The bondage here isn’t elaborate, but the arrangement she has come up with certainly is. It looks like his head is held under the chair, and then there’s a pulley apparatus to connect her footrest to his testicles. I can’t say I’d want to give it a try myself, but I do admire the ingenuity. I don’t think I’ve ever seen this exact set-up before.
This image was sent to me by a reader – thanks Marga! It’s on a bunch of tumblr’s (for example) but I’m afraid I couldn’t find an original attribution.