When I first read your post I was a bit surprised at this 'punishment'. Some subs may like it, but from most people that I've met here aren't to fond of urophagia. So I guess surprising her with that might be pretty offensive in terms of your treatment of your subs.

Plus, you say it's a form of punishment. From the dom/mes that I've met here, they don't dish out punishments spontaneously. And since it takes a great deal of trust for anyone to submit, it would be almost like an immense failiure for sub to be treated without even notification that their master isn't happy or satisfied.

Again, I have never been a dom or sub to anyone, and all I know about treatment is what I've read of other people's posts, so I don't claim to be entirely correct, these are merely educated assumptions.