It’s amazing how much fun you can have with Samantha Sin, a nose ring, a chain, a nail, and a rubber dildo:

From Device Bondage.
Elsewhere on Bondage Blog:
Terrible bondage in this early 1940s horror movie promo still:
First spotted at the Erotic Mad Science tumblr.
Elsewhere on Bondage Blog:
I’m not convinced this double-blowjob bondage neck yoke would be all that practical in the real world; it looks to me like the girls would really have to work at getting the job done with such limited mobility. But hey, it would be a lot of fun trying to move the product from comic-book concept through all the product-research and testing phases:
From the Dofantasy comic The Birthday Gift: Family Reunion.
Elsewhere on Bondage Blog:

From the cover of Startling Comics #47.