Me and my gf

My gf and I own a small but fun collection of toys. Her fave by far is her harness, which she likes to use one of the two dildos supplied with it and make me suck it and let her pound my ass. This became my usual "punishment" for challenges we set each other if I fail. After I came to like it, she started to add to it, and as part of my punishment the next time, she and I went to a shop and purchased me a new outfit: A short, slutty skirt, some pink sandals, a padded top and bra, a few pairs of panties, a black dress and a handbag with matching headband. She puts me in whatever of that and some make up and i act like a cheap whore, doing anything she thinks of. Things like pissing on me and even doing it in my mouth. She has made me lick up my own cum. Her challenges are getting worse though. For tonight, she wants me to make myself a cocktail of my own piss, obviously with other things. Im not sure what to do, if I fail, her new idea is to take pics and film me. Now, Im not ready for that, so what can I do to get away with making and takeing my piss cocktail and it not tasting bad. As much as I love her and do anything to service her and fulfil her every desire, this, to me, seems too far. Which means I will have to be her sex slave and toilet tomorrow when I dont take mine later. Any ideas/thoughts?

Never mind. I failed so I will get back from work and face the music.

I think you need to suggest to her that you'd like her to have a bull. Then the fun really begins....