This LoRA generates bubble butts for ponyXL models. Its nearly the same dataset as my SD1x bubble butt but with a handful of larger sizes added, and better tagging.

Use the tag "bubble butt", with (optionally) one of the following size tags "medium ass", "big ass", "huge ass", "gigantic ass", along with similar Hyperfusion tags. This version goes way larger in ass sizes, but can still do smaller sizes too.

If you want front facing images try "from front", or "ass visible from front" and negative "from behind, looking back, ass focus" at varying weights.