My idea for a new story is a lonely mother, her husband has died and she is living with her 18 year old son and 16 year old twin daughters. The twin sisters and their brother get horny and have an incest 3some, then the brother talks them into raping their mother, ending up in a big incest rape, but then the mother reveals she likes it and has always wanted to fuck her daughters. The son jerks off all over them all.