https://civitai.com/models/1590348/concept-pov-anal-fingering-with-index-finger

This Lora allows you to insert your index finger into the anus.

Recommended Strength : 0.8

Trigger words :

AnalfingeringSP, anal fingering, pov hand

Recommended additional prompts :

solo focus, looking back, looking at viewer, ass view, from below, pussy, thighs apart, on stomach, arched back, oiled body, foreshortening

* "on stomach” could also be "top down ass up" or "all fours", " leaning forward"