Since I know I can sometimes be a little difficult for those who aren't very familiar with me and my ways of thinking to figure out:
"...they control it in partnership, with the pyl setting boundaries (and expanding them if he/she wishes) and the PYL determining what happens within those boundaries."
I like that. Too many Masters seem to go around bragging about how they're the one important and that really turns me off the BDSM communities. It's nice to see someone acknowledging the importance of both sides.