"Jesus, Stevie, you've got a nice tool for a young kid," Lucinda said to Steve.

"And you know just what to do with it, don't you, Sis?" the smiling boy answered in a husky voice.

"Mmmmm, you bet," Dawn answered, leaning forward.

Lucinda watched in fascinated horror as her older sister bent down until her big tits were mashing into Steve's hairy thigh and Dawn's mouth was hovering near the tip of his inflamed, pulsing cock. With a little wink, Dawn slid her tongue out. Her tongue flicked out and found the red cock and began a long, slow, sensual trip around the swollen knob of flesh.

"Ahhhhh, oh, shit! Dawn, you sure can do it!" Steve groaned. "Lick it. Lick my prick all over before you swallow it!"

The lovely eighteen-year-old with the flashing blue eyes and the tawny gold hair did just as her younger brother wanted. The tickling tongue made long, loving swipes up and down his throbbing prick until his whole twitching shaft was shiny with her saliva.

"Oh, my God!" Lucinda whispered to herself and sat back hard on the bathroom tiles, too shocked to move.

A blow job! Lucinda's fevered, unbelieving brain kept telling her. Dawn was actually giving her brother a blow job!

Lucinda's mind reeled. Some of the junior and senior girls in Lucinda's gym class had talked about sucking off guys before, and one sophomore girl who was a round-heeled slut bragged about doing three guys in one night. But until now, it had all been talk. Until now, Lucinda had always cringed mentally at the lewd image of a boy's hard cock going down a girl's ovaled mouth.

But now she was seeing it! Now it was happening just a few feet away in the other room. And it wasn't some cunt doing it. It was Lucinda's older brother and sister.