Tony starts calling Steve "boss," and Steve has all sorts of feelings about it. It ends up coming up in bed. The results open up some new areas in their sexual relationship, and maybe reveal a few things about Tony, and how he feels about Steve.
When Tony comes back from a very bad D/s date, in pain and abandoned by his dom, Steve offers to help Tony out and give him all the aftercare he so desperately needs.
Steve is moving into Tony's penthouse and insists they go through old boxes of Tony's things to find out what should stay and what should go to make room for Steve's things. But the boxes contain more than just old clothes and Christmas decorations, and it leads to a shocking discovery for Steve.
He let his hands rest, warmly, on Steve’s shoulders, against his neck. “I just want you to fuck me, soldier,” he managed to get out, breathy. “I want you to fuck me, yes, in my ass, and not stop. Again and again, until it’s out of your system.”
Steve and Tony and a marathon sex encounter. That's it, that's the fic.
Steve wakes up to the fact that no one ever compliments or even says thank you to Tony, and that he has fallen into the same trap of painting Tony with a specific paintbrush.
This is how he showers a very confused Tony with praise to make up for it.
Tony's a brat. It's just the truth. There's always that voice in his head that tells him to push, refuse, disobey. And that means no dom has the time or patience or skill to take him down into the subspace he craves.