By now, Sally was ready to explode with anger and excitement. My God, I have to stop this! she kept telling herself.

But she couldn't budge. She was just too turned on by the two children.

Cindy's nipples had popped to attention, stiffening into hard little pellets, and Billy began rolling them between his fingers.

"Augh, augh, augh…" Cindy grunted, her eyelids closing so that only the whites of her eyes could be seen between the slits. "Stop, Billy, stop!"

But Billy didn't stop. He only squeezed harder, and Cindy responded by undulating her slim hips. Delicate beads of sweat collected on her upper lip, and she unconsciously began to press her thighs together.

Billy was straining for breath. His prick, stiff and purple, was throbbing.

"Let me – let me suck them!" Billy gasped. And, before Cindy could give her permission, he pressed his mouth to her right nipple and began sucking on it while he continued to roll her left nipple between the thumb and index finger of his left hand.

"Oh, Billy! Billy!" Cindy cried.

Billy's face was red and swollen. He could barely breathe while he sucked on his sister's tit, and Sally knew that he was too young and inexperienced to be able to control himself. There was no question that he was going to come at any moment.

Cindy, meanwhile, was so excited, she reached out and clasped her hands behind her brother's neck, pulling him toward her hard, mashing his face against her tit.

A great shock wave seemed to toll along the boy's body. He stiffened for a split-second and then shuddered from the top of his head to the tips of his toes. His head shook from side to side within the tight hot clasp of his sister's hands, and then thick pearly wads of cum shot from his prick, splattering on Cindy's face and hair.