Jiggy,
You'd piss down my throat ONCE and then I would probably spit it at you. I think that is quite distasteful and offensive (unless your sub KNEW that you were going to do it) and I suspect she didn't as you mention "tricking" her. If it wasn't good enough...why did you cum?
It would completely destroy the trust I have with My Sir. Our relationship is based on communication and understanding of what is acceptible to US. If he ever had to TRICK me, I'd also question his trust in me.
Hispleasure