Bill was slowly jerking off, not trying to cum, but just keeping himself occupied while waiting for his mother. But the longer he waited, the hotter and more impatient he became. But it wasn't until he heard the muffled noises coming from the direction of the bathroom that he decided to get up and see what was taking her so long. Naked, he hurried through the hall, his stiff prick bobbing before him.
The only light he could see was coming from under the crack of the bathroom door, and he lightly tapped. "Mom? Mom?" he called. There was no answer, and then he felt wetness on his feet. He looked down and saw a puddle of water streaming from under the door.
"Mom!" There was still no answer and Bill grew worried. He opened the door.
"Holy shit!" He stood there, transfixed. His sister-in-law was lying on her back, her plump thighs spread wide and her big tits sagging to the sides of her chest. The Waterpik was squirting her naked ass, and her plump, curly haired cunt was glistening not only with water, but with pussy juice I Mary had been playing with herself, and with the Waterpik!
The teenager's heart pounded as he stared at Mary's huge, fat-nippled tits, and his cock swelled to even greater rigidity. The mushroom-shaped cockhead was a deep, shiny purple-red, and the tip was shiny with pre-cum.
"Mary?" he whispered, bending to check her heartbeat.
But he could see she was breathing, for her tits were trembling. Still, he placed his hand on one, watching as the big mound of soft, warm, slightly sweaty tit-flesh flattened and oozed out around his fingers. Her nipple dug into his palm.
He shook her shoulder, then ran his hand down her belly to her cunt. It was like rubbing his fingers in warm, firm jelly; he located the hole at the bottom of her pink cunt.
"Jeez," he said, awestruck. His sister-in-law's cunthole was so tiny, even one finger was a tight fit. And once he was in her hot muscles sucked at his finger, working around it like the mouth of a toothless old woman trying to chew a peanut. He pulled the finger free and slid it down her asscrack until he found her shitter.
"Oh, yeah," he sighed, greatly excited by Mary's fleshy, helpless body.
Her asshole was pinched tight, but it was warm and damp, and very smooth to the touch. He rubbed the pink asshole with his finger, slowly insinuating the tip inside. Mary groaned and squirmed her hips and be pushed harder. Then he was in, her sucking muscles gobbling his finger, alternately squeezing and releasing it.
His cock was burning now, demanding attention. And just as he thought about fucking her, her ass gave an especially powerful squeeze. A grin slowly split his face as he pulled the finger from Mary's clinging shit chute. Her eyes opened.
"Wha… Bill! Oh! Ohmigod!" She seemed stunned, her voice hoarse and strangled. Then she saw his long, fat cock thumping the air between his thighs as he knelt. She struggled to sit up, her tits swinging heavily.
"G-get out of here!" she gasped, "Leave nit alone!" She tried to cover her tits and cunt with her hands. Bill grabbed her wrists and pulled than away and forced her back to the tile.
"You want me to tell Jack and Mom about the Waterpik?" he grinned.
Mary gasped and went cold all over. "You-you wouldn't?"
"I'll tell all your friends, too," he threatened, "if you're not nice to me."
"I-I can't," she moaned, shuddering.
"Sure you can," Bill grinned, cupping one huge tit and jiggling it. "Just pretend my cock's a big Waterpik." And he laughed as she winced and started sobbing.
"Now get on your knees," he ordered. "Shove your ass in the air and keep your mouth shut."
Sobbing, whimpering, her eyes wide with horror, the teenager rolled over and lifted her soft, white asscheeks high. She could feel the round asscheeks shimmer as she moved, and then she felt Bill's fingers probing the parted asscrack, stroking it and teasing her tight asshole.
"No," she whimpered. "Oh, God, no-o-o-o, please don't…"
The boy pulled her asscheeks roughly apart, stretching her tight asshole. He feasted his eyes on its pinkness, then his finger jabbed painfully into it. Mary grunted and squirmed, and he went deeper, entranced by the sight of her round asscheeks jiggling on either side of his finger.
"Oh, Bill, no, no!" she sobbed. "It hurts! Please! No, don't! Ohhh!"
Mary gasped and shuddered as he let his finger rest in her humid tightness for a minute or so. Her muscles were tight as a board, and she knew that was making the pain worse. She tried to relax, but as the pain subsided and a mild pleasure began to creep over her, she moaned with shame. She whimpered. Oh, God, how could she allow her body to respond to Bill's indecent goosing?
"No!" she cried, crawling forward in an attempt to escape the torment in her ass. But Bill leaned over and dug his fingers into a dangling tit and harshly squeezed its sensitive flesh.
"I'll yell for Mom and Jack!" he warned. "Ya want them to see the Waterpik? I'll tell Jack to smell the tip, and he'll believe me!"
Mary groaned and held her body still as he began sliding his finger in and out, stretching her tight asshole, lubricating it and humming happily to himself as her rubbery shit-chute bused him.
Slowly, without realizing it, Mary began rocking back to meet his rhythmically working finger. There was an itchy heat building in her abused asshole and it was spreading to her clit, turning a shameful torment into a strange sort of pleasure.
"Ohhhh, no-o-o-o," she whimpered, as her body betrayed her and began bunching. Her plump asscheeks lifted to meet the boy's ass-fucking finger.
There was a strange masochistic enjoyment to her helpless subjugation. His hard finger sliding in and out of her burning pink asshole was a perversion so enormous that she believed she couldn't sink any lower than to actually derive some pleasure from it.
But then Bill pulled his finger free with a soft sucking sound and knee-walked up to her upraised ass. She fell the hot, spongy knob of the boy's cock against her smallest opening. What was he thinking? Surely not.
Bill grabbed his enormous cockshaft and centered it against the pink, crinkled asshole. The tiny wrinkle looked far too small to even accommodate a normal-sized prick, let alone Bill's nine-inch cock.
The feel of Mary's soft, hot asshole against his swollen cockhead filled the boy with a feeling of power. She was his to do with as he liked, a fuck slave unable to deny him his most perverted, depraved desires. He leaned forward and wormed his cock-tip into her snug asshole.
"No, not in my ass!" Mary cried. "Stop! Oh, it hurts too much – you're too big! No, please! Oh, God, Bill, do it the regular way! PLEASE!"
"Uhh-uhh," the boy shook his head. "I've always wanted to fuck an asshole. Come on, stop tightening it or I'll hurt you. Try to shit, it'll be easier."
"Awwww, God!"
Gasping for breath, Bill watched with glee as his sister-in-law's pink asshole began to stretch and slip over the tip of his huge, purplish cockhead.
"Oh, Jeez, are you tight!" the boy exclaimed with pleasure.
"Awwww, stop!" Mary whimpered, unable to hold enough air to shout. "Ohh, God, it hurts – it hurts! You're killing me – stop! Aaaggghhhh!"
Bill wrapped his arms around her and leaned into her up-thrust, fiercely jiggling asscheeks. He thrust brutally forward, boring his hot, throbbing hard-on into the depths of her bowels. Choked gasps of anguished protest brake from Mary's panting lips. Her eyes were wide with horror. He was in to his balls! That enormous, nine-inch prick was buried to the root in her poor, burning bowels, and she bit her lips to keep from screaming.
Bill eased slowly out, her round hole clutching his cock as he retreated. Then he drove his iron-hard cock back into her, watching its hugeness disappear into the center of her white, jiggling asscheeks until only his balls were visible.
"Agghhhh!" Mary groaned as he stuffed his fat cock into her ass again. And then he began fucking her with hard, merciless lunges, his chunky cockhead penetrating deep in her humid bowels.
"Uhh, uhh, uhh," Bill grunted as he fucked his sister-in-law faster and faster, his belly smacking her soft, quaking ass. Now Mary was panting and whining, adding to his enjoyment of her tight asshole.
The constant tugging and pushing of her asshole made Mary's clit stiffen. Gradually both she and her sphincter relaxed, making it easier for Bill's ass-fucking.
"Like it?" Bill asked, stabbing her tight, nipping asshole with increased force.
"Ohhhh… ohhhh," Mary whimpered, gasping for air as the sensations grew, filling her with forbidden, obscene pleasure. Oh, God – she'd never felt like this when Jack fucked her cunt! Her eyes watered and a small, weak smile formed on her lips. It felt so good to have her cunt get all hot and wet, even if she was on her hands and knees, naked, her ass stuck up for Bill's huge cock to batter. His kneading of her large, hanging tits and the pulling and tugging of her wide-stretched asshole were just what she needed right now.
"Oh, my God!" she cried in the ecstasy of anal penetration. "Fuck me – I can feel it in my bowels – my belly. Do it, do it! Fuck me there, fuck me in the ass!"
Mary's sudden response to his fucking was almost as exciting to the boy as the sensations her stretched ass-chute was giving to his cock. The weight of her fat tits in his palms reminded him of his mother, and fired his lust.
He fucked her clenching sphincter with juvenile enthusiasm, loving the clinging heat of her convulsively working ass-tunnel. He gasped and grunted with his frenzied ass-fucking, for Mary's asscheeks were slapping against his belly and his thick prick was being nibbled, chewed and sucked to death by the strong muscles of her virginal ass.
"Come on!" she cried crazily. "Fuck me – shoot it in my ass – cum in my ass!"
Both the horny fuckers could smell the hot juices being stirred by Bill's cock, and Mary lifted her ass and hunched at the boy. He slammed into her sucking asshole and felt her soft, warm asscheeks shake like jelly. His balls were soaking wet, dripping with cunt-juice.
The pink edges of Mary's asshole looked slightly inflamed from the friction of his mammoth hard-on, but the sight only excited Bill more. His cock made slurping, smacking sounds as he approached his climax. Her puckering, pulsating asshole was grabbing and clutching at his whole cockshaft; he jammed his cock in and out, feeling her ass muscles milking and closing around the spongy cockhead when he was buried to the root.
"I'm gonna cum!" he cried, pumping her harder and pulling on her sore tits.
"Yes, yes!" Mary answered him, wiggling her ass urgently to meet his thrusts. "Squirt it in my belly – fill me with it – give me your CUM-M-M!"
Bill sent his cock deep into her ass and held it there, and she could feel the wide, throbbing cockhead distending the walls of her ass.
"Awwwwaaarghhhh-WWWW," she shrieked, bawled and thrashed beneath his weight. Her clit twitched and tingled, and the bloated lips of her soaking, empty cunt quivered, squeezing out gobs of pussy-juice.
"Ughhhh," Bill groaned as his jism started flowing.
Mary felt his deeply buried cock expand, then jerk; then she felt the hot, liquid spurts washing her ass-tunnel. She moaned again and again, her body quivering as the long, wet jets shot through her quaking bowels like an enema.
"Ahhhhhh," Mary sighed as the thick, creamy jism soothed her battered bowels. She could feel his sticky cum oozing from the edges of her asshole as Bill's prick wilted.
The force of Mary's orgasm left her too weak to maintain her position, and she fell to her stomach, her warm asscheeks closing around Bill's soaking, limber cock. At least half of it still was caught in the throbbing vise of the girl's asshole.
Several breathless minutes later, Mary gasped. "Oh, God, I can't believe it! I-I never came like that." She turned her head to look at him over her shoulder. Like a gentleman, he was holding his weight off her with his elbows. "Oh, Bill, you bastard," she said, shamelessly clamping her ass around his softening cock. "You really hurt me at first, you know."
"Yeah," he grinned, "but it was worth it, wasn't it?"
His cock oozed wetly out as she squeezed harder. "I can't believe I'm saying it, but yes, yes!" she cried. "I know I should still feel ashamed, but I don't. I don't!"
"And next time it'll be easier," he said. "Next… Oh." Mary rolled over, her huge tits quivering on her chest. Bill settled down beside her and put his hand on one. She gingerly reached for his huge, tinged cock.
"Try it in my pussy next time, Bill. Jack's big and he's good, but I still want you to shove this to me."
"Sure, but you've gotta suck on it first." Mary looked shocked and doubtful, but there was no doubt in Bill's mind at all.