Drinking the Mistress' golden champagne is also one of my favorites. Having a Mistress make me drink her pee is a huge turn on for me. It is the ultimate demonstration of her power over me that she can actually force me to drink her pee. It far exceeds being tied up or receiving pain--for me anyway.
My former mistress enjoyed me drinking her golden nectar. But we started out slowly by making slave gruel (instant oatmeal and urine) it really helped to get used to the taste.