Minnie shoved her naughty promise to her brother into the deepest depths of her mind while she dried Kyle and herself so they wouldn’t be late for dinner. Being a fire type accelerated the process, but she didn't exactly have time to properly straighten her fur, which led to slightly frizzy hair as she left the bathroom, Kyle hot on her heels.

She hoped the unusual ‘style’ didn’t catch Mom’s attention.

“There you two are!” Mom said as they entered the dining room. The delphox sounded more exasperated than usual. “Hurry your butts to the table, I made your favorites.”

The scent of fried magikarp drew Minnie in, with Kyle hot on her heels, the little fennekin sniffing the air with growing enthusiasm. 

“Karp sticks, woo!” he cheered as he rushed by, beating her to the table and plopping his rump on the floor cushion. “Thanks, Mom!”

Her stomach growled as she sat next to Kyle. “Thank you, Mom. Smells great.”

Kyle had already stuffed a third crispy-golden stick into his mouth by the time Minnie took her first bite. She moaned as the flavor hit her taste buds, and she chewed slowly to savor the delicious treat, before swallowing with a happy sigh. This is almost better than sex! 

Not that she had any sexual experiences to compare.

She took a second, much larger, bite, only to freeze upon realizing that her mother was giggling at her. “What?” she tried to ask, but the words came out unrecognizable, her mouth too full of fishy goodness. She swallowed loudly. “What?”

“Nothing, dear,” Mom said with a smile. “By the way, what happened to your fur? Did you take a bath too?”

Oh, Arceus, there it is. Taking a bath with her brother wasn’t wrong, per se, but it could raise questions she didn't quite know how to answer. 

She gave Kyle a look as she replied, “Kyle got rowdy in the bath, Mom, splashed me a lot. Had to fire-dry myself, no biggy.” She faked a grumble and prayed to Arceus that Kyle didn't contradict her explanation. 

“Sorry, Minnie,” Kyle chirped after gulping down a greedant mouthful’s worth of Karp Sticks. “It won’t happen again!”

Dinner passed quickly, and before Minnie knew it she had taken a bath just by herself--to keep up appearances--brushed her teeth, and went to her room. She immediately jumped onto her bed on her back, staring at the ceiling while questioning her life choices.

She’d been so unbelievably horny and lonely the past few months, having to take care of herself, all by herself, with no cute boys to help her out. And now here was the perfect opportunity to fix that, dropped right onto her lap. 

If I let this escalate, who knows what me and my little brother will do tonight.

Mom had already tucked the fennekin in for tonight. That gave Minnie precious little time to decide how far to take things, as Kyle could slip inside her room any minute now.

Any minute being now, apparently.
 
Her door creaked open. Kyle peeked his head in, his big bushy ears folded back. “Minnie?” he whispered. “You awake? Can I come in?”

Say no. Tell him this was a mistake, that you can’t go further, and to please never tell Mom.

“Yeah, keep your voice down though,” she said instead, hoping she wasn’t making a horrible mistake.  

“Got it.” The younger-by-five-years pokemon obeyed, closing the door behind him with a soft click. He kept his body low to the carpet as he snuck over to the edge of her bed, where she sat up and scooted over the edge until her legs dangled off the side. This put her vulva on full display for the curious fennekin, her tip jutting out at eye level for him. 

Kyle stared up at her exposed spade with wonder in his big amber eyes. Excited and anxious, her vulva flexed beyond her control, twitching lewdly for her brother. 

Oh, gosh, I’m really doing this. He’s looking right at it!

“Wow… it’s moving a lot,” he commented, awe in his small voice. “Can I touch it?” 

“Y-yeah. If you want to.” Her heart pounded in her chest, and she took a deep breath. “Just be careful, okay? It’s sensitive. A-and remember, don’t tell anyone.”

“I’m not dumb,” her little brother huffed. Stepping closer, he raised a forepaw to her spade, only to halt mere inches away from her trembling flesh. “This is so weird. I can’t believe you’re letting me do this. It’s not a trick, is it? You’re not pretending it’s all okay, only to get mad at me after?”

It was a fair worry on the fennekin’s part. Minnie hadn’t exactly been the nicest sister over the past few years. Not mean, exactly, just… she sorta had always had a stick up her butt and it had taken their special moment in the bathtub to realize that.

She smiled down at her little brother. “I promise it’s not a trick. I know I’ve been… kinda mean sometimes, but lately I just get annoyed easily. I’m not trying to be mean. I’m curious about boys, very much so, and I want to do stuff with them. With you. You want to do stuff with me too, right?”

“Aren’t we already doing stuff?” He tilted his head at her, thinking. His eyes slowly widened. “Do you mean sex stuff? Not just ‘I’ll show you yours if you show me mine’, or touching, but… you know… touching our bits together…”

She licked her lips nervously, somewhat overwhelmed by how much he seemed to know. Her attempts to play it cool weren’t working--nothing could hide the way her vulva flexed. “Um, Kyle, what do you know about sex? N-not that I’m suggesting we-- uh, I’m just wondering.”

“Older kids at school talk about it,” he whispered while pawing at the carpet, “a-and the school says we’ll have sex ed in a few months. I don’t exactly know what it is, um, only that it makes babies and stuff. It also feels really, really, really good.”

Even that amount of knowledge surprised her. She still thought of Kyle as a little kid, her annoying, infuriatingly adorable, baby brother. While that remained true in many ways, if he was old enough to hump a stuffed eevee to completion, it stood to reason his school was ready to teach him sex ed.

“We’ll talk about this more after we touch each other, okay? That means you can touch me now.” 

“Okay, um. Here I go.” He was still staring at her spade, which hadn’t gotten any drier. She resisted the urge to reach down and unstick the base of her folds from her crotch fur, which had gotten stuck somewhat. I’ve never been this sticky before. What is my brother doing to me…

Kyle raised the same forepaw again, and with a deep breath, pressed it against her, producing a soft squish that sounded much louder than it was. Tingles spread throughout her crotch at the contact, making her vulva flex against the fennekin’s soft pawpads.

“Wow, it’s squishy!” he said, giggling as he poked and prodded at her sensitive dark flesh. “This doesn’t hurt? Your thingy is moving a lot.”

“It feels weird,” Minnie said. “But in a good way. Do you like it?”

“Yeah! Touching you is making me stiff, though, like I get when I wanna hump Shella. Is that normal?”

Oh, gosh, how is my little brother so sexy and so adorable at the same time? She held back a whine as she said, “V-very normal. Hey, um, maybe we can give each other orgasms?” Heart pounding in her ears, she licked her lips and finished, “Does that sound fun?”

He tilted his head. “Orgasm?” he repeated, slowing down his rubbing. Her spade flexed in protest. “What’s that?”

“It’s what you felt when you got twitchy with Shella, remember?” She was already in this deep, may as well answer honestly.

“Girls can feel that too?” He beamed up at her, which looked ridiculous with her spade in the way. “Awesome! Let’s do it!”

“O-okay, um, hop up here then.” 

Removing his paw from her neglected vulva, Kyle obeyed, hopping next to her. He playfully nuzzled her rightmost thigh before reaching a paw back between her legs, where her spade practically leapt into his touch, desperate for more attention. “Hehe, your vulva is funny! I like it a lot.”

Sitting on his haunches like he was, Kyle’s red tip jutted from between his hind legs. 

She swallowed heavily. “I like your penis a lot too,” she said, feeling dizzy from how fast things were suddenly moving. “B-before I touch you, you have to promise you’ll tell me when you’re close. I don’t want you making a mess on me or my bed.”

“Mess?” he questioned with a tilt of his head. His muzzle scrunched up all adorably. “What mess?”

What? She squinted at the fennekin, who happily played with her spade without a care for how stimulating it was.

“You know,” she pressed, trying to find the best way to phrase it. Failing to find one, she simply said, “When you squirt during your fun times with Shella. I don’t want that stuff in my room, so tell me when you’re about to orgasm, and I’ll, uh… lean down and swallow it.” 

I will?! Oh, Arceus, I just offered a blowjob to my little brother. What am I even doing? 

Kyle blinked dumbly, oblivious to her inner turmoil. “Uhhh, ew? I don’t squirt when I play with Shella! And if I did, which I DON'T, why would you DRINK IT? Drinking pee is gross!”

“Wha-- of course you squirt,” she insisted. “And it’s not *pee*, it’s semen. Boys squirt semen when they orgasm. The boy puts his penis inside here,” she reached down and, after only a moment’s hesitation, spread her spade open, showing off the deeper pinks within, “S-see? When a boy, like you, orgasms, he squirts here. It’s the whole reason for sex.”

She probably missed a few important steps in that explanation, but she was far too flustered and confused by Kyle’s seeming ignorance to care. How could a sexually-curious boy not know about ejaculation?

Kyle stuck his tongue out at her explanation. “Bleh! Good thing I don’t squirt sea-whatever, because that sounds gross!”

Is he too young? Has to be. Nothing else makes sense.

Now she also wanted to test his claim. Wanted to so, so badly. But what if he did squirt? What if boys only squirted for the first time when inside a girl? She didn’t think that was correct, but if it was they were screwed.

Didn’t make her any less wet.

“Ugh, I should have gotten some towels.”

The little fennekin giggled. “Yeah, ‘cause you’re all wet!” He plunged a toebean into her slit as he said this, generating a lewd squelch. “Hehe, gross! I like the sounds your pee hole makes, Big Sis! It’s funny.”

Her vulva flexed around his toe until he pulled out, which felt really good for some reason. His toe beans sliding across her insides, stimulating all her best nerves. Even for only a moment, it felt even better than rubbing one out. Was it because someone else was touching her there? Was it because that someone was her brother?

“Y-yeah, feels good though.” She let out a shaky breath. “Keep… keep touching me there. I’ll cum if you do.” At his blank expression, she added, “Orgasm, you know? When it starts feeling really good, then pop. You wanna see a girl orgasm, right?”

He nodded eagerly. “Yeah! So it’s really like when I start twitching?”

“Exactly like that!” Still breathing heavily, toes curling as pleasure built, she added, “k-keep going. It’s feeling really good.” Which was surprising, since Kyle had no idea how to touch a girl. His motions were all over the place. But the taboo naughtiness of being touched there by her little brother was providing much of her excitement, and she had a feeling it wouldn’t be long before she finished.

He’s gonna make me cum… oh gosh, my little brother is going to make me cum!

Oblivious to the tension building in her core, Kyle pressed both paws to her entrance and spread her labia. The action sent a jolt through her loins, making her gasp, but again, he didn’t seem to notice, too busy gazing inside with wonder in his eyes. Then he squished her folds together, generating a loud squelch as he closed her y-shaped slit, only to suddenly spread them apart an instant later.

Giggling, the fennekin said, “Nom, nom, nom!” as he opened and closed her vagina like it was a sideways mouth, confusing her greatly with his childish antics… at least, it would have, if the bizarre action didn’t feel so mind-numbingly awesome. “Hey, Sis! It’s talking! Hah!”

Gripping the blanket, her only response was a soft mewl as she came harder than she ever had in her entire life. Her spade bounced and jerked between the fennekin's paws as waves of relief radiated through her body. Kyle continued to try and play puppet with her contracting flesh, however, sending fresh ripples of stimulation through her with every squish and squeeze.

“Hehe, this is fun! I didn’t know you could move it like that!”

“I-I’m--hnn--cumming,” she explained through gritted teeth, “it’s not under my control! S-stop playing with it, a-a-and just squeeze it between your paws, o-okay? It’ll feel really good for me if you do that…”

He stared at her with his head tilted, seemingly not comprehending. Before she could repeat her request, he nodded and then did exactly what she asked: he placed both paws on either side of her jerking spade, and pressed together like he was trying to squish a piece of wet clay.

“F-fuck!” she blurted as intense tingles rolled through her already overstimulated flesh, perhaps a bit too loudly. “Ooooh, just like that… don’t stop, f-fuck…”

Minnie instinctively pushed into her little brother’s soft, warm paws as her orgasm played its course, thrusting her hips like some sort of sex-crazed pervert. Okay, she wasn’t humping him that forcefully, but she definitely enjoyed the way her spade felt sliding and twitching against his paws. Part of her wondered if this was what guys felt when getting a pawjob.

Kyle just giggled as he obeyed. “You said fuck~” he repeated, making her wince. “I won’t tell Mom or Dad, don’t worry.”

Yeah, because you telling Mom and Dad I said fuck is totally the biggest risk here.

Unsurprisingly, Kyle got bored well before her orgasm played its course, and she whined as he pulled his paws away. “D-don’t stop…”

“My paws hurt.” Whether or not he was telling the truth, she didn’t care. All that mattered to her was the sudden loss of such wonderful stimulation. Immediately, she grabbed herself with a hand, extending her climax to its limits. She sighed happily and slid her middle claw inside for something to squeeze on. He tilted his head.  “What are you doing? Didn’t you already, uh, coom?”

“D-doing this feels good.” She slid that claw in and out, shuddering. It wasn’t a tie, definitely not, but she knew her orgasm could last around five minutes if she kept up the pressure and friction. “I’ll show you how to extend yours too, just… give me a few minutes, phew… Enjoy the show~”

Such a corny line should have made her brother groan, but he took it literally. He plopped his rump down and watched. Kyle was surprisingly patient as her orgasm played its course. Spade bouncing and twitching the entire time, Minnie eventually fell back onto her bed and let out a bubbly laugh once the big part was over. 

“Okay, that was good. Thanks, Kyle.”

She pulled out her claw and twirled it around the tip of her spade, shivering. It wasn’t exactly where her clit was, but she was so sensitive that the pressure alone sent shockwaves through her trembling flesh all the way down to the buried nub.

He giggled. “You’re welcome! Does this mean you’ll give me a cum next? My penis says hi, see?” 

The little fennekin flopped over onto his back next to her, his swaying tail doing nothing to obscure the fuzzy balls and pink tip peeking from his sheath. The sight of her brother’s equipment made her spade throb, her arousal stubbornly remaining even after such a strong orgasm. 

Wanting--no, needing a better look, Minnie jumped off the bed and crouched by the edge where he was. “Hey, can you scoot your butt back? I want a good view before I make you feel good too.”

“Okay!” he said as he shuffled her way, all the way until his butt nearly fell off the edge of the bed. “Like this, Sis?”

Her mouth went dry. Her brother’s rear-end was so close. And with his large, bushy tail dangling off the bed, she had free rein over all the best sights. 

Unable to resist any longer, Minnie reached forward and pressed a claw along the fennekin’s inner hind leg toward his balls. Gently, carefully, she traced along the edge of one of the small fuzzy sacs, heart pounding as she felt his untapped masculinity brimming under the fluffy surface.

Kyle giggled and squirmed, his butthole tensing as she continued to fondle his balls. “That tickles!” 

“S-sorry.” She moved on after a few more seconds of satiating her curiosity. This was supposed to be sexual. Making him ‘tickle’ wasn’t quite her intention. “Want me to touch your penis now? It’s growing, that means you’re excited, right?”

He nodded. “Yeah! Are you gonna make me cum too?”

“I-if you want,” she said, psyching herself up for what was to come. Should they be doing this? Absolutely not. Were they going to do this? Absolutely yes. The only question was what this entailed. 

A handjob was a fun, simple option. She’d get to experience his orgasm against her paws, feel the way he throbbed, see how he flexed and twitched. Giving him a blowjob was also something she could do, but despite her offer earlier, she wasn’t quite feeling it anymore.

Besides, he doesn’t squirt, he said so himself. She had only offered because otherwise she thought he’d make a mess. Then again, if he doesn’t ejaculate, that means there’s another thing we could do. Hnnn, am I really considering this?

“Hey, Kyle? Are you positive you didn’t squirt?” she pressed, needing to be absolutely sure it was safe if she was going to let her brother put his dick inside her. She wasn’t in heat, so the odds of fertilization were low… but she didn’t want to take any chances. 

“Yep!”

She nervously glanced back at the door. “Good. I’m, um, how would you like to touch privates?” His eyes widened, and she rambled an explanation, “It’ll feel way better than anything my paws or mouth can do, and both of us get to feel good. So, j-just don’t tell ANYONE, seriously, and I’ll let put your penis inside…”

“R-really?” Kyle looked like he had been told he could buy any toy he wanted. “We can… touch privates? Like… I can put it in?”

Not trusting herself to speak anymore, she nodded and sat down on the floor. The bed would be more comfortable, but she didn’t want to stain her blankets.

And is staining the carpet any better?

A wide grin spread across the fennekin's snout.

“Woo!” Kyle jumped onto the floor and stood on his hind legs, stepping forward. She would have giggled at the way his little stiffy waved in the air if not for how unbelievably sexy the sight was. As it stood, she bit her lip when his firm tip smushed against her thigh, his forepaws on her belly for balance. “Oops, missed!”

Her heart nearly exploded in her chest at the contact. “Th-that’s okay,” she breathed, barely keeping it together. “Just-- just move a bit until your penis is touching the right spot. Don't put it in until I’m ready, got it?”

“Got it, Minnie! Hehe, you’re the best big sister ever!”

I’m about to have sex with my little brother, she told herself as the brother in question giggled to himself, tongue sticking out adorably as he shuffled his hips in an effort to line them up. The warmth of his taper brushed against her folds, tense and stiff, only to slip to the side, her flesh too slick.Oh, gosh, he’s going to put it in, isn’t he? I should tell him to be more careful, to just… touch it against me. If he’s wrong about not squirting… But if he hits me just right, it’ll slide right--

Twin gasps filled the room as Kyle’s tip suddenly slipped inside. The sensation proved too intense for the young fennekin, who held deathly still as his penis throbbed and grew, swelling within her and making her realize exactly how big a penis could feel. 

“S-sorry, I didn’t mean to put it in yet!” he whined, though he didn’t pull away. “You feel really nice!”

“It’s okay, “ she assured him through clenched teeth. “You feel nice too. You can… thrust, if you want.”

“Like this?” Kyle pulled out and pushed back in, making her squeak at the sensation coursing through her previous virgin spade. Big, tingly. Warm and throbbing. “H-ha, that felt nice…” 

She barely held back a squeak. “Y-yeah, it does. Keep going.”

“Hehe, you bet! This is the best!”

And just like that, her own brother was mating her. His penis swelled with every hump, stretching out her poor, unused spade to the point that should have hurt. Except it didn’t. Nothing felt so wonderful. So right. 

Minnie held her brother close as he rocked his hips. Arms around him, she encouraged his thrusting with gentle nudging, pushing him to go faster, urging him to get deeper. Scratching that itch she always knew she had, but could never get at.

At some point during Kyle’s enthusiasm, Minnie was knocked fully onto her back. The fennekin only paused his humping for a moment, eyes wide and worried, but when she smiled at him, he took that as his cue to hump even faster. 

The floor thumped, enough to break through the haze of lust. “S-slow down, you’re making a lot of noise. Mom’s room is downstairs, remember?”

He eased his thrusting, though didn’t stop. “Okay,” he whispered into her belly, his hot breath tickling her many nipples. “I’m--ha--close to the thing. Should I pull out now?”

Yes. “No, do it inside.” She squeezed her eyes shut. “If you’re not squirting yet it doesn’t even matter.”

“Y-yeah,” he huffed. “I really don’t wanna pull out! S-something’s coming, though! I-I think I’m about to twitch!”

My brother’s going to knot me. With that realization came a sort of peace. He can’t get me pregnant… I’m not in heat, he’s not producing sperm. Double safe. Ha, I’m going to cum so hard from this…

She could already feel the imminent orgasm creeping up on her like a tightly coiled spring, threatening to violently leap away from her.

Minnie held Kyle close to her chest. “I love you, Kyle,” she whimpered as she passed the point of no return, tensing around the fennekin's fattening knot as her underbelly swelled with pressure. “Cum with your big sister.”

Whining into her chest, Kyle did exactly that. It started with a twitch. Then two. Eventually his cock bucked and flexed, over and over, stimulating all sorts of nerves. His knot grew larger all the while, stretching, ballooning her vulva to proportions that hurt more than she thought it would. The pain danced with the pleasure, intertwined to the point she couldn’t tell where one ended and the other began.

“S-sooo goood, Minnie,” Kyle said, panting hard. “Sooo goood…”

His voice barely breached the haze masking her thoughts. She was close. So very close.

She squeezed Kyle like a plushie as the pressure, the tension, all of it released in an instant. Her insides exploded into motion, squeezing, milking the fennekin’s knot, hugging him in ways no sister should. Pleasure rolled through her insides, electrifying nerves and sending stars dancing across her vision, but even through her toe-curling orgasm, Minnie found herself looking into Kyle’s wide, attentive eyes and leaning forward, warmth building in her breast.

How had she never noticed how adorable her little brother was?

Minnie licked the fennekin atop his head. He giggled as the action ruffed his fur. “Love you, Squirt,” she said. It wasn’t something she told him enough. “We’re both--hgn--cumming now. It’s… intense. Your knot is a lot bigger than I thought it’d be.”

“S-sorry…”

“It’s a good thing,” she assured him a bit giddily. The initial rush of climax had died down, but her body refused to release Kyle’s knot, and so Kyle's knot refused to stop twitching. A back and forth dance between their flesh, perfect and right. She felt… complete in ways no masturbation session had ever accomplished. “I don’t think it would be this good if it didn’t feel like a hard balloon was twitching inside me.”

Kyle snorted. “A balloon? That’s so dumb! You’re dumb!”

She fake-gasped. “You take that back!”

“Never!”

They broke into giggles, laughing at the absurdity of what they were saying. They were literally having sex. Actual penis-in-vagina, knot-tied-to-spade sex. Truly past the point of no return. Their relationship was forever changed, and could never go back to how it had always been. And yet, they still bickered like siblings over the dumbest of things. They could still argue, tease, and play. Just like before. Not before they had sex, but before Minnie became a teenager. Before puberty changed their relationship for the first time.

That was what was funny to her. It was silly. It was strange. It was super weird. But somehow, someway, having sex with her brother had fixed their relationship. 

Their privates continued their twitching, unthinking dance as she beamed at her brother, who beamed right back, giggling like a maniac.

Minnie wouldn't have it any other way.