"Look at the cock on Mister Anderson!" Betty whispered excitedly. "It must be all of ten inches!"

"I'm looking," Rod said, remembering to keep his voice low. His own cock had started stiffening as soon as he and his sister had started peeking. Now it was hard and throbbing, it's almost eight inch length straining against his shorts and pants. "Mom won't have any problem taking his big dick though. Hell, Dad has at least eight inches."

"We'll go see if we can spot Dad and his partner later," Betty said softly. "God, I'm steaming already!"

"Just don't get excited enough to make a lot of noise," Rod said, his eyes fixed upon the nude bodies in the bedroom.

The bed was on the other side of the room, away from the window they were peeking through, but they had a perfect view. Earlier they'd made sure that the shade was raised a couple of inches and fortunately their mother hadn't noticed. Rod hoped that their luck held out.

Cliff Anderson was a teacher at the high school Rod and Betty attended and had been to the swapping parties with his pretty wife before, but they hadn't seen him in action. And they still hadn't, Rod thought, since the very muscular young man had only just finished undressing and was sitting on the side of the bed watching Rod's mother stripping.

Rod and Betty had seen their mother naked and in action many times. She was something of a sex-nut once she got her clothes off and was within sucking distance of a hard cock. Or a soft cock, for that matter. They'd seen her use her mouth, tongue, fingers, and various other parts of her shapely body to arouse men for the erotic activities she seemed to crave so much.

The teacher, who was about thirty, was already aroused enough. Maybe too much, Rod thought, seeing the big, stiff cock give a couple of little jerks. It'd be a joke on Mr. Anderson if he got his gun off even before he got his hands on the lovely female flesh being revealed to his eyes.