"You're so wet, Sarah," Karen whispered, her voice very thick and low. "You've soaked your panties, baby."

"Karen, please…"

Again her sister shushed her, sliding her hand down the elastic waist of Sarah's panties. Sarah couldn't breathe as she felt Karen's fingers brush through the soft hair of her cunt and when a fingertip touched her clit her hips lurched forward, wanting the pressure.

Karen was nibbling at her ear now, and rubbing two fingers along the swollen sides of Sarah's bulging clit squeezing it between them. Sarah twisted her ass, feeling her sister press her hips forward. She balled her fingers into fists at her hips, fighting to keep from turning in Karen's arms, grabbing her tits, kissing her, licking her lips and sucking her tongue, feeling her sister's body, her ass, her cunt.

"Mmmmm, nice and juicy," Karen purred, kissing lightly at Sarah's ear. "Your pussy is very hot and juicy, Sarah."

Sarah gasped as her sister worked a finger into the steamy depths of her cunt. As Karen slowly pushed and pulled her finger, Sarah suddenly became aware of being in front of the window, her dress up, and her sister finger-fucking her cunt. Heat moved over her face, but the burn of her pussy intensified and she pushed her palm hard on top of Karen's hand between her thighs.

"Let me," Karen mewled, her wet tongue circling Sarah's ear. "Let me take care of it… make you feel good… take the tension out of you."

Her finger darted in and out of Sarah's cunt, picking up speed as the heel of her hand smashed the straining clit. Sarah spread her feet on the floor, wider, her hips humping to the rhythm of her sister's penetrating finger. She cooed and gurgled softly, the hairy lips of her cunt clutching Karen's finger.