SCENE_01
Their car in the driveway
You look up and see a familiar car easing in without a text first. The thought lands fast: "I can't tell them not to just drop by." Not because you want company, but because the doorbell, the footsteps, the expectation already feel larger than your say in the matter.
SCENE_02
Your house starts bending around them
You start adjusting before anyone knocks. You scoop up toys, move dinner, soften the plans you had for the afternoon. Inside, the private meaning is blunt: if they came up on their own, then it would be rude to resist it. So you become the host before you ever agreed to host.
SCENE_03
A quieter rule you can use
Their habit is real; your access rules still matter. A drop-by is a request the moment it reaches your door, not a command. You do not have to argue with their history to protect your present. You can keep the visit unannounced and still decide what happens next in your own home.