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"You promised!"

"You cheated!"

Jaidyn glared at his twin sister, trying his hardest to simply not hit her. With a snarl he turned away, then paused. It wasn't as if he could go stomping off to his own room like he wished he could have, so instead he let out a deep sigh and sat at the edge of his bed, facing his sister's bed in the far corner. A few moments passed in silence, then he felt her insistently jabbing him in the back with her tail.

"Stop that."

"I didn't really cheat.."

Except that, in his eyes, she had, or at least knew their bet had been unbalanced from the moment it had left her lips, and that was pretty damn unfair considering the stakes. Aaren had innocently suggested that they compete to see who could score higher on the year's last district final exams. He'd waved the suggestion aside of course-it was a pointless idea because they both always scored near perfectly each year. He should have known though that she wouldn't have suggested it in the first place if she hadn't planned on hooking his interest somehow.

The prize was anything the other wanted.

How many times had he seen a situation like that on tv shows or in fictional stories? And he knew where they always ended. Trouble of some kind. Of course he'd never thought to find himself in that same exact situation, and he wasn't sure what exactly it was she thought he would ask for, but he decided to let himself be hooked.

He chose the new Zera 3x gaming system that was just about to release, knowing very well that it would not only force her to ask their parents for an advance on her allowance, but that she'd also have to sit out in the hot summer sun waiting in line to make sure he got one. He had mentioned both clearly to her, giving her a chance to stop being stupid, but she'd agreed, and then told him what she wanted for her prize.

It was crazy, but he had said 'sure' at the time because then it hadn't sounded crazy, especially when compared to nabbing the Zera 3x for free. They worked out that a tie neutralized the bet and that whoever got the higher score won. They'd both gotten a perfect hundred just like he expected, having studied harder than ever before for the bet's sake. What he hadn't expected was his sister having earned a meager five points of bonus credit because of the tutoring program she helped in, bringing her to one-oh-bloody-five. Meaning, technically, she had won.

He fell back on his bed and sighed again. A weight settled next to him and he saw his sister's pretty face peering down at him, soft honey-gold fur outlined with rich black, front a softer creamy hue and hair a deep dark black, just like him.

"Come on! Please? For me?" Her soft brown eyes were pleading.

"You know how much I hate being mistaken for a girl," he told her, prodding her belly with his own bushy tail, ears angrily flat. "And you want me to pretend to be one? I don't think so."

"No one told you to keep your hair long like mine."

"I think we're only still confused for each other because you're so darn flat chested."

Her features twisted into a cute frown. "Girly freak."

"Sir Flatchest."

She leaned over him, resting her arm and head on his chest, peering at him with narrow eyes. "You lost, so pay up. You've never broken a promise to me, so don't start now."

He didn't say anything, but he knew that somehow he'd end up doing it anyway because his sister really was a lot like him, including being clever enough. They also knew each other extremely well; she would have guessed what his reaction would be and would probably conveniently bring something up give him a 'nudge'.

Jaidyn hoped he was wrong.

"I bought you your stupid new system anyway, you know," she finally said. He sighed again. "I was going to give it to you tomorrow night as a surprise." She made an annoyed expression. "I waited six hours in line to get it for you and I won't get my allowance again for two months."

"You wanted it as much as I did," he said weakly. It was true, and she would definitely play on it alongside him, but as she would also no doubt point out, it wasn't 'theirs' but 'his'.

"Jaidyn."

"Fine."

He raised an eyebrow at her smug expression, but didn't say anything. Tomorrow was going to be an annoying day, but if he just thought about the Zera 3x waiting for him at the end of the day, maybe it wouldn't be so bad.

Aaren woke him up early, just as the sun was rising. While he wiped the drowsiness away from his eyes she left to shower and returned to dress just as quickly, as always unbothered by being nude in front of him even though it embarrassed her for either of their parents to see her naked. That had come from a lifetime of shared sibling baths and, as they'd gotten older, having been forced to continue sharing the same room because their parents' plan to buy a larger house had been indefinitely delayed. It would had been awkward to make a big deal out of it, so they simply hadn't. She didn't care if he walked around shirtless or dried himself in the room and he certainly didn't care if she lounged in her undies and bra.

He slipped out of the bed and left to take a quick shower himself. When he returned Aaren gestured at the clothing she had set on his bed. A pair of too-tiny panties, bra, a typical skirt and tank top set, and the high socks he'd seen more girls wearing. All it matched what she was wearing exactly. He grudgingly admitted the dark colors matched her fur well and did make her look pretty darn attractive. Which meant so would he..

"Don't make that face," Aaren said softly, tail sweeping high behind her. "It's not like it's the first time you've worn clothing for girls."

That was unfortunately true. With the unintentional cruelness parents sometimes forced on their children they'd had both been given unisex names. As they had grown their mother and father had found it a delight to disturb and tease both guests and family by dressing them identically as either girls or boys, or dressing them simply. No one had ever been able to tell what they really were as far as gender went-some of their relatives still weren't sure and that made for some uncomfortable birthday and Christmas presents.

So, despite being a boy and Aaren a girl and not even being identical twins because they were different genders, they had pretty much been mistaken for each other or for the wrong gender for most of his life, sometimes even by their own parents. His mother had kept their hair the same length as they'd gotten older and by the time he was old enough to make the choice himself he was already used to it. He even admitted to liking the more intelligent, mysterious look it gave him. After all, he'd expected this problem to end once they reached puberty. Unfortunately fate had a nasty sense of humor; he had retained all of his boyish...girly, features and curves, which wasn't all so bad because most girls at their high school found it extremely attractive, but his long hair and soft, somewhat pitched voice only made things worse. He'd long gotten used to others stumbling over his gender when first meeting him.

What was probably worse was that his sister ended up being pretty flat chested instead of plumping out like all the other girls. She was definitely curvier than he, and did have a bit of breast, but unfortunately not by much in both cases.

So...nothing had changed. Except that now no one mistook them for boys, especially after seeing Aaren beside him and assuming they were identical twins.

A pang of pain brought him out of his thoughts. "Stop drowsing off and strip."

He rubbed his ear where she had twisted it, glaring at her, but stripped down until he was naked. Her wandering gaze didn't bother him as he slipped on the panties, finding it a tighter fit than it probably was on her because of his sheath. He put the bra on without much effort, having helped her with hers several times, and donned the rest of the clothing.

When he was finished she rose, clasped his hand warmly, and led him to their mirror. Staring back were two nearly identical girls, both young and beautiful. Satisfied, she made him sit while she brushed his hair-not a first for her either-and reminded him annoyingly to sit and walk like a girl, and to smile.

"Mom's at her certification meeting and Dad went with her to keep her company, so we have the entire day to ourselves."

"I'm only looking forward to the end of it."

"I promise we'll have fun," she replied, rolling her eyes.

And for the most part they did, he admitted, as most of the day went by innocently. It was the kind of thing they had done when they were younger and even still did sometimes. He'd go shopping with her, buying only a few bits of clothing for himself and usually only because of her nagging while she went crazing with her own purchases, then they'd head over to the arcade and kill hours fighting over the top spot on scoreboards. Sometimes they'd watch a movie or grab some dinner afterward and it would be a nice end to a fun enough day.

Today was not exactly like that. Many eyes, all of them male, stared at them appraisingly, and not at their faces. A few even went out of their way to flirt with them, to his embarrassment, but Aaren insisted each time that he had handled himself perfectly well. Other than those small annoyances he realized he actually didn't even mind dressing like a girl so much. It was exhilarating and naughty, gave him a tingling high from deceiving so many people so easily.

And so evening eventually came. Aaren insisted that they go for a walk in the park together before heading home, so they did, and afterward they sat down on a scratched wooden bench to rest while watching all the people crossing the concrete courtyard littered with vendors.

"Feels..naughty, doesn't it?" Aaren asked idly, ears lowering as she swayed her feet.

He didn't say anything which for her was enough of an answer.

"Hehe." She seemed pleased. "It's kind of something I have a thing for."

He gave her a short laugh. "Really? I suppose that's better than making me do it just because you hate me."

She shrugged. "If you had a girlfriend and she asked you to do this, would you?"

"No."

"But you did it for me," she said smugly. Then, more softly, "If I asked you to, would you do it again..?"

He hesitated for a few quiet moments, then gave up. "Probably.."

"I'll keep that in mind. Even if a guy I liked could pull it off, I think he'd probably leave me if I asked."

"Probably," he said, grinning with a swish of his tail.

"Hot day today, isn't it, ladies?"

They both looked up to see two boys around their age walking up with ice cream cones in both hand. They sat down on either side of them, and the boy wearing a shirt from a competing high school offered him a cone.

"Thank you," he said, taking a cue from his sister who was already enjoying hers.

"Sexy little twins like yourselves would be hard to miss at Westren High," the other boy said, stretching an arm behind Aaren. "What school do you girls go to?"

"Arcna High," Aaren said.

The boy beside him flashed Jaidyn a charming smile, pointed ears perked, his tail trying to inconspicuously curve around his, but not touching. Jaidyn smiled at him, licking at his cone.

"Arcna?" the boy said, nodding. "Aren't too many bad things I can say about the place, especially if they're keeping cuties like yourselves around. I'm Runan, and that's my friend Drarl."

"I'm Aaren and this is my sister Jaidyn."

"Pretty cute name," Drarl said to him.

"Um, thank you," he replied.

"So," Runan began. "You girls want to go for a walk or something? Maybe get some dinner?"

A arm went around his shoulders at about the same time Drarl's began to teasingly stroke his tail, sending ticklish shivers down his back. A warm hand squeezed his thigh and he tried his hardest not to slap it away.

"Hmmn," Aaren said, looking thoughtful. "It's tempting to let ourselves be treated by such handsome boys, isn't it Jaidyn?"

"Mhmn," he replied as cheerfully as he could manage, busying himself with his ice cream.

"Dude," Runan said, laughing. "She's so teasing you by licking the ice cream like that."

"Yeah," his friend said, laughing as well.

He blinked, not having really been licking the ice cream in any particular way, least of all in a way that they could interpret as actually flirting.

Thankfully Aaren decided to finally end it all. "Maybe next time, guys. It's been a long day. Thank you for the ice cream though."

The boys took it with better grace than he expected, nodding cheerfully. "Well, if you ladies ever want to hang out we jog here every day. We'll keep an eye out for you."

"Okay."

They stood and left talking excitedly to each other-about them unbelievably-and soon they were one with the currents of walking bodies. Aaren licked at her ice cream cone for a few moments, then leaned in close.

"Do you have a hard on?" she whispered delicately.

"And why would I have one? I don't like guys." He said it automatically, probably before realizing that he did have a hard on.

"I know that," she retorted. A golden tail brushed across his lap. "Oho, you do. So..did you like being flirted with? Or how about the hungry way they looked at you even though you're really a guy.. did it arouse you? Hmmm?"

"Just shut up," he said grumpily, swishing his own tail.

She finished off her cone in a few large bites, then grasped his hand and began leading him off to who-knew-where. Her tail weaved cleverly between them, the tip inconspicuously concealing his crotch. It became quieter as they went deeper into the forested park until eventually all they could hear was the distant roar of passing cars.

"Here we go," she said, pushing him inside the women's side of a bathroom building that didn't look well kept. "No one uses this bathroom with all the restaurants bordering the park."

"How do you know that? Use it often?"

She made an indignant face, pushing him into a stall and closing the door behind them. "I have a reading spot nearby and just noticed it never gets used."

"Whatever," he replied, sweeping his tail and then instantly regretting it as it slapped against the stained sides of the stall. "Why are we here?"

"So you can..you know.." Her eyes traveled downwards.

"Oh."

"Yeah.."

"Um," he said uncomfortably. "It'll go away in a bit..I just have to think about numbers or something. It's already mostly gone."

"Oh.."

"Yeah."

"Don't-" she began, face flushing and tail curving nervously. "You think that would be a wasted opportunity, though?"

"Meaning?"

A sigh rushed from her lips. "You're pretty dense sometimes."

He raised an eyebrow. "I couldn't do it with you watching me anyway.."

"What if...I helped you?"

He blinked. "Meaning..?"

"Geeze," she said, sounding exasperated. "Just turn around."

He did as she asked and almost immediately felt her move behind him, arms around his waist. He moved his tail out of the way while hers curved down between his legs, stroking his thigh slowly. One of her warm hands slipped beneath the skirt and into his panties, then began fondling his balls.

"Oh."

"Yeah." She laughed a little nervously. "I've never done this before, so tell me how you like it."

"Okay.." Awkwardly he taught his sister how to, well, give him a handjob. It felt as weird as it sounded in his head.

She followed his instructions, teasing his balls with one finger and playing with his sheath until the reddish tip of his cock rose enough for her to get a handful. Then she began tugging on it, hard enough at first that he yelped and earned a hasty, nervous apology from her. After a few more tries he got her at a more acceptable rhythm, one warm hand fondling his balls while the other hand pumped and squeezed his hardening cock.

"I think I got it," she said, her breathing a little fast. Then she pressed her cheek against his, looking at his dreamy expression. "Hmm, are you fantasizing about me?"

"I'm still hard, aren't I? So no."

"Jerk." She made a mock wounded expression, then grinned. "Think of whatever girl you like then and just enjoy it."

She began to pump slowly faster like he asked, occasionally slowing or alternating her squeezing. It felt incredible; way better than when he did it. The girl's clothing he was wearing, having her press behind him like that, and her tail brushing against his thighs all also sent pleasant tingles throughout him, making him much hornier. He leaned further down and she bent with him, roughly massaging his balls.

"Mm...your cock is so big..I don't think it'll fit.."

"What?" he asked, blinking.

She giggled. "Atmosphere, atmosphere. I'm just trying to help." She placed her short muzzle next to his ear, her damp breath ticklish. "I'm so wet for you...please mate me..."

It bothered him to hear his sister's voice saying these things in such a lusty way, but at the same time it also really turned him on. Really.

"Ugnh...I feel it sliding inside my sticky pussy. It's squirming and twitching and feels so warm.." She pumped long and slow, rubbing his tip.

His breathing quickened, legs spreading further apart as he supported himself on the water tank of the toilet. His tail wrapped around her waist.

"Mngh..not so hard, you'll knot me and then I'll become pregnant taking all of your sticky streams of cum."

And as she twisted and fiddled with his cock, dripping precum pooling from the tip, his veined knot really did begin to inflate. She squeezed it with one hand, pumping faster and faster with the other until he felt a powerful orgasm rising slowly and purposefully.

"Ah~" his sister's breath was hot and burdened. "Your throbbing knot is filling me so much, so tightly it hurts...but I want you to mate me anyway Jaidyn, I want you to cum inside and make me your willing bitch.."

That sent him flying over the edge. "I'm cumming inside you, Aaren.." he breathed, thrusting his hips while she pumped furiously.

His orgasm came in a powerful eruption, shooting hot streams into the bowl thanks to his sister's careful aim. She continued to stroke him, squeezing down hard on his knot, until the soaring streams of sticky white finally began to slow. He didn't recall having ever cummed that much, or having had an orgasm strong enough to turn the sounds in his ears into distant roars.

After he finally finished his muscles relaxed and Aaren rested her weight on him. They gulped air for what seemed an eternity, then Aaren finally stood and looked at her messy, cum covered hands while he lowered the seat and sat down on it.

"Do you want me to lick it?" she asked very slowly.

It was a question of the moment, he knew. He could see all the lust and naughtiness still built up in her like it was in him, the reality of what they had just done not yet able to pierce their carnal high.

He didn't even hesitate. "All of it."

She obeyed, letting him watch her lick and suck of all his sticky cum from her fingers and then showing him that she had swallowed it all. Afterward they stood there quietly, the pungent scent of fresh cum mixing with the fouler scents of a bathroom that desperately needed attention.

Then they stared at each other at the same exact moment, eyes widening.

"You said my name," he accused, frowning. "You were fantasizing about me."

She crossed her arms. "Well, you said mine right when you came."

They quieted down, both-eerily-watching as his erection calmed.

"You have a really big knot. It's nice." His sister's face was still flushed, but she said it as if it were casual conversation.

"Um, thanks. It's never been that big before," he said, stumbling over the words. "It's because you did, um, such a good job I think."

"I'm glad you liked it."

"Yeah." They stared at each other for a little while longer before he finally said, "Are you ready go home?"

She nodded and took his hand after he stood and adjusted both his panties and skirt. Their journey home was made in silence and they reached it just as the sun was falling beneath the horizon. They slipped inside without a word, shuffling through the living room.

"I'll make something for dinner tonight," she said hesitantly. "As another thank you for today. And," she grinned. "Your present is under your bed, behind the box where you keep all your porn. We can try out that stupid game it comes with later, yeah?"

"Yeah," he replied uneasily, grinning back.

He went to their room and sure enough it was exactly where she said it was. He set the box on the night stand serving as an unused border between their halves of the room and flopped on the bed, thinking back to what they had done earlier. Not that dressing up as a girl for one of his sister's kinks was any better, but getting that physical was definitely worse. Growling, he began to take off the panties and the rest of the clothing as he sister stepped in.

She watched him for a moment, then closed the door and came to his bed, stopping his hand as the panties were halfway down his thighs.

"Stay like that," she said quietly, climbing onto the bed with him, then pushing him down and straddling his waist.

"W-what are you doing?" he asked, alarmed.

"You know what I'm doing.." she replied, leaning down, ears flat and tail swishing nervously.

"We're not doing this."

"What if.." She paused and chewed her lower lip. When she spoke again her voice was a barely audible whisper. "What if I said I'd do whatever you wanted...? You could put it in my butt...or make me use my mouth, or make me roleplay whatever you wanted. As long as you dress like that for me every so often and do a few other things, I don't care how naughty or nasty or screwed up it is, I'll do whatever you want." Her voice dropped even lower, somehow. "Anytime you want...even when I'm...in heat..."

He was stunned into silence, but luckily didn't have to answer because after a moment his sister's eyes widened and she coughed, delicately readjusting the way she was straddling him.

"I suppose that's a very hard yes," she said, trying her hardest not to laugh. "What do you want me to do first?"

It was crazy. Really crazy and screwed up. But he commanded his own sister into a position he'd always fantasized about anyway, licking his lips in anticipation. She didn't hesitate, turning away from him on all fours, slowly tugging down her panties and then lifting her tail high. He saw her pussy gazing up at him invitingly, already wet and sticky.

"Don't be gentle.." she breathed, swaying her bottom.

He crawled on top of her, sinking his entire length roughly and hungrily into her resisting slit, interlinking his fingers with her own. She released a throaty yelp and shivered beneath him, her bottom already grinding against crotch. They became a melding of feral lust and need, grunting and rutting like animals. He pushed her down onto the bed, pounding hard enough that she was forced flat except for the small rise and curve of her bottom.

He nipped her ear softly, then, unable to help himself after hearing her lusty noises, harder.

"Bite me even harder," she begged, wiggling her bottom as much as she was able. "Make me your bitch, Jaidyn!"

His knot inflated to full almost instantly at hearing that, and she pleasantly moaned and breathed as he crammed it inside her tiny pussy. Her own muscles sought revenge and clenched down at it cruelly, locking them together. Unable to pull much further away, his thrusts became deep and heavy. He felt her shudder and whimper as she came, the convulsions of her pussy milking his cock as if they were designed for each other.

He let out a hot, jagged release of breath as he came into her, pumping fiercely with each painfully powerful twitch and spurt of cum. Her whimpering only increased as she came again at being filled, clenching down on his knot like a vice and aching for every last drop he had.

Finally their tense muscles relaxed, ears and tails and bodies flopping tiredly. His heart thundered as his lungs tried to suck in more air than they could possibly hold. He felt so satisfied, so completed. He brushed a length of hair from Aaren's face and playfully licked her cheek.

"I can't believe we're going to be doing this regularly," he said.

She laughed in response, craning her neck to give him a seductive gaze. "Anytime you want to, Jaidyn..you don't even have to ask." Her face twisted into a sillier one. "Though you'll have to stop cumming so much...your knot is enough without all that cum also swishing around inside me, ugh."

He grinned and nibbled her ear teasingly. They sat in companionable silence for another hour, his knot still securely keeping her tied and her inadvertent clenching and tugging even causing him to squirt a bit more inside her every so often, to her amusement.

Then there was a knock on their door and their mother's voice said, "Kids? Are you home? We came back a little early and brought some dinner for you."

The door knob started turning as he and his sister glanced at each other in panic. He threw them off the bed on the side that faced opposite the doorway and fumbled for an excuse as the door swung open and his mother's golden-furred head poked in.

"Oh, Aaren. Where's your brother? It's pretty late." She raised an eyebrow. "And what are you doing looking through his things?"

He blinked. "Um.." Below, obscured by his bed, Aaren handed him his phone which he had left behind today. She then made gestures with her hands and mouth, which of course he couldn't understand, but looking at her gave him an idea for a decent enough excuse. "I was looking for his phone since he took mine again, the idiot. I think he went to get some cereal or something since we didn't want to cook."

"Oh," their mother said, shaking her head with a smile. "He does that a lot, the silly boy."

"Well, if you didn't bloody buy us the same exact model and color it'd be easier to tell them apart." He ignored Aaren's painful jabbing.

Their mother laughed and raised an eyebrow. "I guess that's true, but now you sound like your brother. Anyway, call him and tell him we brought dinner."

"Okay."

She left and he let out a relieved sigh. He glanced down at Aaren, still knotted to him, looking up at him with a grin.

"Next time," he told her with mock annoyance. "Lock the damn door."