Came home early from work.

I think something is going on between my husband and my 17 year old daughter, she is a well developed girl with all the bulges and curves in the right places, boys are eyeing her up, she has had only one boyfriend but that didn't last long, I wonder if she was a lesbian, she always wears short skirts and skimpy under ware, she has always been dads girl, I came home early from work because of a power cut, when I walked into the front room, her dad was sitting on the middle of the sate she was sat at the end with her legs over dads knee her skirt was up I could see her pubic hair, she flushed a bit and got up and left the room, she didn't have any knickers on, my husband went out of the room as well, I was not the kind of position to sit where her father could see your vagina, unless it was intentional and there could be only reason, no I thought it could not be happening to me, I have herd about i****t, or have I got a dirty filthy mind thinking that my husband is having sex with daughter, I will keep on them, opinions please
Jean k