Frank was close to forty. He was a muscular man with dark hair and a lusty attitude toward life.

"I'm getting juicy!" Claire said.

Martha quivered as she listened. How exciting it was to spy on their intimacy!

"Just hold still and let Daddy do the work!" Frank grunted, as his fingers began unbuttoning Claire's blouse.

He slipped the blouse off and immediately unfastened her bra. Her firm creamy tits bounced free. The long pink nipples had wide aureoles.

As Martha gazed down at the couple, she quivered, realizing she was going to see more than she bargained for! She hadn't expected them to actually do anything, but it was obvious now that, they were preparing to fuck.

Frank lowered his head to kiss the white flesh of Claire's tits. He licked her nipples and sucked them briefly into his mouth. He pulled her skirt over her hips and she leaned on his shoulder as she stepped out of it. In a moment the skirt was tossed away to be draped over a chair.

Wearing only her panties now, Claire looked deliciously sexy. With a teasing laugh, she turned her back to Frank and slowly pulled her panties don to expose the creamy white globes of her ass cheeks. Peeling off her panties, she turned to face Frank again.

Martha gazed down at Claire's blonde cunt and realized she hadn't seen her sister naked in years.

Claire was unbuttoning Frank's shirt and helping him strip his clothes off. Soon the blonde was pulling her husband's shorts down to reveal his long thick cock.

Martha bit her lip as she stared down at Frank's naked body. Claire had his throbbing cock resting on her palm. She caressed his hairy balls with her free hand.

Martha trembled at the sight of her brother-in-law's prick, at his muscular hairy thighs and belly. The white cock thrusting out of his crotch seemed huge.

Martha gasped softly now as Claire opened her mouth and engulfed Frank's cock-head. She sucked on his juicy cock with abandon, her eyes closed, her lips stretched into a ring, her hand holding Frank's balls. She slowly bobbed her head up and down, sliding her mouth back and forth over the thick shaft of his cock.