A couple poses to use. Hopefully they work well, may need some playing around with.

Try these tags:

Peekaboo Pose, One leg up, pussy, anus, head down,

LegLift Pose, All fours, hands on ground, one leg down, one leg up, leg lift, leg raised, leg half lifted,

Lifting leg with hand,

one leg up, leg lift, leg raised, leg half lifted, Leglift sex,

one leg up, leg lift, leg raised, leg half lifted, Side leglift, sitting leglift,

ThePose