Djarumdoll -- Excellent comments about your choice of play and why.
Do you have any type of signals worked out in case of emergency?

You know, "There's a cop at the door and you really need to stop now!"
or
"If you don't stop, I'm going to be ill."

Or do you just let your sub say those words and listen.
What if your sub is gagged?

Looking forward to how you handle these types of situations or plan for them.

whippedcream -- Tap! What a great word. Easy to say and remember. Too bad it didn't work on that stomach cramp. I could use a word like that every now and then. :-)

Thanks everyone for jumping in to answer Ranai's questions.
Who's next?