"Marie, this is absolutely disgusting!" Kelly spat. "Now you shut your filthy mouth or I'm going to throw you out of this room!"

Marie shrugged and returned her attention to the centerfold. She hadn't thought of turning the page, and now she seemed to be trying to stare right through it, as if enough staring would enable her to see what the man really looked like in the flesh.

"Mmm, I just can't control myself," she whispered.

Sliding up on the bed, Marie let her head and shoulders drop to the pillows clumped against the headboard. Then she shocked Kelly by pulling up the blouse, which was all she had on, exposing her long, slim legs and hairy pussy triangle.

Kelly's mouth opened wide in astonishment.

Before she could stop her little sister, Marie had splayed her milk-white legs wide apart and had slipped a finger into her wet, swollen pussy slit. Then she was finger fucking, moaning and humping her ass on the bed, staring at the centerfold as she fucked her fingers into the dripping mouth of her cunt slit.

"M-M-Marie!" Kelly stammered. "What in God's name do you think you're doing to yourself?"

"Jacking off," Marie said slowly. Harder and faster she fucked her finger into her gushing pussy, jacking off so wantonly that Kelly could see her pussy mouth sucking around the digit. "I'm so hot… unh… gotta beat…"

"Marie, stop that!" Kelly cried, raising her voice in spite of the fear that her parents would overhear. "You can't do that in my bedroom!"

But Marie ignored her big sister. Her face became dazed with lust as she whipped her fingers into her dripping, curly haired cunt, shuddering as she rolled her clit under her thumb.

Kelly didn't like the way she felt watching her sister. Her nipples were getting stiff, protruding through the sheer cotton nightie. Seconds later she felt a familiar wet heat invading her fleecy cunt.

"Marie, get out of my bedroom!"