Here's the defecation lora, it was available on Civitai until the ban on scat content. You can use various trigger words to get different effects, like "Scat", "Disposal", "Feces" and so on. The main problem with this model is that that it tends to confuse the anus and the vagina, so you'll have to add prompts and negatives usefull to reduce this effect.
You can find my other models on Civitai: https://civitai.com/user/JollyIm/models
A first example:
Prompts: Realistic, Realism, (Masterpiece, Best Quality, High Quality, Highres:1.4), Detailed, Extremely Detailed, Ambient Soft Lighting, 4K, (Extremely Detailed Eyes, Detailed Face and Skin:1.2), masterpiece, best quality, 1girl, feces, disposal, (anal:1.2), lora:defecation_v1:0.7, (public toilet), embarassed, (pile of feces), (perfect pussy), (perfect vagina),
Negative prompt: easynegative, (worst quality:1.2), (low quality:1.2), (vaginal), (dirty vagina:1.2), (feces in vagina:1.2), (feces in vagina:1.2)
Second example:
Prompts: masterpiece, best quality, 1girl, scat, (anal:1.2), lora:defecation_v1:0.9, (toilet), from behind,
Negative prompt: easynegative, (worst quality:1.2), (low quality:1.2), (vaginal), (dirty vagina:1.2), (scat in vagina:1.2), (feces in vagina:1.2)