"Right there, yes, oh God - yes!"

That was followed by half-stifled moans and squeals as Janice listened 
in at the partly open door.  Nothing could be seen, as the bedroom and 
hallway were almost completely black.  Having lived in that house for 
twenty years, she didn't need sight to walk the long hall to her 
bedroom, so she left the lights off.  Not wanting to wake her sister, 
she had been silent entering the house.  Then she heard the groans.

Her date was a bust.  Their "Weekend in the Country" turned into him 
pounding on his P.C. all Friday evening and most of Saturday, with no 
break in sight for the next day.  She left him to his work in that 
oversized lean-to he called a cabin and went home - one day early.

Finding that her younger sister wasn't alone was a bit of a surprise.  
Mike, her sister's boyfriend, was supposed to be out of town for the 
weekend, visiting relatives.  She guessed that he probably got just as 
bored as she had.  With their parents gone as well, those two would have 
had the whole house to themselves.  That must have been irresistible, 
she thought.

A brief, laughing squeal made her jump.

"Oh, that tickles!  You're naughty!  No!  Don't you dare stop!  Get that 
tongue of yours back to work!"

Janice could almost feel what Mike was doing in there.  Those soft 
sounds and slight wet noises fed her overactive imagination.  She knew 
she should leave, should give them privacy for what they were doing, but 
couldn't tear herself away.  When the moaning stopped, replaced by 
short, gasping breaths, she almost had a climax herself.

An impish smile formed on her face as she pictured what her sister's 
expression would be in the morning, when she found out someone else had 
returned early.  The thought was almost too much, almost making her 
laugh out loud.  Janice had to put a hand over her mouth to muffle her 
snickering.  She decided to head for her room before someone turned on a 
light or came out for something and made an embarrassing discovery.

Just as she was turning to leave, her mouth opened in shock and she did 
gasp out loud.  Someone was laughing in her sister's bedroom.  It was a 
feminine voice.  It wasn't her sister.