There is a comic and I'm not sure if it is manga, doujin, or western, natively or translated to English, but it involved a slave woman in bondage with large breasts and an enlarged clitoris undergoing forced stimulation with weights that were glued to the end of her clitoris, and many electric brushes stimulating her clitoris. I believe there were also internal components to the stimulation devices.
The comic was verbose in its descriptions and thorough in its depictions of the machine implements used for forced stimulation.
The girl or girls were mind-broken from the start of the comic, and were simply endlessly repeating sexual terms such as "cock". Their master made a note of this as being part of their training, to be completely sexually obsessed and have no other thoughts.
Pic is semi-related merely to illustrate the idea of multiple electric brushes stimulating an enlarged clitoris.
I cannot find this comic in question on e-hentai galleries. I read it several years ago.
I recall now that the nipples definitely had internal as well as external stimulation implements, and were kept stretched by the device to provide more surface for the stimulation implements.
I most likely read this comic on the old manga website called onlineanime .org which no longer exists. Attached is their menu image pulled from webarchive.
Nevermind I found it
http://nhentai.net/g/17283/