𝐆𝐈𝐀𝐍𝐓 𝐆𝐈𝐑𝐋

even the comics themselves seem to have forgotten in the last ten years or so that scott and tony were actually very good friends. tony helped scott find work, and respected him as an engineer. they are close enough that cassie repeatedly calls tony "uncle" or "unca" tony. you don't just call anyone uncle. cassie canonically has really only called tony, hank, and i believe reed "uncle".

cassie doesn't hesitate to run up and hug tony. she calls him uncle. this implies that cassie has spent a significant amount of time around tony. there is also a comic (i don't remember which one because it's been YEARS, but i have a screenshot) where tony is publicly gravely injured and fighting for his life in the hospital, and cassie is in clear distress watching it on the news.

we also know that cassie spent quite a lot of time at avengers mansion, and lived there at least one weekend a month. so it would be safe to assume that cassie would become quite close with everyone there, tony included. i fully imagine cassie running around, curious about tony's work and learning science from him (considering they have made cassie become a scientist, i am fully running with hank, reed, and tony all having taught her a lot as a kid).

a huge moment, and my personal favorite, comes in the early issues of young avengers. when the (former) avengers find out that these new teen heroes have broken into avengers mansion, they arrive to find a giant sized cassie who has just discovered she has powers. as she goes inside to find her dad's suit, tony finally tells her the truth about her dad's death--that he was murdered and it wasn't an accident. and we get my favorite line. "i've already lost your dad. i don't want to lose you, too." that is not something you say to the daughter of someone who's just a work friend.

now, the comics have backtracked a little after this. cassie calling tony simply "mr. stark" or just "iron man". but there are still some sweet moments. like this little comic that is likely not canon, but i love it. in it, they're close enough that he let her borrow a car to go on a date.

tony was also there when cassie died. he got his friend back (scott), but lost cassie in the process. something he'd been worried about ever since cassi first decided to follow in her dad's footsteps. and so they build statues of her (and jonas) next to her dad's statue at avengers mansion.

here's where we get to the headcanon part of my post. cassie canonically had/has a heart condition in the comics, and i like to believe that tony personally made heart monitors, etc. for cassie to manage her condition. state of the art equipment to monitor her condition and make sure she's okay.