Beware though that as a principle, BDSM limits should be negotiated first. If surprise scenes and surprise actions during the scene have been negotiated, and the sub expressed the willingness to try, or the explicit request to do it, there are no obstacles.
“We talked about our likes and dislikes and established a safe word, but no further negotiations. We played three times now, with me being wrist and ankle cuffed to the bed and blindfolded. I had no idea what was going to happen, and I was teased/edged, she used an ice cube, a soft brush, and I loved it! To me, not knowing what is going to happen is a great turn on!”