I mean, doing stuff for people on here is a nightmare all of it's own. First erp I ever did, I was extremely paranoid, and that didn't change much.
It's a lot easier to break ethics screwing around with people, than it is watching porn. So you always need at least some prep, and a quiet environment.
I would suggest: Getting eaten out.
I would not suggest: vore. Seriously, it's an endless blsckhole that cannot be understood or satisfied.