I thought I'd have a shot... I love posing challenges... assuming it's for V3, this is what I came out with. V3 wasn't really built well for this type of bending, but a little postwork can sort this out nicely.

Download pose file here

Playing around with some of the injection morphs, for example glute raise, glute full, glute narrow, etc, will also help her butt shape.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire