Light sundress

Melissa sat in her light colored sundress that traced her curves splendidly. The hemline was above her knees, which allowed her to showcase her magnificent shapely and tanned legs.

For a second, she thinks she hears somthing across the room, but shrugs it off and resumes listening to her music as she looks through the stack of DVD's she received in the mail for something to watch.

Frustrated, she sets her soda down and walks into the kitchen for some wine. When she returns to the sofa, it seems for a second like someone is in the room with her.

Then, after she sips her wine...her eyes grow wide and she jumps in surprise.

What happened?