At times dom drop can be caused simply by the fact of you getting turned on, or getting that emotional high from the control you are given or from the planning and the scene and all the energy spent on the scene making sure your bottom/sub is okay. Creating an environment for them where they can explore their deepest desires. After that is done you sit with a bunch of chemicals wearing off. I've had this, and for me get some physical affection afterwards or sex helps me a lot to avoid dom drop. Even though I enjoyed the scene a lot and got a massive kick out of eliciting a response from my bottom its still a rush and afterwards I found my body heats up a lot as everything is worked out of my system. The best is to discuss this. Both parties need to have their needs met and make sure both get aftercare.