In BDSM they talk about 'sub drop', where the submissive needs rest, relaxation, affirmation and general aftercare, after an intense scene. Eg blankets and cuddles.

Does anyone WAM so hard they need aftercare?

I once has a session that was absolutely perfect in every way, and at the end I couldn't walk properly so had to be helped to the bathroom by my partner. I remember standing in the shower for about 5 mins before my brain caught up and I remembered I was supposed to be getting clean, and for another 15 mins I was in a daze.

I only really came too getting out of the shower and started the clean up.

I tend to sub as default, though I do switch, but never had actual sub drop.

Absolutely. It's really important to remember that even though sploshing doesn't usually involve physical pain, people can have really intense physiological and emotional responses. Aftercare is just as important in sploshing as in BDSM (and of course depending on the dynamic there can be aspects of BDSM in WAM anyway).

Also remember "top drop" is a thing too. I've had that after a long and really enjoyable session. You can just feel really depleted when you've been intensely aroused for a sustained period.

Absolutely, I've had both sub drop and dom drop after wam sessions - aftercare is important whatever you do!

Once hooked-up with a guy, he was a little older than I. He lived way out in the desert, but had made his own 'mud-pit'. We hung about a bit, havin' drinks, then ended up in the mud. Was a great time, but at one point, thought he was havin' a 'heart-attack'..... Two guys, totally in mud-covered gear, way out in the middle of no-where.... I stopped what I was doin' to him, got a cold bottle of water for him, and just let him relax.....
Fortunately, think he had just got 'over-excited', and we just lazed around in the mud till he felt better....
Would've been an 'interesting' story to tell the 'E.M.T;s' if I had to call 'em......

I do and I ask anyone with me the same before
part of what makes Wam exhausting least for me is how intense I can get and how I need time to rest in the arms of grace to re calibrate going back into the world with my own skin.