Curate, connect, and discover
perfect, don't stop. Give Bruce that one more traumatic incident so that he’ll finally go the therapy. 😈
I think Duke should be immortal in the "cannot die" sense and Jason should be immortal in the "cannot stay dead" sense and that they should keep this a secret from everyone including each other. And then they should both get caught in a situation that Absolutely Should Kill Them Instantly, miraculously not die, and then be like:
Like Jason shields Duke from some massive explosion or something, and Duke is horrified because he thinks Jason just pointlessly sacrificed himself for someone who would've been fine anyway - only for Jason to very casually come back from the dead, look at a completely unscathed Duke Thomas, and go, "Hey, what the fuck."
And Duke should look at a freshly revived Jason Todd and be like, "Me what the fuck? No you what the fuck."
And they end up both agreeing to not say a word about this to the rest of the Bats. Which poses issues. Because here you have a pair of unhinged vigilante siblings that do not fear death, that additionally now know they don't have to fear each other's deaths either, both unwilling to give anything less than everything they have to do what they think is right (and/or what they really, really want to).
So. Some things that happen in consequence:
Duke throws Jason off a fifty-story building in pursuit of some shoplifting rich asshole that was caught on camera insulting Duke's favorite metal band and being a classist fuck about it. This does, incidentally, re-traumatize Nightwing, who was ten feet away and not prepared to see his little brother yeeted off the side of a building, no grapple in sight - but it also traumatizes the shoplifter when Jason lands right in front of him, grotesquely knits himself back together, and rises from the ground in a distinctly horrifying fashion just to beat the shit out of him. So Duke takes the win.
Jason shoots Duke in the head to get him to stop shining light in his eyes in the middle of a gunfight. He does stop, but only because Batman shows up out of nowhere, and now Duke gets to pretend to be grievously injured while Batman yells at Jason about "self-control" and "maturity" and "putting teammates at risk." Meanwhile Duke is playing up this horrible concussion that he doesn't even have. Jason is seething. (Duke gets checked out at Leslie's. They convince her to lie for them by appealing to her inner petty bitch.)
Jason gets his payback a few months later by poisoning himself at an undercover op and subsequently forcing Duke to drag his dead body around a mob-owned nightclub for like half an hour trying to convince seasoned criminals that this brick shithouse of a man sprawled awkwardly across his back is just... really wasted. Totally not a corpse.
Both Jason and Duke get caught in many, many, many explosions after that initial reveal, and it's always terrifying for the rest of the Bats. It gets to a point where Batman refuses to partner Duke and Jason together for literally anything, because they always act fucking insane. Big metal vehicle moving hundreds of miles an hour towards an unsuspecting civilian? That's okay! Jason will just throw Duke in front if it. Unknown, volatile substance potentially being used by a notorious serial killer to murder his victims? No lab testing required! Duke will just pour a whole pint of the stuff on Jason's bare arm to see how it reacts. Bomb that can't be disarmed? Why wait for backup when these two psychopaths can just grab the thing and jump into the harbor? Like, genuinely. The stress. Bruce is one particularly traumatic incident away from actually considering therapy.