Gene Bilbrew was a prolific bondage artist, producing works from the 1950s to the 1970s. He used a few pseudonyms, such as Eneg, which is Gene spelled backwards. More biographical information about Bilbrew is available at Wikipedia. Jeff Rund has written a long biographical essay on Bilbrew in Bizarre Comix Volume 2, an issue that features two 30-page serials from the artist.
Distributing bondage art as photographic reproductions of drawings was a typical form of the 1950s, 1960s, and into the 1970s. I haven't read much about it, but I assume it was because the producers did not feel they could take these works to a printer. Therefore they used their home darkrooms to reproduce the work. Materials like this bondage photo set were distributed in catalogs, like those distributed by Eric Stanton, Candor Inc., and Photo Talents, alongside photo sets of actual people in bondage circumstances and booklets like Nutrix and Mutrix.
These sets were called "Art Sets" or "Serials" in the catalogs. The individual pages are called "Episodes" or "Chapters." Some of the multi-part sets, such as Sheila, are controlled; obsessively numbered with parts and chapters. Others are less tidy.
This particular set may have been put together from paperback illustrations that Bilbrew did for Hilbarth books. The story does not really hang together in the way other serial art sets do.