Fathers Dimentia

My father is 68 and is starting to get dimentia. He is now walking around the house with very little clothes on. He has also mistaken me for my mother before but she has been gone for 3 years now. With my father thinking im my mother, he has done and said some quite vulgar things to me like walking by me and grabbing my tits or if im sitting on the couch, he will pull his boxers down, take out his cock so i basically have this 10" schlong staring me right in the face and says "Tina, suck me off". I know its my father and its wrong but the approach i have taken is just go with it. The first time i sucked him off i didnt realize he was so rough and degrading to women. He took my big tits out and basically face fucked me until he came all over my face. The worst part is i came by just sucking off my father. How bad of a daughter does this make me??