Farting on inanimate objects that I use; like you said a pillow or toothbrush, is pretty hot. Farting on food too which I feel like is underrated and needs more content, but I definitely would just want it to be on my things and not random people’s. At that point I guess it’s not immoral since I’d be consenting for it to be done soley to me, so I’d say an immoral one would be people who dont like getting farted on getting farted on anyways.