She turned the volume of the radio down and turned on the lights. It was getting dark outside and she rose up to pull the shade down. It was then that she noticed that the door separating her room from Cliff and Barbara's was part-way open. She walked across the room and started to close the door, but a voice in the next room stopped her.

"Give me your cock," Barbara was crooning. "I want your cock in there!"

Linda stopped breathing as she peeked inside the room. The lights were dim, but she could clearly se her sister-in-law stretched out on the bed, her fingers rubbing her snatch. And she was totally naked.

"Get yourself good and hot," Cliff said as he sat on the edge of the bed and watched. "Come on, baby. Heat up the old furnace."

Linda leaned against the door for a moment and then tiptoed to the lamp, switching the light off. She returned to the door and peered into the room. I'll only watch for a minute, she told herself. Only a minute and then I'll close the door.

She gazed inside the room and watched Barbara hold her cuntflaps open with both hands and hump her ass off the bed. The blonde was in her mid-thirties, but sexier than ever. Linda felt a pang of jealousy as she stared at Barbara's lush curves. Her tits were as firm as a girl's, with pointed pink tips. Her legs were long and slender and her ass was round and a little too big. Too big to be fashionable, but really perfect, Linda thought with a touch of envy.

Now Linda held her breath and watched her sister-in-law drill two fingers in and out of her gash. If Cliff takes his clothes off, I'll shut the door, she thought. I swear I will!

Now Barbara thrashed her legs in the air and cupped her big tits, offering them to her husband. He chuckled and moved closer to her, running his hands up her thigh to her pussy. "Fuck, you're a hot-blooded cunt!" he said when Barbara rubbed his prick through his pants.