Naturally

You lower your your body down and peep in through the keyhole. She had already taken off her shirt and you discovered that she hadn't been wearing a bra anyways. Her small nipples stand to attention and you wonder why as your room is fairly warm. She sits on your bed and kicks off her shoes, followed by her trousers and you see that her panties are absolutely soaked. Your cock hardens in your pants as you watch her peel off her little panties. And much to your surprise she starts to rub herself. Your own hand drifts to your crotch as you watch the display. She slips one finger inside her and lets out a moan, her other hand is twisting her small nipples. Her eyes close and her head tilts back. As her finger pumps in and out of her your own,not so little, finger presses against your pants.