Over the next week, strange things happened. The key opened the communal mailbox—not just his slot, all of them. Then the basement furnace room. Then the rooftop access he'd never been allowed to use. Each time he turned it, the key grew slightly warmer. Each time, he felt a flicker of something else: a memory that wasn't his. A woman laughing in a room he'd never seen. A child’s birthday party. An argument about money.

He ran back to the shop. It was gone. In its place: a blank wall, fresh brick.

Arthur didn't notice the new shop until his key broke.

He thought about the daughter he now remembered—her first steps, her fever at two years old, the sound of her laugh. She wasn't real. But the memory was.

Arthur had no children. He had never been married.

And the key was still warm.

"They are now." The man selected a blank—heavy brass, warm to the touch. He placed it in an ancient duplicating machine, not electric but hand-cranked. As the cutter bit into the brass, Arthur felt a sudden pressure behind his eyes. Not pain. Recognition. The sound of the grinder matched his heartbeat.

A note on the ground: "CCK keys cannot be un-cut. They can only be shared. Find someone else. Give them the key. Transfer the burden. Or keep it, and become everyone you never were."

That night, he dreamed of a hallway that wasn't his. Long, red-carpeted, lined with doors. Each door had a lock. And his key fit every single one.

Arthur laughed it off, paid the absurdly low price, and went home. The new key turned smoother than silk. The door clicked open not with a clunk, but a sigh.