Omg imagine Theif reader teasing signal (Duke) on top of a building and then running off when he tries to catch her but one time he was so close to catching her but she said
“OMG A ROBIN!” She meant an actual Robin but Duke thought she was talking about THE robins, and he looks away to the direction only for her to slink away shocked her distraction worked! But also relieved
Duke's first thought after hearing "a Robin" is "a robin? the only one who's currently a robin is Damian", then he is think about how Damian has school today, and then his third thought is "is he skipping school again?" so, Duke immediately turns his head, saying "are you skipping class again????"
This gives you a mini heart attack because how does he know you're in school? (You two are literally the same age) causing you to shout "NO" while running away.
Imagine this exchange being recorded? Tim and Barbara watching this exchange go down and just laughing so hard at the two of you. You two are so obvious, it's cute, it's so cute.
It makes them kinda happy, sure their new (future) in law is a hard person to figure out, and sure its super annoying how you ruin their sting operations by stealing the bait, but you genuinely care about Duke and they can see that.
They have seen footage of you sneak up behind him and carefully place pieces of candy that Duke loves in his utility belt when he is not paying attention. How you make sure to never strike him, or try to fight him.
How when he uses his meta ability, you look at him like he's an angel that is descending upon the earth in blinding glory.
They hope you two get together, they hope that you know he likes you. They hope you know how sad he gets when you aren't in Gotham, how he collects merchandise of you to feel like he's closer to you, how he feels when he gets ready for the daylight patrol, knowing that you will be there to keep him company.