

Katie rolled over in bed, restless, there was that funny feeling, that funny twinge again.  It had woken her up a few times recently and just felt..  weird.  Could it be nerves?  Had it only been a month since Peter had been to stay?  Somehow it felt longer, and yet, those three little words from Tommy still rang in her head.  She smiled and laid on her back, putting the book down, the thought of that definitely made a flutter in her tummy.  Everything had changed then, and Katie really struggled to remember how she really felt back when they were just brother and sister, when they barely tolerated each other.  She loved him!

There he was, she listened out for the soft sound of splashing as her brother took his evening bath.  Katie closed her eyes and just let her thoughts wander, a little sleepy, resting one paw on her tummy.  There was something about the splashing, she listened more closely.  It was..  it was..  very regular.  Very rhythmic.  Katie giggled suddenly and sat up as she realised what she was hearing, then a moment later swung her legs off the bed, blushing lightly.  She deftly dropped to the ground, picked up her pink dressing gown and crept out of the room.

It was unmistakable as she hung outside the door, covering her muzzle, a soft but rapid *splash-splash-splash-splash* was emanating from inside.  Katie tried not to giggle, did he want the whole house to hear him?  She couldn't wait any longer, braced herself, then burst in!  The sight awaiting her was delicious, Tommy stared, frozen, dumbstruck, reclined in the bath tub with his paw around his willy, panting with wide eyes.  It took a moment, but then he gasped, sunk deep in the water and tried to pretend he wasn't doing anything.  Katie chuckled and shook her head, quietly closing the door behind her and shucking off her dressing gown in front of it.

"Oh Tommy..  Were you..?"

By now the leopard had turned a deep shade of red and he shook his head, babbling, "N-n-no no no I wasn't, I-I-I was just washing in the bath Katie, w-w-why are you.."  He stopped and found himself staring at Katie's feet, which were suddenly next to the bath.  The boy's eyes travelled slowly upwards, up her slender spotted legs, her gently widening hips, the pale furred place where her legs met..  He gave a soft grunt, she was naked.

"Mmmhmm, of course you were." She nodded with hands on her hips, proclaiming the matter settled, enjoying the attention now.  After pretending to look around the room for a moment, Katie's gaze settled back on her brother and she cracked a crooked smile, spying an erection under the water which wasn't going anywhere, "You're lucky it wasn't Mum or Dad who came in, what would you have done then?"

Tommy just blushed and looked awkward, Katie found herself blushing lightly too as she considered her next move.  Eventually she crouched down and settled with her arms folded and rested on the side of the tub, smiling naughtily at her brother.  He smiled back nervously, then his eyes widened as she reached with one paw and slipped her arm into his warm water, under the bubbles.  Gently, so gently, she reached, brushing his thighs, making him shiver and tense, then higher, higher, there was his paw, protecting all.  She tutted gently, soothingly, easing it away, till Tommy's paws were both by his sides.  He looked away from her, biting his lip and blushing shyly.

Katie reached a little further and with a gasp from her brother, gently, lovingly cupped his balls.  They were tight and snug in the warm water, the fur a barely detectable fuzz, she could feel their shape and contents very well.  She bit her lip and heard him give a soft whimper as she explored them, rolling and squeezing the soft orbs in her paw.  But there was a distinct firmness underneath them, with a soft splash she reached higher and felt the reason, her paw closing around his stiff and proud erection.  Tommy groaned softly as she flexed it and gave it a squeeze, chuckling.

"Cleaned this pretty good, hmm?"  Still Tommy said nothing, but answered with a trembling surge.  Abruptly, Katie let go and stood up, the water dripping off her arm, Tommy turned and stared up at her.  As he watched, she blushed hotly, lifted one leg up and into the bath, steadied herself on the edge, brought her other leg in with a splash, till she was crouching over her brother.  

Sudden fear flashed across his face and he whispered, "Katie what are you doing?  Mum and Dad are just downstairs!"

Katie leaned over Tommy and put a finger to his lips, "Shhh..", before reclining back and getting a look of concentration on her muzzle.  She shifted in the bath and brought herself further over him, legs and feet in the water either side of his hips.  Watching him, looking into his slightly scared eyes, she hunkered down further, coming to a squatting position, shifting up a little more, till with a gasp her bottom met the warm water.  She bit her lip and continued sinking down, squirming at the feeling, noticing Tommy was watching between her legs now.  Playfully, she laid one finger on his nose, then gently sunk the paw down into the water, back towards her, reaching down between them..

Tommy drew his breath in sharply as she grasped his penis again, under the water, all stiff and wet.  With eyes wide he watched, licking his lips nervously, she was squatting lower and lower, shifting even nearer, and then with a soft moan from both of them she guided him straight up into her vagina.  Katie bit her lip again and put her full weight on him, letting out a delicious sigh as she rolled her head back, he always felt so good inside her.  And they'd not done it like this before, somehow the connection felt all encompassing with the warmth and wetness surrounding the twins.  She brought her head back up and looked at her brother, he was gritting his teeth and going all flutter-eyed, then she felt him surge powerfully in her.

They didn't get enough of this lately, she murmured and shifted a bit, holding one paw against her vagina, against their connection as his penis twitched again.  Katie looked at him with love as he reclined in front of her, dipping her other paw into the water and then gently running both of them up his tummy, up his chest, leaning forward, until their muzzles met in a kiss.  Tommy gave a soft groan and melted, surged in her again and pushed up with his hips.  After what seemed like forever, panting, they broke the kiss, both blushing heavily, Katie's tail raised up and out of the water behind her.  She leaned back, right back, reached behind them, between Tommy's legs and found his balls again.  He groaned more loudly as she held them and they both shifted in the water, giving him the strongest surge yet within her.

Licking her lips, perspiring, she looked hungrily at her brother.  He stared back, eyelids fluttering, then Katie squeezed his sensitive orbs and nodded at him, whispering breathlessly, "Do it.."  His eyes opened wide and he twitched hard in her, expanding, then a second time, a third, breath coming in sudden gasps, until with a spasm he went rigid, straining.  Katie heard the splash of his tail as it flopped behind her in the water, his loud groan, and then there was the first hot squirt of liquid so deep inside.  Second.  Third.

There was a sudden knocking at the door, the twins nearly screamed.  Forth.  Fifth.

"Tommy, are you in there?"  The voice of Dad called in softly, gently inquiring.  The cubs stared at each other, frozen like statues as Tommy continued planting his seed in deep shuddering squirts.  Sixth.  Seventh.  Eighth.

Katie gasped, put her paws over her muzzle, but it was too late and Tommy couldn't have spoken if he'd tried.  The leopard struggled to her feet and began clambering out of the bath as quickly as she could, forcing words out in a gurgling, almost scream,  "Sorry Dad it's just me!"  Tommy trembled as his last couple of squirts were lost under the water, making thick milky clouds as his sister stood up.  The girl nearly slipped as her wet paws hit the tiled floor running, a soft shiver ran through her at the very familiar feel of her brother's sperm leaking out of her already.

Panting, she was nearly at the door, eyes wide with fright as she saw the handle turning, "It's alright Dad, I'm," she tried to catch her breath, "I'm just.."  The door began to open, but caught against her dressing gown, Katie nearly screamed as she skidded up to it.  With a flourish that'd put a ballet dancer to shame, the leopard crouched down and slid, snatched the garment, spun right around, and stopped facing the door as it fell around her shoulders.  Claws tearing at the fabric, she fastened it round herself so quickly she nearly got whiplash, looking up just in time to see her Father coming hesitantly through the door.

Their eyes met, she was panting hard, blushing harder, sweating, neither of them spoke for a few moments.  His brows raised, Katie started thinking fast, "Dad!!  Can't a g-girl have a bit of privacy?!"

The older leopard frowned, looked at the growing puddle under her foot paws, then cocked his head curiously, "Katie, where's Tommy?"  He watched her eyes widen and get that look he'd know anywhere.. "I'm really curious, because I sent him up to have his bath an hour ago and there's no sign of him anywhere."

Katie stammered, looking around desperately, clutching her dressing gown tighter against her, feeling Tommy's warm trickle reach her exposed ankle, "Umm, umm, he is, that is, he, um, we.."  A soft splash made her gasp out, as Tommy came to his senses and had the presence of mind to cover his modesty in the bath.  Katie cringed, and turned her head slowly in his direction, trying to feign surprise.  

Dad gently pushed the door open all of the way and looked with an unreadable expression at Tommy in the bath tub, who by now had sunk as deep as he could, blushing like he wanted to disappear.  He nodded, "Thomas."  The leopard looked back at Katie, down at her soaking foot paws again, finally regarding her with a mixture of curiosity and annoyance, "What were you two doing?"

The question hung in the air like a ticking bomb, a terrible, awkward silence fell.  Katie couldn't meet her Father's gaze, mumbling guilty, "We were just playing.."

"Speak up Katherine.  Come on."  His tone suddenly held a dangerous edge.

She twirled one foot in a circle on the ground, briefly horrified to feel a slickness that was not water, breathing deeply and trying to be brave, "Tommy and I, we j-just, just wanted to do a science experiment!"  Her voice suddenly lifted, "That's right, at school science class there was this ancient Greek, Archie..  Archimedes!  Me and Tommy wanted to do his experiment."  At her Father's blank stare, she continued, nodding and growing more confident, "The experiment is, you get into the tub and see how much water comes out, and that water is, um, the size of your body.  The.. vol.. volume?"  He was nodding patiently, "Only Tommy wasn't enough by himself, so I said I'd help, see?"

Dad scratched his chin and pretended to consider this classical experiment performed by two such eager students.  He looked over at Tommy again, who shrank under his stare, ears flattening, "I don't see any water spilled.  A good job too, did you want to flood the house?"  His voice raised slightly.

Katie cringed again and tried to hide it, "Yeah, but, we were gonna fill the bath deeper, but then catch it in buckets 'n stuff."

He shook his head, gesturing expansively across the room with one paw, "Where are the buckets?"  Katie stammered, and he continued, looking more serious now, "And why were you hiding?"  Katie was blushing deeply now, stammering more, trying to find the words.  He looked her, how tightly her gown was held against her, how her upper half didn't even seem wet at all, how she was sweating.  After another awkward moment he shook his head, seeming to come to a decision.  

The leopard put his paw on Katie's head in an affectionate gesture, but looked seriously at her, then Tommy.  "I'd like both of you to get dry, get dressed in your night things, and then I'd like a word with you.  Without another word, he turned around and left, gently pulling the door closed behind him.

It was like an icy dagger had been plunged through her heart, Katie stood, frozen to the spot, her whole body gently trembling.  Tommy might as well have been in a bath of solid ice, feeling much the same.  They listened to the footsteps retreat into the distance, then their parent's door close shut with a click that made both jump.  With effort, Katie turned to look at her brother, she felt like she was either going to cry, or kill him.  The same expression was mirrored on his miserable face.  She nodded then, took a deep shuddering breath, and fled out the door to her bedroom.

***

"Now, your Mother has agreed that we all need to have a chat, with you both growing up so fast."  He looked from Tommy to Katie and back to Tommy, they were both sitting huddled on her bed with their knees up to their chests, faintly shivering.  Tommy wore Lion King pyjamas, Katie a mauve dressing gown done up tightly, they briefly glanced at each other in comiseration, then nodded miserably.

"Do you remember when you used to share baths when you were both younger?"

The cubs nodded, blinking slowly.

"You were 7 years old, both little children, it was nearly 5 years ago.  But Tommy, you're a big boy now, Katie, you're a big girl, and big boys and girls don't share baths.  Big boys and big girls don't have to go to bed at 7 either, they get to stay up till 10.  Would you like your bedtime to be 7 again?"

Both cubs shook their heads vigourously, but then Tommy started to speak, "B-but on holiday, we had to s-share.."  He yelped suddenly as Katie elbowed him in the side, hard.  Tommy glared at her.

Dad nodded after a moment, "That's true, but sometimes we have to put up with things we shouldn't do or don't want, for small periods of time.  Come on, do you want to be treated like cubs, or are you ready to be more grown up?"

They nodded unhappily, mumbling, "Want to be more grown up.."

He nodded, then paused for a moment, remembering Katie's wet paws earlier, he really needed to drive this home "Do you know why brothers and sisters shouldn't share baths as they get older?"  There was silence from the cubs for a few moments, was it a trick question?  He saw their uncertainty and shook his head, chuckling under his breath, "It's okay..  Now, which one of you can tell me the difference between boys and girls?"

They blushed, but Katie found her arm going up, suddenly keen to explain.  "Go on Katie."

She swallowed and suddenly realised what she had to say, glancing between the two males in the room, "Is it..  Is it, girls have a v-vagina, boys have a penis?"

He nodded gently, "Go on.."

"We learnt it at school years ago of course, " She started to sound more confident again, "Girls have a vagina and uterus and ovaries, so they can have cubs."  Katie blushed, "Boys have a penis, Tommy calls it his willy," She oofed at a sharp elbow in her side, "And testicles, and they produce..  They produce this seed, which goes in the girl, and makes a cub."  The girl squirmed a bit now, glancing away shyly.

"Very good Katie.  Now, young boys and girls can't make cubs, not till they're grown up.  But every boy and girl reaches a certain age, we call it puberty, where your penis and vagina start growing and working, and you start to feel new things."  He pretended not to hear a soft giggle, "It can be quite scary, your body changes, inside and out, as you start becoming grown up.  I think the two of you know what I'm talking about, yes?"  They nodded, a little too guiltily, not meeting his gaze.  He continued, "When boys reach a certain age, they start being able to produce sperm, or seed.  It starts with an erection, and sometimes, even if you're asleep, sperm can overflow and escape, your body has to get rid of it if there's too much."  Tommy was squirming now, tugging at his pyjama bottoms nervously.

He nodded with a very slight smile and turned to Katie, "This bit might gross you out Tommy, you can go to your room for a minute if you want."  Tommy shook his head and stayed put.  "Okay.  When girls reach puberty, they start having what's called their period.  Every month, an egg comes from your ovaries, waits in your womb, your uterus, and if nothing happens, it all gets flushed out and there's a lot of blood."  Katie's eyes widened, "It's nothing to be frightened of, your Mother can give you all the help you need."  He tailed off, somewhat uncomfortable with this section of the talk anyway, happy to be brief.  "Now, both of you, this is important.  Do you know what sex is?  What mating is?"  Tommy shook his head for a brief moment, then nodded, then Katie nodded too, reluctantly.

"Why don't I tell you, and you can check if you knew it already."  He licked his lips and gave a tiny squirm neither cub noticed, "When a boy and girl get old enough, when they've passed puberty, they might get together.  If they love each other very much, sometimes they want to be very close to each other in every way.  So, what happens, is the boy gets excited and has an erection, and puts his penis into the girl's vagina.  They can lay face to face, he moves it in and out, until it feels really good, and then the boy has what is called an orgasm, and puts his sperm deep inside the girl, the sperm produced in his testicles."

Katie interrupted, blushing hotly, "What about the girl?"

Dad looked confused, "What?"

"What about her, um, orgasm?"

He coughed and looked faintly embarrassed for the first time, "Oh.  Well, um, if the boy mates with her in a really nice way, then she feels really good too, and has an orgasm too."  Katie nodded with a faint grin, satisfied.  "So, once the boy has done this, his sperm goes deep inside her and if it's the right time of the month, it meets her egg, fertilises it, and then a cub grows, she's pregnant.  We're leopards, so about 5 months later, the girl gives birth to a leopard cub."  They both nodded, eyes wide, Katie squirming as certain ideas began sinking in.

"Now, when you both grow up, you should each meet a nice boy or girl one day
and this could happen."  

They feigned a disgusted look, poking their tongues out, "Really??  Eww.."

He nodded, grinning a bit, "You will."  His expression turned serious again, "But lets be clear about something.  Brothers and sisters do not mate with each other, not when they're older, not ever."

Katie suddenly looked hurt, stammering out a reply, "B-but why not?"

His expression hardened, "Because they don't.  Because they shouldn't.  It's not right, it's not natural.  So, do you see why I'm telling you all this?  Brothers and sisters do not share a bath when they're older, because they're growing up, they're beginning puberty, they're starting to be able to mate.  Brothers and sisters must not mate, a brother must never impregnate his sister, he can't."

"C-can't?" Katie replied.

The older leopard nodded, "He mustn't, it's not right, not natural.  Do you understand?"

Confusion filled their faces, but both nodded meekly, looking pale.

"So you're not to bath together again, because it wont be long till you're old enough, and that's when problems start.  I don't want to catch you two in the bathroom together again and that's the end of it, is that clear?"

Their ears flattened and the twins shrank away slightly, nodding again, "Mmmhmm."

He studied their faces for a long moment, before standing up.  There was going to be trouble, no doubt about it.  Dad headed for the door, then paused, turning around, "Goodnight Katie.  Goodnight Tommy.  Lights out in an hour please."

The door closed with a finality like death and the twins were left huddling and hugging their knees together as they sat fully on the bed in the dim room.  In Katie's bedroom.  Katie looked at her brother, his face was ashen, words played across his lips before he could finally voice them, "P-pregnant..  C-cubs..  Put my seed in you.."  He swallowed and looked panic stricken.

She shook her head and gripped his shoulders firmly, "Tommy Tommy Tommy, you didn't listen, didn't you hear what he said?"  He shook his head.  "Dad said brothers and sisters can't get pregnant.  Can't!  Besides, I never had my first period anyway, so I'm not even ready yet."

He looked doubtful, but a little relieved, she nodded at him, "But Katie..  He said it was wrong.  Unnatural.."  He sniffed a bit and looked guiltily down at his paws.

She took them and held them in her own, looking up and into his eyes, "Did it feel wrong?  Did it feel unnatural?"  He shook his head, unsure.  Katie held her gaze, "Do you love me?"

Tommy blushed, but then looked a little upset, "Of course I do!  Of course I do, Katie..  I love you, it's just..  I got so scared, what if he'd...  What if he.."

The girl shh'd her brother gently, brought his paws up for a kiss, "And what did Dad say about when a boy and a girl love each other very much?"

His eyes crinkled slightly and for a moment his sister thought he might cry, "S-sometimes they want to be close to each other in every way.."

She nodded and smiled with a bit of pride, "I think you proved that to me Tommy, quite a lot of times.  How can that be wrong?"  Tommy smiled back and she continued, "Okay it was close tonight, I admit, I was scared too..  But you gotta admit it was kinda fun too, would have been even more fun if we'd not been interrupted."  He nodded reluctantly, and then she shuffled closer on the bed and pulled him into a sitting hug, their knees and his paws trapped between them.  

Tommy let out a soft murmur of pleasure and their muzzles met, gently kissing.  He found his paw wandering as the embrace softened, lower, lower, snaking gently into her robe, she didn't acknowledge him or stop him.  The cub's fingers brushed her soft white tummy fuzz but kept feeling, lower, lower.  His prize awaited, as a paw finally brushed over her soft mound, making his sister give a little gasp.  He licked his lips and felt with one finger, finding her special fold, finding it slippery.

Katie couldn't stand it any more, wrestled with the cord and then flung her dressing gown open. She came even closer to Tommy, parted her legs around him and stretched them out, shuffling nearly into his lap in a sitting position.  It was her turn now, she spread his legs next and laid them down either side of her, so they both sat facing each other with their legs intertwined.  Tommy blushed as she ran a naughty paw down his chest, his tummy, the pyjamas in the way of course.  Katie pretended not to notice the way they were bulging out down there now, as she very gently slipped a paw under his waistband.  Tommy gave a little gasp, then a louder one as her fingers found their quarry, curling slowly around his sheath.  They were very close, muzzle to muzzle now, soft breaths rippling the short fur on each of their faces.

Tommy's mouth hung open slightly, paws going limp as his sister felt him up, he whispered distractedly, "Katie.."

She nodded and gave him a soft lick, "Shhhh..", as another paw reached down, under the waistband, brushing past his firmness until she found his sweet balls and cupped them.  The fur bristled in her paw and he gasped again by her face, Katie nodded again, reluctantly let both paws go, then began to unbutton him.  It only took a moment before he spilled out, free of the soft fabric, she managed the final button and then gently moved her paws out of the way.  Katie let out a low growl of pleasure, of anticipation, as she let go of Tommy, reached behind his back and pulled them together the rest of the way.  They both grunted, Tommy's eyes widened as he found himself fully in his sister's lap, pressed together in the most special place.

With no preamble she reached down and grasped his erection, easing it down a little way, a little more, and then smoothly guided her brother into her.  He groaned, she hissed softly, that slick feel as his lovely penis slid deep into her never got old.  She kissed him, and then hugged him tight against her, giving another soft growl at the sweet intimacy of their embrace.  Tommy was panting as his arms found their way round her back, and he hugged too, pushing a little with his hips now.  She was so warm inside, so slick, from his sperm less than an hour ago.  He was so stiff and smooth.  It was the best hug they'd ever had.  Slowly, gently, they began rocking against each other, brother and sister, intertwined and interbreeding.

"How unnatural does this feel?" Katie whispered breathlessly in his ear, a touch of mischief in her voice.

He grunted, rocking in sweet ecstacy for a while, paws wandering down her back, "Very.. unnatural.." he said in a shy voice, it almost came out as a squeak.

She nodded with a wide grin, rubbing his back, "Mmmhmm.  You know what would be even less natural, Tommy?"

Tommy blushed as he let one paw stray down to Katie's buttock, pretending it never happened, pushing gently in and out of her, in and out, "No..?"

The girl murmured softly and rested her head on his shoulder, flicking her tail up, "It would be terrible, if my own brother put sperm from his testicles, deep inside me."  He gave a strong surge and they both groaned, she felt him tremble and pant a little louder against her.

Tommy said nothing for a long time, not trusting himself to speak, both paws found themselves rubbing Katie's bottom now.  He hesitated, shy, but then slipped one under her tail, brushing the smooth sensitive skin, she breathed in sharply.  Lingering but a moment, he reached lower, then found the base of her slit, spread open around his intrusion.  As they rocked, as they moved, he could feel it, filling her, spreading her, he split his fingers round it and thrust between them.  Trembling, he tried to frame the question, "How does it f-feel, Katie?"

She was almost in her own dream world, eyes closed, trying very hard not to lose it at the sweet attention, "Mmmm?  What exactly, Tommy?"

The boy blushed more, swallowing, "H-how does it feel, when I..  When I put my seed in you?"  He groaned and twitched hard, it wouldn't be long before she'd feel it again.

Katie opened her eyes, bit her lip, where to begin?  "Oh Tommy, it feels, um.."  She was blushing, despite herself, heat filling her cheeks, "I feel you..  I feel you pulsing in me, twitching again and again, you kinda swell up.  And then.."  Their rocking had grown more purposeful, more focused, both pushing harder against the other, "Then suddenly I feel the wetness, your wetness, I feel it splashing really deep, so wet..  And warm!  Oh Tommy..  I wish you could feel it, when you start squirting in me, I wish it could keep on going forever.  Like in the shower.."

He whimpered, tail flicking up, feeling and rubbing their connection with both paws now, eyelids fluttering, "K-Katie..  I..  I have to put all my seed in you again, right now, I can't..."  And then he stiffened up, breath caught in his throat, straining, until with a shudder he started breeding Katie, one wet squirt after another splashing, spraying against her vaginal walls.  They hugged as tight as they could as brother filled sister, helplessly, lending her his fertile warmth.  Her cervix twitched and spasmed as the warm gush tried to breach it, but it held fast, holding its secret now, weathering the sticky rain.  Somehow the naughtiness of the situation spurred Tommy on, a lusty groan rising from deep inside while he hunched and panted and did everything he could to empty his balls into Katie.

She leaned back slightly, trembling, kissed her brother on the lips, then the eruption began in her vagina, deep pleasure pouring and splashing through every fibre of her being.  Katie whimpered at the relentless squirts from her brother, at the warmth, at the fact she knew for sure now he was trying to impregnate her.  Suddenly she gave a cry and tipped her head back, breaking the kiss as another explosion of pleasure rocked her groin, a second intense peak.  The feelings rippled through her till she thought she might faint, Katie tried to blink, and saw Tommy gazing into her eyes.

The boy grunted, deep in his own world of ecstasy, but looked at his sister, "I..I love you Katie."

Her eyes went wide, she hugged him as tight as she could, then a devastating third orgasm slammed through her nerves.  The cub mewled, shivering, panting, trembling, gasping, Tommy's semen was overflowing and she felt every sticky drop.  Needed every drop.  It was like she was stuck in a never-ending moment of time and maybe she'd die if it didn't end, but Katie didn't mind.  They both grunted as she felt Tommy push and nudge himself even deeper, felt the jets of his semen wash even harder against her tight cervix, and then a fourth explosion tore through her.  Already frayed nerves were ripped apart, Katie gave a soft cry with every spasm of her body, again and again, and started to really feel faint.  Her arms fell and she toppled backwards onto the bed, bringing Tommy with her, he ended up almost squatting on top with their legs tangled.

Katie's eyes fluttered and with effort she gazed back at Tommy, forming words with some effort, "I l-love you too, T-Tommy.."  They closed then and she laid there, her whole body twitching and spasming under her brother, drool leaking from the side of her mouth.

Tommy let out a long breath and then collapsed onto Katie, disentangling his legs so he could lay flat, shivering in the afterglow, savouring every sensation.  He blushed a bit too, what had he done to Katie this time? Tommy knew she felt something the same as he did, but this had seemed something quite a bit more.  These and many other thoughts flitted through his head, as both cubs fell asleep.

***

Tommy awoke gently, mrowling softly, everything felt very pleasant and of course his willy had woken up before him.  With a slight jump he realised he was laying on top of his sister, and then the memory from earlier came flooding back and he gave a soft grunt of pleasure.  With another jump the words of his Father came ringing in his ears from earlier, he was still in her bedroom, what if they got caught?!  Slightly panicked, he turned his head to look at the soft glow of the bedside alarm clock, and immediately relaxed as he saw the time less an hour later than before.  The bed felt damp under them, he blushed, it seems they had made a mess.  The bed wasn't the only damp thing though, Tommy shifted slightly and felt his erection laying stiffly against his sister's slit, it was fuzzy and warm and wet.

He shivered, it would just be so easy to...  The leopard trembled with excitement as he moved his body lower, felt his tip sliding down, down, and then pushed.  It caught in her, just as it was meant to, so he moved up and slid all the way inside, where he belonged.  She was so full of his sperm, it clung to him, clung to her, making that unique squeaky slippery feel.  A deep groan rose in his throat, he shuddered, footpaws clenching and unclenching, then his tail raised up high and started to flag.  Tommy laid his head sideways and started putting a fresh batch of seed inside his sister, gasping as quietly as he could, straining as the release took over his body.  There was no room for any more, never was, but he ejaculated anyway, full of youthful vigour.

The bed got a little damper while Tommy tried impregnating his sister, lost in a world of sweet joy.  Eventually though, he did run dry, and then laid there again, on top of her, drifting away.  But no!  Tommy struggled with huge effort against the sleepiness, he had to go, had to go to bed, it was simply too risky.  Blinking sleep out of his eyes, he reluctantly pulled out of Katie and clumsily sat up on the bed.  Tommy looked down at Katie then, blushing, needful, but before he could change his mind, he carefully swung his legs round and dropped to the floor.  She was still asleep, beautiful, delicate, sensual, and his.  Her legs were spread apart and he could see the damp stain on the sheets where their fluids had leaked.  He could see it leaking right now as he stared between her legs, she was still spread open a little from his intrusion and soft pearly droplets gently oozed down her lips.

The blush didn't fade, and neither did his erection, but he had to go to bed.  Shyly, he approached her, stared at her sleeping face that seemed to be smiling, then dropped his muzzle down for a kiss.  Unable to help himself, his paw wandered to the side and then touched her while he kissed, rubbing up her slit, digging one pawfinger a little way inside.  Deeply embarrassed he pulled away suddenly, started moving towards the door, one paw very wet now.  Tommy found it, opened it, and made his escape, but not before staring back at Katie and whispering, "Love you sis."  The cub remembered to do up his pyjamas, then slunk back to his room, crawled into bed, and fell deeply asleep.  Katie rolled onto her side and murmured, slipping her paws between her legs, never waking up.  

Some time later a figure crept into the room, switched off the lights, checked in on Tommy and did the same.

