UPDATE: Currently working on an SDXL version of this Lora. Will make it available soon so I can get some feedback and work out any issues.
Puckered, pouting, kissy face, whatever you may call it. This LoRA should help push the face in the right direction. Check out the examples to see how different strengths behave with different models.
Testing was done with ComfyUI which apparently handles weights a little differently, so you'll need to play with the strength a little. I've found a weight around 0.7-0.8 works well. If you happen to use ComfyUI, remember you can copy the workflow from the preview images.
I'm still new to creating LoRA's so I don't know if the trigger word is needed. Seemed to work fine regardless of what word I used to describe the lips, but let me know if you have issues with it. If in doubt, "pouting" should be the trigger.