Aftercare is an extremely important part of any scene or session. I teach a class on aftercare that strives to describe this including how to negotiate it.

It is possible to negotiate no aftercare, to not want aftercare, or to get your aftercare from someone other than the person you played with. However, that does not exclude aftercare from the session.

I think any Professional would seek to at least make sure any first aid had been performed if needed at bare minimum. A check in or follow up is standard. I like to think of it like a doctor's visit where your aftercare is your take home instructions and a quick follow up if necessary.

The concept of "sexy aftercare" is not something a professional provider would do as I'm understanding your question. That is something better suited to a personal relationship. And even in Lifestyle BDSM classes I caution against using sex as aftercare unless in an established relationship.

What does aftercare consist of? From my class outline-

Immediate aftercare- health assessment and any immediate first aid. Water. Maybe a snack. Rest. A blanket can be nice.

Secondary aftercare- Clean up and refreshen. Maybe more water. Conversation and come down. Regroup and secondary assessments of first aid. Perhaps some comfort- petting. foot worship. snuggle your stuffie. etc. Making sure you are safe and in good mental order to go home!

Tertiary aftercare- follow your selfcare routine! follow any instructions for first aid or processing you might have received. rest and recuperate. check in and follow up with your provider.

Most drop can be avoided with sleep, food, water, and other basic selfcare like hygiene or enjoying personal hobbies and friends. I suggest all subs plan for their own aftercare and learn what helps them. It can be different for everyone and often coincides with your preferred play activities.

That goes beyond your question but maybe that explains something to someone somewhere.