Alternate point of view []

Your sister was used to guys lusting after her, but her own brother? The thought had never even crossed her mind, so when she brought guy's over she couldn't have known you were stroking yourself to the sounds of strangers bottoming out and cumming inside of her. Even your mother was oblivious to this. When you moved away you missed the sounds of them being fucked by big cocks so much you almost exclusively used the sounds of it to wank off to. You missed the sound so much that when they asked you to visit you said yes just to get a chance to hear your older sister and mom get stretched out.

You have just pulled into their driveway...