While aftercare is something that is commonplace in the non-pro BDSM scene, I don't see it talked about a whole lot in the p4p world. If you're not familiar, aftercare is the process of attending to one another after the scene. It can include things like cuddling, talking about the scene, reassurance, words of gratitude, affirmation, and general emotional support and grounding. Everyone requires different methods of care, and receiving aftercare is not limited to submissives and bottoms.
In my experience, aftercare can prevent or lessen sub or top drop, and strengthens the bond between the two players.
Providers: Do you include aftercare as a part of your sessions?
Clients: Do you need aftercare?
Personally, I integrate it into my heavy BDSM sessions, and even send a follow-up email the next day as a check-in. As kinksters, we're playing with raw, emotional and psychological fire, and I feel it's important to keep it well tended so that everyone feels safe and comfortable.