I sucked my dad but he doesn't know

The sex between my brother and me is nothing new to our parents. They're not really happy about it but they accepted it. I'm kinda interested in getting intimate with my dad. I told him that I want sex with him but he didn't. I kissed him but he pushed me away. Also when I was naked in front of him he never reacted. It was very frustrating. On Monday he was going to bed before my mum, she wanted to watch her favorite show in the living room. That was my chance. My parents bedroom is completely dark, so I sneaked in and grabbed my dads dick under the sheets. He woke up and thought I'm my mum. He started moaning and said "Anna that's so good" that's my mom's name. I put his dick in my mouth and sucked him till he came in my throat. He was falling asleep really fast again, so I left the room. After that I was extremely wet and needy. I had sex with my brother but imagining it was my dad.
I can't stop thinking about it. I REALLY wanna have sex with my dad. Now I don't know what to do. If I tell him what happened on Monday he could react negative. Should I do it secretly again or talk openly with him?