She had no idea that her erotic inclinations were in this direction. Did she really enjoy being tied up this way, her tits and cunt exposed and so vulnerable to them, not able to resist? Was that what turned her on?

Whether or not she wanted being helpless, tied hand and foot, unable to stop this young boy and girl from opening her blouse, pulling her panties aside and seeing her cunt, playing with it, Kathy didn't know. What she did know, beyond a doubt, was that it was exciting as all hell to her.

Cindy adjusted her position and began to run her hand up and down the creamy inner surfaces of Kathy's thighs. Robert watched with interest, his cock swelling again.

"I'm gonna take her panties off," Cindy announced and began tugging at the panties.

"Oh, please don't do that!" Kathy whimpered, writhing her ass. "Don't, Cindy! Please, don't take my panties off."

Kathy shivered as her panties were pulled down. They would go no further than her hips because her legs were widely spread. Cindy leaned over and pulled a pair of scissors from a nightstand drawer, cutting the panties away. Kathy closed her eyes, feeling shamed. Her cunt was fully revealed to the brother and sister.

Robert and Cindy gazed at Kathy's cunt, seeing the thick curls, the pink lips now so moist.

"I'm gonna fingerf uck her!" Cindy giggled. "I'm gonna fuck her cunt with my finger!"

Kathy gasped loudly as the little girl's finger shot into her twat. She twisted her hips as Cindy's finger thrust rapidly in and out. Then she felt Robert rubbing her clitoris. He rubbed at it as his sister fucked her finger in and out of her pussy. Kathy, through her increasing pleasure, wondered how they knew so much about sex. How did Robert know a girl could become so excited when her clitoris was touched? They seemed too young to know all this.