really freaked out by a SD's Illegal offer

someone offered me to join him and his daughters as they have been incestuous for years. this really freaked me out and has me turned off from the bowl for a bit i think.

but i am wondering if theres more i can do than report him? i just cant get his daughters out of my mind coming home from college to that.. yikes. also if they've been at it for years and the girls are my age, it would have started before they were 18.. not even sure about incest laws, but having sex with your underage daughter is FOR SURE illegal.

im so creeped out.