Have you read the new Ultimates #4 by Deniz Camp? It features Tony as a teenager when Cap is unfrozen! He calls Steve "the perfect man"! Howard is dead and Tony writes him a "The Reason You Suck Speech" that he keeps on his tablet! So much good material!
I think all the things you are talking about happened in issue 1, but, yes, I am current on Ultimates. I think so far the actual plot has a lot of really interesting expansions on various alt-history ideas -- making the usual Marvel storyline where the gamma bomb just leads to Hulk as instead being an explicit reference to Castle Bravo was not a thing I was expecting at all from this comic. It is unusually thoughtful about history, more so than I was expecting. Steve waking up in a world where America no longer exists is also a plot element with a lot of promise. I'm still not thrilled with Tony as Iron Lad, tbh, because The Crossing was scarring enough, but Tony's speech about Howard did really win me over.
(Also I don't think we know for sure if Howard is dead -- we know he's stuck in The City with The Maker and that he's presumed dead but I'm not calling it until they show me a body.)
I feel like we haven't seen a whole lot of Steve/Tony yet but the dynamic is interesting because Steve is definitely older and more experienced with... basically everything they're doing... and Tony is just brimming with ideas and enthusiasm and also hero-worship. So that's gonna be fun.
The other day I was looking to see if we had a canonical statement on how old this Tony is -- we don't, other than (I think) that he's a teenager, but in my head I have been assuming he is 19 like ye olde Teen Tony, that's about how old he looks, and also Steve unhesitatingly offers him a drink in the FCBD issue and I don't think Steve would do that if he didn't regard Tony as An Adult. (The drinking age Steve would have been familiar with was 18, although, I mean, he did, like, take Bucky to war, so I don't know how much he actually cares about anything like that.)
Anyway, while I was failing to find that out, I did find out that Deniz Camp is intentionally writing Tony as being on the autism spectrum, which I thought was pretty cool. Although it's not canon, because Marvel themselves hasn't said so, alas.
