As she pressed close to Marlene, Jackie glanced at the open window. The face of her young son was there, watching.

A shiver moved about her flesh as she opened her long, luscious thighs to her sister. Her cunt had been bubbling hotly, stroked into steamy wetness by her sister's fingers. But with her son peeking at them, her pussy became wetter still, so much so that hot juices seeped from her cunt lips, down over the creamy skin of her ass.

"God, Marlene," moaned softly, watching the window with slitted eyes. "You're still as good as ever."

"I keep in practice," Marlene whispered throatily, probing at Jackie's bulging clit.

Jackie knew Timmy could hear every word, and this excited her, too. It wasn't the first time she had caught her son peeking at her, though it was usually at night as she undressed for bed. She knew he sneaked, out of the house when he was supposed to be in his bed, and looked into her, window. At first, Jackie had felt anger, then a slight shame, and finally, excitement.

"You're sure about marrying this guy?" Jackie asked. "He's so much older than you. I hope you're not making a mistake, Marlene."

"I'm not," her sister replied, dragging her finger up and down the juicy slit of Jackie's cunt. "He's rich as hell, an he's promised to set up a trust fund for Bobby's education. He knows what I'm like, and won't interfere."

"Remember what I said," Jackie said, wiggling her ass. "Don't try to get me involved with him. I won't have anything to do with a threesome, Marlene. No more of that?"

Jackie's blouse was open, her shapely tits firm and widely spaced, her pink nipples straining nakedly. Her skirt was around her small waist, her panties dangling from one ankle. She had her legs up, bent at the knee, spread apart. Marlene was sitting between her feet, stroking the sensitive inner flesh of her thighs, tracing the blonde triangle of silky pussy-hair and slowly poking her middle finger into her cunt. Jackie arched her hips to her sister's finger, mewling softly, glancing at the window often to make sure her son was still there.