I think what I’m finding hard to figure out is if the sadist is aware that the masochist is deriving pleasure (even if very indirectly) from their acts, does that kill the buzz for the sadist?
There’s a line in the article “Then there’s good pain which is enjoyable” - the description of the sadist in the book seemed to indicate that this would not be a good thing from the point of view of the sadist.
Is there willing suspension of disbelief on the part of the sadist? Do they even get as far as caring one way or another?
I know you said you’re no expert, so I’m not directing the questions at you just into the ether as it were.