Alice and Koshka took turns on the cross, each observing the other's performance whilst resting. Using two models thus allowed almost continuous shooting, minus the time it took to suspend them for each stint. I sometimes wonder if this inspired an element of competition between the models.
It was a shared experience, but not both suffering at the same time. Each girl gets to rest and watch the other perform. Yes, maybe an element of competition, maybe even a heightened arousal to know you are next, to see the other girl sitting a watching so calmy. Watching the other and thinking "is that what I look like up there?" Thinking how sexy the other one looks. Feeling a little spreading warmth inside at the sight! The crucified one having that bit more incentive to perform, to endure, knowing that she has a knowledgeable audience. I've always loved those few sitting and watching behind the scenes pics
They are such complimentary girls, too. One slim, waif-like, with a talent for showing her suffering. The other more curvy, a real presence on the cross, those wide hips and generous breasts. An absolutely classic shoot.