This past year I've been allowing my husband of five years to have sex with my 19 year old daughter, his step daughter. I found them fucking in the shower when I returned home from work early. Although I was hurt, I found watching them fuck to be extremely horny. Later when I told them I'd watched them have sex, my husband said he'd leave. I didn't want that, epecially when my daughter said she'd go too. So even when I'm around, I allow them to fuck and have on a few ocassions watched and masturbated.