Sometimes Steve just wants to let go. Tony’s perfectly willing to help with that. The two of them try something Steve’s been wanting for a while. Basically PWP with added feelings. This is basically just porn. Lots and lots of light dom/sub dirty-talk fluffy bottom!Steve movieverse established relationship porn. (Includes rimming and some ass-to-mouth, though steps are taken to mitigate the grossness.) Here on AO3.
“You sure you wanna do this?” Tony asked for the fourth time just since they’d closed the bedroom door behind them. His hands felt very warm on Steve’s waist as he backed him up against the bed, slid them over his stomach to unbutton his pants and tug them down before he pushed Steve back onto the bed and swung his legs over Steve’s, straddling him. “I mean, there’s still time for you to change your mind, roll me over and pound me into the mattress. If you, y’know, you want to.” His tone was easy, bright with sharp irreverence, but there was something like concern in his eyes, softer and warmer than his voice.
Steve still felt himself blush, all the same. “Yes,” he said, as firmly as he could manage, and was glad his voice came out steady. “I’m sure.” But because Tony had asked four times—and more before that—he asked him, resting both hands on Tony’s waist, “Are you?”