We are not, in fact, feeding them ANYTHING.
Their mom (next door) is gone all day, and they are really into play. They know that if they stare in the window long enough, eventually I'll go "Oh, you're too cute," and open the door. At which point they'll run back into the yard, where I keep the sticks and pieces of grass that they like me to pull around for them to leap on.
Or, put up a tent for them to play on.
But yeah, I'm told this photo is a bit intimidating...Kitties look like "A posse on a mission," and quite a serious one, at that.