The Model is Called Self Anal Fisting. I Believe the title to be quite self explanatory.
This is the first Lora I have made and I think results are pretty good, but I am like the parent of an ugly child who looks at his creation with awe regardless of how others perceive them.
Unlike those parents however, I can rely on the community to inform me of the ugliness that lies within my fabrication, and use that information to turn my ugly duckling into the beautiful swan I know it can be...

So, this is a Lora that makes the subject insert their fist into their anus, it is reasonably accurate, but occasionally the subject thinks it should put it's fist through a butt cheek instead. I use it on weight 0.8 and it hits around 8 out of 10 generations. The pose is currently somewhat restrictive, but I do plan on updating this to include more poses (and fists) depending on how it is received. I will also consider adding an option for male fisting in my next update if anyone wants it.

I am also looking at Incorporating an option where a finger is inserted rather than the whole fist, but surprisingly, this was actually HARDER to find decent training data for...THE MORE YOU KNOW!!

Anyway, please let me know how you find it and any feedback that could help to improve it will be well received and appreciated (as long as it is polite). Happy Fisting!!