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Nobody questioned the oddity of Kate and Mark living together. They had always gotten along better together than with any of their friends. They had arguments, and cruel things were said sometimes, but mostly they bordered on angelic. Twenty-three years together hadn't made them care about each other any less.

A pair of Dumbo rats with rich black coats, Mark three years the junior of Kate, they made the choice to live together after completing high school. They split the chores down the middle; they had friends and guests; Mark cooked wonderful meals and Kate was teaching him how to drive - a skill he had never bothered to pick up. Their life was idyllic although their pairing was strange, but mom and dad never thought of them as such. They acted normal.

Because, to them, their life was normal. They didn't pretend to be lovers, because they weren't. The fact that they had sex was clandestine in its own way, but only to the point that it was never acknowledged.

"Mark, hey - you busy?"

He looked up from his laptop - he was very proud of his current cookies-per-second in Cookie Clicker, which he'd been building up for months - and saw his sister in the patio doorway. She was damp, her ample assets snug in a red one-piece bikini. A baby blue towel was slung over her shoulder. Although interested, Mark let no lewdness creep into his face or his voice. "Yeah, what's up?"

Kate smiled. "The water's fantastic, you oughta come swim! Your trunks are hanging up in the closet."

"You know I don't like swimming," Mark chuckled.

"More like you want to just play that stupid game," Kate shot back. "Don't even try to tell me you're working, I know you way too well for that."

Mark scowled, blushing. "Go splash in the pool and leave me be, would you?" Kate turned and left, laughing. Mark took a longing look at her plump bottom as she went outdoors, the contrast of the light obscuring her quickly. He was getting hard, and cookies were getting boring. He set the laptop aside, plugging it in on the coffee table, and walked to the door somewhat stiffly. "Hey sis?"

She caught sight of him at the doorway and splashed water at him. It hit the deck near his feet, making him flinch and her chuckle. "Yeah? You change your mi-i-ind?"

"Of course not," Mark huffed. "I'm gonna go and take a nap. All right?"

Kate, face suddenly wan, licked her lips. "Think you need one? You slept in this morning."

He smiled. "I'm feeling really sleepy all of a sudden. Try not to be too noisy."

Mark pulled the blackout curtain across the window and peeled back the covers. Naked save for his briefs (purple with black edges, Kate's favorite colors), he laid back in bed and sighed. He didn't feel the least bit tired.

Hardly ten minutes later, with fur still damp and freshly rumpled by a vigorous toweling, the chubby beauty Kate tiptoed into the bedroom. There lay her younger brother, sprawled and allegedly snoozing. She smiled and knelt on the bed, her weight pulling down the mattress, making Mark shift. She wasn't concerned with waking him up. He was, she often noted with no irony, a very heavy sleeper.

Kate caressed the hump of his penis, tail wagging, slinging tiny droplets of water onto the carpet. She loved the purple ones so much.

Under her touch, Mark's member filled out. Its length seemed to grow under the taut canvas of the briefs, and she slid her fingers up toward the waistband. A smear of precum began to ooze into the fabric, adding musk to the wet fur smell dominating the bedroom. Kate licked her lips as she pulled up Mark's briefs, tugging cautiously downward to expose his thick pink meat. Its rounded head oozed precum along his pubic mound, and soon his belly.

Sometimes Kate liked to sit on it; sometimes she licked his asshole and stroked him. Today her brother was enjoying just a quick nap, and she felt her efforts should be suitably brief and tidy. She leaned lower, breasts hanging alluringly in the clutches of the bikini - if only Mark had been able to see them.

Mark's balls in one hand and its twin braced on the bed, Kate brought her soft lips to her brother's waiting shaft and took it in with no hesitation. She licked and began to suckle, coaxing the flesh to harden more and more, soon enough that it neatly filled out her short muzzle. She reached up without really paying attention, looping her thumb and forefinger around the base before giving it a squeeze, making it throb and her snoozing brother shudder.

Kate's tail swished as she blew her sweet little brother. The bitter-salty flavor of his precum made her tongue tingle in a way as familiar as it was wonderful, and under the bikini, her muff throbbed and drooled. She dared to reach down and touch it, fingering herself through the slightly damp fabric. It had been just that morning that she'd ridden his meat and climaxed on it, and already she wanted it there again. She could still taste her own distinct flavor on his penis.

The pretty rat pushed her snout lower, letting her teeth drag softly on the flesh. She wrapped her tongue around it, squeezing and tugging in a way her sleeping brother deeply enjoyed if his moans and soft squirming were anything to go by. Sometimes, in his supposed sleep, Mark was known to fondle and squeeze her. She was disappointed his present dreams weren't quite so vivid.

In lieu of her brother's unconscious touch, Kate slipped her fingers around the border of her bikini and dug her fingers into herself. Soft shivers passed through her body, ending with a wiggle of her tail. A smile on her face, she shoved down her pretty muzzle until her nose bumped his narrow hips. Several deep sniffs drew his scent far into her body, where his pheromones easily worked their magic on her. Sealing her lips around his penis sloppily at best, she started to suck, and so did she start bobbing. Mark softly squeaked. It was an utterly blissful noise.

Kate slipped her fingers free, the flesh damp with honey. She brought them up, pressing them to her brother's lips and smearing them across the flesh of his nose. Instinct - maybe a desire to suckle from mother again, she thought - saw him open his mouth. He let her fingers seat against his tongue before he sucked on them.

Precum continually drooled from Mark's cock, but sometimes it shot against the palate of Kate's mouth. No matter how quickly it came, it was always welcome. Thick and notably musky, it conveyed his pheromones in a way she could taste - much like the secretions she smeared across his tongue, although her fingers were cleaned by then, the honey replaced by slobber. She still kept them there, chancing gentle presses on her brother's slurping tongue, knowing from experience how he liked a little oral stimulation in his sleep.

When Mark slept in, his morning wood was quite tough to beat down. She had ridden him for the better part of an hour that morning before he finally shot his wad; but the midafternoon naps were never anything more than quickies. It was just how he was, and she understood that and even enjoyed it. Like the deprived sleeper's body reconditioning itself to get as much REM as possible, Kate packed in as much pleasure into Mark's brief siestas as she could. She sucked on him hard, grinding his penis into the firm ridges of her palate, sandwiching it between that and the delicate softness of her tongue. The sleeper panted around her invading fingers, bucking awkwardly, fingers and toes curling and uncurling again and again. He was close, and she could tell as much from his body language as his smell.

Kate pulled back her fingers but did not touch herself with them again; she slipped them under her brother's heavy ballbag and prodded the pucker of his anus. He emitted a very brief but telling gasp and bucked more sharply into her maw than before. Kate, smiling and knowing what a heavy sleeper her brother could be when a climax was just upon him, eased one finger into his body. She sank it slowly but implacably until it was buried to the knuckle, riding on a coating of saliva. She performed no acrobatics with it, and there was no need to when a simple, single digit holding her brother's asshole open was enough to make him pop. It was something she knew from experience.

Mark shuddered, almost breaking the facade of sleep as he shot his load. A deep and abiding groan shook out of him and his countenance was briefly a painful one when he clenched on his sister's finger. (He was not, as she liked to tease him sometimes, an anal kind of guy.) Two fat ropes of cum shot into her mouth, a dribble following them, and that was it for the rat whom had already dumped his nuts deep into his sister's snug box that morning. He fell slack, huffing through his nostrils with each breath. He felt like actually sleeping at that moment.

Slowly and with much satisfaction, Kate drew back her muzzle, finger a moment later. She slithered her plus-sized body over his and pecked his cheek with a wet smack. "Mmm... I think I'm gonna take a nap now," she murmured near his ear, slipping gracefully off the bed and onto her feet. She left, hips swaying, and Mark surreptitiously opened his eyes to see it happen. The show was, of course, for him.

A real snooze could wait. His sister's delectable body couldn't. He slipped out of bed himself and yawned. It was time to give his big sissy some sweet dreams of her own.