Help on posing and sequencing

[Richter Belmont]

Hi guys, I need a little help regarding poses.
How can I connect a mouth with a vagina? I mean I want the mouth (and so the whole head) of a model to move accordingly with the position of another model's vagina.
Any tip?

In pose edit mode, connect the "NECK" into the model's vagina of your choice. That said, when you move the girl's hips the Head connected will move
accordingly