"God, Sis you're a great cock-sucker!" Tommy gasped. "You could suck the batteries out of a flashlight."

She smiled at such a nice compliment.

"I love sucking your prick, Tommy," she whispered. "Your cock is delicious and your cum is so yummy I'll blow you all the time, from now on."

She took his cock-head back into her lips and mouthed him lovingly, delighted to find his formidable prick was still stiff and ready for more action. It had softened and diminished only slightly and she easily sacked it up to another booming erection. His youthful cumbags were recharging steadily.

"Wanna cum again?" she purred, lapping at his piss-hole as if it were a melting ice-cream cone.

"Yeah!" he enthused.

"Let's do something else now," she suggested.

Tommy stared down at her. He had already fucked her between the tits and in the mouth and the thought of fucking her cunt was making him tremble.

Jenny was trembling, as well.

Again she knew that she should interrupt them and prevent an act of ultimate incest.

But the prospect of watching her son screw his sister was driving her crazy with lust. How could she stop something that she longed to watch so much?

If they were going to fuck, Jenny was not about to stop the naughty kids.

But Belinda had something else in mind.

CHAPTER SIX

"You you wanna fuck, Sis?" Tommy croaked.

"Sure, I wanna," she replied. "Only I guess maybe we shouldn't go all the way together being as we're brother and sister and all!"

Then she gave him a saucy smile. "But you can fuck me up the ass," she said. Tommy looked shocked at his kid sister's depravity but not at all reluctant. And her point was valid. Ass-fucking wasn't like cunt fucking, he reasoned. It was really the same thing as a blow-job except he would be squirting his jizz in to her digestive tract from the other end.