Quietly!

Somehow, you manage to bit your tongue and keep it down! You shudder with pleasure as you begin to spray the closet door with your cum... Sarah is none the wiser as she settles on her appearence and heads for the bed, slipping om her lingerie and obscuring her coveted body from your vision once more... You watch as she puts on her skimpy black dress and a pair of fuck me heels before heading for the door... You sigh in relief at having gotten away with jerking off to your sister while you stare at her swaying hips... Once she's gone, you pull your pants back up and head for your room...