Exposed And Spanked Red
This is a cropped detail from a much more explicit spanking photo. The guy’s using his left hand to pin her legs above her head which exposes everything quite mercilessly to both the camera and his hard right hand. And he’s not been spanking gently, either!
I don’t have good provenance for this photo, but I can find search engine references to it having been circulating on some French and Italian porn blogs and tumblrs as far back as 2011.
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Checking out the tumblir, you are clearly right. Her bum cheeks are starting to redden. However it is casual, explicit, imtimate exposure of her most personal and private parts ie her genitals and anus that is the greater punishment, which she knows she she must bear until her Master has finished with her, one way or another . . .
That’s Bryanna from spankingbarebutts.com; there’s a corresponding video as well