Surprised my Italian stepsister while she was watching something naughty

The house is quiet, and all the lights are off. He creeps down the stairs, not wanting to wake his father, his wife, or his stepmother. He passes by the living room where he notices a thin line of light coming from under the closed door: his stepsister Nina has her own little hideaway, a laptop computer with an internet connection. He can’t help but be curious to know what she does in here. He slowly opens the door, his shoes silent on the carpet, and she looks up at him, surprised. He catches her watching something naughty on her computer. She tries to cover the screen, but he doesn’t care, he wants more. He comes closer, and closer, and closer.