"You you wanna fuck, Sis?" Tommy croaked.
"Sure, I wanna," she replied. "Only I guess maybe we shouldn't go all the way together being as we're brother and sister and all!"
Then she gave him a saucy smile. "But you can fuck me up the ass," she said. Tommy looked shocked at his kid sister's depravity but not at all reluctant. And her point was valid. Ass-fucking wasn't like cunt fucking, he reasoned. It was really the same thing as a blow-job except he would be squirting his jizz in to her digestive tract from the other end.
"Wanna?" she chirped.
"Yeah!" Tommy enthused.
The nubile girl dropped down on all fours, her head lowered almost to the floor and her trim, curvaceous little ass hiked up to the highest point of her posture.
Tommy knelt behind her ass.
Placing his open hands an her ass-cheeks, he pulled the smooth globes open, exposing the puckered brown bud of her tight little shit-hole.
His cock was already oiled and lubricated by her saliva and he bent down and began to lick out her asshole, getting that tiny slot ready for his reamer.
Belinda squirmed happily, shoving her ass back, enjoying having her brother rim out her shit-slot. He slobbered and slurped in her tight ring for a few minutes, juicing her up for his plundering prick.
As she watched them through the one-way mirror, Jenny was fingering her own asshole, wishing it was her son's cock buggering her. Then she licked her finger, pretending it was still Tommy's cock and that it had just come to her mouth out of her daughter's asshole.
Her cunt was creaming time and again, but she just couldn't get satisfied on her own hands, her voyeur's lust making her insatiable in her cunt and ravenous in her mouth.
Tommy gave his sister's asshole a last slurp, then rose up and moved in closer. His cock angled up, pressing into the crack of her ass as his flat belly rested against the curve of her cheeks.
He humped, stabbing his cock up and down through her ass-cleft just as he previously had pumped it through her smooth tit-cleavage.
His cock-knob loomed out over the small of her slender back and his balls dragged through her creamy crotch. She shoved her ass back, grinding against his loins.
Tommy frigged his cock-meat through the crack for a few moments, then he drew slightly back and biked his own ass up so that his cock was no longer angled upward but was pointed directly at her tiny little asshole.
"Ummm," she sighed, in anticipation of an assful of her brother's shapely cock.
Tommy stared down, opening her cheeks in his hands. His fat purple cock-head was flaring in her shit-slot and the youth looked rather dubious. He wasn't at all sure that his bulging knob was going to fit up that, narrow crack.
But Belinda had no such doubts.
"C'mon stuff it up me!" she whined.
He began to push steadily as she wriggled back against his smoking-hot slab. Her asshole rippled and parted to accept his thick wedge. The slimy tip of his cock-head wedged into her asshole, stretching the pliable bud.
With a soft suction sound, Tommy's throbbing cock-knob vanished in his sister's asshole. He paused, thinking that he might be hurting her, or worse, in danger of skinning his cock in that tight tunnel.
But Belinda squirmed back, screwing her ass against his rock-hard cock. It did hurt just a little, but the faint tingle of pain only enhanced the pleasure, adding another dimension to the thrill.
"Shove the fucker in," she moaned impatiently.
Holding her by the handles of her hipbones, her brother pulled her haunches back and began to cram his thick cock-shaft up into her shit-chute.
His knob was the widest part of his prick and as it slid deeper, it was opening her asshole, blazing a trail for his stalk to follow.
Inch by inch, his cock-meat sank into her guts. With a sudden lurch, he plunged in to the hilt, burying his prick balls-deep up her ass. He grunted, then moaned with the sensation as her shit-chute began to work on him, pulling and dragging as if she were trying to digest him in reverse.
Her whole was swallowing on his stalk just as her mouth had done earlier, the inner rings clamping and clinging to the contours of his cock. Both ends of Belinda's alimentary canal seemed interchangeable as fuck-holes.
Belinda wriggled happily on his hot spike, loving the satisfying sensation of being stuffed full. His cock-head was smoking deep in her bowels and his iron-hard cock-shaft was levering up her shit tract.
His cock was in so deep that Belinda thought that the knob must have reached her belly that it was sizzling away in a pool of the spunk she had swallowed from the other end.
She began to move first. As Tommy held his cock-meat jammed up to her, Belinda started to hump under him, pulling her shit-chute up and down on an inch or two of cock.
Then he fell into the rhythm with her, slamming his loins out as her ass corkscrewed back. The tit was tight but her guts were adjusting to accommodate his bulk. His cock began to slide in and out steadily.
His lean belly slapped against her curved ass and his bloated balls swung heavily into her crotch, splashing in her sodden cunt-slot.
He fed her a long, underslung stroke that hiked her ass up. She bounced off her knees. Then he plunged in from above, forcing her haunches down. His prick wedged and pried as it quested up her back passage, plowing in so deep that Belinda almost expected it to come out of her mouth.
She swayed, tits swinging under her, ass churning from side to side. She reached back between her slim thighs and fondled his swinging cumbags, squeezing and caressing. Then she rubbed his balls into her cunt.
Her asshole sucked and swallowed as her brother slammed his cock in frantically, filling her to the brim. He threw his head and shoulders back, bridging her torso out from the apex of his prick.
The friction was making Tommy gasp. Belinda jerked her ass around, weaving sinuously, shifting her trim cheeks through gyrations that added torque to the straight in-and-out thrust.
His piss-hole began to weep, dribbling hot slime into Belinda's guts. The film of spunk on her tongue liquefied again. Tasting the succulent stuff, she had the fanciful thought that his precum was running right through her digestive tract and into her mouth.
She began to cream on his balls as she rubbed those swollen bags into her open cunt-slot. His cumbags were bloated with cum on the inside and soaking with cunt-cream on the surface as her cunt-gash juiced him heavily.
"Shoot up my ass, Tommy goo my guts!" she wailed.
She stuffed three fingers up into her cunt-hole, frigging herself as the spasms rushed through her. She could feel her brother's prick running in and out of her twin tunnels, through the narrow membrane dividing her own cunt sleeve from her shit-chute. She finger-fucked up her cunt as Tommy plunged furiously up her asshole, pacing himself on the vinegar strokes.
Belinda whipped her thumb against her clit like a windshield wiper as she stuffed her fingers up her cunt-slot. She grabbed his balls again and mopped them with her cunt. Cunt-cum soaked his groin and pearly ribbons of pussy-juice trickled down her trembling thighs.
Her pussy melted again and again as her horny brother kept on packing the fudge in her ass, buggering her bowels vigorously.
He howled like a dog.
"Yeah yeah!" she gulped, knowing that he was about to cream in her hot ass-guts.
His cumbags exploded in her cunt-slot and his prick pulsed violently. His hot brotherly love sped up his stalk and flooded her bowels like boiling oil.
Her cunt dissolved again as she felt his steaming enema pour into her ass. Cumming together, now, brother and sister jolted and jerked, draining off simultaneously. Tommy emptied his cock and balls and Belinda creamed steadily, gurgling with the joy of getting off.
Her head sank down to the floor, panting. Tommy shagged into her shit-chute for a while, making sure that he had pumped out every slimy drop. Then he slumped over her shaking haunches, gasping in the aftermath.
They stayed coupled for a while, then he began to pull his prick out as it had gone in, inch by inch. His fat knob stuck in her tight asshole for an instant. Then it popped out and his prick swung around like a rubber hose.
Her vacated asshole stayed open and pearly globs of spunk bubbled out, running down through the crack of her ass and blending with her cunt-cream.
Belinda reached behind her ass and dipped a finger into her shit-slot, wriggling it around. Then she brought it to her face and licked it, tasting her brother's spunk all richly spiced and flavored from her ass.
She twisted around to face Tommy. His cock had softened at last, but it was still impressive, looping out from his loins in a meaty parabola. Belinda rubbed her nose against his knob, snuffling and sniffing.
Then she sucked it into her greedy mouth and began to polish the soiled meat, relishing the succulence of cock-meat soaked in shit-chute.
But he was truly drained now and despite the ministrations of her magic mouth, his cock-meat didn't stiffen again. She nursed for a while, then used her nimble tongue to slurp up the spunky overflow from his cock and balls.
Sitting back, she smiled bewitchingly at him. "Gee, I'm so glad we started fooling around, Tommy," she whispered. "I can hardly wait for school to get out tomorrow, so we can be naughty again."
Tommy grinned in eager anticipation, foreseeing a wonderful future of sibling sex.
But their mother had some idea of her own on that subject as she gazed through the glass and frantically frigged yet another cumming from her seething cunt.
Her kids were already depraved.
Nothing she might do could corrupt them further.
And Jenny had some very interesting ideas for extending their incestuous affair.