yes i have many hcs and dickbats and robin dami is one of their best eras!! i also think they wouldn't realize it at first but dick would notice it before dami and stay quiet about it till he decides what to do.

i think, they'd sleep next to each other, starting from when they were batman&robin and after that wouldn't be able to fall asleep easily without other next to them. with sleeping. i think at first it would suffice for them to be in the same bed but over time, dami would find himself waking up with dick's arms wrapped around him more and more often. more intimate each time.

to me, being in the same room brought them a subconscious peace of mind. and they were together a lot almost nonstop when dami was dick's robin. when they couldn't be batman&robin together anymore and stopped being together all the time, they'd both feel unsettled, like they were missing a part of themselves without being together. it would take adjustment but they know each other better than anyone and they carry their other half inside them anyway so eventually the physical distance just drives them closer together in a way because it forces them to confront their feelings more deeply and what they mean.

everyone third wheels when they hang out with Dd. and i agree that they'd both brag about how close they are and how they know each other better than anyone else!! saying things to others like "dick/dami wouldn't do that" (depending on whos talking) or "i know him better than you do" or laughing when someone says something about their other half which they know to be so untrue to the point they can't keep a straight face. they'd be arrogant about it too because they're annoying like that 🥰

i think they're both practical when it comes to house chores and would do a lot of them together, cooking cleaning etc. they do a lot of domestic stuff together and i don't think either of them care about details when it comes to that. the thing that matters to them is that they're together because it makes a boring chore more fun for them.

dami loves the shirts that dick gives him (even though they're kinda ugly) and the shirts/hoodies/sweaters he "steals" from dick's closet more than he loves his own clothes (which are beautiful) because they hold more meaning to him.

dick influences dami in some ways, some unintentional (like dami getting similar taste in music as dick mainly rock because he thinks his older brother is cool even if he wouldn't admit it) and some ways intentional like dick intentionally manipulating dami because he doesn't wanna lose him. they bring out the worst and best of each other. the best duo. two halves of a whole <3

(btw i'm sorry for the late reply 😭 tried to fit all my thoughts here, even leaving some stuff out lol, but i hope it makes sense)