Okay so ...am I disgusting for thinking this

Added anon because not sure how people would react 
So basically I have a thing for incest and taboo role play. Me and my ex used to play as daddy and daughter but when I asked to pretend to be like uncle and niece or brother and sister he told me I was disgusting. I even have a girl ex and I said about role playing step sisters and she said that it was wrong , I watch porn about it and read erotic fiction about it but am I disgusting. I would like to make it clear that I have no desire to sleep with any family members just role play.