If you want to slime a character lora you need to lower the strength of the character in order to prevent skin color slime. I plan to add more to the dataset to make it easier in the future, current dataset is 67 images. If I can find it I will add more colored nipples to dataset since most slimes in current dataset had no naughty bits at all (and a normal nipple on a colored female is a little strange).
If you are purposely trying to generate the "pool" effect add 'melting' and 'the 'slime \(substance\)' tags to your prompt.