Original Pony version Baked for a bounty. So thank @Quiv for requesting it.
Keyword: puckered lips
It seemed to work best when I used token weight 1.2-1.5 for 'puckered lips' and added 'huge lips'
I also put teeth, tongue in the negative which seemed to help with the odd artifacts that frequently show up in the center of the lips
I tested mostly with euler_ancestral_cfg_pp / beta 14 steps 1.4 cfg
Best results with