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Alright alright.
This post combined with the "Tim was Duke's Robin growing up."
Add that with the "Duke becomes a Robin-like protege to Tim helping anchor an adrift RR" au.
What do we get?
Tim calmly and patiently working with Duke, particularly with his powers.
The two of them causing chaos and showing each other their tricks to circumvent blame/suspicion.
Tim slightly dissociating as he's showing Duke a move Bruce once showed him. Duke's cursed fumbling bringing him back to the present.
Tim trying to channel his inner Dick Grayson as he supports Duke despite his mixed feelings about it. Tim slipping up and referring to Duke as Dick used to refer to him: "baby bird."
Duke freezing.
Tim internally panicking (and quite a bit externally) as he apologizes.
Duke uncharacteristically hesitant as he allows Tim to call him by that endearment.
This brings them closer together (pretty much family) while painfully healing some of their hurts