I really badly want to sleep with my aunt
That seems like a problem. Why do you feel that way about your aunt?
she is seriously hot and has the perfect body.
It's not right to say things like that about your family members. Having sex with a family member is completely inappropriate.
She is not like my real aunt so it's not that bad. If it wasn't for the stigma of banging family I would date her.
Even so, I don't think that you should tell people that. It is not okay to have sex with members of your family.