Oof?
Here's a LoRA that needed to be made for my own sake... (and lewdness) PonyXL and AutismMix don't really seem to understand or generate Autofellatio/Cunnilingus well, if at all. I've only been able to get decent generations with very specific tags or artist styles. This LoRA should hopefully eliminate that. It also works well for both Anthro and Feral characters. I've noticed the best results are at the usual 0.8; however, it will work all the way down to 0.4 and up to a maximum of 1.2 before things stop working or get way too crispy.
Activation Tags: Autofellatio, Autocunnilingus
For Feral characters adding these tags will help with results: Flexible, curled up,