Summary:

Tim is a machine, and the best tool Batman has ever had. Tim’s only purpose is to help.
When Batman no longer can function, not without his sidekick, someone must step up. That someone is Tim.
“My body is easily replaceable, but I’m capable of doing anything you need of a Robin. Trust me. You'll never have to fear losing Robin again."
That sentence is factually true. At the time.
When volunteering as tribute Robin, Tim forgets that Robin... is not a tool.
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An AU retelling where Tim is an Artificial Intelligence / Android. It’s basically an Emotion, not a Plot. You have been warned.