Could you stand it if I told you I'm infatuated with my step-aunt's feet?
Is it about sexuality too? For real now, tell me the truth.
No I admire her feet for different reasons.
You should not be fantasizing about a family member. It is immoral to do so and can create problems within the family.
She has great feet and they look amazing.
A foot fetish is still something that can be known as a sexual thing depending on how far it goes. You are tempting fate here, be careful where you tread with it. It can end up hurting you and your family, be sure you do all you can to not stay in this state of mind of feet and your step Aunt.