My wife's daughter seduces me into fucking her after she sucks my cock

My wife's daughter has been seducing me since the first day I moved in with them, but I have been managing to ignore her. We were both in the sitting room alone while her mom was in the bedroom sleeping. She approached me and started making sexual gestures at me. I tried to ignore it, but my dick was already erect. I ended fucking her after she sucked my dick.