Chuck thrust his hips out. "Suck it, Sis!" he rasped.

Teasingly, Frostie avoided contact for the moment, moving her head playfully back.

But then she ducked in and flicked her tongue out against the greasy tip.

Chuck groaned.

His sister sighed with pleasure as the flavor of his gooey cock-knob registered on her tastebuds.

Chuck wrapped his fist around his cockshaft and gave it a slow push-pull, snorting like a bull.

"Don't you dare jack off!" his sibling cried.

Her brother leered at her.

"Then get to work!" he croaked, pulling his hand back off his prick and shoving his hips out.

It was obvious to their peeping mother that this was not the first time that her kids had enjoyed oral sex. She was mildly shocked.

But mainly she was envious.

Her own mouth was watering and her tongue was sizzling in her saliva as she spied.

Frostie sat back on her heels and opened her blouse. Her nubile tits emerged, the globes firm and the tips like juicy pink gumdrops.

Her daughter's delectable nipples were making Rachel drool damned near as much as the sight of her son's smoking-hot cockmeat.

Frostie squirmed in and began to rub her tits against her brother's cock and balls. She brushed the taut tips against his cockhead, greasing them up as more preliminary goo oozed from his piss-slit.

Cupping her plump tits, she lifted them and deepened the cleft between. Chuck nudged his prick into her cleavage and humped, frigging up and down.

His cockhead was laying a trail of slime out of her tit-tunnel and up her breastbone.

Her tawny head tipped down and she flashed her pink tongue against the tip of his prick.

"Yummy!" she sighed.

She stuck her tongue out so that her brother could see his jizz filming the moist lapper meat.

Her mother was every bit as thrilled by that sight as her brother was – although, of course, naughty Frostie was unaware of being watched.