If a ball-gag appears in a work of erotica, one or more characters must use said ball-gag before the story's end. Variation of Chekhov's "gun on the mantle." Bonus points if you put the ball-gag on a mantle.
That ball-gag hasn't been used yet, but it seems important - it must be a Chekhov's Ball-Gag!
by Marilyn Spence December 31, 2020