This was a bounty

Puts an Eggman logo on butts reliably. If you don't prompt for ass then it tends to stick it over nipples or on the crotch. I assume this is due to the AI assuming the symbol is pubic hair or nipples/areolas since my data set had only images with the logo on the the butt. Roughly 50% of outputs are fairly well formed when prompted with "ass" in my testing. Grid included for example of raw output.