After Dad is killed, son takes charge as timid mom surrenders control. He eventually coats her vaginal walls with incestuous sperm and makes her his woman.
On a trip with my wife and me my mother-in-law tricked me into fucking her. On a different occasion, it was only proper to take in my sister-in-law, too.
Bradley lures his respectable married sister into spending a weekend away with him, and in doing so demonstrates what a Slut she can be when she really makes an effort! This is an updated rewrite of a story some may have read.