The performers may be adults, but it seems the key thing is an assertion that one or more of the characters are underage.
Which seems easy enough, two 18 year old step siblings. In fact, I don’t know how often they ever explicitly state an age for a character nor anything that would definitively make them underage otherwise.
I don’t really get this. If the characters in the production are adults and not blood related how is it different than roommate porn?
The performers may be adults, but it seems the key thing is an assertion that one or more of the characters are underage.
Which seems easy enough, two 18 year old step siblings. In fact, I don’t know how often they ever explicitly state an age for a character nor anything that would definitively make them underage otherwise.