After reading and rereading “Mistress Joanna”, there was one element of the book that made a lasting impression on me, and that was a device called a “butterfly mask”. It is a truly magnificent and devious piece, and hopefully someone can take this inspiration and perhaps fashion one.
The butterfly mask consists of two major elements. First, there is a full-head locking hood. There are no eyeholes, and the mouthhole has a ring gag built into it, to keep the slave’s mouth held open. However, the hood is attached to a pair of shorts, with the mouthhole sewn to an opening in the crotch of the shorts.
I’m sure the reader can figure out how this works, but it’s fun to describe anyway. The hood is placed over the slave’s head, and locked into place. Then, the Master climbs into the shorts, and feeds his cock through the crotch opening, forcing the slave to take him balls-deep, for as long as he wishes to be serviced. I remember reading about the terror that Joanna experienced the first time she was put in the mask, as her Master naturally had a very large cock (as they always do in erotic fiction), and she could feel it hardening and slowly forcing its way down her throat, with no way for her to back off of it.
So, take from this what you will… and if anyone does feel inspired to create a butterfly mask, by all means, let me know, and show off your handiwork.