I was toying with the idea for a while of a chinchilla whose abdominal region, when viewed either directly or with high-res camera, gave the viewer the moderately strong compulsion to do whatever they thought the chinchilla wanted them to do. Possibly along with some group of interest using a high-res photograph of it with the caption "Kill for me?"
Never really got around to writing it up, but if you want to try it/take some ideas from it, feel free.
Edit to clarify: In mine the chinchilla in question is just a regular chinchilla, aside from the fact that its tummy is literally too cute to say "no" to, and thus its actual desires are quite mundane. The creep is in what desires people might project onto it.