It is worth noting that when the generated images involve hands and exposed genitals, it is inevitable to get not very stable results. And it has a lot to do with the model you use. Unless this lora overfits so deeply that it can only produce very fixed results, which I have been trying to avoid.

1girl version.(2girls version here)

Can only generate side views.

Optional prompt:

nude male

penis,testicles

handjob,double handjob

x-ray, tongue insertion

You can try to use "x-ray, tongue insertion" to generate some cross sections.