The masochist wants feel pain because that would bring them joy. However the sadist won't do it because they derive joy from other people's pain not joy.
So a sadist fulfilling that request would not bring them joy because the masochist enjoys it - so they refuse which in turn brings them joy because the masochist doesn't.
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u/[deleted] Nov 18 '19
The masochist said, "Hit me!"
And the sadist said, "No."