Couldn't find a butt crack lora for flux so I made one myself. First lora so probably not perfect, but from my testing seems alright.

Lora strength of 1 works fine.

Keyword is bttcrk, but you should just be able to describe as well, e.g.

• "her jeans are riding low exposing a slither of butt crack"

• "her leggings are pulled down showing her butt crack"

Didn't train/test of males so idk how it performs.