Mmmm, I don't know. Maybe that look of agony is saying, "Holy Jesus! MY FUCKING SPINE!!!!" I have never been in that situation and am not female, but I theorize having my pussy and thigh tickled would come second to having all my weight pinned on my stomach and tits whilst being folded in half. In that position, if I am not paralyzed, I think the tickling would be like throwing a handful of salt into the ocean.
Beautiful picture though, love the agony on the face! You weren't lying when you said 'strict'.