I accidentally kissed the neck of my wife's aunt
Why did you kiss her?
I just wanted to have a taste of her sexy body
You shouldn't kiss your wife's family members. If your wife found out she would be angry.
She wan't even shocked since she knows i like her. She is going to leave her husband and marry me
It's bad enough that you're cheating, but to do so with your wife's relative seems pretty awful. Chances are that the entire family will be mad at you. Please reconsider whether this is a good idea for your future.