Hand holding. It was such a weird thing, really. Tony had never really been interested in it before -- he liked having his hands free for -- using his phone. Or gesturing or... whatever else. But he liked holding Steve's hand. That was definitely a thing.
Apparently his description worked, or Steve liked it because then they were kissing and Tony liked that a hell of a lot too (of course) and he was up on his toes to give as good as he was getting for as long as possible. Definitely not platonic. Oh, they could be friends, but not in the same way he and Pepper were. Now that he had Steve, really had him, there was no going back.
"Maybe you should," he agreed and then shot Steve an amused glance. "Just so long as you're aware -- like everyone is -- that if you do something you don't like, she'll absolutely end you."