They know

They lick your food and you still eat it. That's their plan, and it works.

At least they are planning something for their life

They are cleaning thier hands with vomit that is what they're doing. They are sick little fuckers. If they land on your food and you still eat it chances are you ate fly vomit. They throw up on thier food to melt it into a liquid than suck it up like soup.