Is it normal to masturbate to your aunt?

I'm a sick person. I feel like a sick person. Lately I've been thinking about my Aunt. I suppress my feelings, and I do not wish to have sex with but I've been having....thoughts. I try to not go that far, but one day I couldn't control it, and I masturbated to the thought of my Aunt. I tried to think about someone else (Not family) but she kept slipping in and I am pretty sure she ended up getting me off.

I feel like a sick dirty person, I'm never doing that again, but I wanna know how normal is it to think about your Aunt like that and shoot a load thinking about her