This one was a side effect of building a dataset for a future LoRA. It assists with the creation of cocks with patchy skin, kind of like penis mottling for non-horse cocks. I don't see this being super popular but someone might really appreciate this.

Seems to work fine for standard skin tones but probably won't work well for unique colors(red, blue,green etc). Tends to increase cock size so be aware of that.
Example Prompt:

frankencock, 1girl, solo, penis, testicles, futanari,