Lora for Illustrious.

Often the tentacles are compounded, so if you do not want tentacles, put it in Negative.

The human body often collapses; lowering Lora's Strength to about 0.4 increases the likelihood of stability.

In ComfyUI, APG seems to improve the rate of collapse of the human body structure.

When using tags like oral or throat bulge, adding head back tags will improve stability.