I really wanna fuck my sister.

I (22M) know it's weird but for the past 2 months, I have had multiple times where I thought back to the one time where I saw my sisters (24F) pussy. It's gotten me bricked up a few times to where I 🥜'd to her multiple times. If I ask her about it though, I know I'm going to get shamed on by my parents. It's just gotten extremely hard to not think about it every time that I masturbate. For the holidays when we meet up at out parents house, I even masturbated outside her door in the middle of the night. Let me know if this is okay or not or am I just a creep who deserves to be flamed on.