Tony reminds Steve of a secret weapon he gave to him and that only Steve knows about. And Steve…
…uses it to great effect.
Avengers vs X-Men #8
In the story Relics from Captain America V. 3 #50 Steve bounces the shield around his flat while he’s on the phone with Sharon and we get to see a present he received from Iron Man.
To Cap, I don’t know whhich head is harder — yours or this one! From Iron Man.
Presenting what they know in the White Hose like a well oiled machine - finishing each other’s sentences and understanding each other well.
Avengers vs X-Men #1
Steve: I don’t mean to make things difficult.
Tony: I know, because you’re a very polite person.
Steve: If I see a situation pointed south… I can’t ignore it. Sometimes I wish I could.
Tony: No, you don’t.
Steve: No, I don’t. Sometimes…
Tony: Sometimes I wanna punch you in your perfect teeth. But I don’t wanna see you gone. We need you, Cap.
Arguing and backhanded compliments, when emotions are ruing high in Captain America: Civil War (2016).
“No matter what. I promise you, if you need us, if you need me, I’ll be there.”
Steve sends Tony a letter, a phone and a promise at the end of Captain America: Civil War (2016).
Steve: I will miss you, Tony.
Tony: Yeah?
Steve tells Tony he’ll miss him and Tony sounds like he absolutely wants to beleive him.
Avengers: Age of Ultron (2015)
Tony: How were you guys planning on beating that?
Steve: Together.
Tony: We’ll lose.
Steve: Then we’ll do that together, too.-
Tony: Well, like the old man said. Together.
Learning to be on the same page at last.
Avengers: Age of Ultron (2015)
“Play nice, Tony.”
In an argument with Protector, Tony calls on Steve to back him up.
Avengers vs X-Men #1
Tony: I don’t trust a guy without a dark side. Call me old-fashioned.
Steve: Well, let’s just say you haven’t seen it yet.
Tension rises. Steve shows off - and Tony? You’re totally staring.
Avengers: Age of Ultron (2015)