost a perfect score! And, of course, trying to make it through the rest of the day of training while having all of that on his mind.

But his day wasn’t over then, either. His parents had taken him out to a fancy Canterlot dinner, which was great and everything, of course, but it came with its own stresses. It still took energy to get through. And over the course of the dinner, Twilight Velvet had put away just a bit too much wine ... and when they’d gotten home, Night Light had made it far, far too clear that he was ‘taking her to bed early’. Shining refused to think of what that might entail. Velvet had been brushing her body against Dad all night, nuzzling him, rubbing her very blushed cheeks against his neck... Shining shook his head. No. He was not going to think about what was going on in that bedroom just one wall away. Thankfully, their apartment was in a high-end building, even by Canterlot standards, so the noise insulation was good. He was at no risk of hearing what was happening over there.

So, after going through all that in one day, he was very ready to just flop on his bed and enjoy the absolute luxury of doing nothing for a while. And soon, sleep. Blessed, blissful sleep.

Not yet, though. His door creaked open, then shut again. Hm... No way Mom or Dad would be coming out yet. So it must be... “Twiley?” he said, without looking up.

She gasped slightly. “How did you know?”

“You should never underestimate the mystical intuition of a B.B.B.F.F.” He was in no hurry to explain his suspicions about Mom and Dad, especially not to a cute and innocent little filly like Twiley. Dealing with knowledge like that could wait. It could wait a long time. Hopefully she’d never have to block out the kind of images that were trying to seep into Shining Armor’s imagination.

Twiley jumped up onto his bed. He could tell from the way it moved and the slight creak of the springs. The mattress was old. A hand-me-down from his parents, but it was bigger and better than the one it had replaced. She seemed excited about something – she was moving quickly. Jittery.

“I found some neat new stuff to read,” she said. Ah, that explained the excitement. “It has words in it that even I don’t know!”

Well that was saying something. Might as well give in and play along with her. She did deserve it, after all. She’d been so well behaved at dinner. Didn’t try to read a book at the table or ask a thousand questions to the waitstaff or anything. He rolled on the bed, turning toward her. “So, you want to play?” It was already well after her bedtime, but whatever. They could spare a little time to give her some fun. He could stay up a little longer, and so could she. “Soldiers versus the Evil Giant Unicorn?” That was a favorite of hers, though his old toy guardsponies were starting to take a real beating as her fledgling magic improved.

Twiley shook her head.

“Book fort?” That one usually didn’t go quite as well. Twiley tended to get distracted by reading one of the books before they could complete any tactically sound fort.

She shook her head.

Okay, time to bring out the big guns. “Dabble?” That was a word game that Twilight always beat him in, despite being so much younger. There was no way she’d say no to that.

Still, though, she shook her head no. What the hay?

“Then what?” He was legitimately at a loss. What could she want if she’d already passed up on all her favorite games to play with him?

“I just wanna ask you a question.”

He shrugged, still sideways on the bed. “Alright, I guess. Go for it.”

“What’s a blowjob?”

Shining choked, as if somepony had just knocked the wind out of him. He shot up straight in the bed, sitting on his haunches. Oh horseapples. Why couldn’t Mom or Dad be here to answer a question like that? Wasn’t she too young to know this kind of thing? But he knew she’d never stop trying to get her answer. That was just the way Twiley was. And he wasn’t about to risk knocking on his parents’ door and finding them in the middle of ... something. Possibly that very thing. “Where ... where’d you even hear a word like that?”

“Here!” She pulled a slip of paper out of her mane, laying it in front of his forehooves.

One free blowjob♥

Oh... Oh no... The coupons... And she’d presented it to him. He could already feel the familiar constriction of his muscles, the tightening around his chest. Even though it wasn’t Cadance giving him the coupon, the hex obviously didn’t care. It had been triggered.

No no no no no!

“Where...” He gulped, his mind both racing ahead and refusing to think about what had to come next, all at once. “Where’d you get that?”

“I found it under your bed!”

Ugh! He knew he should have found a better hiding spot. But Twiley knew all of his hiding spots. Where could he have put it? Nothing came to mind. His hooves feeling heavy as lead, he took the coupon from where she’d put it in front of him. What else was there to do? The consequences of not doing it were ... not to be risked.

But he couldn’t do it, could he? She was so young – and she was his sister!

What to do? What to do? Oh crap...

Twiley lunged forward, planting her front hooves on his chest so she could get all the way up in his face. “Hello! Equestria to Shining Armor!”

He groaned. There wasn’t any other option, was there? “Okay, um, so... Do you, um, know how colts are different than fillies?”

“Boys have a penis and girls have a vagina, duh!” Twiley rolled her eyes, as if he was being condescending to a much older pony.

Well, that helped, but... “Hey, who told you that already?”

Twiley grinned and settled back down onto the bed, looking quite smug and proud of herself. “Princess Celestia gave me full access to the Canterlot Library, and I can read an anatomy book, duh.” She deflated a little, looking away. “But it still didn’t say what a blowjob is.”

It was really uncomfortable explaining something like this to his little sister. She was so close. It was almost like he could still feel the slight warmth and pressure of her hooves on his chest. Then again, he’d have to tell her something, wouldn’t he? And he’d have to do more than just tell. The hex wouldn’t be satisfied by just telling her what a blowjob was. She’d given him a coupon, and the coupon had to be satisfied.

He hesitated for another moment before forcing himself to say, “Okay, well, um... I guess it helps to already know the anatomy...” There really wasn’t any use in putting it off any longer, was there? He could already feel a slight burning sensation in his gut, an itchiness in his hooves ... the beginnings of a compulsion to go to Princess Celestia’s next official royal audience. He took a deep breath. This was going to get weird. “A blowjob is when somepony puts a stallion’s penis in their mouth to make him feel good.” There. He’d said it.

Twiley cocked her head to the side a little. “Huh? How is that supposed to feel good? It’s supposed to be inserted into the vagina and deposit the stallion’s seminal fluid, resulting in the fertilization of an ovum. The book said so! Are you saying the book is wrong?”

“Well, there are other ways to do things besides just what the anatomy books say...”

Ugh! There was no way around it, was there? He had to. She presented the coupon to him! And he was not announcing his most embarrassing secrets in a public audience with Princess Celestia! That was not an option! Which meant... “Do you...” He gulped, then forced himself to continue saying what he absolutely should never say to his sister. “Do you want to try it?”

Maybe if she said no, that would revoke the hex and that would be enough? Oh Goddess... What if she said no and that didn’t remove the hex?

“Yeah!” Twiley said enthusiastically. “I got a free one. The coupon says so!”

He sighed. Well, no way around it now. “How did you even find these coupons?”

“I sensed magic coming from your room, and it felt dangerous, so I thought I’d protect you from it!”

Wait... What about the rest of the coupons? He darted to the edge of the bed, peering over and underneath. Then under the stack of comic books... They were all gone. All of them! “Twilight! Where’d you put them all?”

“Hidden away, where they’re safe.” She looked really proud of herself now.

Oh horseapples! He was really in trouble now, wasn’t he? Maybe, maybe he could convince her to give back the rest of the coupons. But what if giving them back to him activated the hex ... on all of them at once? He couldn’t! His mind just couldn’t process how that would be. No... He had to find some way for her to just tell him where the other coupons were, and—

Something poked at his sheath.

He jumped a little, looking back at himself. At the unholy image of his sister’s hoof nudging against the rim of his sheath.

“So... How am I supposed to get the penis to come out?” She leaned in closer, peering directly at the opening. “I can’t put it in my mouth if it doesn’t come out.”

Shining tried to ignore the sight ... but his eyes ending up drifting to an even worse place. As Twiley peered down at his sheath, she’d stuck her rump up in the air, not quite exactly pointed at him, but that little off angle meant that he could easily see under her tail. And while he normally used the restraint that any polite and civilized pony would exercise around their closest family members ... given the context of what was about to happen, he couldn’t help himself. He found himself staring right up under his sister’s tail. Between those heartbreakingly curved ass cheeks. At her petite and perfect little filly pussy lips. So smooth ... she’d probably never even been touched there... The little bulb of her vulva just stuck out so pertly and perfectly.

“Oh! There it is!”

Shining winced. Yep. He could feel it. His cock was beginning to slide out of his sheath. Because he’d been staring at his filly sister’s pussy. Oh Goddess ... how was he ever going to explain this to Cadance?

How little could he get away with and still satisfy the hex? He rolled to the side a little, giving her better access. “So, um, you just lick the tip a little bit, and that’s a blowjob.” A little white lie wouldn’t hurt anything ... not really.

Without hesitation, Twiley leaned forward and planted a long, luxuriant lick over his still-emerging tip.

Oh. Oh no. That felt way too good. More of his cock slipped out, emerging rapidly and starting to stiffen already.

Twiley licked it again, tonguing almost his whole length this time. “It tastes funny ... but it’s really warm, and I like the way the skin feels!”

He forced himself to put a stop to this before it could get any worse. “Okay, that’s enough, now let’s—”

She didn’t stop licking. If anything, she went at it even more, flicking her tongue back and forth across his shaft as she slid across it.

He moaned. He couldn’t help it. She had no right to be this good at it! And there was no denying things now – he was getting fully hard, his cock dragging against the bedsheets as it fully stiffened, forcing him to turn further on his side ... which only gave Twiley even better access to it.

“Ooh! It’s getting much bigger now! Can I lick the rest of it too?”

She was already licking everything he had. What was she talking about? He hated himself for saying it, but at this point, the damage was already done, right? “Um... Sure, go ahead.”

As it turned out, what Twiley meant by ‘the rest of it’ was his balls. She went down there with the same single-minded attention she’d been giving his shaft, sliding her little filly tongue cleverly around each and every curve of his balls, even nuzzling around them and licking the sides of his sack. Even as accustomed as he was to Cadance’s amazing blowjobs, Twiley was making him tingle all over and making his cock arch hard against his belly. To be feeling like that from her ... his own sister! She was so cute down there, going at it so earnestly!

Next thing he knew, she was working her way back up his shaft, tracing every vein and contour as if she was trying to memorize it. Maybe she was. This had to be the first erect cock she’d ever seen in real life, right? Didn’t she realize how weird it was for that to be her own brother’s cock? Apparently not. She slid her whole mouth up the side of his cock like it was nothing.

“Oh wow,” Shining mumbled, unable to help himself. “That’s nice... Just like that.” He jolted, though, when he felt his little sister’s lips close around the tip, taking it into her mouth. “What—” He gasped. “What are you doing?”

She pulled off of his tip with an audible pop. “Did I do it wrong? You said I’m supposed to put the penis in my mouth, right?”

“Um, right ... I guess.”

Twiley went right back to it, taking his tip into her mouth again, as if this was something she’d done a hundred times. As if it was no big deal to be putting a much bigger and older stallion’s cock in her mouth. As if they weren’t brother and sister! She hummed in contentment as she slightly twisted and bobbed her head, working her tongue over his tip while still inside her mouth. Her little pussy winked open, showing the hot pink inside, easily visible with the way her tail was rising up.

She was ... enjoying this? She had to be! He stared at her little purple pussy as it winked open again and trickled out just a tiny bit of filly nectar. So cute! And so undeniably sexy. She was growing up faster than he’d realized. And she was definitely into having her brother’s cock in her mouth. And maybe even more than her mouth? When her pussy winked open again, showing a hint of the untouched depths inside just above her tiny heart-shaped clit, he couldn’t help but imagine plunging into that tight warmth.

That image, combined with Twilight’s earnest efforts on his tip and the vibrating pleasure of her little humming moans ... it was too much for him! His tip began to flare inside his sister’s mouth.

It was obviously too much for her. She choked a little, then yanked herself off of his cock, sputtering. “Ugh! It got too big for me!”

Though he probably could have stopped at this point and still satisfied the hex, Shining was too far gone to stop now. More than just the hex needed satisfying. He was breathing heavy, every muscle tight, every vein standing out. So close... “It’s okay,” he told her, “just keep licking it.”

“Okay!” Twiley went right back to it, stroking his shaft lovingly with her deft little tongue, once again reaching the farther places she hadn’t been able to get her whole mouth around.

He had no right to feel so good from his sister’s tongue. But she was just so soft and gentle with him, so teasing and yet so fulfilling! Cadance gave insanely good blowjobs, but getting one from her was usually an onslaught of intense pleasure. The soft, almost teasing touches of Twiley’s delicate licks were sending fire through his veins, building up far more pressure than Cadance usually made him suffer through.

Without thinking about what he was doing, without thinking about the ramifications of it, he reached one hoof out and touched Twiley’s pussy. So soft and yet springy under the frog of his hoof. So warm. It winked against him, kissing her virgin wetness against his hoof, and she moaned against his cock. She sure didn’t seem to mind being touched... His flare grew even bigger, even stiffer.

“Twiley,” he gasped, “I’m—”

His warning came too late. Or maybe his cock came too early. Either way, it meant that Twiley’s cute, innocent little face was absolutely drenched by his first blast of cum. She’d just come back to the very tip of his cock, which meant each powerful throb poured a thick stream of cum all over her face and mane, splattering a bit over the rest of her body, too. Some of it even got on himself – she’d really gotten him worked up!

Twiley squealed and giggled as she squeezed her eyes shut and let herself get covered, though. As if being showered with her brother’s cum was just another one of their games.

A knock came from the door. “Keep it down in there, please. Your mother’s trying to sleep.”

Shining’s heart skipped ten beats. He expected Night Light to open that door at any moment and see the last of Shining’s cum dribbling out onto Twilight’s muzzle.

Thankfully, though, the door stayed shut. And there was no further sound to make him think that Dad was still out there. It took an active effort of will for Shining to force himself to breathe again. That had been close! He didn’t even want to think about what might happen if Night Light had just walked in on the two of them like this!

Twiley was still giggling, though she’d toned it down to more of a whispering level. “That was fun!”

Reeling with post-nut clarity, Shining pulled his hoof away from his sister’s pussy and slid a little distance away from her on the bed. “Yeah ... it really was. I won’t deny that. But we can never do that again, okay? Brothers and sisters aren’t supposed to do this kind of thing with each other.” He glanced around, wincing at the mess. “Now, let’s get you cleaned up before...” Before somepony noticed the cute little filly plastered in fresh cum, of course ... but it didn’t really feel right to just say it like that. Thankfully, he and Cadance had some extra rags and wet wipes stashed around his room, for just such occasions. Cadance usually swallowed it all, but there could always be the occasional unplanned mess.

Twiley acquiesced easily enough to being wiped clean, though she was still grinning like a little idiot. Like a dangerously intelligent little idiot... Which brought up the topic of the remaining coupons...

“Now Twiley, we need to talk about the rest of the coupons, okay?”

In response, she only giggled again. Giggling like she had a secret, like she was playing some kind of joke on him. Oh ... that didn’t sound good. He didn’t like the sound of that at all...

Author's Note

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