The person who took every photo, finally in one of them

There's one in every group. They own the camera roll, they do the counting to three, and they are in none of it. Dee has photographed nineteen years of the six of us and I own about four pictures of her. Send it two photos — a group shot, and one of whoever took it — and it puts them in. Not a cut-out floating at the edge. Actually in the room, in the light, at the end of the table where they'd have been standing anyway.