Not sure how practical this position would be, but it's an interesting one. Thanks to the fabulous Olivier for finding it for me, or more precisely for pointing me in the direction of its creator - an artist called Chéri Hérouard.
First stop, Olivier's own posts on the subject. Then on to Wiki and to Spanking Art Wiki, which has a brief entry about Hérouard. He was apparently born in 1881 and illustrated lots of erotic novels during the first half of the 20th Century.
He mainly did FF and MF spanking situations, but also seems to have had a bit of a thing about enemas. A bit of bondage too.
They're beautiful images and very evocative of period. The girls have the slim elegance that was a la mode in the 1920s and 1930s and the costumes (especially the lingerie) and settings are very pretty.
There's a lightness to it all; spankers smile as chastisement is dealt out, sometimes spankees too. But the drawings are also informed by the attitudes of the strict Victorian age - I suppose Hérouard would have been nearly 20 when the centuries turned. In Hérouard's world a misbehaving young lady is corrected in no uncertain terms...