This is the kind of image that needs a caption competition. If she pondering the inherent contradiction in the idea of freely given slavery and the nondualism of pain and suffering? Or is she trying to remember if she needs to buy more milk on the way home? Whatever she’s thinking, it’s rare to see a BDSM image of someone looking thoughtful, pensive and maybe a touch sad. It makes for an interesting change.
This is from the Sub Miss fetish photography site. You can find a number of other intriguing galleries there, including a large version of this image and its sequence of asssociated images.