Obviously that would be Tony. I mean, come on. Steve went to high school in the 1920s. He probably had an asthma attack while trying to do the charleston on a dare at the school dance.
So yea, definitely Tony. It was a short phase that he went through that Howard was definitely not happy about, and anyone who brings up a photo of him in his emo phase will find their bank accounts empty very quickly.
+ Steve would definitely want to find these photos. Can you imagine Tony’s face when Steve holds up this photo of him.