From some, the casual pre-arranged scenes are the extent of their involvement in D/s; so for them, they do see these as what a D/s relationship entails.
For others, D/s has more meaning and goes beyond just activities that are arranged.
And then still you have those who can combine the two yet keep certain parameters in place ( as you mentioned, you play causally but do not see this as a D/s exchange; more of a Top/bottom exchange )
For myself, I don’t engage in casual play or play parties so my view of D/s is strictly the interaction that I have with others. I view the two as personality traits and not acts.
With all that aside, having someone tell you how a pre-arranged scene is going to play out; dismissing your input from it; that is not something that I could partake in. Unless I knew the person very, very well; and they knew me just as well ( in this case I would most probably follow where they lead ), I would refrain from playing with them.
edited because my font was way too big