Heads up; this story is about Consensual Non-Consent; I don’t get terribly graphic, but if that’s a yick and not a yum, back out now. Otherwise…
Let me tell you about the time I slapped my girlfriend so hard she fell out of her head. We were doing a CNC scene, in the flavor of hatefuck. Her wrists were tied to the headboard but that was as much bondage as we’d settled on. After some threats, undressing, and manhandling, I left to go to the other bedroom to grab a condom – one of the things we’d negotiated ahead of time was that being left alone for short periods tied up would be a thing that’d be fun for her. I’d intended to go and head right back, but I heard noises while I was in the other room, and so stood in the doorway, out of sight, giving her time to do whatever she was up to.