No, it probably wasn't work. But Steve was the one doing it -- although, frankly, he probably didn't realize how much of an effort it was for Tony to lay still and relaxed, to not just try and rush into things because his cock was demanding attention and his brain was happy to take short cuts. Restraint had never been Tony's strong suit.
The kiss was - nice. But fleeting apparently, and Tony tensed, clenched down on Steve's fingers when his mouth went over his cock and then he exhaled, making something of a mournful noise when he kept on going.
Right up until he stopped anyway, and Steve was eager and his tongue was playful and wet and Tony jolted with the surprise of it. "Are you fucking kidding me?" He asked, but it came out breathless and his cock twitched about it in obvious interest. It was all Tony could really do, bending his knees a little more and spreading wider, one hand clawing at the sheets and the other moving to grip Steve's hair.