I have this fantasy where I am trying to decide whether I really want to try it, or it just sounds better in my head...
Uncomfortably full bladder
Light pussy spanking over panties with a hairbrush
Over the knee spanking, still with panties on, and...
Pissing my panties while over the knee, getting spanked
Spanking and ticking with a full bladder is a good way to incorporate piss into play. Good spanking can force uncontrolled peeing, its fun.