Zen sighed at the blank worksheet staring back at him from atop his bedroom desk.  No one had noticed, or at least said anything about the nearly invisible stain on his shirt during school.  Neither Limra or Ivi mentioned anything about what happened that morning on their walk back home, or even acknowledged his existence.  It was all he could think about.

They hadn't been home long when Ivi slipped into his room.  Zen jumped, spinning to face her.  She hadn't changed yet, still wearing the black skirt and gray blouse of her school uniform.  He changed the moment they got home, more to scrub the dried cum from his fur more than anything.

Ivi rolled her eyes.  "Try not to look so desperate, jeez."

Zen blushed and glanced at the door Ivi shut behind her.  Their parents were home today.  Ivi glanced around Zen's room, then examined him with a calculating look.  Zen held his breath in anticipation, already feeling his body responding to her presence.

A grin spread across Ivi's lips.  "Get up."

Zen's heart raced.  He jumped up from his chair and moved out of the way as Ivi spun the chair towards him, then plopped into it.  Zen fidgeted nervously in an attempt to obscure his growing erection.  His shorts offered little help.

"Take your clothes off," Ivi told him.

"W-What?  All of them?" he squeaked.

Ivi chuckled.  "Of course."  She was so pretty.  Zen felt compelled to obey her request, yet anxiety nibbled at his desire.

"What if Mom or Dad come looking for one of us?"

The way Ivi's head twitched towards the door didn't inspire confidence, and her grin faltered for just a moment.  "Better hurry up then.  You're good at that."

Zen bit his lip, stalling.  "Are you going to take yours off?"

"We'll see."  The way she grinned at him set his stomach fluttering into his chest.

Yesterday, Ivi had undone his pants.  All Zen had to do was let it happen.  Removing his own clothing felt far more involved, especially as Ivi watched intently, silently judging.  Zen let out a nervous whine before he could stop himself, then pulled the t-shirt over his head.

He waited for laughter that never came, for Ivi to taunt him, disbelief that he actually did it.  She watched in silent interest, her black eyes darting across his bare torso, then waiting for him to continue.  It took a moment to work up the courage to slip his shorts from around his narrow waist.  They fluttered to the floor, exposing his gangly legs and leaving him in nothing but his boxers.  The black underwear barely contained his little erection.

"Those too," Ivi cooed.

Zen wasn't quite sure he liked the way his fraying nerves only further excited him.  His cock twitched against his underwear, and he shivered under Ivi's focused attention.  Zen took a deep breath and carefully extricated himself from his boxers before letting them join his shorts around his ankles.

His hands wavered by his sides.  He knew Ivi wouldn't want him to cover himself like instinctive fear wanted.  Embarrassment tickled his belly.  His slim pink cock bobbed in front of him, already free of his sheath.

Ivi sat forward in his chair and beckoned Zen closer, her eyes glued to his crotch.  Zen's breath caught in his chest, and he had to squeeze his eyes shut for a moment to suppress the sharp stab of pleasure welling up from the space between his legs.  The thought of cumming just from Ivi looking at him sent a confusing thrill up his spine that nearly made it happen.  He shuffled closer until Ivi placed a hand on his hip to stop him.  Zen squeaked, but Ivi paid him little attention.

She closely examined his tapered shaft, letting him feel her breath against its slender length, barely thicker than one of her delicate fingers and perhaps four or five inches long.  He'd never measured.  The tip of his cock leapt upwards when Ivi let the hand on his hip drift lower.  Her fingers tenderly curled around his balls.

"How cute," she mused, cupping his small pouch in her palm, fingers exploring the soft short fur that covered his sack and the small orbs within.  "I've heard they're very sensitive?"

Zen squeaked, his petite butt clenching, pleasure swirling into his belly.  His sister casually fondled his balls.  He couldn't manage to form words and simply nodded.  With all the clenching, a tiny half-bead of precum formed at the tip of his cock.  After a thorough exploration of his anatomy, Ivi leaned contemplatively back in the chair and watched his dick twitch.  Zen fidgeted in the uncomfortable silence.

"Get on your knees," Ivi said after a time.  A soft rosy warmth colored the insides of her large ears, and her tail curled around the leg of the chair to keep from twitching, but she stared back at him with a confident grin.  Zen dropped his eyes then awkwardly knelt before her.

Ivi gathered the hem of her skirt closer to her body then pat her thigh.  "Put your head here."

From his new vantage, Zen could just barely not see anything beneath her skirt.  She didn't cross her legs, but the soft yellow light of his desk lamp lit Ivi's back and did little to reveal the shadows hiding what lay beneath.

Silky gray fur mottled with brown covered her slender thighs.  Zen hesitantly shuffled forward.  His shoulder stiffened when Ivi cupped the back of his head, instinctively resisting the slight pressure coaxing him towards her.  He relaxed, and Ivi guided his chin to her thigh.

Her body felt hot against him.  Sleek fur warmed his cheek, and Ivi stroked the back of his head fondly.  A faint citrus perfume mixed with a far more personal scent of fur and flesh, clean and alive.

"You really do just as you're told, like a well trained pet," Ivi mused, scratching the back of his ears.  "Such a good little rat, aren't you?"

A confusing torrent of emotions sent pleasure burbling into the depths of Zen's belly.  Pride?  Why would he feel pride, or the elation dancing throughout his tensed muscles?  Why did he want her to call him a good little rat again?  Zen panted against Ivi's thigh, his breath rustling her fur.

Her foot brushed against his knee, then she shifted, careful not to dislodge him from her thigh, her hand stroking the back of his neck.  The hairless top of her foot rose up the inside of his thigh before finding his belly.  Zen squeaked, but Ivi shushed him.

"Relax."  Her curled toes massaged his belly before extending lower.  Zens cock nestled between two of her toes, his sensitive shaft brushing the sole of her foot.

Without thinking, Zen clutched Ivi's thigh and jerked forward, hips trembling at the shock of pleasure expanding from his pelvis.  His claws dimpled her soft hide beneath the fur, and he whined through clenched teeth.  Ivi barely moved, the base of his cock trapped between her toes, but she didn't need to.  His cock twitched in pleasure, lifting his thin shaft against the supple sole of her foot, the wonderful sensation compounding until it spiraled out of control.

Ivi took his head in both hands.  "All ready?  Good boy.  Go ahead and cum for me."

He was.  Zen muffled a cry in her soft fur, hips bucking against her footpaw, his cock jerking up against her sole to surrender his meager release against her warm bare skin.

"Such a good boy," Ivi whispered, stroking his head through the throes of his powerful orgasm.  "You're actually pretty cute when you cum."  Zen panted hard, clinging to Ivi to keep himself upright, a gasp of satisfaction ringing from his chest.  Ivi let him rest against her thigh until he caught his breath, but then nudged him back.

Zen's cock slunk back inside his sheath and out of view, but an excited shudder rippled through his belly when Ivi lifted her leg.  With her leg raised, and the black skirt already drawn back, Ivi offered him a perfect view of her delicate white panties, the thin fabric hugging her body and hinting at the cleft between her thighs.

Then her footpaw rose in front of Zen's face, his mess covering the soft pink sole of her paw.  The thinner watery fraction of his cum dribbled down her heel, but the thick cloudy white mess clung to the ball of her paw.

"What are you waiting for?"  Ivi thrust her paw right in front of his face, her teasing voice hiding a giggle.  "This is your fault, isn't it?  You're not going to just leave me like this are you?"  Her long slender toes wriggled gently curved claws before his eyes.

Such a recent orgasm left his interest depressed by the satisfied haze clouding his mind, but he couldn't explain the why he found the sight of his cum glossing the bottom of her paw so intriguing.  He absolutely didn't want to do do what Ivi implied, the thought of licking his own cum made him blanch, yet he couldn't pull himself away and disappoint the expectant look on her face.

Ivi's foot trembled slightly from the effort of holding her leg up.  She inched her pink hairless paw closer until Zen had no choice but to overcome the paralyzing combination of embarrassment, hesitation, and desire, or let her smear cum across his snout.

Zen took her heel in his hand.  Watery ejaculate wet his palm.  Why was he doing this?  Why couldn't he stop?  Zen squeezed his eyes shut and gave the underside of Ivi's footpaw a lick, then recoiled in disgust.  Every aspect of semen was gross.  The salty bitter taste felt like it burned his tongue, which the viscous fluid clung to.  Trying to swallow it only ended up spreading it around his mouth until it was all her could smell or taste, a film of it coating his throat.  But Ivi purred, the look in her eyes quelling the part of him that urged him to refuse.

Zen wrapped his other hand beneath her calve to better support her leg and silenced the upset twinge in his belly.  Cum flowed around his tongue, forcing him to lap at her paw to clean it.  Ivi shivered in response, and he heard the occasional gasp, her paw twitching to accidentally smear cum into the fur around his lips.

It didn't take long to clean her, even including the thin trails that leaked down to her heel.  His tiny balls didn't produce much.  When he relaxed onto his haunches, he found himself erect again.  Ivi giggled and pushed her paw against his face, forcing him to nuzzle into it.

"Wow, you'll really do anything I tell you to, huh?"  A wicked grin lit up her face, and Zen shrank back in embarrassment.  He wasn't sure he liked the way she said that, especially considering it was probably true.  What wouldn't he do if she asked and turned that mischievous smile on him?  The heavy taste of his own cum lay thick on his breath, his mouth slimy.  So caught up in his own inner turmoil, Zen forgot to sneak one last look beneath her skirt before she let her foot rest back to the ground.

Ivi gracefully dropped onto her knees from the chair, landing like a prowling cat, the look in her eyes hungry.  Zen squeaked and tipped back, catching himself on his hands, but Ivi crawled forward, forcing him backwards until he lay naked with her still clothed and looming over him.

The hem of her skirt brushed across his throbbing erection.  She grinned down at him, their snouts nearly touching.  "You smell like cum," she whispered, and Zen shyly turned his head aside, but she left him nowhere else to retreat, her hips hovering directly over his small cock.

For one hopeful moment, Zen thought she might take his virginity.  She had all but offered the other night when she snuck into his bed.  Feeling her body, the heat of her pussy against him had overwhelmed him to silence, and she'd been right.  He could never bring himself to ask.  Ivi cupped his cheek in one paw a thumb caressing his muzzle before encircling his snout, holding his mouth shut.  Zen whimpered, her claws gently raking through short brown gray fur before releasing him.

The tip of her tail curled around one of his thin legs as she crawled forward, her knees pinning his arms at his side, then sidling forward until her skirt crested his chin and plunged Zen into humid darkness.  Her hips lowered until he could pick the tantalizing scent of her wetness over the lingering musk of his own cum.

Soft cotton warmed by the heat of her body and slightly damp with lust touched the tip of his snout.  Her hips tensed, jerking away before settling back to cover his nose, leaving him no choice but to breathe against her covered pussy.

Zen had no real comparison for her scent, clean skin with a faint wet sharpness perhaps, but it lit up every nerve in his belly which could signal desire.  Ivi's hips danced against him in search of the best position to grind against his face.

Trapped between her thighs and at the complete mercy of Ivi's body above him, Zen held still, not sure of anything else he could do.  She gently humped every inch of his face that her adept hips could angle herself towards, rubbing along his chin, letting his snout prod between her thighs, thin cotton stretching upwards into wet radiant warmth.

Zen squeaked when her tail brushed between his thighs to caress his small balls.  Her smooth muscular tail brushed alongside his erection, wriggling beneath him, curling around his base.  Ivi pressed her hips more insistently against him, her movements becoming less fluid and increasingly eager, a paw reaching beneath her skirt to grasp the top of his head.

Ivi breathed hard, her tail writhing without purpose atop his belly, but even the incidental contact quickly swept Zen towards another orgasm.  The hand beneath Ivi's skirt shifted away from the back of his head for a brief moment to reach between her thighs and pull aside her panties.

When she sank back down atop him, sodden heat spread around his snout, letting his nose part her silken wet lips.  Slick fluid matted Zen's fur, smearing between their bodies, her own fur not spared by her indiscriminate wetness.  Ivi humped his face with renewed desire, hips curling quickly up against his chin before slowly spreading herself around his snout.

Zen tried to reach out and taste her, but she moved heedless of his shy attempts to help, but she couldn't fully deny him.  Her intimate taste mingled with his own on his tongue.  He wished he could savor it, lap at the enticing supple embrace of her lips, see her delicate folds glistening for him to explore.

Claws tightened on the back of his scalp, but Zen writhed in a discordant rhythm.  Ivi's tail stroked him, pressed the base of his cock to angle him straight up into the air.  The tip of her tail curled around his balls, the faint tremor of anxiety at each light squeeze only hastening the inevitable.  Her tail released him only to explore the cleft of his petite rump.  Her tip caught against his tight sensitive pucker.

Ivi's pussy muffled the short squeal he let out, pleasure swirling his pelvis into a whirlpool of ecstasy that sucked him under.  Claws bit the back of his scalp, and Ivi's hips crushed against his face, her thighs clenching around his head as a faint warmth fell across Zen's belly.  Her relentless grip forced the tip of his nose into a ring of fluttering muscle as she humped his face.

Awareness floated through a breathless pool of satisfied warmth.  His cock twitched lazily, dribbling the last few drops of cum onto his stomach.  Ivi's body slowly relaxed over him until her weight no longer held the tip of his nose at the threshold of her entrance.  She whined in pleasure then sat heavily onto Zen's chest.

A shock of cold air chilled his wet muzzle, fur matted heavily around his snout but Ivi had marked him from throat to forehead.  Lidded black eyes peered down at him in satisfied exhaustion.  Ivi giggled and combed patterns into his matted fur with her claws.

Ivi wriggled lower onto his belly then leaned forwards.  A paw rest lightly on his throat, her fingers brushing his cheek.  She leaned in and gently licked along the length of his muzzle.  Her tongue did little to remove the mess, but Ivi exulted at her own taste, eyes drifting shut.  Zen couldn't blame her.  Even panting as he was, lust drained from his balls, each breath teased him with a fresh reminder of her scent.  He wanted more.

"I hope you enjoyed yourself," Ivi whispered into Zen's ear.  "Because you're going to be doing a lot more for me from now on."  She nipped his bottom lip.

Their mother's faint shout from downstairs calling them for dinner left both frozen in momentary panic.  When no footsteps ascended the stairs, Ivi at least relaxed, a sultry chuckle releasing some of the tension from her chest.

"I hope you're still hungry."  She peered down at him to admire the aftermath she'd left of his face.  "You might want to clean yourself up."  With one last wicked grin, she pat him on the cheek and stood, readjusted her panties, then scurried off to her own room, easing the door shut with a soft click behind her.