"Oh, God! I'm coming!" Claire groaned. "Fuck me hard!"
Martha shivered as she imagined how Claire's cunt must be contracting around her husband's throbbing cock. She feasted her eyes on the pumping motions of Frank's muscular hairy ass.
It was hard to believe she was actually watching her sister and brother-in-law fucking. They were like two lusty animals, romping on the bed. She could see Claire's oozing cunt hole clasping, the rigid pumping prick of her husband.
The tempo of Frank's movements increased flow and Martha could tell that he was nearing his orgasm. The forceful pumping of his cock soon caused Claire to come again. She shuddered and groaned.
"I'm coming!" she cried. "Fuck me! Fuck me hard!"
Frank pounded her juice-drenched cunt. A moment later he stiffened and groaned. Martha quivered as she imagined the hot jets of jism traveling up the length of his cock. She watched the clenching of his ass as he spurted his load inside Claire's pussy.
Soon the couple on the bed was resting in each other's arms. Frank's juice-coated cock slid out of Claire's oozing cunt. He rolled over onto his back, his long wet cock draped limply over his thighs.
Claire rose up on her knees, kissed his lips and then moved her mouth down over his belly and to his crotch. Martha watched in amazement as her sister sucked her husband's wet cock into her mouth.
She licked and slurped over Frank's limp cock and then looked up at him, smacking her lips.
"I love the taste!" she said, with a giggle. "Yummy!" Then she added, "I wish Martha had a man. I feel so sorry for her. She's always alone."
Frank chuckled. "That sister of yours must pass a hell of a lot of time playing with her pussy!"
Above them, on the other side of the grate, Martha blushed.
Claire continued sucking and fingering Frank's cock and it wasn't long before it started getting hard again. Martha's pussy was sopping wet as site watched her sister suck on Frank's cock.
Claire finally pulled her face away and looked up at him. "Want more?"
"Dog-style!" Frank grinned. "Get on your knees!"
Her eyes wide with amazement, her cunt trembling with lust, Martha watched as Claire knelt on the edge of the bed with her head down and her ass up in the air.
Frank left the bed to stand behind her. Claire wiggled her ass and peered at him over her shoulder.
"Come and get it!" she crooned.
He moved forward until his hairy belly was rubbing against the globes of her ass. He slipped his hand down to finger the lips of her cunt. Fisting his cock, he rubbed his cock head up and down between her hairy pussy lips.
Claire groaned as he positioned his cock head in the socket of her cunt hole.
"Oh, God! That's good!" she said.
A moment later his hips lurched forward and he sank his cock all the way inside her steaming cunt. He began pumping, his ass bucking back and forth as he drove his cock in and out of her juice-drenched pussy.
Martha feasted her eyes on the scene below. She thrilled at the sight of Claire kneeling over like that, at Frank mounting her from behind. The animal-like position made her shake with excitement.
Soon Frank was rasping, "Hold on, baby! I'm going to blow!"
A moment later he began bucking his ass in frenzy as he shot his load into Claire's cunt. Once more Martha imagined the thick jism spurting out of her brother-in-law's cock to splatter inside Claire's grasping pussy.
The grunting and moaning of the couple on the bed finally subsided. Frank pulled his jism-coated cock out of Claire's cunt. Claire wiped her pussy with the sheet and lay back. A moment later husband and wife were stretched out beside each other, exhausted and sleeping.
CHAPTER TWO
Martha was riddled with guilt as she quietly slipped out of the attic and returned to her room. Her heart pounded at the memory of Claire and Frank fucking.
Had she really seen it? It seemed difficult to believe that she'd actually witnessed her sister and brother-in-law screwing in their bedroom.
She felt cheated. She was aware more than ever now of all the years she'd shied away from men, all the years she'd avoided sex. She was jealous of Claire's intense pleasure in the act of fucking.
Martha had always thought it was wrong for a woman to let herself go like that. Now that she'd watched her sister writhing and grunting like an animal in response to the pumping of her husband's cock, she realized that all these years she'd been wrong!
She was missing out on life and she had to do something about it before the years slipped completely away, leaving her a dried-up old woman without any memories.
God, how uninhibited Claire was! The memory of Claire kneeling on the bed while Frank fucked her from behind made Martha's knees tremble.
She was ashamed of her shyness now. She'd been shy as a girl with boys and shy as a woman with men. How stupid it was!
Her cunt was soaked. Whenever her legs drew together, she could feel the wetness between her thighs.
She stood in front of a full-length mirror and watched her image as she peeled her clothes off. Stepping out of her jeans, she turned to inspect the swell of her ass cheeks inside her nylon panties. She put her hands on her ass and squeezed her firm flesh. She ran a fingertip into the deep crack between her full ass cheeks.
Her thighs were smooth and firm, her legs slender and shapely. She had always liked her body. Her admiration of her beauty had made the years of loneliness bearable.
Her fingers fluttered over her nylon-covered cunt. She could see the dark stain made by her cunt juice soaking into her panties.
Trembling now, she peeled off her blouse and bra. She hefted her tits in her hands, lifting them up, offering them to the image in the mirror. Pulling and tugging at her long thick nipples, she could see the contours of her puffy cunt lips through the thin material of her panties.
Holding up her tits, she gazed at the slit of her cunt, at the dark shadow of her bush. So many years had passed since she'd had a cock in there; she was as good as a virgin.
She remembered the way Claire had pumped her pussy up and down on Frank's cock. She tried to imagine what it would be like to have a cock stretching her cunt lips now. Thinking about it made her shiver.
She bucked her crotch back and forth, pumping her pussy at her image in the mirror. How wanton she looked holding her tits up like that and pumping her wet crotch back and forth! She looked like a sinful slut!
Once she began admiring and playing with her body like this, she knew she would have to finish it. Watching her sister fucking had started her juices flowing and she needed a good come to settle her down.
She still felt guilty, first at the nasty act of spying on her sister and brother-in-law and now at her decision to play with herself and give herself an orgasm.
Squeezing her tits, she pressed her thighs together. She pumped her cunt back and forth in a wanton dance before the mirror. Cupping one hand over her pussy, she slid the other hand behind her back to fondle her ass cheeks.
Spreading her thighs, she bent her knees to open her crotch, to open her meaty cunt lips. She pulled the material of her panties tight so that the crotch caught between her thick cunt lips.
One hand in back and one in front, she sawed the material back and forth, massaging the meat of her cunt with the nylon. Her clit quivered in response to the rasping friction.
A ragged moan escaped her lips. Now her fingers slipped under the material of her panties to probe the slit between her cunt lips. She churned the thick juice oozing out of her steaming cunt hole.
Tossing her head back she twisted her hips and cupped her ass cheeks with her hand. A moment later she exploded in an orgasm, her crotch pumping as she came, a cry of pleasure gurgling out of her throat.