They'd started out somewhere rocky and this place with all it's strange ups and downs didn't always make it easy either. But it'd been coming. Probably from the moment Tony'd agreed to live in Steve's (clean, comfortable, nothing to worry about) house instead of picking one out for himself. They'd just needed to work toward it.
The sex would probably have been good even if they didn't like each other. But it was all the better because they did. Because they both took the time to learn and to give as much as they gave.
And god, Steve had learned some pretty great tricks. Tony made a noise like the air was being punched out of him, fingers twisting up in the sheets as Steve curled his fingers just so. It was good he was on his knees, no friction to be found for his now too-hard cock, because he wanted to last this one out for as long as it'd go. "Jesus fucking --america," he said once he'd found his mind again, panting against the sheets. "They feel really good in me."